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Techsil RTV27941 is a translucent liquid silicone rubber designed with mould making in mind. When mixed this two-part casting resin kit cures at room temperature to a flexible 41 Shore A translucent silicone rubber with a linear shrinkage of just 0.1 per cent.

As a mould, RTV27941 offers excellent release ability with fantastic durability when used with both epoxy and polyurethane resins. These properties are due to its high tear (620N/mm) and tensile (6.4MPa) strength, along with elongation of 360 per cent.

Resistance to tear is a very important feature for any moulding rubber, once cured it enables the mould to be stretched and pulled in various directions and still retain its original shape. This is key when removing the cast parts from the mould and will ensure a longer usable life for the mould itself.

RTV27941 is suitable for prototype mould making across a range of industries; favoured in the electronics industry for making home appliance moulds, along with TVs, mobile phones and copy machines. In the automotive industry, RTV27941 can be used for creating console box moulds, radiator grills and lamp housings.

With a handy mix ratio of 10:1 and a low working viscosity, RTV27941 is very easy to use. It offers a work life of 90 minutes at room temperature and a full de-mould time of 24 hours. To achieve faster cure speeds, elevated temperatures may be used.

Available in a range of different-sized kits to suit any requirement, the most popular kit sizes are 1.1kg and 5.5kg. Both are available online with next working day delivery.

The ability to create accurate prototype parts in a fast and cost-efficient way is a key element in today’s rapid prototyping industry. Silicone resin systems designed for mould making, coupled with quick-curing injectable resins work together – using a translucent silicone in this process brings added benefits.

When making a mould with translucent material there is no concern over how the master is encased, it can be completely enclosed and covered with the silicone as the translucency provides an optical aid that allows the master to be easily cut out using a knife. The mould can then be re-assembled and resin injected to re-create the original, at this stage the translucent mould provides a visual check to ensure the resin has been effectively injected.


Distributors of a vast array of industrial Adhesives, Sealants, Tapes, Casting Resins and Dispensing equipment, serving a wide range of manufacturing industries including Electronics, Aerospace, Automotive, Medical, LED Lighting, Product Assembly, Rapid Prototyping and Packaging. Techsil® are authorised distributors for Momentive’s adhesive sealants. A particular strength is our in depth knowledge of technical adhesive and sealant applications in real production environments and we pride ourselves in providing the best customer care and service.

Techsil® was set up in 1989 and with our commitment to quality, technical excellence and reliability we have evolved into one of the most trusted Adhesives and Sealants suppliers around. We are global distributors of a vast array of industrial Adhesives, Sealants, Tapes and Dispensing equipment, serving a wide range of manufacturing industries including Electronics, Aerospace, Automotive, Medical, LED Lighting, Product Assembly and Packaging to name just a few.

How Can We help You? When you need the best materials for bonding, potting, sealing, coating or overmoulding, Techsil’s Technical Experts will help in product selection, from silicones, hot melt adhesives, tapes, epoxies, hook & loop fasteners and polyurethanes to the latest innovative UV LED curing systems. Techsil® specialises in adding value to industry by providing you with a consultancy / problem solving service through materials technology and process improvement. We have gained an enviable reputation in customer care and service.

Through good partnerships with our suppliers, we are able to offer a complete range of solutions to include well-established product ranges and new, technologically advanced materials. We are authorised distributors for Momentive Performance Materials, ThreeBond, MG Chemicals, BJB, ITW Devcon, Power Adhesives, FastFixers, ITW Stokvis Tapes, VELCRO®, Araldite®, ChemTrend, Panacol and Hönle and we also have a growing range of Techsil’s own brand products.

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