All of our plastic trims, except Clear and Silver have UV stabilisers included within the PVC Compound allowing them to be used externally.
The main purpose of the UV stabilisers is to minimise colour fade and also maintain impact strength, preventing the profile becoming brittle. It's worth noting that darker colours absorb heat from the sun at a faster rate than lighter colours so over time they will experience a slight fading.
Please also be aware that in particularly hot conditions profiles may distort in shape when used externally. Based on our existing grade of PVC, UV Stabilisers will not prevent this happening and this problem is again exacerbated on the darker profiles such as Black and Anthracite Grey.