The pink discolouration extends only to around 5 x10 6 m into the bulk of the material. The pinking phenomenon which is known to occur in white pvc profiles has been investigated in detail in terms of test evaluations and analysis methods for determining the mechanism and nature of the species responsible. Pinking is the result of a combination of specific titanium dioxide pigment properties with generic lead based stabilisation used by extrusion manufacturers during this period.
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