TinSil® 70 Series RTV Silicone Rubbers are condensation-cure, tin-catalyzed, flexible mold rubbers. TinSil products consist of a liquid Part B base and Part A accelerator, which, after mixing at the proper ratio by weight, cure at room temperature to rubber with a tough, knotty tear property. TinSil molds have easy release properties and are resistant to high temperatures. TinSil molds are excellent for casting polyesters, epoxy and polyurethane resins, waxes and many other materials.
As with other Polytek® elastomers, the last two digits in the product name indicate the approximate Shore A hardness of the cured rubber. Choose the appropriate hardness of rubber for your application.
• TinSil 70-11, 70-20 and TinSil Gel-10 are soft and, therefore, best for delicate castings. TinSil Gel-10 is translucent and especially useful for animatronics and special effects.
• TinSil 70-25 and 70-30 are Polytek’s most popular and versatile, mid-range hardness, silicone rubbers.
• TinSil Brush/Spray-25 are brushable or sprayable or and can be applied by hand or sprayed with a low-cost Plas-Pak spray gun or more sophisticated 1A:10B silicone spray equipment. Spray 25 is great for large scale blanket molds!
• TinSil 70-60 is stable at higher temperatures making it suitable for casting low melting metals. TinSil 70-60 has limited tear strength because of its hardness.