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ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

Paint finishes
Established on: October 21, 1977
Revised on: June 3, 2009

1. SCOPE
This standard covers paint finishes on the metal surfaces of automotive bodies and parts, for the purposes of
decoration and corrosion protection, except the following:
(1) Paint for special purposes, such as thermal resistance, acid resistance, soundproofing, inside surfaces of
lubricating system, etc.
(2) Paint on special parts, such as panel fitted surfaces and inside surfaces of box-shaped parts, where
finishing surface with paint is difficult
(3) Paint for the purpose of preventing corrosion between processes
(4) Paint on plated plastics

2. SPECIFYING METHOD
Paint coating specification in drawings or other documents shall show the performance code of paint coating,
appearance grade and tone of color.
(1) Quality of paint coating shall be in accordance with ISC-B51-001Y.
(2) Tone of color of paint finishes shall be black.

Column of surface finish code :

A 336 A
Paint class:
A: Paint film for body and body parts
B: Paint film for engine and chassis parts

Test time of durability performance of paint film(mainly salt spray test)

Code of appearance grade(4 grades : A~D)

If required, paint coating specification in drawings or other documents may show codes of additional
performance, process code, material and notes. For the details of the specifying method, ISC-B50-001Y
‘General rules for paint finish’ shall be referred to.

Example of additional performance codes

Example: B 336D - W
Additional performance code(see Table 1)

Table 1 Additional Performace(quated from ISC-B50-001A “General rules for paint finish” )
Code Additional Performance Application
A××× B×××
A1 Alkali Resistance * ○
A2 Acid Resistance * ○
B Brake Fluid Resistance ○ ○
C Chipping Resistance ○ ○
E1 Erichsen Value ○ ○
E2 Engine Oil Resistance - ○
G1 Gasoline Resistance ○ ○
G2 Gear Oil Resistance - ○
H Heat Resistance ○ ○
I Impact Resistance * ○
K Light Oil Resistance ○ ○
R Anti-Freeze Resistance ○ ○
S Thermo-Cycle Resistance ○ ○
W Weather Resistance * ○
W2 Ultraviolet Transmission Ratio *(Except trim parts) -
Remark Asterisked(* ) performance is required for basic performance in paint class A.

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

2.1 Type and the Performance Code of Paint Coating

Products fall in the following two categories, and in the categories as shown in Attached Tables 1~4 for
coating performance:

Table 2 Paint Coating Type

Categories The Performance Code of Paint Coating
Body and Body Parts A×××
Engine and Chassis Parts B×××

2.2 Appearance Grade(Class)

Appearance grades fall in 4 categories shown in Table 3.

3. QUALITY OF PAINT COATING

Paint coating on the final products shall meet the following quality requirements: However,
Quality requirements of coating thickness and pencil scratch value shall be met when Isuzu receives
products from suppliers including Isuzu partner manufacturing industry in Japan and overseas countries.
If assembling of products has already complied when Isuzu receives them, they shall meet quality
requirements of coating thickness and pencil scratch value before assembling of products in suppliers.

3.1 Performance of Paint Coating

Paint coating shall meet the basic and additional performance requirements shown in Attached Tables 1~4
respectively. Basic performance requirements are common to all products, and additional performance
requirements are selected for each product. If any, such instructions shown in drawings as change / deletion /
addition of performance requirements shall be followed.

3.2 Appearance
Paint coating in each grade shall meet the requirements for appearance specified in Table 3. If required, limit
samples mutually agreed between responsible Isuzu Department (1) and a supplier shall be referred to.
Notes(1) Isuzu Quality Control Department

Table 3 Appearance Grade

Grade
Class A Class B Class C Class D(5)
Condition
Almost
Surface Smooth -- --
Smooth
Not so many
Almost Free from
Color/Gloss Uniform remarkable
Uniform noticeable mottle
mottles
Function Defects
Free from functional defects
of Coating (2)
Not so many
Surface Defects of Free from Free from
Free from remarkable
Coating (3) defects which remarkable defects
noticeable defects
can be readily
Base Metal defects Not so many
found --
Surface Defects (4) remarkable defects
Good Good - Engine & chassis - Body parts
appearance is appearance is parts requiring not requiring
required: required: good appearance good
- RV body - RV body - Body parts appearance
(Reference)
exterior interior (luggage & engine - Underbody
Applications
- RV exterior - Truck compartment) & - Door inner
parts etc. in/exterior in/exterior parts not - General
- In/exterior requiring good engine &
Parts etc. appearance) chassis parts
2
Notes( ) ‘Function Defects of Coating ’ mean defects harmful to product value and corrosion
protection, such as bare metal (without coating), thin paint, cracks, scratches, peeling,
creases, wrinkles, blisters, etc.
(3) ‘Surface Defects of Coating ’ mean defects, mainly harmful to product value, such as sag, run,
orange peel, putty marks, inclusion of dust, dirt and foreign matters, pinholes, crawling,
bubbles, blisters, metal blooming,

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

(4) ‘Base Metal Surface Defects’ mean defects, mainly harmful to product value, such as file
marks, buff cuts, welding/soldering marks, dents, soldering porosity, waviness, scores,
spatter, etc.
(5) Where instruction in the drawing specifies Class E, items for Class D shall apply.

