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ELASTOSIL® M 4601 US A/B
Pourable, addition-curing, two-component silicone rubber that vulcanizes at room temperature.
Properties
- Fast and non-shrink cure at room temperature which can be accelerated considerably by the application of heat
- Low Shore A hardness (approx. 28)
- High tear strength
- Excellent long-term stability of the mechanical properties of the cured rubber
- Outstanding resistance to common casting resins particularly polyurethane
Due to the outstanding resistance to casting resins as well as the superior mechanical properties, ELASTOSIL® M 4601 US A/B is especially suitable for all molds of models with extensive undercuts that are to be reproduced in casting resins.
As a low-Shore addition-curing RTV-2 silicone rubber that cures without undergoing dimensional shrinkage, ELASTOSIL® M 4601 US A/B is also extremely suitable for casting all other common reproduction materials, particularly if absolutely accurate copies of models with pronounced undercuts are required.
Important
The platinum catalyst is contained in component B.
Caution
Only components A and B with the same lot number
may be processed together!
To ensure both optimum flow and homogeneity of the material, the components must be stirred thoroughly before they are removed or processed in their containers, in order to uniformly disperse any fillers that might have settled during storage.
The tables below indicate the pot lives and curing times at various temperatures.
The pot life figures indicate the time required for the mix to reach a viscosity of 60 000 mPa s.
The curing times apply to a layer thickness of 1 cm.
Thin-walled molds are best suited for casting lowmelting metal alloys (melting point: 300 °C max.) and
should be placed on a sheet of aluminum or other material with high thermal conductivity.
Before the casting process, the mold should be postcured for a few hours at about 150 °C. In order to
improve wetting by the molten metal, a thin layer of extremely fine silicone carbide, graphite powder or
acetylene black should be applied to the mold surface.
The first castings normally have to be discarded since the rubber still emits gases, giving the surface of the
casting a pockmarked appearance.
Comprehensive instructions are given in our leaflet "Wacker RTV-2 Silicone Rubber - Processing."
Detailed information on other mold-making compounds in the ELASTOSIL® M range is contained in our
brochure “ELASTOSIL® M. Mold-Making Compounds For Maximum Precision”.
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