Blow Molding
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PVC vs ABS/PP Comparison
Problem Phenomenon
PVC was chosen to replace ABS to save material cost, but the scrap rate stayed high and total cost rose instead
Cause Analysis
PVC raw material is 40-60% cheaper but difficult to process: scrap rate, anti-corrosion molds, and long cycles can increase total cost by 5-20%; when there is no chemical resistance or flame retardant requirement, PP/ABS is more economical
Solution
①Select material by application requirements rather than only raw material price; ②choose PVC for chemical corrosion resistance and flame retardant scenarios; ③choose ABS/PP for consumer electronics and appearance parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The cost of PVC must be calculated as a total; cheap material does not equal cheap parts, and process cost must be included; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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