About FRP Pipies
RTRP stands for Reinforced Thermosetting Resin Pipe and FRP stands for Fiberglass Reinfoced Plastic Pipe. FRP is a composite material consisting of a thermosetting polymer, often a type of polyester, reinforced with glass or other fibers. Glass fibers provide strength and stiffness to a composite material. Different types of resins are used for the manufacturing of RTRP pipes, which are selected according to the required properties like chemical resistance, temperature resistance and mechanical properties. The properties of FRP pipes can be varied by changing the ratio of the raw materials. According to the type of resin used, FRP pipes can be classified as;
- GRP - Glass Reinforced Polyester (Isophthalic resin)
- GRV - Glass Reinforced Vinylester (Vinylester resin)
- GRE - Glass Reinforced Epoxy (Epoxy resin)
Fiber glass composites consists of glass fiber reinforcements, thermosetting resins and additives, designed and processed to meet the specific functional performance criteria ;
Fiber glass reinforcements:
The amount, type and orientation of the glass fibers in the pipe provides the required mechanical strength. C-Glass, E-Glass and ECR-Glass are used commonly, depending on the application of the pipe. The various forms of glass reinforcements are surface veil, chopped strand mat (CSM), continuous roving and woven roving.
Isophthalic, Vinylester and Epoxy are the common type of resins used. This will provide the thermal and chemical properties such as glass transition temperature, resistance to heat, chemical resistance etc. required for the finished product.
Auxiliary raw materials:
Raw materials like catalyst, accelerators, inhibitors, aggregates and pigments are used together with resin and glass reinforcements to achieve the desired properties of the fiber glass product. Catalyst is an organic compound which when added to resin in presence of an accelerator determines the polymerization reaction at ambient temperature. Accelerator is a chemical compound used together with a catalyst to shorten the polymerization time. Inhibitor is added to the resin to reduce its reactivity at ambient temperature.
Different types of resins are used, leading to the following caterogies:
GRP Using Isophtalic Resin is structural wall and Isophtalic in liner (where applicable). For both underground and aboveground applications, restrained and non-restrained systems, in media temperature upto 60 deg.C.
GRV Using Vinylester Resin throughout. For Industrial application where specific chemical resistance is required. Used mainly in aboveground applications in media temperature upto 85 deg.C.
GRE Using Epoxy Resin throughout. For industrial application in media temperature upto 120 deg.C. Additional external protection can be applied to allow for additional fire-retardance.
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