In this second of the series examining considerations for formulating thermoplastic masterbatches, compounds and dispersions, the technical team at Prisma Colour explain the differences between lightfasness and weathering (also known as weatherfastness or durability in some fields).

Detail is also given as to why this distinction is important, the criteria behind the differences, the tests used and a comparison of the light sources is shared.

The choice of equipment and therefore the light energy used can affect the end results radically whether it tests the polymer or the pigments.

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