Aldax Silicone Putty
What is it?
Aldax Silicone Putty is a two-part RTV silicone rubber, non-toxic material with the viscosity of putty for making simple but detailed moulds. The mould will withstand temperatures up to 315°C.
This rubber does not require moulds or containers which liquid silicon or our RTV rubber requires. You simply mix equal parts of Part A was an equal quantity of Part B which requires less time and skill in preparing the rubber ready for application.
Simply put, it is the fastest, easiest means of producing a reusable mould that is flexible and accurate.
It is safe to use and does not give off any toxic fumes. Those who are allergic to silicone should still take all the necessary safety precautions. For others there is no necessity to use gloves while mixing.
Silicone putty comes in two forms-a general-purpose putty and one that is manufactured with food safety in mind that may be used in the manufacture of chocolates and other food materials.
Keep in a cool dark storage place with the lids firmly closed. If the silicone putty is not exposed to air it will last for more than one year.
It comes in two parts, one of which is coloured differently to the other to ensure easy and even mixing. There is no need to weigh the silicone-simply estimate equal quantities of each part by eye and knead the putty in your hands until an even colour without streaks has been achieved. It is advisable to take only a minute or less to do this as the silicone starts curing soon after mixing.
How to use
Immediately you have finished mixing press the putty around or against the object to create a firm impression and leave it to sit for between 5 to 10 minutes depending on the temperature. Press the putty from the centre of the object outwards to completely expel any air that may be trapped against the face of the mould. It is essential do this to make sure air is completely removed as putty has a tendency to trap air unlike liquid silicone which pushes air ahead of the liquid as it gradually covers the surface.
A mould release is unnecessary as silicone does not stick to other objects, however one difficulty is that it can become entrapped in wood fibres and become difficult to remove. The putty can in some cases due to its easy release properties, fall away from the object being used as a model if it is not supported in some way.
Unlike a mould made from a liquid silicone you will not finish with a level base to facilitate casting. A level base can be achieved by attaching two wooden strips which you can attach to either side of the mould base with silicone putty while making the mould.
The finished mould when removed from the object would then rest on the two wooden strips providing a level base into which you can cast.
As a silicone putty begins to set up in as little as three minutes after you have finished kneading, you must work quickly. Extend the putty out to at least 1 cm on all sides of the object to provide a level surface around the mould opening.
As silicone will stick to silicone any thin areas can be repaired by adding additional putty to the completed mould.
What can the moulds be used for?
As the moulds can be safely used at oven temperatures they can be used for polymer clothes or for liquid resin jewellery castings using either polyester, epoxy or polyurethane resins. The special food safe resin can be used for chocolates, sweets for gelatin.
Copyright 2008 Aldax Moulds By Stan Alderson