ENGINEERING MATERIAL SPECIFICATION
PERFORMANCE, ACOUSTICAL AND INSULATORS, INTERIOR ASSEMBLIES WSS-M99P32-E1
1. SCOPE
This specification defines the minimum durability requirements of all interior, luggage compartment, and
climate control sound absorption/insulation applications, where various materials are combined to provide
an assembly having acoustical sound absorption/barrier/insulation and/or functional features. This does
not include engine (hood) compartment insulators, thermal insulators, and/or exhaust shields. In addition,
ultra-high temperature parts exposed to heat from turbochargers, EGR systems, exhaust pipes, fender
stuffers and quarter wheelhouse insulators are not included.
2. APPLICATION
This specification was released originally for materials used as interior, luggage compartment, or climate
control for sound absorption/insulation applications.
The following components are not in the scope of this performance specification
• Acoustic wheel arch/well liners: WSS-M99P32-E2/E3 (or latest)
• Acoustical underbody/engine shields: WSS-M99P32-E4/E5 (or latest)
• Engine compartment/hood/tunnel Insulators: WSS-M99P32-E6 (or latest)
• Foams without the primary purpose of NVH:
• Without pressure-sensitive adhesive: WSS-M99P48-A1 (or latest)
• With pressure-sensitive adhesive: WSS-M99P48-A3 (or latest)
• For high temperature applications: WSS-M99P48-A4 (or latest)
3. REQUIREMENTS
3.1 APPROVED SOURCES
This specification is performance based and does not have approved sources.
3.2 FINISHED PART REQUIREMENTS
Detailed part construction must be submitted along with results for the testing listed in Table 1 for
initial approval. Data must be submitted via the Ford Materials Database (FMD) template. Design
Verification (DV) is done on the part to verify supplier feasibility and Product Verification Testing
(PV) is done on production parts. DV/PV and sample sizes are defined in Table 2.
In addition to the following minimum requirements, production assemblies must withstand normal
handling during shipping, installation, use, and service, without tearing, breaking, or permanently
deforming.
3.3 WEIGHT
Weight of each layer of a composite and the total composite shall be included on Engineering
Drawing.
2
3.3.1 Weight per Unit Area (Non-Foams) Report units (g/m )
(FLTM BN 106-01 Procedure A)
Date Action Revisions Rev. 1
2017 07 27 Revised See summary of revisions Z. Jatkowski, NA
2017 02 16 Released L. Schmalz, Z. Jatkowski, NA
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ENGINEERING MATERIAL SPECIFICATION
WSS-M99P32-E1
3
3.3.2 Net Density (Foams) Report units (kg/m )
(FLTM BN 106-01 Procedure B)
3.4 ODOR
(FLTM BO 131-03) Rating 3 max
3.5 FOGGING
(SAE J1756, 3 h at 100 °C heating, 21 °C
cooling plate, posttest conditioning 16 h)
Fog Number 70 min
The formation of a clear (oily) film, droplets or crystals is cause for rejection.
All materials, parts and components should be stored in an open environment for 14-28 days after
manufacture, and then must be bagged in heat sealed polyethylene (PE) or PE coated aluminum
bags for shipping. Sample shall be tested as part of a production assembly composite if it is 100%
bonded. If not 100% bonded, test each component separately. Parts for testing must be labelled
with supplier and date of manufacture.
3.6 FLAMMABILITY
(ISO 3795)
Burn Rate 100 mm/minute max
If test specimens cannot be prepared with the proper dimensions (please refer to the test method
listed above for the appropriate dimensions) using material cut from the part, properly
sized/prepared specimens must be taken from material that has been molded into a blank.
Flame should be applied to the exposed side of the component, or both sides, if the A and B
surfaces are exposed to high temperatures. Supplier shall document test conditions in their Control
Plan (for PV).
3.7 CONSTRUCTION PROPERTIES
3.7.1 Resistance to Mildew
(7 days at 98 +/- 2% relative humidity and 38 +/- 2 °C,
Specimen size 100 mm x 100 mm)
Remove the part from the cabinet and evaluate (smell the sample) immediately. The part
shall exhibit no visible evidence of mildew growth and / or objectionable odor after the 7-
day exposure. In addition, part must not separate layers or show any other visual
deterioration.
