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Addition Cure Molding Silicone Rubber

Addition Cure Molding Silicone Rubber

The addition cure molding silicone rubber is applicable for making moulds for the same fields of RTV-2 mold making silicone rubber. In addition, it is particularly ideal for the duplication of large stone, plaster and cement products as well as the products with very complicated patterns due to its low viscosity, good tensile and tear strength, and excellent operability.

Our addition cure molding silicone rubber doesn't release any by-product with low molecular weight, so it offers good curing performance. The addition cure molding silicone rubber eliminates problems of degradation or sticky molds which are caused by the by-product or rather small molecules under specific conditions such as enclosed, high temperature conditions. The molding silicone rubber is suitable for making all kinds of molds in a variety of sizes and complicated shapes, as well as large sized plaster, stone and cement molds, etc.

Technical Data of the E620 Addition Cure Molding Silicone Rubber

Model Before curing After curing
Appearance Dynamic viscosity (Cp) (25℃) Hardness (Shore A) Pot life (mins) (25℃) Demould time (hrs) Tensile strength (Mpa) Tear strength (kn/m) Elongation at break (%)
E620 Yellowish translucent fluid without apparent mechanical impurity A:27000±5000 B:3500±1000 A+B:6000±1000 A+B(1:1) 20±2 A+B(1:1) 30±10 or as per customer request A+B(1:1) (25℃) 4±1 or as per customer request A+B(1:1) ≥2.5 A+B(1:1) ≥12 A+B(1:1) ≥400
1. Keep sample at room temperature for at least one hour before you take a proper amount of it for testing. Put A and B under room temperature for one hour respectively, and then mix them evenly in the ratio 1:1. Test the viscosity immediately. (For the fast cured type addition cure molding silicone rubber, delayed action activator is required.)
2. Thickness of the cured test sheet should be no less than 6mm.
3. Mix A and B evenly at a ratio of 1:1 under room temperature, and record the time when crosslinking reaction occurs in the mixture.
4. The test sheet is initially vulcanized with the thickness at least 2cm, and it can be restored after extrusion. The cured sheet is made to offer standard mechanical property, which is tested by an electronic universal testing machine.

Note
1. Viscosity testing: put component A and B under room temperature for at least one hour respectively, and then mix them completely in the ratio 10:1. Test the viscosity immediately (For the fast cured type, delayed action activator is required.).
2. Testing of pot life: mix A and B evenly in the ratio of 10:1 under room temperature, and record the time when crosslinking reaction occurs in the mixture.
3. Demould time testing: mix component A and B evenly at a ratio of 10:1, and pour the mixture into the aluminum alloy mold. Deair it with a vacuum machine, and then put it into the oven (100℃) until it is cured totally.

Packaging, Storage and Transportation of the Addition Cure Molding Silicone Rubber
1. Usually the addition cure molding silicone is packed in a clean, dry and sealed pail with big and round mouth, in 1kg/pail, 5kg/pail, 20kg/ /pail, and 200kg/ pail. The Part A and Part B are packed separately.
2. Keep the addition cure molding silicone rubber in a cool and dry place. It should be specially noted that the lifecasting silicone should not touch or mix with nitrogen, sulfur, phosphorus, tin, and lead compounds, or metal organic acid salts. Otherwise, the catalyst will be poisoned, and then the silicone can not be cured or just partially cured.
3. The silicone rubber is NOT subject to the provisions of the IMDG code. The shelf life is 18 months from the date of production. And the product can still be used after expiration when it is retested and proves to be acceptable.

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Silicone Rubber
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