3.3 Tone of Color

Color scheme issued by Isuzu Design Center shall be referred to for the tone of color. Unless otherwise
specified, color shall be black (6). Limit samples mutually agreed by responsible Isuzu department (7) and
a supplier shall be referred to.

Notes(6) Glossy black unless otherwise specified.

(7) Isuzu Quality Control Department

4. PROCESS
Paint coating processes shall be selected so that the quality requirements shown in Clause 3 herein may be
met. However, it is preferable to select process cord in Attached Table 5, to select methods of paint coating in
Attached Table 5, and to indicate them.

5. MATERIAL
Paint shall be selected so that the requirements specified in QUALITY OF PAINT FILM of Clause 3 herein may
be met, unless otherwise specified. However, it is preferable to select paint resins in Reference 3 and to
indicate them.

6. TEST METHOD
For the method for testing paint coatings, ISC-E00-006Y ‘Test methods for paint finish’ shall be referred to.
Unless otherwise specified, a test sample shall be taken from the product itself or from the one taken from the
product. However where the product is not available for the test, the test sample of the same metal material,
same paint and was coated and baked under the same condition as the product is acceptable for the test.
Note: Particular attention is required for following items since in many cases test samples do not correctly
represent the tested products in terms of these attributes:
Type of material (forged surface, cast, plated, etc)and thickness, with or without chemical conversion
treatment, type of baking furnace (gas furnace and electric furnace)

7. OBJECTION TO THIS SPECIFICATION AND REQUEST FOR REVISION

(1) If any doubt is raised about the interpretation of this standard, Materials Development Sec. No. 2, Vehicle
Validation & Experiment Dept. shall be contacted, and shall make a decision.
(2) If any revision is required, Engineering Information Group, Engineering Planning Dept.
shall be informed of the details of the revision and the reasons. If necessary, Engineering Information
Group, Engineering Planning Dept. shall discuss the necessity with related departments, and shall take
appropriate actions.

8. OTHERS
(1) This standard shall become effective on June 15 , 2009.
(2) This standard shall supersede ISC-B51-001B Paint finishes revised on April 21, 2000.

Related standards:

ISA-H-007Y Establishment of color numbers

ISC-B50-001Y General rules for paint finish
ISC-E00-006Y Test methods for paint finishes
ITD-004951 Threaded fastener tightening designing standard(For in-house)
ITD-004952 Bolt & nut tightening handbook(For in-house)
ISC-B51-003Y Performance of coating on exterior plastic parts
ISC-B51-004Y Performance of coating on interior plastic parts
ISC-F22-020Y Test procedures for basic performance of interior and exterior plastic parts

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[ Highlights of June 3, 2009 Revision ]

