Blow Molding
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ABS and ASA weather resistance comparison
Problem Phenomenon
[Problem phenomenon] Outdoor parts using ABS yellow in one year, evaluating ASA substitution
Cause Analysis
ABS butadiene double bonds are attacked by UV causing yellowing and embrittlement; ASA acrylate has no double bonds and weather resistance is essentially improved; long-term outdoor exposure must be upgraded; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
Outdoor parts prefer ASA; indoor parts ABS cost-effective; ABS outdoor parts add coating or switch to ASA; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
ABS outdoor yellowing is destiny, weather resistance upgrade selects ASA; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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