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1. What are the mixing ratios for injection molding silicone rubber? What viscosity do customers usually require?

Answer: The common ratio for two-component A:B injection molding silicone rubber is 1:1; and the 1:1 ratio is the easiest to operate and inject. 2. Customers will require hardness (from 10°~~80°), and the viscosity is generally between (30~120 million).

2. What aspects are involved in the parameters of injection molding silicone rubber? Can the company provide written parameters?

Answer: Tensile strength, hardness, viscosity, elongation, compression set, rebound resilience, tear strength, etc.

3. What problems do customers usually encounter when using injection molding silicone rubber? How to solve these problems?

1. Incomplete vulcanization, too long vulcanization time Reason: Low mold temperature, long vulcanization time High mold temperature, fast vulcanization time Generally, the mold temperature is controlled at a minimum of 150 degrees and a maximum of 180 degrees. The vulcanization time of silicone rubber is related to the size of the product: The smaller the product, the shorter the vulcanization time of the silicone rubber The thicker the product, the larger the mold, the longer the vulcanization time of the silicone rubber.

2. Why does the product change color after silicone molding? All silicone will oxidize over time after molding. In colored silicone products, oxidation is usually not visible. (Antioxidants may be added to liquid rubber in the future)

3. What hardness of silicone rubber should be chosen? Silicone rubber products should choose different hardness of silicone rubber according to the size and size requirements of the product to meet customer requirements. The general hardness is between 10 and 80 degrees. Products with hardness below 10 have low tear strength, but high elongation and large deformation. Products with hardness greater than 70 also have poor tear strength, the silicone will become brittle, and it is easy to break or fracture. Generally, when the hardness of silicone rubber is 30-50, the tear strength and tensile strength are the best, including elongation, rebound resilience, and physical properties are in the best state.

4. What are the common packaging methods for injection molding silicone rubber? What is the usual shelf life?

Answer: How long is the service life of the finished product? Usually 20kg (sample), 200kg iron bucket; the maximum shelf life is 6 months;

5. Can condensation silicone rubber be used for injection?

Answer: Injection silicone rubber does not necessarily require an injection machine, but condensation silicone rubber cannot be used for injection molding, because: the proportion of the curing agent is too small, the injection machine is difficult to inject evenly, and most importantly, heating will cause the product to become sticky and not dry.

6. In the operation process of injection molding silicone rubber, can appropriate pigments be selected according to the customer's product requirements to prepare various colors for customer use?

Answer: Silicone rubber can be colored, but for addition-type silicone rubber, appropriate pigments should be selected during the coloring process. Some pigments will poison the addition-type silicone rubber, and the silicone rubber will not vulcanize, such as: organotin-containing: N, P, S, heavy metal pigments. Injection rubber is also addition-type silicone rubber. Injection molding silicone rubber: product shrinkage rate 1% (heating 80℃-220℃, high temperature will cause changes in the product shrinkage rate).