4.2　Raw materials

4.2.1　Unsaturated polyester resin，vinyl ester resin and epoxy resin should be selected for fibre reinforced plastic equipment and piping.When other types of resins are selected，their properties shall be determined by testing.

4.2.2　Resins used for fibre reinforced plastics equipment and piping shall be in accordance with the following requirements：

1　Resin shall meet the working conditions and forming process requirements；

2　Resin shall be matched with reinforcement material；

3　The same resin should be chosen for lining and structural layer；

4　Unsaturated polyester resin and vinyl ester resin shall be matched with the initiator and accelerator selected；

5　Epoxy resin shall be match with the selected curing agent.

4.2.3　The quality of the resin shall be in accordance with the following requirements：

1　The quality of unsaturated polyester resin shall meet the relevant requirements of current national standard GB/T 8237 Liquid Unsaturated Polyester Resin for Fibre Reinforced Plastics ；

2　The quality of vinyl ester resin shall meet the relevant requirements of current national standard GB/T 50590 Technical Code for Anticorrosion Engineering of Vinyl Ester Resins ；

3　The quality of epoxy resin shall meet the relevant requirements of current national standard GB/T 13657 Bisphenol-A Epoxy Resin ；

4　The properties of resin casting body should be in accordance with those specified in Table 4.2.3：

5　The corrosion resistance of the resin may be determined by the corrosion resistance data of the resin，existing application experience，coupon or laboratory test and verification，etc.The evaluation method shall meet the requirements of Appendix A of this code.

4.2.4　Glass fibre and its products，carbon fibre and its products，synthetic fibre and its products should be selected as reinforcement materials for fibre reinforced plastic equipment and piping.When other types of reinforcement materials are selected，their properties shall be determined by tests.

4.2.5　Reinforcement materials for fibre reinforced plastic equipment and piping shall be in accordance with the following requirements：

1　Reinforcement materials shall meet the requirements of working conditions and molding process；

2　The coupling agent used in fibre surface treatment shall be matched with resin；

3　The type of fibre reinforced material used for the connection between the equipment cylinder and pipeline shall be the same as the reinforcement materials of the equipment cylinder and pipeline.

4.2.6　Glass fibre and its products should be chosen chopped strands mat，woven roving，winding filament，gun roving，woven fabrics，surface veil，and the quality of which shall be in accordance with the following requirements：

1　The quality of chopped strand mat shall meet the requirements of the current national standard GB/T 17470 Glass Fibre Mats-Chopped Strand and Continuous Filament Mats ；

2　ThequalityofwovenrovingshallmeettherequirementsofcurrentnationalstandardGB/T 18370 GlassFibreWovenRoving ；

3　The quality of winding filament and gun roving shall meet the the requirements of current national standard GB/T 18369 Glass Fibre Roving ；

4　The quality of woven fabrics shall be in accordance with the the requirements of current national standard GB/T 25040 Glass Fibre Stitched Fabrics ；

5　The percent moisture content of surface veil shall not be larger than 0.2％，and the mass per unit area should be（30—50）g/m ² .

4.2.7　The quality of carbon fibre and its products shall meet the relevant requirements of current national standard GB/T 26752 PAN-Based Carbon Fibre ，and GB/T 30021 Warp Knitting Carbon Fibre Reinforcements .

4.2.8　Under the condition of different corrosive medium，the reinforcing materials of lining and outer surface of fibre reinforced plastics equipment and piping should be selected according to Table 4.2.8.