High Temperature Resistant Moulding Rubber 500g kit

(Inc. 20% VAT)
(£11.46 Exc. VAT)
In stock

Kit consists of 250g of PART A and 250g of PART B


Total kit volume 438ml

PART A is a grey liquid and PART B is a yellow liquid which are odourless and non-toxic. They react to form a strong, tough, flexible and elastic yellow rubber that resists pouring temperatures of up to 370°C.

The pot life is approximately 8-12 minutes and the cure time is 1-2 hours.


.The two components mix easily with a simple 1:1 ratio and because of the low viscosity can be used without a vacuum chamber. There is practically no shrinkage (0.08%) and excellent reproduction of fine detail.

Primarily used for the casting of low melt alloys for casting military figures, jewellery, model parts and dolls house accessories in lead/tin alloys or pewter. It can also be used for casting resins, waxes, plaster etc.

To view our range of Pewter casting alloys please click here

This product is not suitable for use with food. For a suitable product please click here


For creating a two part mould or moulding a glass object a release agent is required click here


Can be pigmented to a wide range of colours click here


Can be made thixotropic for applying to vertical surfaces or to over head objects click here



 Properties Units  Rubber
Pot Life (25°C) Minutes 8-12
Cure Time (25°C) Hours 1-2
Viscosity (25°C) Mpa.s 25,000
Density (25°C) g/cm3 1.14
Hardness Shore A 45
Linear Shrinkage % 0.08
Tear Strength KN/m 8
Elongation at Break % 200
Tensile Strength Mpa 4.4

pdf-image-white.jpg Technical Data Sheet pdf-image-white.jpg Safety Data Sheet Part A  pdf-image-white.jpg Safety Data Sheet Part B


Polyurethane resin

Epoxy resin *
(* Excl. some epoxies, check with supplier of the resin if silicone moulds are suitable.)

Polyester resin

Acrylic resin

Plastisol (PVC)



Polymer clays (Will inhibit the cure of liquid platinum silicone, see below)



Metals with a pouring temperature below 370°C


A release agent will not create a sufficient barrier to prevent cure inhibition but a layer of paint will. If the paint is solvent based allow sufficient time for the solvent to completely evaporate off as that too can inhibit the cure

Great care must be taken when handling and mixing all addition-cured silicone elastomer systems. All the mixing tools (vessels and spatulas) should be clean and constructed in materials which do not interfere with the curing mechanism. The cure of the rubber can be inhibited by the presence of compounds of nitrogen, sulphur, phosphorus and arsenic; organotin catalysts and PVC stabilisers; epoxy resin catalysts and even contact with materials containing these substances e.g. moulding clays, sulphur vulcanised rubbers, condensation cure silicone rubbers, some printed plastics, onion and garlic.