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Glass Reinforced Plastic (GRP)

Glass Reinforced Plastic ( GRP ) combines polyester resin and chopped glass fibre. AS/NZS 4256.3 requires sheets to contain a minimum of 22% glass fibre by mass and to be marked with their classification and weight.
GRP is suitable for in-service temperatures of -10° to 70°C and some GRP sheets are available in a fire resistant grade.
GRP should have a minimum thickness of 1.1 mm, but it is available up to 3 mm thick.

GRP Weight in g/m²

mm=g/m²
1.1
1.2
1.3
1.5
1.9
2.1
2.5
3.0		 1800
2000
2100
2400
3000
3300
4000
4880
(optional caption)
The exterior surface of GRP is covered with either a polyester film or a layer of gel-coat cast as the sheet surface. Sheets can have a film or a coating on one or both sides or have a film on one side and a coating on the other. The performance of GRP is related to both light transmission and durability of the various films, and coatings can provide different performance for each category in different environments.
N.B. Performance in both of these areas is not necessarily directly related.
The roofing contractor must ensure that the correct weathering surface of plastic sheeting is placed uppermost as the durability and warranty depend on placing the sheet the correct side up.
Clause: 
011_002_001_000_000_000_000_000_000
Clause Number: 
11.2.1
/cop/natural-light/natural-light-materials#glass-reinforced-plastic
Draft Clause: 
010_002_001_000_000_000_000_000_000