If you are new to mould-making and casting, this is the page for you!


I have listed many of the words and terms, together with their meaning below to avoid confusion.

 

Activate- The process of adding one liquid to another to initiate physical change (usually the addition of a catalyst to another substance.)


Addition polymer- The chemical mechanics of the change induced by the catalyst. Does not work well with condensation polymers.


Catalyst- Usually liquid (can be powdered) volatile chemical causes an intentional reaction with another substance to change physical properties. Usually liquid to solid.


Cast- Production of a copy of the original shape. A replica.


Condensation polymer- The chemical mechanics of the change induced by the catalyst. Does not work well with addition polymers.


Cure- The process of 2 or more chemicals reacting to produce 1 substance.


Filler- Any dry non-reactive (inert) substance used to saturate a resin to change texture, colour or resistance to heat/cold.


Inert- Non-reactive substance, harmless material.


Inhibition- Undesirable effects of one substance on another causing one or both materials to fall short of achieving full physical properties.


Isocyanate- Volatile substance, known to cause cancer with over exposure amongst other affects. One of the two parts of Polyurethane compounds. The other is Polyol.


Jacket- A rigid supporting structure made from Fibreglass or Mod-roc. Used with soft skin moulding materials like silicone or latex. 


Laying up- Part of the fibre-glassing process involves the layering of strips of glass fibre soaked and bonded together with polyester GP resin.


Master- The original object that will be moulded and cast to produce a replica.


Mother mould- See Jacket.


Mould- A negative impression of the Master. Used to produce a cast.


Multi part mould- Advanced mould making technique using 3 or more pieces to form one mould. Used to produce complicated castings.


Open mould- Simple one-piece mould making method used to produce simple shapes.


Plug section mould- Fairly involved process usually made with rubber, used to capture inner and outer detail such as that of a cup or glass.


Polymer- Large molecule made of many adjoining parts such as that found in plastics and some natural materials like animal shells and horns.


Polyol- One of the two parts of polyurethane. Less harmful partner of Isocyanate.


Prosthetics- An artificial extension of the human body often using rubber/ foam.


Release agent- A barrier layer acting to separate one surface from another to prevent one sticking to another.


RTV- Room Temperature Vulcanizing, a process of curing rubber, coined by the inventor Charles Goodyear (like the tyre he later invented).


Shore hardness- A valuable scale used to measure the hardness of a substance. 0 is the softest 100 is the hardest. Shore A hardness used to describe foams and rubber. Shore D hardness is used to describe plastics.


Skin mould- Fairly involved method of mould-making using rubber. Commonly used to replicate large sculptural works or complicated shapes as a one piece mould. Needs support of a jacket.


Slip cast- A hollow reproduction of the original Master.


Split mould- A simple way to capture the detail of an entire surface of an object using rubber.