Biomould is a bit like paper maché, but very strong. It sets chemically in 1 to 2 hours. It is easy to work with and can be used with a lot of filler. The formulation can be varied greatly depending on the product desired. The cardboard dust fibres make it quite tough and it can be dropped on the floor without damage.
A typical formulation would be: 62% powder to 38% hardcast binder by weight.
This gives a dough consistency.
If a Biomould formulation is oversaturated with liquid, some will leak out and cause a white discolouration.
Pot life is about 20 minutes. Setting takes between 1 and 2 hours.
On setting Biomould releases a film of liquid against the mould. This releases it from all surfaces. Wash it off.
Pourable formulations form an air dried skin on top, which contracts and may distort the surface. A plastic sheet to stop evaporation will prevent this.
Fresh casting can deform under their own weight until dry. Keep them supported until dry.
Development no. 138009