(1) 2. Specifying Method: The example of additional performance codes is added. The purpose is to make
the meaning of additional performance easier to understand and at the same time to improve drawing
quality through the clarification of the specifying method.
(2) 3.2 Appearance Grade: Class E is integrated into Class D since these two share same required
performance and inspection criteria.
(3) 6.Test Method: Description on a test sample is added.
(4) 5.Related Standards: GM4350 is deleted as it is not referred to in the text.
(5) Gloss in the Attached Table 1 and 2 and Weatherability in the Attached Table 1: Since expression of
1C 1B and 2C 1B are used only for body paint, they are changed to “Unless otherwise specified” and
“Clear coat”.
(6) Erichsen Value in the Attached Tables 1 and 2: Transferred from basic performance to additional
performance. Erichsen Value is a necessary test for parts that are machined after painted. Since it is not
necessary to apply it to all parts, it is reclassified into additional performance.
(7) Corrosion Protection in the Attached Tables 1 and 3: Only combination corrosion protection will be used
for A480 and B480 and above because galvanized parts do not reproduce their deterioration in the field.
(8) Combination Corrosion Protection in the Attached Tables 1 and 3: ISC cycle condition is changed to
JASO M609 in order to shorten testing time and to minimize variations related to human factors.
(9) Color Difference and Test Method for Weatherability in the Attached Tables 1 through 4: For the sake of
unification with other ISC-Material, 3NBS is changed to E*=3. The test method is changed to
the standard that correlates to international standards. With this, for interior surface and parts, UV carbon
weatherometer, currently not in use, is abolished. The same applies to the test method for exterior
surface and parts.
(10) Peeling Resistance according to Compound-Cycle & Weather test (WOC): Abolished. Instead, adopt UV
transmission ratio that is specified as test item under the ISC-Material for body top coat.
(11) “Interior Parts “in the title of Attached Table 2 and in the Application: Deleted. This enables the table’s
application to exterior parts.
(12) Electric Deposition One Coating for Coating Thickness in the Attached Tables 3 and 4: Since it was
confirmed that tightening torque does not drop until ED one coating of 40µm, (R&D Report 2008-4622),
25µm or less is changed to 40µm or less.
(13) Gloss in the Attached Tables 3 and 4: 60 or over is changed to 50 or over because there is practically no
problem with this.
(14) Pencil Scratch for ED One Coating in the Attached Tables 3 and 4: H or over is changed to 2H or over in
line with capability of ED coating.
(15) Gloss Remaining Ratio Test Method for Wetherability in the Attached Tables 3 and 4: When the coating
test sample except for body color is taken from the testing machine and measured for gloss, if it is
washed, data does not stabilize (due to impact of chalking). Thus, “measurement after water wash” is
changed to “without water wash.”
(16) Duration for Weatherability in the Attached Tables 3 and 4: Changed from 150 hours to 200 hours.
(17) Corrosion Protection Test Method in the Attached Table 4: To improve evaluation accuracy,
Method B(without scribed lines) is changed to Method A (with scribed lines) same as Attached Tables 1
through 3. However, in case of parts with uneven surface such as cast or with weld sputter on the surface,
Method B is to apply as before due to difficulty to apply Method A (with scribed lines) for evaluation.

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Attached Table 1 Paint Coating Performance (Vehicle Body and Body Parts)
Test Methods
Coating Performance Codes & Standards
Items (ISC-E00-006Y)
A1000 A800 A600 A480 A336 A240 Items Conditions
Set the most suitable values agreed between
responsible Isuzu dept. and suppliers for every
Coating Thickness drawing indication or part according to 4.1
appearance grade, coating performance, paint
quality, etc.
Unless otherwise specified: ≥85,
Gloss (1) 4.3 (60° Method)
With clear coat: ≥90 in general
Pencil Scratch Min. F(tear),unless otherwise specified 4.4
Total thickness
≤50µm; Method
‘A’, 1mm grid
Adhesiveness Coating remaining area ratio ≥ 95% 4.6 Total thickness ≥
50µm; Method ‘A’,
2mm grid
Higher standards than those shown here are separately shown.

Multiple-layer coating (2); ≥20 cm,

Impact Resistance 4.7 500 gram weight
Single-layer coating (3); ≥30 cm
Free from noticeable blisters, peeling, corrosion. Method ‘B’
Humidity Performance
Coating remaining area ratio ≥ 95% 4.10 (≥98%RH,
Resistance
Duration(hrs) 240 49±1˚C)
Scribed lines; Corrosion/blister width≤3 mm on Method ‘A’
each side *For galvanized
Corrosion Performance
Other areas; Free from blisters, corrosion area 4.11
Basic Performance

parts, this test is

Protection not necessary for
≤0.1%
Duration(hrs) 1,000 800 600 480 336 240 A480 and above.
Scribed lines; Corrosion/blister width≤3 mm on
Combinatio each side
Performance
n Other areas; Free from blisters, corrosion area
4.24 Method ‘E’
Corrosion ≤0.1%
Protection Same as
No. of Cycles 90 72 54 42
above
Alkali Resistance Free from blisters, peeling. Slight change in color 4.12 Method ‘B’
Acid Resistance and gloss and slight softening permissible. 4.13 Method ‘B’
Free from remarkable cracks, blisters, peeling. Exterior surfaces
Coating remaining area ratio≥70%, Gloss & parts;
Performance Method ‘A’
remaining ratio ≥70%, Color difference E*≤ 3
(ISC-F20-013(A) )
Weather- and shall not be visually obvious ,‘C’ISC-F20-012)
4.14
ability Exterior surface and parts Method ‘A’: 400, 2000 Interior surfaces &
parts;
Duration(hrs)
(With clear coat)
Method ‘A’
Method ‘C’: 3000(With clear coat) (ISC-F20-013(B) )
Interior surface and parts Method A : 200

ISC-C61-009 6.16
Yet, calculate
Apply to multiple-layer coating for exterior parts: transmission ratio
UV Transmission Ratio 360~420nm 6.16 for minimum
UV Transmission ratio ≤ 0.01% coating thickness
of the top coat on
parts.

