Silicone Addition Clear 0 Super Soft Set – Crystal-Clear Silicone Gel for Potting Electronics & Optics

Premium Crystal-Clear Silicone Gel for Professional Potting and Optical Applications

Silicone Addition Clear 0 is a pourable, addition-curing (platinum) two-component silicone that cures at room temperature to a firm, crystal-clear gel with a hardness of Shore A 0. Once mixed, the material flows well (1,500 to 2,500 cSt at 20 °C) and is self-degassing, while linear shrinkage stays below 0.1%. With a pot life of 50 minutes and a demoulding time of 3 hours at 20 °C, you can move on quickly. The mix ratio is 1:1 by weight (100 parts A to 100 parts B); only combine components with the same lot number. Clear 0 is ideal for potting electronics and optical elements and for transparent moulds in which the model needs to remain visible.

Key Benefits

• Hardness Shore A 0: very soft, firm gel – encapsulates components without mechanical stress while remaining dimensionally stable.
• Linear shrinkage <0.1%: virtually shrink-free – potted components and optical elements stay exactly in place.
• Crystal clear after curing: the potted part or model remains clearly visible – over time the material may yellow slightly, but its transparency is retained.
• Viscosity 1,500 to 2,500 cSt: free-flowing and self-degassing – flows into small openings and around components and lets air escape easily.
• Pot life 50 minutes at 20 °C: generous working time – enough time to mix, degas and pour calmly.
• Demouldable after 3 hours at 20 °C: fast cure at room temperature – can be accelerated further in an oven.

Typical Applications

• Potting of electronics and printed circuit boards
• Embedding and protecting optical elements
• Transparent moulds for master models without undercuts, which are cut open after curing
• Moulds in which the model must remain visible during making and demoulding

Processing instructions:

1. Stir component A and component B separately and thoroughly before use.
2. Weigh A and B accurately in a 1:1 ratio by weight (100 parts A to 100 parts B). Only use components with the same lot number – mixing different lots can lead to curing problems.
3. Mix by hand or by machine, slowly and thoroughly in a figure-of-eight motion without folding in air, until completely homogeneous.
4. Preferably degas the mixture in a vacuum chamber immediately after mixing to prevent trapped air.
5. Pour the mixture slowly from a single point within the pot life of 50 minutes (20 °C).
6. Only demould once fully cured, after approximately 3 hours at 20 °C. Curing in an oven speeds up the process, but air bubbles then have less time to escape. Pot life and demoulding time depend strongly on temperature: the warmer, the shorter both become.

Modifying, Colouring and Shelf Life

• Adding silicone oil makes the mixture even more fluid, so air bubbles escape more easily, and lowers the hardness. Silicone oil does not cross-link and may migrate to the surface over time.
• To spread rather than pour, add Silicone Addition Thixo A or fumed silica. Do not use Thixo C, which is intended for condensation silicones.
• Colour with silicone pigment.
• At higher temperatures the gel may develop a very faint yellowish haze; for most potting applications this is not a problem.
• Stored in closed packaging in a cool, frost-free place, the product has a shelf life of at least 1 year.

Silicones and More, specialist in high-quality mould-making rubbers and casting materials for professional makers.

Important Warning: Inhibition of Addition Silicones

Please note: This is an addition silicone (platinum cure). Curing can be inhibited by sulphur, nitrogen, amine compounds and metal salts. If you are unsure whether the materials you use (gloves, spatulas, cups, models) contain these substances, carry out a small test first. Inhibiting substances are found in, among other things, latex gloves, some plasticines, paints and adhesives, condensation silicones, one-component silicone sealant, natural rubber and 3D printing materials (especially stereolithography). If in doubt, apply a separating layer of polyvinyl alcohol (PVA).

Professional Support

Silicone Addition Clear 0 is the softest clear silicone in our range. If you need a slightly firmer clear silicone, take a look at Silicone Addition Clear 5 or Silicone Addition Clear 25. If measuring points need to remain accessible after potting, the low-viscosity Silicone Addition Gel 840 Clear is a better choice. If in doubt, contact us at info@siliconesandmore.com; we are happy to advise you.