Moulding and casting Info

Silicone

Types of silicone:

Tin cure silicone

Platinum cure silicone

Tin cure silicone seems to be the type most used.

Silicones have different shore hardnesses. The A scale is for softer plastics while the D scale is for harder ones. Lower number = softer, Higher number = More rigid.

Bill Doran suggests that a 30 is okay for most general purposes.

Good brands/products:

Tin cure silicone tap plastics rtv (rtv= room temperature vulcanisation), durometer: 25/30

Mold max 30 Reynolds advanced materials

Mould star 20 T - Transparent, cures really fast

For brush on moulds:Rebound 25 (platinum cure)

Silicone comes in two parts, you have to mix these two parts in equal ratios. Once you have mixed these two parts, the silicone will usually have lots of bubbles in it. To help get rid of these bubbles you can use the “bombs away method” and pour your silicone from really high up. As that strand of material drops, the bubbles will pop out of it as it goes. This is the cheap method, however it is best to buy a de-gassing chamber

Casting Material - Urethane Resin

Good brands of resins to use:

Making the Mould