Material
Specification
Finish
GMW14669
Organic Coating/Finish Performance for Exterior and Interior Metallic
Materials
1 Introduction
Note: Nothing in this standard supersedes applicable
laws and regulations.
Note: In the event of a conflict between the Eng-
lish and the domestic language, the English language
shall take precedence.
1.1 Scope. This performance standard applies to
organic surface finishes on automobile body parts and
components.
1.2 Mission / Theme. This standard covers the per-
formance requirements for applied organic surface
finishes on automobile body parts and components.
Six types of requirements are specified in paragraph
1.3 dependent upon the severity of service operation
of the component. All interior painted metal parts
must also meet the requirements of GMW14444
Material Related Interior Part Performance.
1.3 Classification.
1.3.1 Type A1. Applicable to surface finishes used
on the external body and on external components
in areas of exceptionally severe service e.g., vehicle
front, sides, and roof.
1.3.2 Type A2. Applicable to surface finishes used
on the external body and on external components in
areas of severe service operations e.g., vehicle rear-
facing areas with little/no chipping exposure.
1.3.3 Type A3. Applicable to surface finishes used
on external components which are not type A1 or
A2, and for which performance requirements must be
specially defined; this type typically is not used.
1.3.4 Type B1. Applicable to surface finishes used
on internal body parts and components in areas of
exceptionally severe service operations e.g. solar –
direct sunlight exposure, and corrosion – items in con-
tact with wet floor, such as lower seat structure.
1.3.5 Type B2. Applicable to surface finishes used
on internal body parts and components in areas of
severe or moderate service operation e.g., solar –
indirect sunlight exposure, and corrosion – items
readily visible near floor such as brake pedal arm,
speaker grilles in lower door.
1.3.6 Type B3. Applicable to surface finishes used
on internal components in areas of normal service
operation e.g., solar – no direct sunlight exposure;
corrosion – any other steel components visible with
difficulty such as upper structure under seats, struc-
tures visible with closures (e.g. glove box) open or
seats folded. Note: structures not visible to cus-
tomers (e.g. I.P. support) may require only temporary
corrosion protection not covered under this standard.
1.3.7 It is anticipated that some interior components
may have mixed service severity (e.g. B1 for corro-
sion and B3 for solar). In this case the most severe
type shall be listed and exception(s) noted on the
engineering drawing.
1.3.8 This standard does not cover performance
requirements for:
1.3.8.1 Organic coatings on highly stressed exterior
parts (e.g. road wheels). See GMW14670 for steel
wheels and/or GMW14885 for aluminum wheels.
1.3.8.2 Organic coatings on chassis components.
See GMW14671.
1.3.8.3 Organic coatings on plastic parts. See
GMW14797.
2 References
Note: Only the latest approved standards are appli-
cable unless otherwise specified.
2.1 External Standards/Specifications.
ISO 105-A02
ISO 2813
ISO 15184
SAE J1545
SAE J1767
SAE J1885
2.2 GM Group Standards/Specifications.
GM9163P
GM9509P
© Copyright 2007 General Motors Corporation All Rights Reserved
Publication Department: GME Specification Center
August 2007 Page 1 of 9
PRD045 - VPRE ST 1 10/03
Copyright GM Worldwide
Provided by IHS under license with GMW
Not for ResaleNo reproduction or networking permitted without license from IHS
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GMW14669 GM EUROPE ENGINEERING STANDARDS
GM9900P
GME 60203
GME 60400
GME 60402
GME 60404
GME 60406
GMW3005
GMW3059
GMW3286
GMW14162
GMW14264
GMW14333
GMW14334
GMW14444
GMW14670
GMW14671
GMW14700
GMW14701
GMW14729
GMW14797
GMW14829
GMW14872
GMW14873
GMW14885
GMW15282
GMW15287
GMW15356
GMW15357
HN 0283
HN 0292
3 Test Preparation and Evaluation
3.1 Resources.
3.1.1 Calibration. The test facilities and equipment
shall be in good working order and shall have a valid
calibration label.
3.1.2 Alternatives. Alternative test facilities and
equipment may also be used. However, all measur-
ing variables as specified in this specification shall
be determined correctly with respect to its physical
definition.
3.1.3 Facilities.
3.1.3.1 Apparatus as required by the appropriate test
methods.
3.1.4 Equipment. Not applicable.
3.1.5 Test Vehicle / Test Piece. The size, dimen-
sions and number of test pieces shall be as specified
in the relevant test method for the property concerned.
3.1.6 Test Time. Not applicable.
3.1.7 Test Required Information. Not applicable.
3.1.8 Personnel / Skills. Not applicable.
3.2 Preparation. Conditioning, where required, shall
be as specified in the relevant test method for the
property concerned.
