Silicone Addition Clear 25 (Medium Hard)
Crystal clear silicone which are suitable for flexible infusion of LEDs and optical elements. These silicones are also very suitable for simulation of water in aquarium sets and windows for miniatures.
The Silicones A Crystal clear 25 is a 2-component (Platinum) addition curing silicone which cures at room temperature. The silicones are, after mixing, very liquid and crystal clear.
Because of the low shrinkage and very good clarity these silicones are ideal for potting of electronics, optical elements or as a mold for models without undercuts that need to be cut out.
The tear strength is too low for the silicone to be used as a normal mold with undercuts.
- Low shrinkage of <0.1%
- Very fluid and self deaerating
- Crystal clear
- Suitable for potting
- Refr. Index @ 25°C 1.406
- Mixing ratio in weight: A:B = 1:1
- Pot life at 23°C: 130 minutes
- De-mould time 23°C: 20 hours
- Viscosity at 23°C: 4000 cSt
- Color: Crystal clear
- Hardness: shore A 24-27
- Density: 1,03 g/cm3
- Tensil strength: 3 N/mm2
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 figur of 8 motion. If you want to reduce the Shore (hardness), you can add silicone oil from the shop. Please note that oil does not bind to the silicone network and may over time bleed from the silicone.
If you do not want to pour the silicone spatula but you can add Silicone Thixo A (note: not Silicone Thixo C !!). You can also add fumed silica. You can color these silicones intensely with silicon dye.
The silicon might obtain a very slight yellow hue when used at elevated temperatures (>80 ° C).
Please note: This is an addition curing silicone. This type of silicones may experience cure inhibition when coming into contact with sulfer, nitrogen, amino groups and metl 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 platicines, glues, laquers, condensation curing silicones, silicone caulk, natural rubbers and 3D printing materials (mainly stereolithography).
The products are packaged in sets of 1 Kg, 2 Kg, 9 Kg, 40 Kg and 400 Kg. The components can not be ordered separately. For larger packages we ask you to contact us through the site.
Provided that the silicone is in a sealed container and stored cool and frost-free, the shelf life is at least 1 year.
If you use silicone frequently we advice the use of gloves and to work in a properly ventilated area. For safety information see the safety data sheet.