1.PVC turns yellow over time due to chemical reaction that occurs when it is exposed to light, oils etc. The primary culprit of yellowing of PVC is UV light. But exposure to visible light, extreme temperature, humidity or exposure to solvents can also cause a polymer to yellow over time.

2.PVC is a mixture of ingredients and there are infinite recipes. One of the main and most expensive ingredients is titanium,rutile titanium pigments is the basic material of PVC profiles. If sharp Titanium Pigments are used, the profiles will undoubtedly yellowing. If the rutile type of inferior titanium metal pigments are used, the profile coating is easy to yellowing. and some extruders who want a cost-effective PVC will reduce its amount. Unfortunately, this type of PVC will tend to yellow over time (sunburn).

3.The degradation of PVC materials, PVC produced by ethylene method is usually more stable than calcium carbide in the processing process, and the amount of heat stabilizer should not be too small.

4.he quality of CPE also affects the color of the product. We recommend using some well-known brands or ACR impact modifiers. Although the price of ACR impact modifiers is high, reasonable formulation can be adjusted to balance cost and quality.

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