Flexible moulds made of polyurethane rubber

Flexible moulds can be made from polyurethane rubber. With a shore hardness of 40 or 60, these moulds are significantly stronger than most silicone moulds. This can make the construction of a support mould unnecessary, depending on the type of object to be moulded and especially when moulding smaller objects. Due to the lower flexibility of the material, it is best to mould flat objects without too many details or undercuts. PUR rubber is very suitable for master models made of, for example, concrete, gypsum, metal or resin.

Since polyurethane rubber has better mechanical and chemical properties than silicone, moulds made of this material can be used very well for casting with abrasion-intensive materials such as concrete, but also for gypsum casting or casting with artificial resins.

> read more

Active filters

Back to top

Flexible moulds need support: support moulds

.

The great advantage of casting moulds, e.g. made of silicone, is that objects can be removed from the mould very easily both during moulding and later during casting due to the flexibility and elasticity of the moulding compound, even if more complicated moulds with undercuts are involved. However, in order for the mould to be stable during casting and for the casting to be perfect, flexible casting moulds usually need a support mould.

A support mould can be made, for example, from Gips or Acrylharz. Very stable support moulds, which are much lighter than plaster moulds, especially for large moulds, can be made, for example, from epoxy resin with added fibres. Multi-part support moulds made of resin can also be screwed together, which is not possible with plaster moulds.

.

Release agent to protect the master model & for perfect demoulding

.

When moulding objects or bodies, parting agents first ensure that the original object, the master model, is not damaged by the moulding process. Release agents prevent „sticking“ or the (chemical) reaction of the surface of the model and the impression material or the mould (e.g. silicone mould) and the casting compound or different mould parts with each other. During casting, depending on the casting compound and the material of the mould, the mould must also be protected from damage by the casting material. The appropriate release agent is selected depending on the materials that meet in each case.

New Account Register

Already have an account?
Log in instead Or Reset password