Which kind and which quantity of TiO2 do I have to use to achieve good outdoor weatherability of profiles?
The TiO2 must be of the rutile type. For Europe, the grade must not be too photoactive. The quantity depends on the climate. For the North of Europe, a minimum amount of 4 phr is recommended, for the South of Europe, a minimum of 5 phr is recommended. For very hot and dry climates, 6 to 10 phr could be requested. h.
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