Welcome to the Prince August Tutorial on making a Master Mould. This is to compliment our introduction of Silicone Rubber product (PA-HT42) to our website. We use this rubber to cast our master moulds and cast our master metal figures from these. Then we create our Black rubber moulds for sale using these metal figures.

The advantage of this silicone rubber is the ease of use, as you can pour equal parts from both containers into a new container to prepare the rubber, while other rubbers require smaller and more awkward percentages.

There is little or no airbubbles created when using this rubber so that is a major time saving bonus.

Additional materials needed are Plasticene and basic tools mentioned in tutorial. You will also require an item that you wish to cast (e.g.: sculpted figure, found item, etc.).

NEW BONUS TUTORIAL on preparing the miniature for silicone rubber casting.

.

1. The finished milliput models are laid out into plasticene. Our highly experienced mould-makers will choose the optimum arrangement of the figures to ensure that each figure is fully filled when the mould is in use.
   
   
2. Once the final arrangement of the figures has been chosen an outline of each model is scored into the plasticene.
   
   
3. The excess plasticene is scooped out using a dental tool.
   
   
4. The formers for the ingate and main gallery are then added. Great care is given to the design of the gallery and ingate to optimise the flow of metal into the mould and to improve air removal. Location points around the outside of the mould are also added, to ensure the accurate registration of the final mould.
   
   
5. Once the milliput models have been set into a plasticene base a wall of plasticene is wrapped around the base and sealed in with a dental tool.
   
   
6. This forms a reservoir for our special heat resistant liquid rubber. This liquid rubber compound has been specially developed to gain the highest detail and resist the high temperatures involved in casting. Our special preparation techniques ensures a perfect consistency of the compound which will improve the moulds flexibility which is important for releasing items from the mould.
   
   
7. The liquid rubber is then carefully poured into the reservoir so not to trap air in the mould. The assembly is then left to set for five hours.
   
   
8. When the first half of the heat proof master mould has set, the outside wall of plasticene is then removed leaving the first half of the master mould and the plasticene with the milliput figures remaining.
   
   
9. The plasticene is then carefully removed leaving the figures, ingate and galleries remaining in the rubber. The first half of the mould and its contents are then painstakingly cleaned and covered with a release agent to aid separation of the two halves.
   
   
10. A wall of plasticene is then added to the first half.
    
    
11. The rubber is poured for the second half of the mould and then left to set for five hours.
    
    
12. The plasticene is removed from the outside of the mould.
    
    
13. The mould is then trimmed square.
    
    
14. Finally, the mould is hand cleaned to remove any parts of the milliput master that may have become dislodged in the mould making.
    
    
15. The finished mould is ready for casting the master figures to create the spin casting moulds.