Production & Quality
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Wrong use of PP homopolymer/copolymer grades
Fenómeno do problema
Homopolymer PP is used for products requiring impact resistance/low temperature resistance, or copolymer PP is used for high-rigidity parts, and the performance does not meet the standard.
Análise das causas
Homopolymer PP has high rigidity but is brittle at low temperature, while copolymer PP has good impact resistance but slightly lower rigidity; when selecting materials, the grade type is not matched according to the use environment (temperature, impact, rigidity), resulting in inherent performance mismatch.
Solução
①Clarify rigidity, toughness, and temperature resistance requirements according to the use environment; ②select copolymer PP for low-temperature/impact scenarios and homopolymer PP for high-rigidity scenarios; ③select block copolymer or toughened modified grades when necessary; ④establish a material selection review to avoid using the wrong material based on experience.
Conclusão principal
For PP material selection, first distinguish 'homopolymer or copolymer': choose homopolymer for rigidity, copolymer for impact resistance and low temperature resistance; many 'quality problems' are actually material selection errors, which cannot be compensated no matter how good the process is.
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