Silicone Thinner™

Buy Smooth-On at FormX

Smooth-On is one of the world’s leading manufacturers of 3D modeling materials such as mold-making, casting and special effects materials, as well as industrial casting resins, adhesives and equipment. FormX is the main distributor of Smooth-On products in Europe.

Smooth On

Silicone Thinner™ is a non-reactive silicone fluid that will lower the mixed viscosity of tin cure (condensation) or platinum cure (addition) silicone rubber products.

Products

Silicone Thinner™ Silicone Thinner™ ... € 11.49 Buy now

Instructions

Silicone Thinner™ offers the following advantages:

  • A lower mixed viscosity (A+B) means that the rubber will de-air faster when vacuuming.
  • Mixed rubber (A+B) will flow better over intricate model detail.
  • Silicone Thinner® will lower the ultimate shore hardness (durometer) of cured silicone rubber.
  • Pot life (working time) is increased in proportion to the amount of Silicone Thinner® used.

Disadvantage: Ultimate tear and tensile strength are reduced in proportion to the amount of Silicone Thinner® added, however knotty tear properties of the Mold Max® series rubbers are unaffected. Instructions

Materials should be stored and used in a warm environment 23° C. This material has a limited shelf life and should be used as soon as possible. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk.

*Silicone Thinner™ is added as a percentage of the total Part A+Part B rubber system. An accurate gram scale must be used. Weigh out and pre-mix required amount of Silicone Thinner™with Part A of silicone rubber before adding Part B. Mix all components thoroughly and vacuum as directed on mold rubber technical bulletin.

It is not recommended to exceed 10% by weight of total system (A+B).

Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.

Why buy at FormX?

  • Dedication to Materials

    Dedication to Materials icon

    For over thirty years we have sought out the highest quality modelling, moulding and casting materials from around the world.

  • Inspiring + Unique

    Inspiring + Unique icon

    From silicones and resins to Jesmonite and special effects materials — a curated range for professionals, artists and makers.

  • Expert Advice

    Expert Advice icon

    Our sales team is widely known for their knowledge and dedication, supporting you in mould making, casting, sculpture and prototyping.

  • Shipping Across Europe

    Shipping Across Europe icon

    We ship from our warehouses in Amsterdam, Barcelona and Madrid to customers throughout Europe, from Greece up to Norway.

  • Amsterdam Original

    Amsterdam Original icon

    Founded in Amsterdam, FormX grew from a local art foundry into a major European supplier — with our roots firmly in the city.

Visa logo iDeal logo Mastercard logo Paypal logo FedEx logo DPD logo GLS logo
This website has been developed by Usecue B.V.
© 2026 FormX B.V.