When manufacturing outdoor profiles, what are the ways to enhance the weather resistance of the profiles?

The main approaches are as follows:
① Add light stabilizers, such as UV-531;
② Select Type 5 PVC resin, with a degree of polymerization of about 1,000, a K value of 66–68, and a viscosity of 107–118;
③ In terms of stabilizer selection, the anti-aging performance of lead-based composite stabilizers is better than that of rare-earth stabilizer systems;
④ In terms of titanium dioxide selection, using more than 8 parts of rutile-type titanium dioxide significantly improves weathering resistance;
⑤ In terms of impact modifiers, the ACR series performs significantly better than the CPE series.
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