The yellowing and darkening of the PVC profile may be due to the insufficient amount of stabilizer, which leads to poor thermal stability in the system and causes yellowing of the powder when heated.

Insufficient external lubrication causes excessive friction between materials and equipment, and excessive frictional heat causes material decomposition; Insufficient external lubrication results in a slow discharge speed, which causes the material to stay in the barrel for too long and the heating time to cause yellowing.

The temperature of the material machine is too high or the die temperature is too high, which causes yellowing and deep hue.

Qingdao Sainuo Chemical Co.,Ltd.  We are manufacturer for PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS…. Our products have passed the REACH, ROHS, PAHS, FDA testing.

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Website：https://www.sanowax.com

E-mail：sales1@qdsainuo.com

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