3.7.2 Environmental Testing
Conduct with the NVH or approved surrogate assembly mounted on an actual or simulated
production support foundation with the approved retention methods.
3.7.2.1 Short Term Environmental Cycling
(FLTM BO 040-01, Procedure A, 80 °C)
3.7.2.2 Long Term Environmental
(FLTM BO 040-01, Procedure B, 80 °C)
*For Paras. 3.7.2.1 and 3.7.2.2, if it is agreed upon by Soft Trim Core Engineering that the
maximum use temperature of a component is above the 80 °C requirement listed above,
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ENGINEERING MATERIAL SPECIFICATION
WSS-M99P32-E1
then that higher temperature should be used. The higher temperature should be included in
the General Notes of the Engineering Drawing.
3.8 PHYSICAL PROPERTIES
3.8.1 Original Breaking Strength (non-foam materials only) 35 N min
(ASTM D5034, except speed 25 mm/minute)
Specimens to be cut from flat areas of the finished part and the distance between clamps at
beginning of test should be 100 mm.
Report the value of the load at which the specimen breaks; include individual values,
averages, and % changes (for 3.8.1.1 and 3.8.1.2) in the data submission package. Testing
after environmental aging (3.8.1.1 and 3.8.1.2) should occur within 1 hour of removal from
environmental chamber.
Climate control applications only Report Only, N
This classification is approved for NVH materials in the climate control systems that are
installed using the low mechanical stress process of ultrasonic welding.
3.8.1.1 Change After Short Term Environmental Cycling 30% max
(conditions per Para. 3.7.2.1) Property Change
3.8.1.2 Change After Long Term Environmental 30% max
(conditions per Para. 3.7.2.2) Property Change
( − )
% ℎ = 100
3.8.2 Tear Resistance Test (foam materials only) Report Value, N/m
(ASTM D3574 Test F)
3.8.3 Compression Force Deflection Test (foam materials only) Report Value, kPa
(ASTM D3574 Test C)
3.8.4 Constant Deflection Compression Set Test (floor foam materials only)
(ASTM D3574 Test D) Testing after environmental aging (3.8.4.2 and 3.8.4.3) should occur
within 1 hour of removal from environmental chamber.
3.8.4.1 Original Report Value, %
3.8.4.2 Change After Short Term Environmental Cycling 40% max
(conditions per Para. 3.7.2.1) Property Change
3.8.4.3 Change After Long Term Environmental 10% max
(conditions per Para. 3.7.2.2) Property Change
( − )
% ℎ = 100
3.8.5 Peel Strength (Laminates only) 6 N/50 mm/min
(FLTM BN 151-05, Test specimen must be 50 mm wide) or cohesive failure
3.8.6 Moisture Absorption 30% max
Cut a 100 x 100 +/-10 mm specimen from the part to be tested and seal any cut edges, with
wax. Weigh the specimen to +/- 0.1 g.
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ENGINEERING MATERIAL SPECIFICATION
WSS-M99P32-E1
Suspend specimen at 38 +/- 2 °C and 95 +/- 2% R.H. for 24 h. Move specimen to 23 +/- 2
°C and 50 +/- 2% R.H. for 1 hour. Weigh the specimen to +/- 0.1 g and determine percent
weight increase.
( ℎ − ℎ )
∗ 100 = !
ℎ
2
3.8.7 Fiber Loss Test for Insulation (fibrous materials only) 0.4 mg/cm max
(FLTM BN 058-01)
4. GENERAL INFORMATION
The information given below is provided for clarification and assistance in meeting the requirements of
this specification. Contact gmfs@ford.com for questions concerning Engineering Material Specifications.
4.1 FUNCTIONAL REQUIREMENTS
Component supplier shall meet the NVH program specific targets as directed by Ford D&R.
Materials shall be tested according to RQT-010604-012968 for sound absorption and/or sound
transmission loss as specified by Ford D&R. Target curves should be specified on the Engineering
Drawing.
