Profile: Qingdao Hengze Silica Gel Co., Ltd specializes in providing silica gel products. Our main products include column chromatography silica gel, desiccant silica gel, macro-pored micro-spherical silica gel, water resistant silica gel, and blue silica gel. Orange silica gel main content is silicon dioxide and it can change color to show the relative humidity in the air. It is non-toxic and harmless. The product can be used alone or be mixed with other silica gel to dry and indicate the humidity. It?s widely used in precision instruments, pharmaceutical industry, petroleum industry, chemical industry, and food industry.