Silicone casting rubber 1:1 Shore 40

Silicone casting rubber 1:1 Shore 40
Silicone casting rubber 1:1 Shore 40
  • Hard silicone rubber
  • Easily miscible 1:1
  • For casting and concrete molds

This high-quality silicone rubber is hard and slightly flexible. The silicone has a simple mixing ratio of 1:1 which makes weighing and mixing very easy. The silicone is suitable for making molds which must have considerable strength, such as concrete molds. This silicone is the first choice when making molds, such as concrete molds.


RESION silicone rubber is highly tear resistant as it has good tensile strength, pliability and elasticity. Molds made with this silicone have a long life span and produce razor-sharp products. Shore 40 silicone is a very hard variant. 

This silicone rubber is highly resistant to polyester casting resins, polyurethane casting resins, plaster, concrete, etc. The silicone rubber is highly resistant to heat and has a very low shrinkage. 

This silicone rubber can easily be made into a brushable or spatterable silicone by adding a few percent of silicone thickener.

Looking for silicone rubber in other shores? We also supply 1:1 mixable variants in Shore 8 (very flexible)Shore 15 (flexible) and Shore 25 (slightly flexible).


  • Weigh the base (component A) and hardener (component B) carefully with a scale in the mixing ratio 1:1 (by weight). 
  • Mix both components thoroughly (not too intensely) for approximately 3 minutes using a mixing spatula. Do not forget to scrape along the sides and bottom of the mixing cup. Then pour the mixture into a new mixing container and mix thoroughly once more.
  • After this, the silicone rubber is ready to use! The processing time is approximately 10 minutes and the recommended processing temperature is 20°C. At higher temperatures, the curing process will take longer. At higher temperatures, curing will be faster and air bubbles will escape less easily. At cold temperatures curing will be slower.
  • The silicone rubber is cured after approximately 8 hours. 

Product properties

Set Basis (SR1-40A) Hardener (SR1-40B)
1 kg 0.5 kg 0.5 kg
2 kg 1 kg 1 kg
6 kg 3 kg 3 kg
20 kg 10 kg 10 kg
200 kg 100 kg 100 kg
400 kg 200 kg 200 kg

Hardness: Shore 40 (hard)                                                                                                                                                                                                                  
1 kg silicone rubber equals 1 litre
Specific weight: 
1.02 kg/dm3
component A Black, component B White
Temperature resistance: 
200℃ long-term, 300℃ short-term
Processing time: 
10 minutes
Curing time (tack free): 
8 hours
Shelf life: 2 years (with closed packaging)
Food safe: 

Buy silicone casting rubber 1:1 Shore 40

You can easily buy silicone rubber (shore 40) and all other silicone rubber products at Order today before 5:30 p.m. and we will send the silicone to you today! Do you have a question about silicone rubber or can we help you with something else? Please contact one of our specialists.

We have a number of recommendations for working safely with polymers. At Polyestershoppen you will not only find the polymers themselves, but you can also purchase all the protective equipment you need from us. If you have any doubts or questions, please contact our customer service. We can give you advice on how to work safely with polymers.

Siliconen gietrubber 1:1 | 40A | zwart | 0,5 kg

Safety equipment


Code Description
EUH210 Safety data sheet available on request.

Siliconen gietrubber 1:1 | 40B | wit | 0,5 kg

Safety equipment


Code Description
EUH210 Safety data sheet available on request.

Product Choices

36,99 36,99
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Volume related prices

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5 Sets € 35,14 € 9,25