Material Analysis
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ASA Weather Resistance Test Verification
Fenómeno del problema
【Problem Phenomenon】ASA supplier claims weather resistance, lacking quantitative verification means
Análisis de la causa
Weather resistance must be verified according to standards: ASTM G155/ISO 4892 xenon lamp aging, Delta E<3 is a typical requirement; gloss retention, chalking rating, impact retention are assessed simultaneously
Solución
Do 1000-5000h aging verification according to ASTM G155; Delta E, gloss, chalking, impact four indicators for acceptance; supplier data reviewed on-site
Conclusión clave
ASA weather resistance looks at Delta E<3 four indicators, claims are inferior to verification; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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