RESINS are generally
used where ultimate high strength and adhesion is required.
commonly combined with fabrics like Carbon fibre, Kevlar and Glass fibre to
give high strength to weight ratio composites.
It can be
used to bond or laminate wood and other materials, casting and potting can
also be done with epoxies.
advantages over polyester are: very low shrinkage, higher adhesion to many
materials, higher chemical resistance, up to 50% stronger, more durable and
is a semi-flexible type ideal for laminating due to its low viscosity.
epoxy, the hardener ratio must never be altered as under-cure would arise,
the ratio is 50% addition to the resin i.e. 2 parts resin to 1 part hardener
A 150g mix
has a pot life of around 25 minutes at 25ºC ambient temperature. Thin
laminates and coatings may take as long as 5 hours to set, however thicker
sections can gel quicker due to the greater mass involved. In all cases the
gel and cure times are lengthened considerably in conditions just a few
degrees lower and gentle heat may be needed to promote the reaction. Not to
be used in temperatures lower than 5ºC. Typical cure schedule is 7 days at
25ºC or 2 hours at 60ºC after gelling. Exposure to direct sunlight
accelerates both gel and cure.
(Kevlar), carbon fibre and glass fibre normally require up to 1½ times their
weight in epoxy resin. Use PVA and/or non silicone wax as parting agents.
Clean tools with Acetone, cellulose thinner or hot water and detergent. Dry
fully before reuse.
These notes are given in good faith for general guidance
purposes only and since actually operating conditions, methods, application
techniques are beyond our control we cannot accept liability for any losses
however they may occur.