Shoe Casting

SM401 is particularly suited for the low pressure casting processes used in the shoe moulding


GRS Shoe Moulding plasters are designed to produce moulds for casting low melting point alloys such as aluminium or zinc. This product is particularly suited for the low pressure casting processes used in the shoe moulding.

SM401 Investment is a gypsum bonded investment formulated for the casting of Aluminium shoe mould plates using silicone rubber patterns

SM401 is specifically designed for the manufacture of aluminium shoe mould plates for the production of shoe soles. This method of manufacture is used to produce soles for many of the leading names in the training shoe industry.

A typical master shoe mould is constructed from wood, metal, or plastic. Silicone is then poured over the master mould and left to cure. Once set, the Silicone mould is stripped from the master, SM401 is poured into it and allowed to set.

The plaster mould is removed from the Silicone mould and dried out in the furnace. The plaster mould is then set into a frame and molten aluminium is poured over it, the metal is left to cool and the plaster is removed from the Aluminium casting.

Technical InformationSM401
Powder : Water Ratio100 : 40
Work Time @ 22ºC10 – 12 minutes
Initial Set Time @ 22ºC15 minutes
Setting Strength @ 90 minutes200N
Setting Expansion @ 2 Hours1 – 1.2%
Thermal Expansion @ 700ºC0.55 – 0.65%

Industrial Investment is a Block Mould material and has the following advantages over shell:

  • Highest purity raw materials used
  • Particle sizing optimised to suit the requirements of the product
  • Mixes easily to a fluid consistency to avoid air entrapment in the mould
  • Designed to be used without a casting flask
  • Excellent surface finish with high definition and close dimensional accuracy
  • No mould breakdown reducing post cast finishing cast/operation
  • Ease of removal from casting