UNSATURATED POLYESTER RESINS Orthophthalates Isophthalates Superior Grades
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Isophthalates  

Isophthalic Resin
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.

NPG Based Isophthalic Resin
It is a medium viscosity Unsaturated Polyester Resin based on Isophthalic acid and Neo Pentyl Glycol (NPG) dissolved in styrene monomer. It is specially designed for Marine Application. It exhibits excellent
mechanical properties along with good chemical and weather resistance compared with other isophthalates and orthophthalates. The FRP components manufactured by using it exhibit excellent hydrolytic stability and resistance to outdoor weather.

It is approved by the Indian Register of Shipping (IRS) for use in marine environments. It rapidly wets the surface of glass reinforcements, resulting in fast curing and a tack free surface. It is recommended for most acids of dilute to medium concentrations. It is suitable for the manufacture of Boats, Cooling Towers, Wind Turbine blades, Dish antannaes, Pipes, Storage tank, etc.

Terephthalic Resin
Terephthalic Resin is a terephthalic acid based resin, with medium to low reactivity and minimum viscocity. It is recomended for acid resistance applications below 50oC. The corrosion resistance properties of terephthalates are on par with isophthalates and mechanical properties being slightly inferior to isophthalates but superior to orthophthalates. This resin is slightly hazy in appearence due to the high crystalline nature of terephthalic acid. The chemical and mechanical properties are not affected due to the haziness of the resin. The thermal and weathering propertties of the laminate were found to be better than laminates fabricated with isopthalates. It is suitable for manufacturing of pipes, storage tanks and vessels, lining of tanks, ducting, fume hoods and many other applications requiring good chemical resistance and superior mechanical strength compared to orthophthalates.

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Different Grades of Unsaturated Polyester Resin
ISOPTHALATES STD PKG
RESINS RATE GELCOATS RATE

35

1

ISO RESIN ISO GELCOAT

35

2

ISO BOAT GRADE ISO BOAT GELCOAT

35

3

ISO UV GRADE ISO UV GELCOAT

35

4

ISO NPG GRADE ISO NPG GELCOAT

35

5

ISO CLEAR GRADE  

6

ISO FIRERETARDENT ISO FR GELCOAT

35

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