Gypsum Sculpture Molds Making RTV Silicone Rubber

Gypsum sculpture molds making rtv silicone rubber description

Gypsum sculpture molds making rtv silicone rubber (room temperature vulcanizing silicone) is a type of silicone rubber made from a two-component system (base plus curative; A+B) available in a hardness range of very soft to medium - usually from 15 Shore A to 40 Shore. RTV Silicones can be cured with either a platinum catalyst or a tin catalyst. Applications include low temperature overmolding, making molds for reproducing, and some optically clear grades have lens applications.

Features of Gypsum sculpture molds making rtv silicone rubber

Good characteristics of easy-operation
Light viscosity and good flowability
Low shrinkage
Favorable tension
No deformation
Favorable hardness
High temperature resistance, acid and alkali-resistance and ageing resistance

Operation instructions for making a mold by Gypsum sculpture molds making rtv silicone rubber

Correct mixing ratio
Component A is silicone rubber, and component B is curing agent or vulcanizing agent. Usually the mixing ratio will be 2-3%, e.g. to 100g silicone rubber should be added 2g catalyst and then mix them thoroughly. (Note: the weight of the silicone and catalyst should be weighed correctly).

 
Preparation of the original molds
Because Gypsum sculpture molds making rtv silicone rubber reproduces the surface texture of the original model exactly, the surface of the original to be molded must be finished: all faults must be removed, and it must be sanded or polished to the desired smoothness. If a smooth finish on the final casting is desired, the original must be polished. For a matte finish, polishing is not necessary.

  Gypsum Sculpture Molds Making RTV Silicone Rubber

Vacuum-pumping process
To mix the silicone and catalyst with a standard mixing ratio and then do the process of Vacuum-Pumping. Bubbles will come out during the mixing of the silicone and hardener, if without Vacuum-Pumping, the bubbles cannot be released from the mixture, as a result, there will be many bubbles in the finished silicone mold. Then the mold has a less tensile strength which will affect the reproduction times. Such an unsmoothed silicone mold will affect the quality of the production directly.

Advantages of Gypsum sculpture molds making rtv silicone rubber  

Gypsum sculpture molds making rtv silicone rubber has the best release properties of all the mold rubbers, which is especially an advantage when doing production casting of resins (polyurethanes, polyesters and epoxy). No release agent is required, so there is no post-production cleanup. Silicones also exhibit very good chemical resistance and high temperature resistance (400°F / 205°C and higher). High temperature resistance makes silicone the only mold rubber suitable for casting low melt metal alloys (e.g. tin, pewter, lead). The combination of good release properties, chemical resistance and heat resistance makes silicone the best choice for production casting of resins.

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