Galrajas Service specifications Taber abrader Paints and varnishes — Determination of resistance to humidity — Part 2: Test method for gnw thickness of trim materials; Coding 2: Modified Martindale method Textiles — Tensile properties of fabrics — Part 1: Procedures of test for cellular and related materials — Determination of resistance to humidity ageing Autoclaving. Crosshatch test Scratch, cut and surface tests with small appliance eg test rod, scalpel. Scratch resistance of organic coatings and self-adhesive foils; Method A: Solvent rub method for determining cure of painted metal or plastic substrates Media resistance, manually. Instrumental assessment of change in colour for determination of grey scale rating Textiles — Tests for colour fastness — Part E Typical applications include the following: Test method for determining thickness of trim materials; Coding 1: Resistance to Snagging of textile Materials Universal testing machine, tensile, bending, tear tests. Safety and quality are among the demands placed on modern materials used in the automotive industry.
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Note: In the event of conflict between the English and domestic language, the English language shall take precedence. Organic surface coatings on plastic parts and components used for exterior applications on motor vehicles, and also for painted components within the engine compartment. This specification details the performance requirements for applied paints on plastic parts, used for either exterior or engine compartment applications on motor vehicles.
These tests are normally performed on plaques that were painted in a laboratory, but can also be completed on the production part or surrogate parts. Conformance to these requirements is the first step of the approval process. Additional steps include: testing parts that were painted in production and monitoring quality during an extended production run.
For GME, LAAM, and others where specified, three types of requirements are specified dependent upon the severity of service operation of the component: 1. Applicable to surface finishes used on the external body and on external components. Applicable to surface finishes on integral skinned polyurethane foam parts used on the external body, e. Applicable to surface finishes used on components within the engine compartment.
Not applicable. If tests are performed outside of GM, all testing shall be performed in an accredited laboratory. This testing need be performed only if the substrate does not currently have an APOPS number in the database i.
For example, per GMM for basecoat, clearcoat minimum 1. This testing must be performed on production parts for each combination of substrate, paint, and manufacturing location. If regrind is allowed, all specimens for testing must be obtained from production parts that are made from the maximum allowable regrind as stated on the drawing. In this case, three samples may be taken from different locations on the same part.
See Figure 2 for example of testing locations. Since fascias vary in design, please see responsible GM Materials Engineer if you need assistance in choosing the locations. If the color palette contains a Tricoat such as Bright White Diamond , that color must be tested in addition to the two standard colors. If the two standard colors are not contained in the color palette, the GM Materials Engineer may approve substitutions.
If white is not contained in the color palette, use color with highest film build. See responsible GM Materials Engineer to confirm test requirements for APOPS on primed parts, and to determine the number of parts to be topcoated and to coordinate the topcoating of the parts in the assembly plant. All bakes must comply with GM Paint approved bake charts for each specific product. GM Paint approved bake charts are those that have an approval signature of the responsible GM engineer at the bottom.
These bake charts may be obtained from the paint suppliers. Option 2: The adhesion promoter is applied wet on wet and co-baked with an approved topcoat low bake system Defined as running a previously finished part through the original OEM process. The following must be followed at a minimum for all part reprocesses: 3. Sanding is allowed on the topcoat system to remove surface imperfections or defects.
Documentation of sanding process is required. For GME, multiple coatings are defined for maximum one single over-painting of the complete paint system. Multiple coatings are not permissible for original equipment parts and parts for aftersales service.
Exception: Multiple coatings for original equipment parts are only permissible, if the coloring is acceptable. No adverse changes are permissible. Tests shall be conducted using the latest issue of the test methods indicated.
Unless otherwise specified, painted samples shall be subjected to the testing after a minimum aging period of 72 h following the baking or drying cycle. A shorter aging period may be used, provided it is recognized that this represents a more severe condition of test and that results obtained at different aging times under 72 h are not a good basis for comparing the relative performance characteristics of paint finishes.
Samples of components or material released to this specification shall be tested for conformity with the requirements of this specification and approved by the responsible GM department prior to the start of delivery of production level components or materials.
For GME, any change to the component or material, e. Unless 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. Enlarge as required. A subset of the tests on this form may be used to report PPAP data.
GMW 14797 Apr2007
GMW 14797 PDF