Silica gel foam is the full name should be called thin-layer chromatography silica gel foam, also known as high-tear-resistant silica gel plate, it is made of high-purity thin-layer chromatography silica gel (powder) mixed with a certain amount of adhesive spray, the plate surface Generally, it is glass, and it is more popular to use aluminum foil as the attachment board in foreign countries. Using high-quality thin-layer chromatography silica gel as raw material, thin-layer chromatography silica gel plates and high-efficiency thin-layer chromatography silica gel plates are made of high-quality thin-layer chromatography silica gel and appropriate adhesives coated on glass substrates , with specified pore volume, specific surface area and pore distribution. Silicone plates on the market are mainly divided into the following types according to the molding process.
1. Extrude the silicone foam.
 
     The extruded silicone sheet is formed by an extrusion molding machine. The extruded silicone sheet, like a ribbon, can be looped together for several meters, and the length can be cut freely.
 
     Advantages: fast maneuverability, low cost, high output, fast production speed, free cutting length, uniform thickness.
 
     Disadvantages: In the later stage, the cooperation of punch and die is required to cut out a specific shape.
 
     2. Shot (injection)
This process has relatively high quality requirements and is a combination of liquid silicone and plastic. Its products are characterized by good thermal stability, cold resistance, excellent electrical insulation performance, and no toxic substances will be produced when burned.
Application fields: It becomes an irreplaceable material in the production design of health products, automobiles, baby products, medical products, diving products, kitchen utensils and seals, etc.
 
     3. Molded silicone foam.
 
     The molded silicone plate is a fixed-size silicone plate formed by high-temperature vulcanization through a silicone mold. The silicone plate has a limited area and a fixed length and width.
 
     Advantages: stable production, good quality of raw materials, color, hardness, good control of raw material grades, consistent size.
 
     Disadvantages: The output is low, the cost is 2-3 times that of extruded silicone plates, and the thickness is uneven.

      4. Perfusion
Filling mold or pouring mold is used for relatively smooth or simple products. There is no mold line to save labor and time. It is to surround the product or model you want to copy with plastic or glass plates, and pour the vacuumed silica gel directly Put it on the product, after the silica gel is dry and shaped, take out the product, and the mold is formed
Application fields: For example, mobile phone cases, luggage cases, etc.
 
    5. Calendering: Silicone rubber is kneaded and kneaded with white carbon black, silicone oil, etc. to make a mixed rubber, and then calendered to form a sheet. The physical and mechanical properties of the film produced by calendering have obvious differences in the longitudinal and transverse directions, and this phenomenon is called the calendering effect.

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