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AS40 translucent polyaddition silicone

AS 40 is an addition-cross-linking silicone rubber. This high-quality translucent elastomer offers excellent fluidity and precision in the reproduction of detail. Excellent dimensional stability, low shrinkage, easy mixing with 1:1 ratio, fast curing, outstanding resistance to temperature, ageing and tearing.

 36,18 270,91 HT


AS 40 is a translucent addition-crosslinking silicone rubber. Addition polymerization systems are of the highest quality. They offer excellent dimensional stability, low shrinkage and superior chemical resistance.

The choice of a polyaddition silicone is particularly recommended when the mold needs to withstand a high number of runs.

Its high mechanical strength makes it particularly suitable for industrial-grade molds.

Its base is non-toxic and mixes easily with the corresponding catalyst in a 1:1 ratio.

This silicone can be used to make molds for casting polyester resin, epoxy, polyurethane, plaster, wax, etc., and low-melting metals.

Their high resistance to alkaline constituents also makes them suitable for concrete casting.

AS 40 hardens at room temperature; the higher the room temperature, the faster the setting time.

All our silicones in the “AS” range can be thickened by adding our THIXO silicone polyaddition. The resulting paste texture can be applied to vertical elements with a spatula.


Mixing ratio: 1 : 1

Hardness (shore A): 40

Color: translucent

Pot life at 25°C: 25-30′.

Curing time: 4-6h

Viscosity (mPa.s): 8000 ± 1000

Density (g/cm³): 1.06

Tensile strength (MPa): 7.5 ± 0.5

Tear strength (N/mm): 28±2

Elasticity (%): 450

Contraction (%): <0.1

Storage: Store in a cool, dry, well-ventilated place.


In a clean, dry container, weigh out the quantity of silicone required and calculate a 1:1 addition of catalyst (e.g.: 100gr base + 100gr catalyst).

Using a spatula, thoroughly mix the two components until a homogeneous paste is obtained; using a mechanical mixer, keep at low speed (300 to 500 rpm) for 2 to 3 min. and keep the mixer head in the silicone to limit the incorporation of air bubbles.

After checking that the formwork is watertight, pour the silicone mixture onto the model to be reproduced.

Aim for the lowest point and pour the silicone in a thin vein.

The first coat can be applied directly with a brush, then the rest of the mold can be filled.

Vacuum preparation is possible at a pressure of 0.85 bar for a maximum of 3′.

Demoulding can take place after +/- 6h of hardening at room temperature. The longer you wait before unmolding, the more time the silicone will have had to reach its optimum mechanical properties. In the case of a low-melting metal casting, post-firing is recommended.


Wash your hands and other exposed areas with mild soap and water before eating, drinking or smoking, and when leaving your work area.

Safety data sheets available on request.