Processed works with silicone as the main raw material are called silicone products. Silica gel is a porous material of different particle sizes that is suitably dehydrated from silicic acid gels. Has an open porous structure, can absorb many substances, is a good desiccant, adsorbent and catalyst carrier. Adsorption of silica gel is mainly physical adsorption, which can be regenerated and used repeatedly. The acid is added to a solution of an alkali metal silicate (e.g. sodium silicate) to acidify it, and then a certain amount of electrolyte is added for stirring to generate a silicate gel; or in a more concentrated sodium silicate solution, an acid or Ammonium salts also produce silicic acid gels. Silicate gels are allowed to stand for a few hours to age, then the soluble salts are washed with hot water, dried at 60-70 ° C and activated at about 300 ° C to give silica gel. Silica gel with cobalt chloride solution soak after drying and activation, can be color silica gel.
Food grade silica gel is non-toxic and tasteless, insoluble in water and any solvent. It is a highly active green product. Food grade silica gel has inherent thermal stability (-40°C-230°C). It is suitable for different occasions. The product has a good flexibility to meet different needs.