Casting Polyester Resins In Latex Moulds
Silicone Oil is the only release agent RECOMMENDED for our rubber moulds. This mould release ensures perfect removal of polyester
based resin figures. The oil is applied by either spraying, brushing or wiping the inside surface before the resin is poured into the mould.
High temperatures are generated when resin and hardener are mixed together. This high temperature will damage the rubber moulds, so
precautions should be taken to reduce the resin temperature.
The rate of heat generated can be reduced by varying the amount of hardener mixed with the resin.
Use approx: 1/3 to ½ the manufacturers recommended amount of hardener
A test mix at normal room temperature is recommended to determine the minimum
quantity of hardener necessary for good results.
One hour after mixing the resin, hardener and fillers together the mix should be like a jelly. If it is still like a liquid, a drop more hardener is
required; if set solid then too much hardener has been used.
Fillers can be used to reduce the cost of moulded pieces. Marble powder is the most suitable and has many advantages:
1. Adds weight to the moulded figure.
2. Gives a natural marble finish.
3. Not as brittle as 100% mix. ;
MIX: 1 part resin to 2 ½ parts marble powder. By weight.
or, 1 part resin to 2 parts marble powder. (Lightly packed) by volume.
TO REMOVE MOULD
Cover the outside of the mould in a solution of soapy water or washing up liquid, Palmolive is the most suitable. Take a firm hold of the
model and peel the rubber mould from the base quickly.
Acetone may be used for cleaning moulds when changing the resin colours or removing wet resin, but with the following precautions:
(a) Do not leave the moulds to soak.
(b) Perform the cleaning quickly.
TREATMENT OF MOULDS
After use all moulds should be cleaned and turned the right way around (detail of inside) for drying. Sprinkle the dried moulds with talc.
When not in use store moulds in a closed box away from heat, light or electrical equipment (ozone). Rubber moulds will rapidly be ruined
if they come in contact with mineral oils or left in the bright sun light.
WORKSHOP HYGIENE FOR USERS OF RESIN
Cured resins are harmless; but certain liquid resins and hardeners may irritate the skin and cause allergies.
A few simple rules and precautions must be observed to banish the element of risk involved in handling any resin and hardener.
Before starting work it is advisable to treat your hands and fore arms with a special barrier cream; also people with sensitive
skin or hands with any cuts to wear rubber gloves.
As with most chemical substances a clean workshop with good ventilation, clean work clothing and clean hands are the key to
Any resin hardener mix splashed on your skin should be wiped away immediately with paper, and washed with soap and water, with a 3%
boracic acid solution or with a suitable remover as soon as possible.
Never use solvent, cleaning rags or abrasive soaps to remove resin/hardener, or mixture off your skin. .
Wear goggles if there is any danger of splashing the mixture into your eyes. If something does get into your eyes, bathe it with running
water for 10-15 minutes and consult a doctor.
The information given in this publication is based on the present state of our knowledge, but any conclusions and recommendations are
made without liability on our part. Buyers and users should make their own assessment of our products under their own conditions and for