1, nano-silica gel: it is a natural environment-friendly material, derived from natural ingredients in natural sand and stone crystals, free of bisphenol A and plasticizer, non-toxic, odorless, environmentally friendly, safe and hygienic.

2. wacker Silica Gel: WACKER is a well-known German chemical company and one of the world's leading manufacturers of silicone materials. Its silica gel products meet the multiple food-grade certifications of European standard, American standard and national standard.