Material Analysis
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PVC Impact Modification
Problem Phenomenon
Rigid PVC parts cracked brittlely at low temperature, failed the drop test, and outdoor applications were limited
Cause Analysis
Rigid PVC itself is highly brittle and worse at low temperature; impact modifiers such as CPE, MBS, and ACR can significantly improve toughness; modifier selection also affects transparency and weather resistance
Solution
①Choose impact-modified grades for toughness requirements; ②choose MBS for transparent parts and ACR for weather-resistant parts; ③conduct low-temperature impact verification for low-temperature applications; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The toughness of rigid PVC relies on modifiers to make up the deficit; select the modification system according to transparency and weather resistance requirements; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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