Properties of typical 4 mm thick hand lay-up GRP laminate are:

Glass Content 450 gms/sq m / mm
Impact Strength +40 to 45 KJ/ sq m
Tensile Strength +75 to 80 N/mm
Density 1.6 to 1.8 gms/cubic cm
Bar of hardness 45-50
Pigmented gel coats Ultra violet stabilized colour fast, no fading
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Fire properties ( the Surface spread of flame): Class 3 with general purpose resin as per BS476 Part 7, with special resins Class1 can be achieved.
Heat and sound insulation
Translucency and colour impregnation

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