Optical Brightener KCB from Shandong Subang Fluorescence Technology Co.,Ltd is a yellowish green crystal powder with a purity of at least 99%. It features excellent heat resistance, weather resistance, and chemical stability, making it ideal for whitening plastics, synthetic fibers, coatings, and natural lacquers. Its brightening effect is especially notable in materials like PE, PP, PVC, PS, ABS, and polyester fibers. The product is used at low dosages (0.01-0.05 wt%) and is supplied in 25 kg cartons with double-layer PE bags, ensuring safe storage and handling.