Transparent Silicone Moulding Rubber 500g Kit

(Inc. 20% VAT)
(£12.50 Exc. VAT)


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

Total kit volume 471ml

PART A and PART B are both clear liquids which are odourless and non-toxic. They react to form a flexible, elastic, transparent material with outstanding release properties, a high chemical resistance and a temperature resistance of 200°C. There is practically no shrinkage (0.08%) and excellent reproduction of fine detail. For optimal clarity try to keep mould walls to a maximum of 10mm thick. This rubber is suitable for casting a wide range of materials please see below for more details.

Available in three hardnesses; soft medium and firm. 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.

*The medium version will require a vacuum chamber if you require no visible bubbles in the rubber. Without a vacuum chamber the bubbles wont effect the use of the mould but being transparent will be visible in the walls of the mould.*

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 200°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 Soft Medium Firm
Pot Life (25°C) Minutes 20-40 20-40 20-40
Cure Time (25°C) Hours 3-5 3-5 3-5
Viscosity (25°C) Mpa.s 6000 8000 6,200
Density (25°C) g/cm3 1.06 1.08 1.1
Hardness Shore A 10 20 40
Linear Shrinkage % 0.1 0.1 0.1
Elongation at Break % 600 600 550
Tensile Strength Mpa 2.2 3.2 7


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