( Continued on the following page )

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

Multi-layer coating(2): ≥ 2mm,

Erichsen Value E1 4.8
Single-layer coating(3): ≥ 3mm

Free from cracks, blisters, peeling. (150±3˚C×3

Heat Resistance H 4.15
Slight change in color & gloss permissible. hrs)

10 cycles
Thermal Cycle (98%RH,49˚C×
Free from cracks, peeling, shrinkage.
S 4.16 16 hrs→
Additional Performance

Resistance Coating remaining area ratio≥90%

-30˚C×3 hrs→
80˚C×3 hrs)
Kerosene (20±5˚C×24
K 4.17
Resistance Free from blisters, peeling. Slight change in color & hrs)
Anti-Freeze Coolant gloss, and slight softening permissible. (50%,
R 4.18
Resistance 50±2˚C×24 hrs)
Gasoline Resistance Method ‘A’
Free from blisters, peeling. Slight change in color &
G1 4.19 (20±5˚C×24
gloss, and slight softening permissible.
hrs)
Brake Fluid (20±5˚C×24
B Free from dissolution. 4.22
Resistance hrs)
Chipping Resistance (Flying pebble
C1 ≥ Grade 5 4.23 test ×1 time,
-20˚C)
Corrosion Streaks
F Length of corrosion streaks ≤3 mm 4.25
Resistance
RV To be applied
Body Trucks, Vans, generally
Buses
(Reference) Application

To be applied if so
Equiv to Body specified
Ex-te
Outer Panels In equiv. of exterior
rior
Moderately parts,
Parts
Anticorrosive Moderate Anticorrosion:
,
Lightly To be applied for
Equiv.
Anticorrosive portions watered easily
In-ter Moderately Light Anticorrosion: To be
ior Anticorrosive applied for portions not
Parts watered easily
Slightly
Anticorrosive
Notes (1) This item shall not apply to primer coating.
(2) ‘Multiple-layer coating’ means coatings finished by applying paint twice or more.
(3) ‘Single-layer coating’ means coatings finished by applying paint once, such as primer surfacer,
chassis black, etc.; Application of etching primer is not counted.
(4) Paint material shall be carefully selected because some paints do not meet this requirement.

Remarks: Tests for -marked items can be saved if coating quality is assured by paint material and drying
conditions. -marked items shall not apply to primer coating.

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Attached Table 2 Paint Coating Performance (Interior Parts)

Test Methods
Coating Performance Codes & Standards
Items (ISC-E00-006Y)
A168 A96 A48 A0 Items Conditions
Set the most suitable values agreed between
responsible Isuzu dept. and suppliers for every
Coating Thickness drawing indication or part according to 4.1
appearance grade, coating performance, paint
quality, etc.
Gloss (1) Unless otherwise specified: ≥85, 4.3 (60° Method)
Pencil Scratch Min. F(tear),unless otherwise specified 4.4
Total thickness
≤50µm; Method
‘A’, 1mm grid
Adhesiveness Coating remaining area ratio ≥ 95% 4.6
Total thickness ≥
50µm; Method
‘A’, 2mm grid
Multiple-layer coating (2); ≥20 cm,
Impact Resistance 4.7 500 gram weight
Single-layer coating (3); ≥30 cm
Free from noticeable
(Same as Humidity blisters. Coating remaining
Water Resistance 4.9 (20±5˚C×24 hrs)
Resistance) area ratio
Basic Performance

≥95%
Free from noticeable Method ‘B’
blisters, peeling, (≥98%RH,
(Same as Water
Humidity Performance corrosion. Coating 4.10 49±1˚C)
Resistance)
Resistance remaining area ratio
≥ 95%
Duration(hrs) 168 96 --
Scribed lines; Corrosion/blister width≤3 mm on
each side
Corrosion Performance
Other areas; Free from blisters, corrosion area 4.11 Method ‘A’
Protection
≤0.1%
Duration(hrs) 168 96 48 0
Alkali Resistance Free from blisters, peeling. Slight change in color 4.12 Method ‘B’
Acid Resistance and gloss and slight softening permissible. 4.13 Method ‘B’
Free from remarkable cracks, blisters, peeling. Exterior surface
Performance

Coating remaining area ratio≥70%, Gloss remaining and parts: Method

ratio ≥70%, Color difference E*≤ 3 and shall not be ‘A’ ISC-F20-013(A)
visually obvious. Interior surface and
Exterior surface and parts: 400, parts: Method ‘A’
Weatherability Interior surface and parts: 200 4.14 ISC-F20-013(B)
Duration(hrs)

( Continued on the following page )

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Multi-layer coating(2): ≥ 2mm,