3.3 Conditions. Subparagraphs were not applica-
ble.
3.4 Instructions. Not applicable.
3.5 Data. Not applicable.
3.6 Safety. This standard may involve hazardous
materials, operations and equipment. This standard
does not propose to adress all the safety problems
associated with its use. It is the responsibility of the
user of this standard to establish appropriate safety
and health practices and determine the applicability
of regulatory limitations prior to use.
3.7 Documentation. Samples of components or
material released to this standard shall be tested for
conformity with the requirements of this standard and
approved by the responsible GM Department prior to
the start of delivery of production level components
or materials.
Any change to the component or material e.g. design,
function, properties, manufacturing process and/or
location of manufacture requires a new release
of the product. It is the sole responsibility of the
supplier to provide the customer, unsolicited, with
documentation of any change or modification to the
product/process, and to apply for a new release.
If not otherwise agreed to the entire verification test
shall be repeated and documented by the supplier
prior to start of delivery of the modified or changed
product. In some cases a shorter test can be agreed
to between the responsible GM Department and the
supplier.
3.7.1 Test Results. The results shall be represented
in a test report with reference to this standard.
3.7.2 Deviations from Test Procedure. Deviations
from the requirements of the test procedures shall
have been agreed upon. Such requirements shall
be specified on component drawings, test certificates,
reports etc.
4 Requirements and Procedure
4.1 General.
4.1.1 Post-treatment. Post-treatments, if per-
formed, shall be Chrome VI free.
© Copyright 2007 General Motors Corporation All Rights Reserved
Page 2 of 9 August 2007
PRD045 - VPRE ST G 10/03
Copyright GM Worldwide
Provided by IHS under license with GMW
Not for ResaleNo reproduction or networking permitted without license from IHS
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GM EUROPE ENGINEERING STANDARDS GMW14669
4.1.2 Chrome VI used as adhesion promoter is
impermissible.
4.1.3 Coatings shall be Chrome VI free.
4.2 Cross Hatch Test. Test per GMW14829.
Coatings must perform both as-received and after
humidity exposure to GMW14729 of the hours shown.
Type A1 and A2: Rating 0 after 120 h
Type A3: Must be specially defined
Type B1: Rating 0 to 1 after 96 h
Type B2 and B3: Rating 0 to 1 after 24 h
Note: Rating 0 requires ³ 99 % adhesion, and
Rating 1 requires ³ 95 %
4.3 Testing to High Humidity Environments. Test
per GMW14729.
Type A1 and A2: 240 h
Type A3: Must be specially defined
Type B1: 96 h
Type B2 and B3: 72 h
Performance: Components shall show no surface
change.
4.4 Corrosion Tests. The determination of the resis-
tance of the organic coating to corrosion has to be
done by a salt spray fog test or by a cyclic corro-
sion test. If the coating is intended to be used for
painting of aluminum substrates, an additional cyclic
climate test is necessary (refer to paragraph 4.4.3).
Body assembly or subassembly parts and compo-
nents shall be tested in vehicle position. Interior com-
ponents/assemblies shall have coverings (e.g. seat
cushions) removed.
4.4.1 Salt Spray Fog Test (required for GME and
GMHA only). Salt spray fog testing for 336 h (Type
A1 and A2), 168 h (Type B1), 96 h (Type B2) and
24 h (Type B3) shall be performed according to
GMW3286. No corrosion (except along scribe lines)
blisters, or any change of surface allowed. Total
scribe creepback determined per GMW15282 shall
be 3 mm max. for all substrates. Exception: Zinc
coated steel substrates 6 mm max. (The evaluation
of scribe creepback can be determined by scrape
and blow off with compressed air per GMW15282 or
by using tape adhesion per GMW14829).
Note: Slight rust at edges is permitted for Type B, but
shall not exceed 20 % of the length of exposed edges.
4.4.2 Cyclic Corrosion Test (required for all
regions except GME and GMHA). A Cyclic corro-
sion test per GMW14872 is required to be performed
on normally processed parts, or representative
sections of parts. Refer to the Table in Appendix
A for specific details associated with required test
duration for specified test class suffix, vehicle area,
and mounting location.
Type A: Corrosion Rating of 8 or better per
GMW15356.
Type B: Corrosion Rating of 8 or better per
GMW15356 or GMW15357.
4.4.3 Cyclic Climate Tests for Exterior Painted
Parts with Aluminum Substrates. Aluminum sub-
strates may be tested and evaluated per either of the
following two methods:
4.4.3.1 Cyclic Climate Test (for Aluminum sub-
strates only). The determination of resistance
of the coating to corrosion under cyclic alternat-
ing conditions has to be performed according to
GME 60203-F-Grade 7 or per an acceptable method
on agreement of the supplier and GM Materials
Engineer. After the test, no corrosion or blisters
(£ 2 mm) except along the scribe line, or any change
of surface are allowed. Total corrosion creepback
according to GMW15282 shall be 2 mm max. (The
evaluation of creepback can be realized by blowing
with compressed air or by using adhesive tape per
GMW14829).
