国产高潮精品一区二区三区av ,中文字幕精品一区二区日本,丝袜美腿爆炒国产在线观看,久久精品成人91一区二区,国产亚洲自在精品久久,亚洲av永久久无久之码精,久久国产成人精品av,亚洲国产欲色有一二欲色,亚洲一区二区成人在线视频,懂色av一区二区三区免费观看

Product physical and chemical properties
Blue-white, white or light yellow crystal powder; soluble in most solvent;
Melting point: ＞300℃;
Appropriate for chemical fiber fluorescent whitening agent;
Features: fine whitening effect, no fluorescent, fine brightness
Packing, storage and transportation
Fiber can package, 25kg or according to customer requirements;
Prevent damage and moisture;
Please do not mixing transported with oxidizing agent;