Medical liquid silicone application

Medical liquid silicone is also commonly known as two-component room temperature vulcanization addition silicone. Silicone rubber components A and B are both flowable liquids, and component B contains platinum catalyst or other additives. After mixing the two components, it can be cured at room temperature or heated. Can be used for the following aspects:

1. Manufacture of precision molds for metal artworks, alloy vehicles, etc.;
2. Molding of epoxy resin, polyester resin, polystyrene, vinyl plastic, paraffin and other materials;
3. Mold manufacturing of large cement components, cultural stone, concrete, precision parts, glass fiber reinforced plastic products and other products;
4. Design and manufacture of high-precision hand model, rapid prototyping design.
5. Manufacturing of dental molds, medical products, silicone wax figures, silicone dolls, silicone products, silicone parts, silicone seals, silicone sheets, etc. silicone products and molds.

the Characteristics of medical liquid silicone

1. Not limited by the thickness of the product, it can be deeply vulcanized;
2. The shrinkage rate is less than one thousandth, the low molecular weight is not released during the cross-linking process, and the copied product has high accuracy;
3. It has excellent chemical corrosion resistance and high temperature resistance, which can reach 300 ℃;
4. Food grade, non-toxic and tasteless, passed FDA food certification;
5. High stretch and high tear resistance, many times of turning over molds, not easy to deform;
6. Good fluidity, easy to pour, can be cured at room temperature or heated, and easy to operate.

Performance parameters of medical liquid silicone

Addition mold compound model Q 620 Q 630 Q 640

Appearance (Part A) Transparent Transparent Transparent

Appearance (Part B) Transparent Transparent Transparent

A, B component ratio 10: 1 10: 1 10: 1

A component viscosity (10,000 CPS) 8.5—9 8.5—9 8.5—9

Operation time ( 25 ℃ /h ) 1 1 1

Vulcanization condition 60 ℃ / h 2 2 2

70℃/h 1.5 1.5 1.5

Density (g/m3) 1.1 1.1 1.1

Hardness (JIS A) 35 35 40

Elongation (%) ≥350 ≥350 ≥350

Tear strength (KN m-1) ≥20 ≥20 ≥20

Linear shrinkage (%) <0.1 <0.1 <0.1

Note: The colloid viscosity, color, transparency, hardness, etc. in the parameter table can be adjusted according to the needs of customers.

the Production method of silicone mold

1. Prepare a container and a mixer or a stirring rod, for example: use two utensils of the same capacity, measure the two components of component A and component B in the container in the same way, and then measure the two components of A/B. Pour the glue into the same large container and stir evenly. The appearance of the mold silicone is a flowing liquid. The A component is the silicone rubber with curing components, and the B component is the silicone rubber.
2. It is best to vacuum the stirred silicone rubber with a vacuum machine.
3. Pouring or brushing operation process: Evacuate the silicone rubber that has been evacuated from the bubbles, and pour the silicone rubber on the product by pouring or brushing.
4. Precautions for the use of medical liquid silicone

Summary

The ratio of medical liquid silicone rubber is 1:1. Attention should be paid to the addition-type silicone rubber during use: it should not be in contact with the condensed silicone rubber, otherwise the silicone rubber will not be cured.

Obviously, there are many more properties of liquid silicone rubber that deserve more discussion. As a professional medical silicone molding manufacturer, Newtop is always ready to help you. If you want to know more about medical liquid silicone, please contact the engineering team of Newtop medical immediately, we will help you solve your questions and provide the best service to meet your needs.