Silicone rubber ADDV M 4641 TRANSLUCENT (set of two comp.)

• Pourable¹, 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 FDA²

Silicone rubber ADDV M 4641 is an addition-curing, high-performance moulding compound that has been specially developed for mould making. Its main features are its high elasticity and flexibility, which makes it ideal for moulding components with large undercuts. This means that the rubber can easily capture complex geometries and mould details without cracking or deforming. Thanks to its castability, the silicone rubber can also flow into the smallest gaps, which enables high precision in mould production.

Silicone rubber ADDV M 4641 cross-links without shrinkage, which could impair the level of detail.
Plaster and casting resins such as polyester resin, polyurethane resin and epoxy resin are particularly suitable for the production of replicas. To protect the moulds, we recommend using a wax release agent as a protective film (see below for more information). If epoxy resins are processed, we recommend the release spray TRS to insulate the mould surface.

Application:

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.

Processing:

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.

Technical data:

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 %

Additional information:

¹The 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.

²Approval 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.

Delivery:
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.

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.