uv absorber 3638
Cyasorb 3638, UV 3638 Introduction Cyasorb 3638 offers very strong and broad UV absorption with no color contribution. Possesses very good stabilization for polyesters(PET) and polycarbonates(PC). 3638 is based on a benzoxaxinone structure which delivers a short-term heat stability up to 350 °C and a longterm heat stability up to 160 °C. Chemical Name: 2,2′-(1,4-Phenylene)bis[4H-3,1-benzoxazin-4-one] Synonyms: Cytec Cyasorb 3638…