Isophthalic Resin is a medium viscocity, Unsaturated Polyester Resin based on Isophthalic acid. It is specially designed for corrosion resistant applications. It exhibites excellent mechanical properties along with good chemical resistance compared with other isopthalates and orthophthalates.
Iso-Resin rapidly wets the surface of glass reinforcements resulting in fast curing and a tack free surface. It is recomended for moderate chemical resistance applications. At moderate temperatures, the resin has good resistance to water, acids (dilute to medium concenterations), weak bases and good resistance to petroluem solvents like vessels, tank linings, ducting, fume hoods and many other applications requiring good chemical resistance and superior mechanical strength compared to orthophthalates.
Isophthalic Gelcoat & NPG Based Isophthalic Gelcoat
Gelcoat is a thixotropic version of Polyester Resin. It is generally a tough and rigid resin. The resin is generally pigmented and applied to a cold mould surface prior to the moulding or lay up operation.
This pigmented layer then co-reacts with the moulding resin during the curing cycle to become an integral part of the moulded product. Gelcoat thus provides continuous coloured surfaces without any subsequent finishing operation. Since it reproduces the mould surface exactly, the gelcoating procedure eliminates the fibre pattern which is sometimes objectionable in reinforced polyester parts. The Gelcoat will produce a mirror image of the mould surface and it is possible to produce anything from a porcelain-like finish to a grained textured pattern.
The resin vehicles for Gelcoat formulations can be varied over the broad range of properties possible with polyester systems, depending on the type of the service required of the finished moulding. Gelcoat finishes are currently being widely used on boats, bath tubs, automobile and truck parts, furniture, luggage, swimming pools, chemical storage tanks and a variety of similar items.