1-2-1 Easy Mould 250g kit

(Inc. 20% VAT)
(£7.50 Exc. VAT)

Kit consists of 125g of PART A and 125g of PART B

Total kit volume 231ml

PART A and PART B are both clear liquids which are odourless and non-toxic. The two components mix easily with a simple 1:1 ratio and because of the low viscosity can be used without a vacuum chamber. They react to form a translucent beige/off white coloured flexible, elastic material with high tensional and tear strength.

There is practically no shrinkage (0.1%) and excellent reproduction of fine detail. Being an addition/platinum cured rubber its chemical and heat resistance (250°C) properties are superior to tin/condensation cure rubbers translating into a longer mould life.

The pot life is approximately 8-12 minutes and the cure time is 1-2 hours for the medium and soft versions. The extra soft version has a pot life of 10-20 minutes with a cure time of 2-4 hours

Available in three hardnesses, extra soft, soft and medium. The soft is better suited to moulding delicate, fragile items where the rubber needs to be soft and flexible enough to peel off without damaging the casting. The medium is suitable for the majority of cases.

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

It may cause skin irritation making this product unsuitable for applying directly to human skin for life casting. For a suitable product please click here

The maximum operating temperature is 250°C. For a high temperature rubber 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

It can be softened to your own requirements using this softening additive click here

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


Properties Units Extra Soft Soft Medium
Pot Life (25°C) Minutes 10-20 8-12 8-12
Cure Time (25°C) Hours 2-4 1-2 1-2
Viscosity (25°C) Mpa.s 3000 5000 8000
Density (25°C) g/cm3 1.08 1.08 1.08
Hardness Shore A 5 15 28
Linear Shrinkage % 0.1 0.1 0.1
Tear Strength KN/m 13 24 24
Elongation at Break % 500 500 450
Tensile Strength Mpa 2.8 5.5 6.8



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 250°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.


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