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Silicone casting rubber 1:1 Shore 40 (translucent)
At a glance
- Hard silicone rubber
- Type: platinum cure
- For concrete moulds
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Product description
Silicone casting rubber Shore A40 is the stiffest semi-transparent silicone casting rubber in our range. This hard silicone rubber is translucent (semi-transparent) and is ideal for producing large moulds that require excellent structural strength. As a result, it is the preferred choice for moulds used to cast concrete, tin or copper.
RESION silicone casting rubber features a simple 1:1 mixing ratio, making measuring and mixing quick and easy.
Features of translucent silicone casting rubber Shore 40
Unlike the black version, this silicone casting rubber is translucent, giving the finished mould a semi-transparent appearance. Apart from its colour, this translucent silicone casting rubber offers the same properties as the other RESION silicone casting rubbers. The material combines high tensile strength with limited flexibility and moderate elasticity. As a result, moulds made from Shore A40 silicone casting rubber have a long service life and reproduce fine details with outstanding accuracy.
Once cured, the silicone rubber offers excellent resistance to polyester casting resins, polyurethane casting resins, plaster, concrete and many other casting materials. In addition, it is highly heat-resistant and exhibits minimal shrinkage.
RESION Silicone Casting Rubber Shore A15 has been independently tested by TÜV SÜD for food safety and complies with European and German regulations for materials intended to come into contact with food (EC 1935/2004, EU 2025/40, Resolution AP(2004)5, LFGB and the BfR recommendations).
Benefits of translucent silicone casting rubber Shore 40
- Translucent in colour (semi-transparent).
- High tensile strength.
- Rigid (Shore 40).
- Easy 1:1 mixing ratio.
Also available as a flexible Shore A15 version or as fully transparent Shore A40 silicone rubber.
Directions for use
Silicone casting rubber is easy to use thanks to its 1:1 mixing ratio. Follow the steps below for the best results.
- Accurately weigh the base (Component A) and curing agent (Component B) using a scale in a 1:1 mixing ratio.
- Thoroughly mix both components for approximately 3 minutes using a mixing spatula. Avoid mixing too vigorously. Be sure to scrape the sides and bottom of the mixing cup thoroughly. Then pour the mixture into a clean mixing cup and mix again until fully homogeneous.
- The silicone casting rubber is now ready for use. The working time is approximately 45 minutes and the recommended processing temperature is 20 °C. At higher temperatures, curing will occur more quickly, giving trapped air bubbles less time to escape. At lower temperatures, the curing process will be slower.
- After approximately 8 hours, the silicone casting rubber will be tack-free.
This silicone casting rubber can easily be converted into a brushable or spreadable silicone by adding a few percent of silicone thickening agent.
Specifications
| Set | Base (SR1-40A-TL) | Curing agent (SR1-40B-TL) |
| 2 kg | 1 kg | 1 kg |
| 6 kg | 3 kg | 3 kg |
| 20 kg | 10 kg | 10 kg |
| 200 kg | 100 kg (10 x 10 kg) | 100 kg (10 x 10 kg) |
| 400 kg | 200 kg (drum) | 200 kg (drum) |
Type: Platinum-cure RTV-2
Hardness: Shore A40 (hard)
Mixing ratio: 1:1
Colour: Translucent (semi-transparent)
Specific gravity: 1.02 kg/dm³ (1 kg ≈ 1 litre)
Working time: Approx. 45 minutes at 20 °C
Curing time: Approx. 8 hours (tack-free)
Temperature resistance: 200 °C continuous / 300 °C short-term
Food-safe: Yes
Shelf life: 2 years (unopened packaging)
Product properties
The key technical properties clearly listed in one place.
- Article number
- SIL001768
-
The technical product category, such as primer, resin, hardener or cleaner. It explains the product's purpose and helps you find other products with a similar function.
- Silicone casting rubber
-
Mixing ratio indicates how much of each component is needed, for example resin (A) and hardener (B). A ratio of 100:50 by weight means 100 grams of A to 50 grams of B; by volume you might use millilitres. Weight and volume ratios are not necessarily the same because the components may have different densities. Accurate measuring is important for proper curing.
- 1:1
-
The tasks a product is intended for, such as laminating, casting, bonding, sealing or protecting. Products intended for the same application can differ considerably in processing, curing time and final properties.
- Making a concrete mold
- Colour
- Translucent
-
Hardness describes a material's resistance to indentation. For silicone rubber and other elastomers, the Shore A scale is commonly used: Shore A 15, for example, is softer than Shore A 40. Harder plastics may be rated on the Shore D scale. The number belongs to its Shore scale and is not a unit like MPa; values on different scales cannot be directly compared.
- Shore 40
-
Density describes the mass of a material per unit volume. Values may be given in g/cm³, kg/L or kg/m³; 1 g/cm³ equals 1 kg/L. For example, one litre of a liquid with a density of 1.2 kg/L weighs approximately 1.2 kg. Density helps convert between weight and volume, but it can vary with temperature.
- 1.02 kg/dm³
-
The period for which an unopened product remains usable under the specified storage conditions. Check whether the period starts from the manufacturing date or another date. Shelf life may be shorter after opening, especially for products sensitive to air or moisture.
- 24 months
- Net contents
- 20 kg, 2 kg, 6 kg
-
Working time is the period during which a product remains workable after mixing or activation, usually given in minutes at a specified temperature, often 20 °C. With reactive resins, the chemical reaction also continues in the mixing container, and larger quantities or higher temperatures can shorten this time. Working time is different from gel time and full curing time.
- Approximately 45 minutes (at 20 °C)
-
Food contact suitability means that a material may come into contact with food under specific, defined conditions. This suitability does not automatically extend to every application.
- Food type: for example water-based, acidic or fatty foods.
- Contact time and temperature: brief contact may have different requirements from long-term storage or contact with hot food.
- Processing: correct mixing ratio, full curing and any required post-curing may be conditions of approval.
A fully cured or odourless product is not automatically food-safe. Check the manufacturer's declaration or technical documentation for the permitted use.
- Yes
-
Heat resistance describes the temperature a material can withstand after correct processing and curing, usually expressed in degrees Celsius (°C). Continuous exposure is different from a brief temperature peak, and mechanical loading may also affect the limit. Heat resistance is not the same as the temperature at which the product can be applied.
- Up to 200 °C (short-term up to 300 °C)
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