Product Description: Specification Condensate cured silicone rubber for mold making, also called condensate curing silicone rubber and tin curing silicone rubber, is a commonly industrial room temperature vulcanized liquid silicone rubber (RTV-2). Areas of use. Condensate cured silicone rubber has a wide application, such as mold making of gypsum, gypsum, concrete, cement, flower pots, candles, soap, resin products, cultural stone, sculpture, GRC/GRG restoration, etc. Technical parameters Model code GTSIL-T10 GTSIL -T15 GTSIL-T20 GTSIL-T25 GTSIL-T30 GTSIL-T40 Hardness Shore A 8-10 14-16 19-21 24-26 28-32 38-40 Viscosity - cP 10000-14000 12000 -16000 14000-18000 16000- 20000 26000-32000 10000-14000 Mixing ratio - % 3% 3% 3% 3% 3% 3% Tensile strength - kN/m2 10-15 15-18 19-23 23-27 25-30 16-20 Tensile strength - MPa 3.5-5.5 3.5-5.5 4-6 4-6 5-7 3.5-5.5 Shrinkage, % 0.30% 0, 30% 0.30% 0.30% 0.30% 0.30% Elongation % 400-500% 400-500% 400-500% 400-500% 350-500% 350-500% How to use 1. Preparation substrates The surface of the original must be clean and free of loose material. If necessary, especially on porous substrates, use a suitable release agent such as petroleum jelly or soapy water.2. Mixing Thoroughly mix Component A (silicone base) before use, as separation of the filler may occur during prolonged storage. Weigh 100 g of Component A (silicone base) and 3 g of Component B (hardener) in a clean container. Stir until the hardener is completely dissolved in the base. Manual or mechanical agitation may be used, but do not agitate for long periods of time and do not allow temperature to rise above 35°C (95°F). Mix suitable small amounts to ensure that component A (silicone base) and component B (curing agent) are thoroughly mixed. It is highly recommended to remove entrapped air in a vacuum chamber, allowing the mixture to fully expand and then collapse. After another 1-2 minutes under vacuum, the mixture should be checked and can be used if there are no air bubbles in it. Vacuum deaeration of the mixture results in an increase in volume by 3-5 times, so a sufficiently large container should be chosen. Note. In the absence of vacuum deaeration equipment, air entrainment can be minimized by mixing a small amount of component A (silicone base) and component B (hardener) and then applying a 1-2 mm layer to the original with a brush. Leave at room temperature until bubbles disappear from the surface and the layer starts to harden. Mix additional base and hardener and follow the steps below to make the final shape.3. Pouring the mixture and curing Pour the mixture of Par A (silicone base) and Part B (hardener) as soon as possible onto the original, avoiding air entrapment. The catalyzed material cures to a flexible rubber within 24 hours at room temperature (22-24°C/71.6-75.2°F), after which the mold can be separated from the original. If the operating temperature is much lower, the curing time will be longer. If the room temperature or humidity is very high, the run time of the catalyzed mixture will be shortened. The final mechanical properties of the mold are achieved within 7 days.