This hardener works on all condensation silicones. This T51 hardener from Wacker makes the silicone more resistant to polyester.
This B component may also be mixed with other condensation B components to achieve a speed of your choice with the properties of the other B components. Common mixtures are:
10% T47 with 90% T51, so for 100 grams of A there is 4.5 grams of T51 with 0.5 grams of T47
Processing
You can easily mix the silicone condensation 20 or other condensation silicones by hand or machine. Mix the A and B components carefully and in the stated ratio.
T51 opinion = 5%, so for 100 grams of A component you use 5 grams of Wacker T51 hardener (B component).
You can use 0.5% less or more hardener. If you use less hardener, curing takes longer and air bubbles have more time to escape. Be careful not to use too little hardener, as the silicone may no longer harden (properly). With more hardener, curing will proceed faster, meaning the mold will be ready sooner. The disadvantage is that the mold will also age sooner and shrink more.
Process the mixture within the pot life (processing time) and never make more than you can process within the pot life. Wait until the mold has completely hardened before removing the mold.
Please note: Pot life (processing time) and demoulding time are highly dependent on the mixing ratio and humidity! When adding more silicone B (harder) or at higher humidity, the pot life and demoulding time become shorter!
Brushing or spreading
If you want to spread/spread/iron the silicone on something, you can add Thixo C (0.6%-2%) (usually 1%). Thixo C is a thickener and makes it possible to spread the silicone. You should take into account that in this case the mold must be provided with a support cap. This support cap can consist of plaster cast, an epoxy support cap, or acrylic resin with thickener and glass fabric /
Shelf life
Provided the silicone is stored in closed packaging, cool and frost-free, the shelf life is at least 1 year.
Safety requirements
Use splash goggles, suitable liquid-tight gloves, an apron and work in a well-ventilated area. See Safety Data Sheet for more information
Further important safety information
H-Code hazard statements
H226 Flammable liquid and vapour.
H361d Suspected of damaging the unborn child.
H373 May cause damage to organs through prolonged or repeated exposure.
H412 Harmful to aquatic life with long lasting effects
P-Code precautions
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. Do not smoke.
P243 Take measures to prevent static electricity discharges.
P308 + P313 IF exposed or suspected: Get medical advice/attention.
P403 + P235 Store in a well-ventilated place. Keep cool.
P501 Dispose of contents/container to waste disposal.
Documentation
EN - Product Information Silicone Condensation 20.pdf
EN - Safety Sheet Wacker_Catalyst_T_51.pdf
WACKER Catalyst T series for moldmaking.pdf