Erichsen Value E1 4.8
Single-layer coating(3): ≥ 3mm
Free from cracks, blisters, peeling.
Heat Resistance H 4.15 (150±3˚C×3 hrs)
Change in color & gloss shall not be remarkable.
Additional Performance

10 cycles
Thermal Cycle (95%RH,49˚C×1
Free from cracks, peeling, shrinkage.
S 4.16 6 hrs→ -30˚C×3
Resistance Coating remaining area ratio≥90%
hrs→ 80˚C×3
hrs)
Kerosene
K 4.17 (20±5˚C×24 hrs)
Resistance
Anti-Freeze
Coolant Free from blisters, peeling. Change in color & gloss, (50%,
R 4.18
and softening shall not be remarkable. 50±2˚C×24 hrs)
Resistance
Gasoline Method
G1 4.19 ‘A’(20±5˚C×24
Resistance
hrs)
Brake Fluid
B Free from dissolution. 4.22 (20±5˚C×24 hrs)
Resistance (4)
Chipping (Flying pebble
C1 ≥ Grade 5 4.23 test ×1 time,
Resistance
-20˚C)
Corrosion Streaks
F Length of corrosion streaks ≤3 mm 4.25
Resistance
Moderately Anticorrosive
To be applied
Application

generally
Slightly Anticorrosive
To be applied if so
specified
Not Anticorrosive
Notes (1) This item shall not apply to primer coating.
(2) ‘Multiple-layer coating’ means coatings finished by applying paint twice or more.
(3) ‘Single-layer coating’ means coatings finished by applying paint once, such as primer surfacer,
chassis black, etc.; Application of etching primer is not counted.
(4) Paint material shall be carefully selected because some paints do not meet this requirement.

Remarks: Tests for -marked items can be saved if coating quality is assured by paint material and drying
conditions. -marked items shall not apply to primer coating.

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Attached Table 3 Paint Coating Performance (Engine and Chassis Parts1)

Test Methods
Coating Performance Codes & Standards
Items (ISC-E00-006Y)
B1000 B800 B600 B480 B336 B240 Items Conditions
Electric deposition one coating :≤ 40µm
Coating Thickness Baking hardening type coating : ≤ 60µm 4.1

Higher standards than those shown here are separately specified.

Others : ≤ 40µm, unless otherwise specified
Gloss (1) ≥ 50 in general 4.3 (60° Method)
Electric deposition one coating :≥ 2H
Baking hardening type coating : ≥ F
Pencil Scratch Others : ≥ 2B, unless otherwise specified 4.4
For their coatings, pencil scratch shall be values
of coating tear.
Baked coating;
Method ‘A’,
Basic Performance

1mm grid
Adhesiveness Coating remaining area ratio ≥ 90% 4.6 Air-dried
coating; Method
‘A’, 2mm grid or
Method ‘B’
Corrosion area; Class A and B≤0.1%,
Class C≤1%, Class D ≤10% Method ‘B’
Humidity Performance
Free from noticeable blisters, 4.10 (≥95%RH,
Resistance
Coating remaining area ratio ≥ 90% 49±1˚C)
Duration(hrs) 240
Scribed lines; Corrosion/blister width≤3 mm on Method ‘A’
each side *This test is not
Corrosion
Performance Other areas; Corrosion area ≤0.1% (Class A and necessary
B), ≤1% 4.11 forA480 or
Protection
(Class C), ≤10% (Class D ) above for
galvanized
Duration(hrs) 1,000 800 600 480 336 240 parts.
2
Multiple-layer coating ( ); ≥20 cm, 300 gram
Impact Resistance I 4.7
Single-layer coating (3); ≥30 cm weight
Multiple-layer coating; ≥2 mm,
Erichsen Value E1 4.8
Single-layer coating; ≥3 mm
Alkali Resistance A1 Free from blisters, peeling. Slight change in color and 4.12 Method ‘A’
Acid Resistance A2 gloss and slight softening permissible. 4.13 Method ‘A’
Free from cracks, blisters, peeling. Coating remaining Exterior surface
Additional Performance

area ratio ≥ 70%, Gloss remaining ratio ≥ 70%(Coating and parts:

samples except for body color shall be measured Method ‘A’
without water wash), Color difference E*≤ 3 and ISC-F20-013(A,2
Weatherability W shall not be visually obvious. 4.14 00)
Interior surface
and parts:
Method ‘A’
ISC-F20-013(B,2
00)
Free from cracks, blisters, peeling. (150±3˚C×3
Heat Resistance H 4.15
Change in color & gloss shall not be remarkable. hrs)
10 cycles
(95%RH,49˚C×
Thermal Cycle Free from cracks, peeling, shrinkage.
S 4.16 16 hrs→
Resistance Coating remaining area ratio≥80%
-30˚C×3 hrs→
80˚C×3 hrs)
( Continued on the following page )

