This standard specifies the contents, methods, conditions and equipment of the atmospheric exposure test for auto parts.
This standard is applicable to auto parts and metal pieces made of plastic, rubber, artificial leather, fiber, etc.
This standard is not applicable to parts such wire, tyre, vibration isolating rubber, air spring, etc.
2 Normative References
GB 250 Fading Scale for Color Fastness
GB 2410 Transparent Plastics; Transmissivity and Haze Test
GB 2918 Plastics-Standard Atmospheres for Conditioning and Testing
GB 2941 Rubber-Standard Temperatures, Humidity and Times for the Conditioning Environmental and Testing of Test Pieces
GB 3511 The Test Method of Rubber Resistance to Natural Weathering
GB 3681 Test Methods for Plastics Exposure in Natural Climate
GB 9754 Paints and Varnishes - Determination of Specular Gloss of Non-metallic Paint Films at 20°, 60°and 85°
GB 9277.2 Evaluation of Degradation of Paint Coatings--Part 2: Designation of Degree of Blistering
GB 9277.3 Evaluation of Degradation of Paint Coatings--Part 3: Designation of Degree of Rusting
GB 9277.4 Evaluation of Degradation of Paint Coatings--Part 4: Designation of Degree of Cracking
GB 9277.5 Evaluation of Degradation of Paint Coatings--Part 5: Designation of Degree of Flaking
GB 1767 Determination Method for Film Weatherability
3 Terms
3.1 Weather resistance: the ability of specimen to resist aging in the natural climate conditions of daylight, ozone, rain & snow, humidity, temperature, etc.
3.2 Light resistance: the resistance of the specimen surface to aging under the action of light.
3.3 Aging: the phenomena that the performance of the specimen declines by being exposed to natural or artificial environment conditions.
3.4 Exposed surface: the surface of the specimen directly contact with daylight, ozone, rain, snow, etc.
3.5 Effective surface: the active surface of parts in the service.
a. The surface which is directly visible under service state;
b. Any change of the surface condition may directly affect the performance of parts.
3.6 Reference specimen: the sample piece preserved under specified conditions and used for periodic observation and comparison.
3.7 Fading: the change of specimen caused by the deterioration of pigment chromaticity, brightness variation and other constituents during the test process.
3.8 Contact stain: the change caused by mutual interaction when different materials contacts.
3.9 Dirt: the irremovable spots on the exposed surface caused by the adherence or impregnation of harmful gas, organic substances, etc. in the air.
3.10 Peeling: partial surface protective film or bonding part of the specimen fall off or bulge.
3.11 Applicable datum: the test specification determined according to the service conditions and importance of the parts.
