FIBREGLASS AND RESIN
The most common everyday kind of reinforcement used to undertake many types of fibreglass (GRP) construction and repair work, including boats, canoes, kayaks, roof, motorcycle fairing, sub-box build, pond build and repair, the list is endless.
Resin : Glass ratio of 2-2.5:1, i.e 2.5 kg of Resin will “wet out” 1kg of Chopped Strand
WATER CLEAR CASTING RESIN
Standard curing volume with cataylst is 2%- i.e - 2ml per 1kg of Resin.
Always when catalyzing Gelcoats use 2% minimum.
Catalyst - Medium Reactivity - MEKP
Standard curing agent for Polyester Resins and Gelcoats.
Im warmer conditions use minimum 1% by volume, i.e 10ml per Litre of Resin, never use less than 1%, in colder conditions use between 2-3%.
Please handle very carefully, and observe hazardous labelling.
Silicone Rubber Kits – Basic Instructions
The range of silicones is a group of quality silicone-moulding compounds developed to give the maximum economy in terms of price while maintaining and providing high quality reproduction, long mould life, very low shrinkage and no risk of the sating material gripping the mould surface.
Our Silicone has been formulated for easy mixing by hand, with colour coded components giving a visual aid to ensure mixing is adequate. The two components mix easily and because of the low viscosity most grades can be used without processing in a vacuum chamber.
HOW TO USE - Always weight the silicone and catalyst precisely before mixing otherwise the silicone may not cure. This allowsfor any discrepancies that may occur.
Preparation The surface of the original should be clean and free of any dust or loose material. If necessary, particularly with porous surfaces, a suitable release agent such a petrogel or a spray wax should be used.
Mixing Mix Ratio 100:2 by weight for our mouldcraft 320,325,330 and 340 ranges - 100-10 for the 3481 silicone kit
Pour the orange Curing Agent on to the white base and gently mix and fold the two components together avoiding as much air entrapment as possible. As the mixed material becomes more intermixed you can employ more vigour until a uniform "Salmon Pink" colour is obtained. Pay particular attention to the sides and base of container. When you are sure that the mix is uniformly blended pour the contents into another clean container and re-mix. This is the only way to ensure that the material is thoroughly mixed.
Pouring The silicone can now be gently poured at lowest point into the mould box in ensuring that any of the air bubbles burst over the squashed rim until the level of the liquid in box has risen sufficiently over the master models highest point. During this process it is advisable to pour the mixed material in a long streaky stream which also helps in bursting air bubbles introduced during mixing.
Care of Moulds Which casting polyester resin into silicone moulds, styrene attack can be minimised, by leaving the moulds open for as long as possible between casts to allow free styrene to evaporate. To achieve maximum mould life with polyester resin it is advisable to first allow the moulds to fully cure after pouring for approximately 5-7 days before casting into them. The moulds can however be used immediately after de-moulding for plaster casting.
Cured Properties of Silicone Colour Salmon Pink
Mix Ratio 100:2 and 100:10
Working Time Mins 40-60
De-Mould Time Hrs 12-14
Mixed Viscosity mPas 18000
Hardness Shore range from A20-A40
Tensile Strength Mpa 3.0
Elongation @ Break % 520
Tear Strength kN/m 23
Linear Shrinkaue % 0.2-0.4