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Kerosene (20±5˚C×24
K 4.17
Resistance hrs)
Anti-Freeze
(50%,
Coolant R 4.18
50±2˚C×24 hrs)
Resistance
Free from blisters, peeling. Change in color & gloss,
Gasoline (20±5˚C×24
G1 and softening shall not be remarkable. 4.19
Resistance hrs)
Gear Oil (50±2˚C×24
G2 4.20
Resistance hrs)
Engine Oil (50±2˚C×24
E2 4.21
Resistance hrs)
Brake Fluid (20±5˚C×24
Additional Performance

B Free from dissolution. 4.22

Resistance (4) hrs)
(Flying pebble
Chipping
C1 ≥ Grade 5 4.23 test ×1 time,
Resistance
-20˚C)
Per Scribed lines; Corrosion/blister width≤3 mm on each
for side
Combination m Other areas; Free from blisters, corrosion area ≤0.1%
Corrosion No. 4.24 Method ‘E’
Protection C2 Same as
of
90 72 54 42 Corrosion
Cyc
Resistance
les
Corrosion Streaks
F Length of corrosion streaks ≤3 mm 4.25
Resistance
Thin Metal Parts
Anticor
-rosive
Highly

(≤3.2)
(Reference) Application

Thick Metal Parts

Thin Metal Parts

Moderately
Anticor-ros

(≤3.2) To be applied
ive

generally
Thick Metal Parts To be applied if so
specified
Thin Metal Parts
Anicor-rosive

(≤3.2)
Slightly

Thick Metal Parts

Forging &
Casting
Notes (1) This item shall not apply to primer coating.
(2) ‘Multiple-layer coating’ means coatings finished by applying paint twice or more.
(3) ‘Single-layer coating’ means coatings finished by applying paint once, such as primer surfacer,
chassis black, etc.; Application of etching primer is not counted.
(4) Paint material shall be carefully selected because some paints do not meet this requirement.

Remarks: Additional performance items can be saved if coating quality is assured by paint material and drying
conditions. Additional performance shall not apply to primer coating.

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Attached Table 4 Paint Coating Performance (Engine and Chassis Parts2)

Test Methods
Coating Performance Codes & Standards
Items (ISC-E00-006Y)
B168 B120 B96 B72 B48 B24 B0 Items Conditions
Electric deposition one coating :≤ 40µm
Coating Thickness Baking hardening type coating : ≤ 60µm 4.1
Others : ≤ 40µm, unless otherwise specified
Gloss (1) ≥ 50 in general 4.3 (60° Method)
Electric deposition one coating :≥ H
Baking hardening type coating : ≥ F
Pencil Scratch Others : ≥ 2B, unless otherwise specified 4.4
For their coatings, pencil scratch shall be values of
coating tear.
Baked coating;
Method ‘A’,
1mm grid
Adhesiveness Coating remaining area ratio≥90% 4.6 Air-dried
coating; Method
‘A’, 2mm grid or
Method ‘B’
Basic Performance

Free from noticeable blisters.

(Same as Humidity (20±5˚C×24
Water Resistance Coating remaining area ratio 4.9
Resistance) hrs)
≥90%
Corrosion area;
Class A and
B≤0.1%,
Class C≤1%,
Method ‘B’
Humidity Performance Class D ≤10% (Same as Water Resistance)
4.10 (≥95%RH,
Resistance Free from noticeable
49±1˚C)
blisters,
Coating remaining
area ratio ≥ 90%
Duration(hrs) 168 120 96 --
Scribed lines: Corrosion/blisder width ≦ 3mm Method ‘A’
on each side. Parts with uneven
Performance Other areas: Corrosion area ≤0.1% (Class A -- surface such as
cast parts or with
and B), ≤1% (Class C), ≤10% (Class D)
Corrosion weld sputter on its
Free from noticeable blisters for B96 or more. 4.11 surface and thus
Protection
for which Method
‘A’ is difficult to
Duration(hrs) 168 120 96 72 48 24 -- apply for its
evaluation:
Method ‘B’
Multiple-layer coating (2); ≥20 cm, 300 gram
Impact Resistance I 4.7
Single-layer coating (3); ≥30 cm weight
Multiple-layer coating; ≥2 mm,
Erichsen Value E1 4.8
Single-layer coating; ≥3 mm
Alkali Resistance A1 Free from blisters, peeling. Slight change in color and 4.12 Method ‘A’
Acid Resistance A2 gloss and slight softening permissible. 4.13 Method ‘A’
( Continued on the following page )

