E642 Addition Cure Molding Silicone Rubber

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The addition cure molding silicone rubber provides lower shrinkage, low viscosity and good fluidity, in addition to all the advantages of the condensation cure RTV silicone rubber. Without releasing any by-product with low molecular weight, the silicone rubber will enable deep curing. 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 enclosed, high temperature conditions.

The molding silicone rubber with good hydrolysis resistant property is applied to 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 E642 Addition Cure Molding Silicone Rubber

Model	Before curing		After curing
Model	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 (%)
E642	Yellowish translucent fluid without apparent mechanical impurity	A:30000±8000 B:6000±2000 A B:10000±3000	A B(1:1) 42±2	A B(1:1) 30±10 or as per customer request	A B(1:1) (25℃) 3±1 or as per customer request	A B(1:1) ≥4.0	A B(1:1) ≥7	A B(1:1) ≥200
E642	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. For demould time testing, component A and B have to mixed evenly in a ratio of 10:1 and then pour the mixture into the aluminum alloy mold; After that, deair it with a vacuum machine, and finally put it into the oven (100℃) until it is cured totally.
2. For the testing of pot life, component A and B should be mixed uniformly at the ratio of 10:1 under room temperature. The pot life refers to the time duration from the mixing of component A and B starts to crosslinking occurs in the mixture.
3. For dynamic viscosity testing, the component A and component B should be put at room temperature for at least one hour respectively, and then mix them completely in the ratio 10:1. Test the viscosity immediately after the component A and B are mixed. For the fast cured type silicone rubber, delayed action activator is required.

E642 Addition Cure Molding Silicone Rubber

Applications of the 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. Additionally, 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.

Packaging, Storage and Transportation of the Addition Cure Molding Silicone Rubber
1. The addition cure molding silicone rubber is usually packed in a clean, dry and sealed metal 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. Meanwhile, keep it away from nitrogen, sulfur, phosphorus, tin, and lead compounds, or metal organic acid salts to ensure superior curing performance.
3. The silicone rubber is NOT subject to the provisions of the IMDG code. It has a shelf life of 18 months from the date of production, but it can still be used after expiration when it is retested and proves to be acceptable.

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