• Reason: There are two main reasons, 1 is the poor weather resistance of the profile product itself, which may be due to the poor weather resistance of the stabilizer used or the improper variety and content of titanium dioxide. The 2 is sulfur lead pollution discoloration, which mainly occurs in the use of lead salt stabilizer white profile products, lead salt stabilizer in the humid and high temperature environment in the air free sulfur reaction, resulting in black gray lead sulfide profile discoloration.
• Solution: For discoloration caused by poor weather resistance, you can choose a stabilizer with better weather resistance, increase the co-extrusion material, or increase the rutile titanium dioxide content in the product. For sulfur and lead pollution discoloration, lead salt stabilizers should be avoided and production should be carried out in strict accordance with relevant standards.
