Silicone Condensation 20 (Medium Hard)
This silicone has a good fluidity and gives great detail while still remaining strong.The silicone Condensation 20 A + B is a 2-component (poly-condensation curing) castable molding silicone which cures at room temperature. Silicone C 20 -A + B are excellently suited for the casting of eg cement, plaster, wax, soap, and many other casting materials.
Note: Pot life and de-mould time are highly dependent on the mixing ratio and Humidity! By adding more than 2% silicone B (hardener) or at high humidity, the pot life and de-mould time are shorter.
If you want to process polyester in these moulds, we recommend using the special B component: Wacker T51 (5%)
If you want to process epoxy or polyurethane in these molds, we recommend using the special B component: Wacker T21 (5%)
If you want to work very quickly, we recommend using the special B component: Wacker T47 (1-2%). This B component may also be mixed with the original or above B components to achieve a speed of choice with the properties of the above B components.
The silicone C 20 - A + B can easily be mixed by hand or by machine. Mix the A and B component carefully and in the indicated ratio (preferably 2%, you can add between 1.5-3% B comp)
Example: To 1 kg of A-Comp add preferably 20 grams of B-component. You can vary between 15 grams (1.5%) up to 30 grams (3%). Less or more will inhibit cure or alter the final properties of the rubber.
At 1.5%, the silicone will take longer to harden giving air bubbles more time to escape. With 3% B component the silicone will cure considerably faster. Process the mixture in the pot life and never take more than you can handle within pot-life. Only de-mould after a complete cure.
If you wish to make a mold by using a brush or spatula you need to add a 3rd component (0.6% -2% Thixo C). Typically 1% will do the trick. Thixo C thickens the mixture and makes it possible to set up the silicone agains vertical surfaces. Please be aware that the mold in this case must be provided with a support cap. This support cap may consist of gypsum bandages or epoxy support cover or acrylic resin with glass fibre fabric.
Provided that the silicone is kept in a sealed package and stored cool and frost-free, the shelf life is at least 1 year.
If you frequently work with the silicone is recommended to wear during processing gloves and properly ventilate the area. For safety instructions, see always the safety data sheet.
Further important safety information:
H226 Flammable liquid and vapour.
H319 Causes serious eye irritation.
H332Harmful if inhaled.
H335 May cause respiratory irritation.
H371May cause damage to organs.
P-Code Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P243 Take precautionary measures against static discharge.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/protective clothing/eye protection.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P337+P313 If eye irritation persists: Get medical advice/attention.
P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P312 Call a POISON CENTER/doctor if you feel unwell.
P370+P378 In case of fire: Use water spray, extinguishing powder or carbon dioxide to extinguish.
P403+P235 Store in a well-ventilated place. Keep cool.
P501 Dispose of contents/container to waste disposal.
- Good liquid (self-bleeding)
- Easy to mix
- After curing strongly
- Low shrinkage (<0.3%)
- Colour White