The final properties will be influenced to some extent by the conditions
under which the material is processed to the final product. For
example, molding at a high temperature improves the gloss and heat
resistance of the product whereas the highest impact resistance and
strength are obtained by molding at low temperature. Fibers (usually
glass fibers) and additives can be mixed in the resin
pellets to make the final product strong and raise the maximum
operating temperature as high as 80 °C (176 °F). Pigments can also be
added, as the raw material original color is translucent ivory to white.
The aging characteristics of the polymers are largely influenced by the
polybutadiene content, and it is normal to include antioxidants in the composition. Other factors include exposure to ultraviolet radiation, which additives are also available to protect against.