4.4.3.2 Filiform Corrosion Test (for Aluminum
substrates only). Test parts per GMW15287.
Painted parts must meet a filiform resistance require-
ment of no more than 4 mm max. length of any
filament from the scribe line after a period of 672 h
in humidity. Also, there shall be no filament growth
on the non-scribed test surfaces at the end of test,
excluding sample-prepared cut edges.
4.5 Scratch Resistance. Test per GME 60402. See
paragraph 4.5.1 and 4.5.2 for test time duration and
performance requirements.
4.5.1 144 h salt spray exposure (GME 60402 - 1A)
Type A1, A2 and B1: Rating 1
Type A3: Must be specially defined
Type B2, B3: Not applicable
4.5.2 72 h salt spray exposure (GME 60402-1B).
Type A1, A2, A3, and B1: Not applicable
Type B2: Rating 1
Type B3: Rating 1 (after 24 h salt spray)
4.5.3 Optionally, pencil hardness test per ISO 15184
may be used to evaluate scratch resistance; require-
ment is 1H to 3H.
© Copyright 2007 General Motors Corporation All Rights Reserved
August 2007 Page 3 of 9
PRD045 - VPRE ST U 10/03
Copyright GM Worldwide
Provided by IHS under license with GMW
Not for ResaleNo reproduction or networking permitted without license from IHS
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GMW14669 GM EUROPE ENGINEERING STANDARDS
4.6 Cure Test. Test per GM9509P.
Applicable to all coating types; shall show no more
than slight – barely observable change to paint sur-
face (Rating 0 or 1).
4.7 Anti-Freeze Resistance. Test per GME 60406.
Type A1 and A2: Rating 2
All other types: Not applicable
Performance: No swelling, no dissolution, and no
discoloration.
4.8 Resistance to Color Change. Test per
GMW14701.
Type A1 and A2: Rating 0
All other types: Not applicable
4.9 Resistance to Surface Deterioration by Chem-
ical Action. Test per GME 60404.
Type A1 and A2: Rating 0
Type A3: Must be specially defined
Type B1: Rating 1
Type B2 and B3: Not applicable
4.10 Resistance to Exterior Glass Washer Fluid.
Test per HN 0292.
Type A: Rating ³ 8
Type B: Not applicable
Performance: Coating surface must show no less
than subjective Rating of 8 per GMW14264.
Note: Must choose fluid composition(s) (i.e. basic
alcohol) appropriate for vehicle operating area(s).
4.11 Abrasion Resistance. Test per GME 60400
(where component size permits).
Type A1 and A2: ³ 1.2 l/µm
Type A3: Must be specially defined
Type B1 and B2: ³ 0.5 l/µm
Type B3: Not applicable
4.12 Fuel Resistance. Test per GMW14333 - A.
This test shall be run only if specifically required by
drawing notes.
Type A1 and A2: Rating 2
Type A3: Must be specially defined
Type B: Not applicable
Performance: No swelling, no dissolution, and no
discoloration. No paint removal to previous surface,
or lifting, peeling or defect in paint film.
4.13 Resistance to Cleaning Agents. Test per
GMW14334.
All Types: Rating 2
Alternatively, testing per GM9900P; satisfactory per-
formance required for all coating types.
Note: Must choose cleaning compounds appropriate
for and available in vehicle operating areas.
4.14 Resistance to Stone Impact. Test per
GMW14700 Method A (or B), and Method C.
Type A1: Rating 8
Type A2: Rating 7
Type A3: Must be specially defined
Type B: Not applicable
4.15 Gloss. Test per ISO 2813.
Gloss standards and measurement frequency are
specified elsewhere in other documents by a GM
Engineering Unit.
4.16 Weather Resistance. Paragraph 4.16.1 and
4.16.2 apply to topcoat systems only, for initial (paint)
sample approval only.
Note: These requirements apply to interior (Type B)
parts only. Exterior (Type A) paint and part require-
ments are covered in GMW3005.
Note: These requirements were not intended for use
in routine quality testing.
Deviation from the stated requirements is subject to
arbitration between the supplier and the appropriate
GM Materials Engineer.
4.16.1 Natural Weathering. Natural weathering is
required for the validation process of a paint mate-
rial itself. This test is not applicable for painted body
parts; please refer to Appendix B for Specific Regional
Requirements and Test Methodologies.
