Fluorescent brightener OB can be widely used in PVC, PS, ABS, PE, PP and other plastics. It has been widely used in China due to its superior fluorescent whitening effect, good thermal stability and few added amounts. One of the fluorescent whitening agents. It is also suitable for whitening of polyester fibers, paints, paints, inks and acrylics. Fluorescent whitening agent OB can be used in combination with dyes to produce a particular brightness, which is particularly effective in color formulations.