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

Free from cracks, blisters, peeling. Coating remaining Exterior surface

area ratio≥70%, Gloss remaining ratio ≥70%(Coating and parts:
samples except for body color shall be measured Method ‘A’
without water wash), Color difference E*≤ 3 and ISC-F20-013(A,2
Weatherability W shall not be visually obvious. 4.14 00)
Interior surface
and parts:
Method ‘A’
ISC-F20-013(B,2
00)
Free from cracks, blisters, peeling.
Heat Resistance H 4.15 (150±3˚C×3 hrs)
Change in color & gloss shall not be remarkable.
10 cycles
Thermal Cycle Free from cracks, peeling, shrinkage. (95%RH,49˚C×16
S 4.16
Resistance Coating remaining area ratio≥80% hrs→-30˚C×3
hrs→ 80˚C×3 hrs)
Kerosene
K 4.17 (20±5˚C×24 hrs)
Resistance
Anti-Freeze
(50%, 50±2˚C×24
Coolant R 4.18 hrs)
Resistance
Free from blisters, peeling. Change in color & gloss,
Gasoline
G1 and softening shall not be remarkable. 4.19 (20±5˚C×24 hrs)
Resistance
Gear Oil
G2 4.20 (50±2˚C×24 hrs)
Resistance
Engine Oil
E2 4.21 (50±2˚C×24 hrs)
Resistance
Brake Fluid
Additional Performance

B Free from dissolution. 4.22 (20±5˚C×24 hrs)

Resistance (4)
Chipping
C1 ≥ Grade 5 4.23
Resistance (Flying pebble
Combination Perfor test ×1 time,
m (Same as Corrosion Protection)
Corrosion 4.24 -20˚C)
No. of
Protection C2 Cycles ----
Corrosion Streaks
F Length of corrosion streaks ≤3 mm 4.25
Resistance
Thin Metal Parts
Anticor-
Highly

rosive

(≤3.2)
Thick Metal Parts
(Reference) Application

Thin Metal Parts

Moderately
Anticor-ros

(≤3.2)
ive

To be applied
Thick Metal Parts generally
To be applied if so
Thin Metal Parts specified
(≤3.2)
Anicor-rosive

Thick Metal Parts

Slightly

Forging &
Casting
Rubber Baked
Parts
Notes (1) This item shall not apply to primer coating.
(2) ‘Multiple-layer coating’ means coatings finished by applying paint twice or more.
(3) ‘Single-layer coating’ means coatings finished by applying paint once, such as primer surfacer,
chassis black, etc.; Application of etching primer is not counted.
(4) Paint material shall be carefully selected because some paints do not meet this requirement.

Remarks: Tests for additional performance can be saved if coating quality is assured by paint material and
drying conditions. Additional performance items shall not apply to primer coating.

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

Attached Table 5 Paint Coating Processes

(Paint coating process shown in the table below shall be specified by drawing.)

Ref (6)
Major Process Name
Thick. P1 P2 P3 P4 P5 P6 P7 P8
(5)
µm
Grease/Rust Removal --
Phosphating --
Etching Primer 10
ED Primer 20
ED Black 20
Primer 20
Surfacer 20
Primer Surfacer 25
Intermediate Sealer 30
Top Enamel 30 (40) (20)
2nd Top Enamel 30
Top Clear 30
Chassis Black 20~30
Total Thickness (6) µm 90 100 50 55 65 50 70 60
Equivalent Appearance
A B A B
Class (7)
Reference

Anticorrosion (8) Baking 336~1,000

(Salt Spray Air
Time) Drying
--- 168
9
Applications ( ) Automotive Body Exterior Surface & Similar Parts

Ref (6)
Major Process Name
Thick. P9 P10 P11 P12 P13 P14 P15 P16
(5)
µm
Grease/Rust Removal --
Phosphating --
Etching Primer 10
ED Primer 20
ED Black 20
Primer 20
Surfacer 20
Primer Surfacer 25
Intermediate Sealer 30
Top Enamel 30
2nd Top Enamel 30
Top Clear 30
Chassis Black 20~30
Total Thickness (6) µm 80 80 80 100 85 80 110 95
Equivalent Appearance
A A
Class (7)
Reference

336~
Anticorrosion (8) Baking 336~1,000
1,000
(Salt Spray
Air
Time) 168 --- 168
Drying
9
Applications ( ) Automotive Body Exterior Surface & Similar Parts

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

Ref (6)
Major Process Name
Thick P17 P18 P19 P20 P21 P22 P23 P24
(5)
µm
Grease/Rust Removal --
Phosphating --
Etching Primer 10
ED Primer 20
ED Black 20
Primer 20
Surfacer 20
Primer Surfacer 25
Intermediate Sealer 30
Top Enamel 30
2nd Top Enamel 30
Top Clear 30
Chassis Black 20~30
Total Thickness (6) µm 30 40 30 20 20 25 30 35
Equivalent Appearance
C D
Class (7)
Reference

