RTV silicone rubber is divided into two types: molding and condensation:

The raw material and formula are silicone rubber with special mould. The product is sold in the form of double packaging. The A component is rubber material and the B component is catalyst. To consider room temperature, mold strength and hardness, in order to determine the weight of AB component preparation ratio.

At room temperature of 20-25 degrees, A: B= 100:1.5. When the chamber is low (but not lower than 10 degrees), increase component B by 0.1-0.3. When room temperature was higher, 0.1-0.3 were reduced in group B. The specific method is to determine the total amount according to the volume of the mold, and then weigh the A and B components accurately according to the proportion, and place them in A vessel to stir evenly, which is finished.

Mould making: mix the good material, pour into the clean object to be imitated. In order to save materials, the thinner mold, can also be divided into brushing. To increase the mold tension can be pasted gauze and so on. It solidifies into an elastomer in 2 hours at room temperature of 20 degrees and can be used in a day.

Notes for making silicone rubber mould:

1, B component is the catalyst, easy to be hydrolyzed by moisture, so after use should be covered tightly.

2, A, B once mixed, chemical reaction; Start immediately, the viscosity gradually rises, can not stop, in order to avoid waste, should be based on the dosage, with the use of the match, should be used immediately after the match, without delay.

3. The mix ratio of group A and B is related to the speed of chemical reaction and the performance of the mould. The more B component, the faster the reaction, the strength and hardness of the product is higher, but the toughness decreases. Therefore, accurate weighing requirements.

4. Before preparation, the A component material should be mixed evenly and weighed again.

5, casting method is suitable for relief class, brushing method is suitable for the production of three-dimensional mold. The casting relief mold should first make the length and width of the original length and width of 4-6cm each frame. The border should be flat and the inside should be smooth. Place the frame on a clean glass plate when pouring, and then place the original in the frame, leaving a gap of 2-3cm on each side

There are bubble solutions in the production process:

• Improved flanging slot and exhaust system design

• Increase the pressure of the press

• Reduce the amount of release agent and spray evenly

• Material moisture control

• Try adding antifoam

• Use cold runner

• Vacuum pumping with a vacuum machine, the mold can be added to the exhaust operation.