4.2 SUPPLIER'S ONGOING RESPONSIBILITY
All materials must be equivalent in all characteristics to the material upon which approval was
originally granted.
Prior to making any changes to the material originally approved, whether or not such changes affect
the material's ability to meet the specification requirements, the supplier shall notify the affected
Supplier Technical Assistance (STA), Purchasing, and Materials Engineering activities of the
proposed changes (with reasons) by submission of a completed Suppliers Request for Engineering
Approval, SREA.
For parts and components using Ford Engineering Material Specifications, all samples tested to the
specifications for Design Verification (DV), Production Verification (PV) and Production Part
Approval Process (PPAP) sign off must be kept until Job 1.
4.3 RESTRICTED SUBSTANCE MANAGEMENT STANDARD
Substance restrictions imposed by regulations or Company direction applies to the materials
addressed by this document. The restrictions are identified in the Restricted Substance
Management Standard WSS-M99P9999-A1 which is updated yearly. It is the supplier’s
responsibility to comply with this standard on a continuing basis through IMDS and or GMAP
reporting.
4.4 DRAWING CALLOUT
Engineering Drawings specifying assemblies containing materials that are required to conform to
this specification must include the following information in either a Bill of Materials table (preferred)
or in the General Notes:
• Material Performance Specification (WSS-M99P32-E1)
• Description of each layer within the material construction
2 3
• Weight of each construction (g/m or kg/m )
• Supplier and Product Code
For further information on this requirement, please contact Materials Engineering.
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ENGINEERING MATERIAL SPECIFICATION
WSS-M99P32-E1
5. SUMMARY OF REVISIONS
2017 07 27
- Clarified that fender stuffers and quarter wheelhouse insulators are not in scope.
- Clarified testing procedure for sections 3.8.1 and 3.8.4 after environmental aging.
- Moved fiber loss testing from SDS requirement to spec.
- Adjustments to DV/PV testing requirements table.
- Clarified that flammability testing for FMVSS 302 compliance can be used as surrogate
for flammability testing.
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ENGINEERING MATERIAL SPECIFICATION
WSS-M99P32-E1
Table 1: DV/PV Testing
Glass Fiber
Non-woven
Shoddy
Felt or
EPP, etc.…)
Foam (PU,
(EVA, EPDM,
Technology
Barrier
etc…)
Fleece
3.3.1 Weight per unit area 3(PV)
3.3
3.3.2 Net Density 3(PV) 3(PV)
1 (DV+PV) 1 (DV+PV) 1 (DV+PV)
3.4 Odor per per per
condition condition condition
3.5 Fogging 3(DV+PV) 3(DV+PV) 3(DV+PV)
Flammability**
3.6 5(DV+PV) 5(DV+PV) 5(DV+PV)
Interior Burn Rate - 100mm/min maximum
3.7.1 Resistance to Mildew 1(DV) 1(DV)
3.7 3.7.2.1 Short Term
Construction 1(DV+PV) 1(DV+PV)
Environmental Cycling
Properties 3.7.2
3.7.2.2 Long Term
1(DV+PV) 1(DV+PV)
Environmental
3.8.1.1 Original 5(PV)
3.8.1.2 Change After
3.8.1 Breaking Short Term 5(PV)
Strength Environmental
3.8.1.3 Change After
Long Term 5(PV)
Environmental
3.8.2 Tear Resistance 3(PV)
Compression Force
3.8.3 3(PV)
Deflection Test
3.8
3.8.4 3.8.4.1 Original 3(PV)
Physical
Properties Constant 3.8.4.2 After Steam
Deflection Autoclave Aging 3(PV)
Compression Set Exposure
3.8.4.3 After Dry Heat
3(PV)
Aging Exposure
Peel Strength
3.8.5 3(PV) 3(PV)
(Laminates only)
3.8.6 Moisture Absorption 1(PV) 1(PV)
Fiber Loss Test for
3.8.7 5(PV)
Insulation
**Where flammability is required, FMVSS 302 can be used instead of the ISO method.
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