Irgacure 819 Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide 162881-26-7 Ciba Photo Initiators Polyesters ADHESIVE >> Radiation Curing (UV/EB) Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide IRGACURE 819 is a versatile photoinitiator for radical polymerisation of unsaturated resins upon UV light exposure. It is especially suited for white pigmented formulations, the curing of glass fiber reinforced polyester/styrene systems and for clearcoats for outdoor use in combinations with light stabilizers. Thick section curing is also possible with this photoinitiator. IRGACURE 819 may be used, after adequate testing, in UV curable formulations for clear and for pigmented coatings on wood, metal, plastic, paper and optical fibers as well as for printing inks and prepregs. For patent reasons, however, the use of this product is not allowed in dental applications. IRGACURE 819 exhibits at low concentrations an outstanding curing performance in highly opaque white and colored furniture coatings or screen inks containing rutile titanium dioxide or colored pigments and affords minimum yellowing after exposure to sufficient amounts of UV radiation. Additionally the outstanding absorption properties of IRGACURE 819 allow curing of thick sections. IRGACURE 819 can be used in combination with other photoinitiators such as IRGACURE 184 or IRGACURE 651. With the latter it is especially suited to cure poyester/styrene resins as used for glass reinforced materials. Due to its photosensitivity at longer wavelengths, IRGACURE 819 can easily be used in combinations with UV absorbers, e.g. TINUVIN Ò 400. It is therefore ideally suited for use in weather-resistant UV curable coatings. Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide. Used as a photoinitiator for radical polymerisation of unsaturated resins upon UV light exposure. Exhibits outstanding curing performance and outstanding absorption properties at low concentrations. Possesses photosensitivity at longer wavelengths. Can be used in combination with other photoinitiators, UV absorbers.