Silicone Addition Transparent 25 Normal
The Transparent 25 Normal is a 2-component (Poly-Addition) casting silicone which hardens at room temperature to a medium hard and strong silicone rubber.
- Medium hard
- Liquid well
- High tensile strength
Especially for prototyping, these silicones are used a lot. Because the original can be seen reasonably well in the silicone form, it is easy to cut out.
The Silicone Addition Transparent 25 is a 2-component (Platinum) Poly-Addition molding silicone which hardens at room temperature. The silicones are very well fluid and the results offer a very high tensile strength. The transparent silicone is suitable for molds where it is important that the molded object remains visible. In this way, a mold can be cut very accurately and in the right place.
These silicones are very versatile and food and skin friendly. They are also great to use for making stamps (tamponeer industry) and prostheses and podiatry.
Mixing ratio (weight)
Pot Life @ 20°C
De-mould time @ 20ºC
[N / mm2]
[N / mm]
Note: Pot life / de-mould time is highly dependent on temperature! At a higher temperature, the processing time and de-mould time are shorter.
The Silicone A and B component can easily be mixed by hand or by machine. Mix the A and B component carefully and in the indicated ratio (100 parts A and 100 parts B by weight). Process the mixture within the pot life and demould only after it is cured complete. Alternatively, you can speed up the curing process by placing the whole mould in an oven. Please note that air bubbles will then have less time to escape the casting.
Trapping of air bubbles can be prevented best by placing the silicone under vacuum immediately after mixing. To prevent air bubbles, stir the A and B component well but slowly without stirring in air. We advise to use a figure of 8 motion.
You can change the hardness (Shore) Readily by mixing the A components of the Shore 15 set and the Shore 40 set. If you take for example, the same amounts of Silicone addition Transparent 15 A and Silicone addition Transparent 40 A you will get a hardness of about Shore A 27.5.
The component B FAST provides a curing time of 15 minutes. The component B NORMAL gives a curing time of 6 hours. These two can be combined so that you can determine a curing time for yourself. For mixing ratios of the B component, consult the chart in the information sheet.
Note: The percentage of the total B component must always be 10% of the total weight of the A component.
Please note: This is an addition curing silicone. This type of silicones may experience cure inhibition when coming into contact with sulphur, nitrogen, amino groups and metal salts. If you are not certain that the products you use (including gloves, spatulas and cups) contain these ingredients, please do a little test first! These components are often found in many latex gloves, some plasticines, glues, lacquers, condensation curing silicones, silicone caulk, natural rubbers and 3D printing materials (mainly stereolithography). If you want to use these Silicones on these surfaces please use polyvinyl alcohol to seal the surface first.
Provided that the silicone in sealed packaging, stored cool and frost-free, the shelf life is tenminste1 year.
If you use silicones frequently we advice the use of gloves and to work in a properly ventilated area. For safety information see the safety data sheet.