Polyvinyl chloride cannot be processed alone without having an appropriate heat stabilizer, lubricants, co-stabilizers, and processing aids. PVC pipes used in outdoor applications are usually stabilized by either of the three types of stabilization systems:
1. Mixed-metal stabilizers
2. Lead (Pb)-based heat stabilizers
The combination of appropriate thermal stabilizers with adequate pigments provide a high level of weathering resistance to PVC products . Titanium dioxide pigment loading up to 5-12 wt% can be used to achieve longer lifetime of the exposed products.
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