We manufacture Organic & other chemicals used for textile industry, M.E.K. Peroxide (Hardener), used for fibre glass industry, raw materials used in printing inks, etc. since 1990 at Plot no.A/62, M.I.D.C. Phase - I, Dombivali(E) Methyl Ethyl Ketone Peroxide (MEKP) must be used as the catalyst to begin the curing process. Catalyzation rates can be varied with polyester resins in order to adjust for various environmental conditions. In thin laminations or when gel coat is sprayed as a topcoat, the surface may remain tacky and not cure properly if left exposed to the air. To get a complete cure, thin laminations or top coats must contain either styrene wax solution of have a coat of polyvinyl alcohol (PVA) solution sprayed over them to seal out the air. With the former, the wax "floats" to the surface as the resin cures, acting as a barrier to the air. Styrene wax must be sanded off after curing, but PVA can be rinsed off with warm water.
Epoxy resins are not as forgiving in their measurement as polyester resins, but epoxies provide a greater part strength and dimensional stability. They also adhere to other materials better than polyester resins. Epoxy hardener ratios can't be varied, and adequate temperatures (at least 70 degrees F) must be maintained during the curing process. Epoxy resin systems tend to cost more than polyester resins, but they are a virtual necessity in some repair applications, such as with Sheet Molded Compound (S.M.C). Epoxy resins are also highly recommended for use with Kevlar® and carbon fibre.
The third type of resin, vinyl ester , possesses qualities that fall between polyester and epoxy resins for the most part. It excels above both, however, in the areas of corrosion resistance, temperature resistance (it's good to 300 degrees F), and toughness. Common uses include boat hull repair, full tank construction and chemical storage tank linings. Like polyester resin, it is catalysed with MEKP, but vinyl ester has a shorter three-month shelf life.
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