DATA
SIGMACOVER 522
(SIGMARITE SEALER)
5 pages September 2005
Revision of September 2004
DESCRIPTION two component micaceous iron oxide pigmented polyamide cured epoxy
primer/sealer/coating
PRINCIPAL CHARACTERISTICS – may be used as a primer, sealer or coating
– excellent adhesion to and sealing of weathered, cleaned zinc rich
primers and metal sprayed steel
– good adhesion to properly pretreated galvanised steel
– excellent adhesion to blast cleaned steel
– can be used in systems for atmospheric or water immersed exposure
conditions
– good resistance to industrial or chemical contaminated atmospheric
exposure conditions
– good abrasion and impact resistance
– good adhesion characteristics for subsequent coats
– resistant to temperatures up to 200°C in dry atmospheric exposure
conditions
COLOURS AND GLOSS redbrown, greenish grey - low metallic sheen
BASIC DATA AT 20°C (1 g/cm³ = 8.25 lb/US gal; 1 m²/l = 40.7 ft²/US gal)
(data for mixed product)
Mass density 1.8 g/cm³
Volume solids 60 ± 2%
VOC (supplied) max. 210 g/kg (Directive 1999/13/EC, SED)
max. 374 g/l (approx. 3.1 lb/gal)
Recommended dry film 40 - 80 µm * depending on system
thickness
Theoretical spreading rate 15 m²/l for 40 µm *
Touch dry after 2 hours *
Overcoating interval min. 8 hours *
max. 1 month *
Full cure after 7 days *
(data for components)
Shelf life (cool and dry place) at least 24 months
Flash point base 26°C, hardener 26.5°C
* see additional data
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DATA
SIGMACOVER 522
(SIGMARITE SEALER)
September 2005
RECOMMENDED – steel; blast cleaned to ISO-Sa2½
SUBSTRATE CONDITIONS – shop primed steel; sweep blasted to SPSS-Ss or power tool cleaned to
AND TEMPERATURES SPSS-Pt3
– zinc primed steel: free from any contamination and zinc salts
– galvanised steel; for atmospheric exposure conditions disc sanding, free
from any contamination and zinc salts; for water immersed exposure
conditions sweep blasting is required
– not weathered metal sprayed steel; free from any contamination and
salts
– previous suitable coat; dry and free from any contamination
– substrate temperature should be above 10°C and at least 3°C above dew
point during application and curing
– for atmospheric exposure conditions the minimum substrate
temperature for application may be 5°C, but at low temperature the
curing slows down according to the overcoating and curing tables
REMARK
when used as an adhesion primer or when a long overcoating interval is
expected a max. dft of 50 µm must be specified in order to preserve the
rough texture
INSTRUCTIONS FOR USE mixing ratio by volume: base to hardener 82 : 18
– the temperature of the mixed base and hardener should preferably be
above 15°C, otherwise extra solvent may be required to obtain
application viscosity
– too much solvent results in reduced sag resistance
– thinner should be added after mixing the components
Induction time none
Pot life 8 hours at 20°C *
* see additional data
AIRLESS SPRAY
Recommended thinner Sigma thinner 91-92
Volume of thinner 5 - 10% for dft of approx. 80 µm
25 - 30% for dft of approx. 40 µm when used for sealing inorganic zinc and
metal sprayed steel
Nozzle orifice approx. 0.48 - 0.53 mm (= 0.019 - 0.021 in)
Nozzle pressure 12 - 15 MPa (= approx. 120 - 150 bar; 1700 - 2130 p.s.i.)
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DATA
SIGMACOVER 522
(SIGMARITE SEALER)
September 2005
AIR SPRAY
Recommended thinner Sigma thinner 91-92
Volume of thinner 10 - 30%, depending on required thickness and application conditions
Nozzle orifice 1.5 - 2 mm
Nozzle pressure 0.3 - 0.4 MPa (= approx. 3 - 4 bar, 43 - 57 p.s.i.)
BRUSH/ROLLER
Recommended thinner Sigma thinner 91-92
Volume of thinner 0 - 5%
CLEANING SOLVENT Sigma thinner 90-53
SAFETY PRECAUTIONS for paint and recommended thinners see safety sheets 1430, 1431 and
relevant material safety data sheets
this is a solvent based paint and care should be taken to avoid inhalation of
spray mist or vapour as well as contact between the wet paint and exposed
skin or eyes
ADDITIONAL DATA Film thickness and spreading rate
theoretical 15 7.5
spreading rate m²/l
dft in µm 40 80
Overcoating table
substrate 5°C 10°C 20°C 30°C 40°C
temperature
minimum 36 hours 16 hours 8 hours 6 hours 4 hours
interval dft 50
µm
minimum 3 days 32 hours 16 hours 12 hours 8 hours
interval dft 80
µm
maximum 28 days 28 days 28 days 14 days 7 days
interval
– surface should be dry and free from any contamination
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DATA
SIGMACOVER 522
(SIGMARITE SEALER)
September 2005
Note
– the minimum overcoating time should be multiplied by 5 when
SigmaCover 522 is to be applied on top of an existing old (alkyd) primer
or coating
– the maximum overcoating time of SigmaCover 522 could be extended up
to 6 months provided the dft is not higher than 50 µm
– surface should be properly cleaned
– glossy finishes require an adhesion promoting undercoat
Curing table
substrate touch dry dry to handle full cure
temperature rainproof
5°C 8 hours 18 hours --
10°C 5 hours 8 hours 15 days
15°C 3.5 hours 6 hours 10 days
20°C 2 hours 4 hours 7 days
25°C 1.5 hour 4 hours 5 days
– adequate ventilation must be maintained during application and curing
(please refer to sheet 1433 and 1434)
– for optimum resistance in tankcoating systems a minimum substrate
temperature of 10°C is essential
Pot life (at application viscosity)
15°C 10 hours
20°C 8 hours
25°C 6 hours
30°C 5 hours
35°C 4 hours
Worldwide availability Whilst it is always the aim of Sigma Coatings to supply the same product on
a worldwide basis, slight modification of the product is sometimes
necessary to comply with local or national rules/circumstances.
Under these circumstances an alternative product data sheet is used.
REFERENCES Explanation to product data sheets see information sheet 1411
Safety indications see information sheet 1430
Safety in confined spaces and health safety
Explosion hazard - toxic hazard see information sheet 1431
Safe working in confined spaces see information sheet 1433
Directives for ventilation practice see information sheet 1434
Cleaning of steel and removal of rust see information sheet 1490
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DATA
SIGMACOVER 522
(SIGMARITE SEALER)
September 2005
LIMITATION OF LIABILITY
The information in this data sheet is based upon laboratory tests we believe to be accurate and is intended for guidance
only. All recommendations or suggestions relating to the use of the products made by Sigma Coatings, whether in technical
documentation, or in response to a specific enquiry, or otherwise, are based on data which to the best of our knowledge
are reliable. The products and information are designed for users having the requisite knowledge and industrial skills and
it is the end-user's responsibility to determine the suitability of the product for its intended use.
Sigma Coatings has no control over either the quality or condition of the substrate, or the many factors affecting the use
and application of the product. Sigma Coatings does therefore not accept any liability arising from loss, injury or damage
resulting from such use or the contents of this data sheet (unless there are written agreements stating otherwise).
The data contained herein are liable to modification as a result of practical experience and continous product development.
This data sheet replaces and annuls all previous issues and it is therefore the user's responsibility to ensure that this sheet
is current prior to using the product.
The English text of this document shall prevail over any translation thereof.
DS 7420
179510 greenish grey 9048052200
179508 redbrown 9028052200
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