![]() This eliminates entrapped air within the mixture and helps ensure a void-free end product.ĭue to the viscous and sometimes sticky nature of the finished batch, a Ross Discharge System is commonly used to quickly transfer the material out of the mix vessel, a technique that also enables easier clean-up between runs. ![]() Another option is the step-wise addition of components which involves pulling vacuum before mixing is resumed. The low-viscosity crosslinker may be added slowly through a charge port as the agitators continue to rotate. Solid fillers such as fumed silica, microspheres, ceramic additives, carbon black or other pigments are then charged into the batch in increments. 6,652,137) are particularly ideal for handling peak viscosities up to 6 million cP.Ī typical procedure begins with establishing a uniform consistency of the viscous base which could be a blend of two silicone polymers. Heavy-duty Ross Double Planetary Mixers equipped with High Viscosity "HV" Blades (US Patent No. The blades contact virtually every point of the batch and impart a very thorough mixing action even when the product is not free-flowing. This type of mixer kneads viscous pastes or semi-solid gels by rotating two identical blades on their own axes as they orbit on a common axis. Room temperature vulcanizing (RTV) and high temperature vulcanizing (HTV) silicone elastomers are proven applications of the Ross Double Planetary Mixer. The starting viscosity of the polymer base, the maximum viscosity reached by the mixture, and the final viscosity of the silicone rubber are all important considerations. Mixer selection is based on a number of factors but primarily viscosity and shear input. Silicone elastomers differ by curing mechanism as well as viscosity during processing. Also commonly called silicone rubber, this type of elastomer consists of crosslinked silicone polymers typically filled with additives to achieve desired physical and chemical properties. ![]() Silicone elastomers are highly versatile materials used in making various end products, from automotive gaskets and power cables to sanitary tubings and medical implants.
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