Silicone rubber ADDV M 4641 is a high-performance cast mould mass particularly suitable for the reproduction of models with undercuts using polyurethane and epoxy resins. For epoxy resins, we recommend using Release spray TRS to isolate the mould´s surface.

• Pourable*, addition-curing two-component silicone rubber with high extensibility (approx. 300 %)
• Good transparency of the vulcanisate
• Fast, shrinkage-free vulcanization at room temperature
• Superior tear strength and tear propagation strength
• Medium hardness (Shore A 43)
• Very high resistance to casting resins, in particular polyurethane and epoxy resins, for a large number of demouldings
• Heat-resistant up to 180 °C
• Suitable for food contact in accordance to BfR and FDA

*The system can be poured despite the high viscosity. For perfect castings without air bubbles we recommend pouring under a vacuum. Under vacuum the enclosed air escapes, so the silicone contains only a few to no air inclusions.

Due to the good transparency of the vulcanized silicone it is possible to see -inside the mould when casting the reproductions. One of the main uses is vacuum casting for rapid prototyping.

As both component batches are matches to each other, we only supply complete batches. It is not possible to obtain individual deliveries of silicone and hardener.

• Mixing ratio: 10 : 1 component A : component B
• Processing time: 90 minutes
• Removable from the mould at 23 °C: after 15 h, at 70 °C after 30 min
• Continuous temperature resistance: 180 °C

No heat of reaction occurs during vulcanization so that even larger quantities (e.g. 10 kg) can be poured without the risk of overheating.

If heat is added during curing (e.g. in a heating cabinet or oven), the vulcanization time is reduced by half at a temperature increase of each 10 °C. The heat thus accelerates the cross-linking reaction. The maximum recommended curing temperature is 70 °C.

• Colour: Translucent
• Mixing viscosity: 30.000 mPa·s
• Density: 1.07 g/cm³
• Shore A hardness: 43
• Tensile strength: >4.5 N/mm
• Elongation at break: 300 %
• Tear strength: > 25 N/mm
• Linear shrinkage after 7 days at 23 °C: < 0.1 %

Customer information:
Small quantities, up to 25 kg, are specially bottled and are offered as R&G-brand. 25 kg and bigger are sold in the original container with the original label from Wacker ELASTOSIL®-Silicone.

The release agent Semiperm™ Monofilm in combination with PARTALL® Coverall Film PVA is suitable as a safe release agent for silicone moulds. This combination of release agents provides a barrier layer so that casting with epoxy resins is also possible without any problems. The service life (durability) of the molds is significantly extended.
The release agent Semiperm™ Monofilm is applied with a brush. After flash-off, PARTALL® Coverall Film PVA is applied, also with a brush or sponge. For more information on processing, see the release agents.
PARTALL® Coverall Film PVA is transferred to the casting, washed off with water after demolding and reapplied before each impression.

*Approval by the Food and Drug Administration for food production (source: Reichelt Chemietechnik)
The Food and Drug Administration has very strict requirements for food produced in or imported to the United States. These measures were adopted to prevent national disasters caused by contaminated or polluted food. Only companies that work in accordance with FDA and whose materials are certified accordingly are allowed to serve the US market.

FDA-compliant requirements make materials necessary that have a long shelf life and do not release any ingredients into the food. In the food sector, a large number of plastics with fundamentally different properties are used and come into contact with food. All these plastics must be FDA-compliant and their requirements selected accordingly.