Silicone Rubber - Polytek Platsil - Liquid Silicone Platinum Cured

Silicone Rubber - Polytek Platsil - Liquid Silicone Platinum Cured Polytek® manufactures a full range of two-part, room-temperature curing silicone rubbers that offer great flexibility, tear strength, chemical resistance, and release properties. Silicone molds can be used to cast a variety of materials, including polyurethane, polyester and epoxy resins, polyurethane foam, plaster, wax, concrete, low melting metals, and more. One of the primary advantages of using silicone mold rubbers instead of other flexible materials, like polyurethane rubber, is that release agent is not needed when casting polyurethane resins, foams and other materials into silicone molds. This is especially important when cast parts need to be painted as paint will not adhere well to parts with residual release agent. **We often get asked how much is in a kit, and the answer is below under each product's 'Specific Volume'-- But, to simplify, if 1lb of material has a volume of 25 cubic inches, that is just under the size of a 3" x 3" x 3" cube, which is 27 cubic inches (picture a Rubik's Cube) Polytek® manufactures two different types of silicone rubbers: platinum-cured (PlatSil®) silicones and tin-cured (TinSil®) silicones: There are distinct qualities that each line offers and their primary differences are: TinSil® silicones are condensation-cure systems that shrink slightly on cure (~1%) compared to addition-cure PlatSil® silicones, which do not shrink on cure. Cured TinSil® silicones have shorter library life (2 to 5 years total) compared to PlatSil® silicones. TinSil® silicones are slightly less expensive than PlatSil® silicones. Liquid PlatSil® silicones are more sensitive to certain materials (e.g., sulfur, tin compounds, Bondo) and suffer from cure inhibition (uncured surface material) more often than TinSil® silicones. Cured TinSil® molds can inhibit some casting materials, including PlatSil® silicones, Poly-Optic® Clear Casting Resin and many polyurethane rubbers. There are skin-safe platinum-cured silicones available in the PlatSil® product line: PlatSil® Gels. PlatSil (Plastinum Care) Silicone Rubber: Use PlatSil® Liquid Silicone Rubbers to make your own silicone molds and silicone parts. PlatSil® rubbers are platinum-cured (also known as addition-cure), room temperature-curing silicones (RTV) that are used to make flexible, high-strength molds and parts. PlatSil® molds are often selected over other mold materials (e.g., polyurethane rubbers) because of their excellent release properties. They also exhibit long library life and low shrinkage on cure compared to other mold material options. PlatSil® molds are excellent for casting polyurethane, epoxy and polyester resin, polyurethane foam, wax, plaster, soap, concrete, and more. Release agent is generally not needed to cast any of these materials. These rubbers are commonly used in Sculpture & Foundry, Prototyping, Architectural Reproduction & Restoration, Foam, Plastic & Plaster Millwork & Ornamentation, Theming & Display, Candle Making, Craft & Hobby projects, and some Concrete Casting applications. PlatSil Features: Two-part platinum-cured (addition-cure) silicone rubbers Room temperature curing (RTV) Shore Hardness Options: A10-A60 Do not exhibit shrinkage upon curing so they are useful for casting dimensionally stable parts for highly accurate prototyping and model making applications Molds do not require release agents when casting most materials Cured molds have a long library life Pourable or brushable (thicken with PlatThix liquid thickener or Fumed Silica) High-strength Excellent chemical resistance Reproduces fine details Can be accelerated for rapid cure Ideal for the most demanding resin casting applications NOTE ON CURE INHIBITION: Sulfur/tin/amine-contaminated materials and tools will cause cure inhibition in platinum-cured silicone rubbers, which means that the rubber that is in contact with the contaminated surface will remain gummy or uncured. Make sure to test cure the rubber on your surface before full-scale application. Use a polyurethane or tin-cured silicone rubber if you know that you’ll be working with any of these inhibitors. PlatSil® 71 & 73-Series Silicone Rubbers Listed below in order of hardness (softest at top). Standard, platinum-cured mold making and casting silicone rubbers. PlatSil® 71 & 73-Series Technical Bulletin (TDS) PlatSil® FS-Series Technical Bulletin (TDS) PlatSil® Gel Series Technical Bulletin (TDS) PlatSil® Safety Data Sheet (SDS) PlatSil® FS-Series Safety Data Sheet (SDS) Product Mix Ratio by Weight Shore Hardness Pour Time Demold Time Cured Color SpecificVolume MixedViscosity ShrinkageUponCure PlatSil® 71-11 1A:1B A10 20 min. 4 hr. Blue-Green 24.7 in³/lb 6,000 cP Nil PlatSil® 73-15 1A:1B A15 20 min. 4-5 hr. White Translucent 25.0 in³/lb 2,500 cP Nil PlatSil® 73-20 1A:1B A22 5 min. 1 hr. Blue Translucent 25.0 in³/lb 3,000 cP Nil PlatSil® 71-25 1A:1B A25 35 min. 16 hr. Milky White 25.0 in³/lb 3,500 cP Nil PlatSil® 73-25 1A:1B A25 15 min. 4-5 hr. Green 24.3 in³/lb 6,000 cP Nil PlatSil® 73-29 1A:10B A30 45 min. 16 hr. White 25.0 in³/lb 15,000 cP Nil PlatSil® 71-40 1A:10B A40 90 min. 24 hr. Translucent 26.6 in³/lb 38,000 cP Nil PlatSil® 73-40 1A:10B A40 45 min. 16 hr. Yellow 22.0 in³/lb 25,000 cP Nil PlatSil® 73-45 1A:10B A45 40 min. 16 hr. Green 21.3 in³/lb 35.000 cP Nil PlatSil® 73-60 1A:10B A60 45 min. 16 hr. Blue 21.3 in³/lb 40,000 cP Nil PlatSil® FS-10 1A:1B OO60/A13 8 min. 25 min. Milky White 24.9 in³/lb 4,200 cP Nil PlatSil® FS-20 1A:1B OO66/A20 8 min. 25 min. Milky White 24.9 in³/lb 3,800 cP Nil PlatSil® Gel-OO20 1A:1B OO20 40 min. 2 hr. Milky White 26 in³/lb 3,900 cP Nil PlatSil® Gel-OO30 1A:1B 0030 45 min. 4 hr. Milky White 26 in³/lb 6,200 cP Nil PlatSil® Gel-OO 1A:1B 0030 6 min. 30 min. Milky White 25 in³/lb 22,000 cP Nil PlatSil® Gel-10 1A:1B A10 6 min. 30 min. Milky White 25 in³/lb 15,000 cP Nil PlatSil® Gel-25 1A:1B A25 5 min. 60 min. Milky White 25 in³/lb 3,500 cP Nil PlatSil® 71-11 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a blue-green, Shore A10 rubber. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 73-15 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a white translucent, Shore A15 rubber. The transparent nature of the cured rubber makes it a good option for molds that need to be cut after cured – because the model is visible, parting lines can be better determined. It is also very useful when casting intricate parts to ensure that the entire mold cavity has been filled with casting material. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 73-20 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a blue translucent, Shore A20 rubber. Compared to other silicones in the PlatSil® 73-Series line, this option sets quickly with a demold time of 1 hour (at room temperature). The transparency of PlatSil® 73-20 is useful for molds that need to be cut after cure – parting lines can be better determined because the model is visible. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 71-25 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a milky white, Shore A25 rubber. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 71-25 has been tested by an independent laboratory and was found to comply with 21 CFR 177.2600 (as published in the Code of Federal Regulations) for rubber articles intended for repeated use food contact surfaces when accurately measured, thoroughly mixed, and fully cured. Review our Food-Related Applications Technical Bulletin. PlatSil® 73-25 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a green, Shore A25 rubber. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. The yellow colored Part A and green colored Part B make it easy to see when mixing is complete. A uniform, light, lime-green color means you’re good to go! PlatSil® 73-29 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a white, Shore A30 rubber. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 71-40 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a translucent, Shore A40 rubber. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 73-40 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a yellow, Shore A40 rubber. Since PlatSil® 73-40 has no shrinkage upon curing and resists mold distortion due to casting, it is an ideal product where dimensional stability is required. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 73-45 Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone system that cures (RTV) to a green, Shore A45 rubber. This is a pourable rubber, but it can be easily thickened with PlatThix Liquid Thickener or Fumed Silica for brush-on application. PlatSil® 73-45 has been tested by an independent laboratory and was found to comply with 21 CFR 177.2600 (as published in the Code of Federal Regulations) for rubber articles intended for repeated use food contact surfaces when accurately measured, thoroughly mixed, and fully cured. Review our Food-Related Applications Techni