4.16.2 Accelerated Weathering. If a supplier shall
be able to prove a positive result of 2 years natural
weathering test, the accelerated weathering test is not
applicable for body parts. Please refer to Appendix B
for Specific Regional Requirements and Test Method-
ologies.
4.16.3 Color measurements per SAE J1545 and
SAE J1767 in CIELAB color scale, dE* £ 3.0 (D65
illuminant, 10 observer, 45 geometry.
5 Provisions for Shipping
Not applicable.
© Copyright 2007 General Motors Corporation All Rights Reserved
Page 4 of 9 August 2007
PRD045 - VPRE ST G 10/03Copyright GM Worldwide
Provided by IHS under license with GMW
Not for ResaleNo reproduction or networking permitted without license from IHS
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GM EUROPE ENGINEERING STANDARDS GMW14669
6 Notes
Subparagraphs were not applicable.
7 Additional Paragraphs
7.1 All parts or systems supplied to this specifica-
tion must comply with the requirements of GMW3059,
Restricted and Reportable Substances for Parts.
7.2 Other additional requirements may be specified
on the relevant component drawings.
8 Coding System
This standard shall be referenced in other documents,
drawings, etc. as follows:
Example: “GMW14669 Type X# (e.g. GMW14669
Type A1)”
9 Release and Revisions
9.1 Release. This standard originated in OCT 2005,
replacing GME 00007. It was first approved by Global
Materials Engineering in SEP 2006 and published in
AUG 2007.
© Copyright 2007 General Motors Corporation All Rights Reserved
August 2007 Page 5 of 9
PRD045 - VPRE ST U 10/03Copyright GM Worldwide
Provided by IHS under license with GMW
Not for ResaleNo reproduction or networking permitted without license from IHS
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GMW14669 GM EUROPE ENGINEERING STANDARDS
Appendix A
Requirements for Cyclic Corrosion Test (applicable to all regions except GME and GM Holden)
Test Class Suffix Type A Type B
Vehicle Area Exterior Note 1 Secondary Surface Secondary Surface Interior
B1
Interior
B1, B2
Mounting Location All Note 1 Outside
Weatherstrip Note 2
Inside
Weatherstrip Note 3
Low Mount Note 4 Mid-to-High
Mount Note 5
Gravelometer &
Cyclic Corrosion
(GMW14700 &
GMW14872
Not
applicable Not applicable Not applicable Not applicable Not applicable
Cyclic Corrosion &
Scribe Creepback
(GMW14872 &
GMW15282)
Duration C
(a)
Duration C
(a)
Duration C
(a)
Duration C
(a)
Duration C
(a)
Acceptance Criteria Corrosion Rating 8 or better per GMW15356 Corrosion Rating 8 or better
per GMW15357
Note: The Testing Criteria will be indicated by the Test Class Suffix (e.g. GMW14669 – A).
When the Test Class Suffix is not indicated (for example, GMW14669), the Testing Criteria will be based on
the part’s location on the vehicle per the following:
Note 1 Exterior Surface Parts – EXT All, Method SH/SL Duration C cosmetic evaluation and scribe creepback
evaluation, Duration D for functional evaluation (if applicable). Mass loss targets are defined in GMW14872.
Note 2 Secondary Surface Parts, Area I (Outside Weatherstrip) – SS OW, Method SH/SL Duration C cosmetic
evaluation and scribe creepback evaluation, Duration D for functional evaluation (if applicable). Mass
loss targets are defined in GMW14872.
Note 3 Secondary Surface Parts, Area II (Inside Weatherstrip) – SS IW, Method SH/SL Duration C cosmetic
evaluation and scribe creepback evaluation, Duration D for functional evaluation (if applicable). Mass
loss targets are defined in GMW14872.
Note 4 Interior Parts, Area I (low mount location): INT Low, Method SH/SL, Duration C cosmetic evaluation
and scribe creepback evaluation, Duration D for functional evaluation (if applicable). Mass loss targets are
defined in GMW14872.
Note 5 Interior Parts, Area II (mid-to-high mount location): INT Mid/High, Method SH/SL, Duration C cosmetic
evaluation and scribe creepback evaluation, Duration D for functional evaluation (if applicable). Mass
loss targets are defined in GMW14872.
Note 6 Gravelometer testing is required, but not in conjunction with GMW14872.
(a): Maximum allowable creepback is 6 mm on bare steel and cast iron substrates and 3 mm creepback
on all other substrates.
© Copyright 2007 General Motors Corporation All Rights Reserved
Page 6 of 9 August 2007
PRD045 - VPRE ST G 10/03Copyright GM Worldwide
Provided by IHS under license with GMW
Not for ResaleNo reproduction or networking permitted without license from IHS
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GM EUROPE ENGINEERING STANDARDS GMW14669
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