6 China 
2 India 
1 Germany 
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optical windows coatings Photos Catalog - page 71 - WorldBid B2B Market
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Optical Brightener ObsChemicals - TIANJIN LEADING IMPORT & EXPORT CO., LTD - China - May 28, 2026 - 1.00 Dollar US$1. Applications: Optical Brightener OB can be used for whitening thermoplastics, PVC, PS, PE, PP, ABS, acetate fibre, paint, coating, printing ink, etc. It can be added for whitening at any stage of process of polymers and can give the finished produ...