ASA (Acrylo Nitrile Styrene Acrylate): an amorphous polymer belonging to the family of styrene. It can be considered a compromise between ABS and PMMA (but not transparent). The phase of this acrylic polymer confers an intrinsic resistance to UV rays (such as PMMA) combined with a good toughness in terms of impact resistance typical of ABS. Due to these characteristics is chosen in outdoor applications (profiles, elements installed on roofs, parables, parts of the body industry). It requires, in addition to resistance to weathering, even a good mechanical resistance.