240~
Anticorrosion (8) Baking 168 96 240
1,000
(Salt Spray
Air
Time) 96 72 --- 168 120
Drying
Reverse Side of Body,
Body In/Exterior Parts
Applications (9) Underfloor
Moldings, Marks
Reverse Side of Exterior Parts

Ref (6)
Major Process Name
Thick P25 P26 P27 P28 P29 P30 P31 P32
(5)
µm
Grease/Rust Removal --
Phosphating --
Etching Primer 10
ED Primer 20
ED Black 20
Primer 20
Surfacer 20 or or
Primer Surfacer 25
Intermediate Sealer 30
Top Enamel 30
2nd Top Enamel 30
Top Clear 30
Chassis Black 20~30
Total Thickness (6) µm 20 25 30 30 20~30 50 40~50 30
Equivalent Appearance
D C D
Class (7)
Anticorrosion (8) Baking 120 96 168
(Salt Spray Air
Reference

Time) Drying
72 72 120
Forged/Cast
Anticor Parts for
Reverse Side of -rosion Chassis & General Thin Sheet
of
Applications (9) Body Interior Engine
Engine, Thick Parts for Chassis &
Parts Compl Sheet Parts, Engine
etes Rubber Baked
Parts

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

Ref (6)
Major Process Name
Thick. P33 P34 P35 P36 P37 P38 P39 P40
(5)
µm
Grease/Rust Removal --
Phosphating --
Etching Primer 10
ED Primer 20
ED Black 20
Primer 20
Surfacer 20 or
Primer Surfacer 25
Intermediate Sealer 30
Top Enamel 30
2nd Top Enamel 30
Top Clear 30
Chassis Black 20~30
Total Thickness (6) µm 20~30 60~70 40~50 55~65 60 20 40~50 20
Equivalent Appearance
D B C D C D
Class (7)
Anticorrosion (8) Baking 168 240 168 240~1,000
Reference

(Salt Spray Air

Time) Drying
120 168 ---
General
Thin
Sheet Anticorrosive Parts for Body, Thick Sheet Parts for
Applications (9) Parts for Chassis and Engine Chassis (ED Paint)
Chassis &
Engine

Ref (6)
Major Process Name
Thick. P41 P42 P43 P44 P45 P46 P47 P48
(5)
µm
Grease/Rust Removal --
Phosphating --
Etching Primer 10
ED Primer 20
ED Black 20
Primer 20
Surfacer 20
Primer Surfacer 25
Intermediate Sealer 30
Top Enamel 30
2nd Top Enamel 30
Top Clear 30
Chassis Black 20~30
Total Thickness (6) µm 50 50 50 40 30~40 60 70 60
Equivalent Appearance
B C D A B
Class (7)
Anticorrosion (8) 240~
Baking 336~1,000 168 120 168
Reference

1,000
(Salt Spray
Air
Time) Drying
--- 120 96 120
Thin Sheet Parts
for Chassis and
Thick Sheet Parts for
Applications (9) Engine Moldings, Marks
Chassis (ED Paint) (Zinc-Plated
Sheets)

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 ISUZU ENGINEERING STANDARD - MATERIAL ISC-B51-001C

Notes (5) Names of representative processes or paint materials are shown here. For the coating to meet the
quality requirements, paint shall meet the material standard specifications. Also, such minor
processes as removing forged/cast surfaces, rinsing, drying, baking, polishing, cleaning, wiping
and puttying, that are not shown here, shall be used if necessary.
(6) General thicknesses are shown here just for reference. Optimum thicknesses shall be determined
considering performance requirements, appearance class, coating material to use, etc.
(7) Appearance levels are shown here for coatings generally obtained by the respective processes
herein.
(8) Maximum test duration is shown here at which the corrosion/blister on one side of the scribed line
becomes 3 mm wide when tested per ISC-E00-006Y, 4.11 Method ‘A’ using SPCC as a base
metal.
(9) Guidelines for selecting processes are shown here. Such factors as vehicle structure, base
material thickness and surface conditions, mounting position, vehicle use conditions, etc. in
selecting processes.

Remarks 1. Phosphating process can be saved if phosphated zinc-plated sheet steels are used.
Etching primer shall be applied before oil-base paint is applied to plated steels.
2. If phosphating a body structural part is impossible, etching primer shall be used instead.
In the case of using a hot-rolled sheet metal, as-rolled surface shall be removed by such method
as acid pickling and sand blasting.

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