Series 5900

They’re pourable, bi-component silicone rubber which vulcanize at room-temperature with a poly-addition process (RTV-2). The mix ratio is 10:1. They don’t contain toxic or corrosive substances and so don’t require particular security measures during the handling. They are used in the field of pad-printing. They have good durability to ageing and atmospheric processes.

After you have homogenized the silicone rubber mix exactly 100 parts of Base and 10 parts of Catalyst. If the proportions are not exactly, the curing times and the final properties can be different. Mix energetically for about one minute until a homogeneous colour is obtained. To reduce air bubbles, we suggest a vacuum de-airing treatment before pouring the silicone rubber, compatible with the curing times. The working time is at least 60 minutes, the demoulding time is less than 24 h. The hardness of silicone rubber decrease by adding silicone fluid. The curing speed is influenced by the temperature. We recommend to work in an isothermal place at 23°C. Higher temperatures accelerate the curing times, lower temperatures reduce them (at 60°C vulcanization time is 1-2 hours). Some inhibitions to vulcanization process may occur when the silicone rubber get in contact with amines, plasticines, metal salts, sulphur, tin catalyst and poly-condensation silicone rubber. To avoid any inhibition problems, we recommend a preliminary test for the compatibility of the silicone on the material to duplicate. We suggest to keep our products in their original packaging, well-closed at a temperature between +7°C and +27°C, in well-aired places. Close always the caps after use. Do not reverse the caps. Put always the counter-caps in their packaging.