Production & Quality
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Yellowing of Natural-Color PBT Products During Storage
Problem Phenomenon
White or natural-color PBT products turn yellow after being stored in the warehouse for several months.
Cause Analysis
The antioxidants in PBT are gradually consumed, and oxygen and ultraviolet rays in the air slowly oxidize it, causing yellowing; high storage temperature accelerates this.
Solution
Use a high-efficiency antioxidant formulation; store sealed away from light; control the storage temperature <30°C.
Key Takeaway
PBT yellowing during storage is the result of slow oxidation.
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