播放中国国产国语纯一级黄片免费看, 大鸡吧快来啊阿啊阿啊黄片在线播放, 中文精品日韩网站在线观看视频免费, 别揉我奶头~嗯~啊~一区二区三区,AV无码播放一级毛片免费古装,亚洲春色一区二区三区,91大神极品,美国一级大黄一片免费下载,午夜爽爽爽男女免费观看软件

  1. 首頁(yè)
  2. 化工助手
  3. 化學(xué)配方數(shù)據(jù)庫(kù)
  4. LEATHER
化學(xué)配方數(shù)據(jù)庫(kù)
配方類(lèi)型： LEATHER
配方說(shuō)明： Leather Bleaching
配方組成：
配制方法： Hydrogen peroxide is a satisfactory bleaching agent for various kinds of leather. A typical bleaching solution is 0.3 to 0.6% or 1 to 2 volumes hydrogen peroxide made slightly alkaline with tetrasodium pyrophosphate, sodium silicate, or ammonia. The operation should be carried out at a temperature as low as possible consistent with good bleaching and should not exceed 120F. The time of bleaching should be as short as possible.

返回?cái)?shù)據(jù)庫(kù)查詢(xún)
QQ: 2241752642
微信二維碼
電話(huà): 19906633110