Raw Materials
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1. Glass Reinforced Polyester
The glass reinforced polyester is a thermo stable composite made with a resin base which is impregnated by glass fibre.
 It is a product which has been used a lot of years and in large sectors: tanks, plates, panels, grilles, pipes, components in car industry, aeronautics industry, renewable powers (air generators,…) due to its little weight, mechanical characteristics, its useful life and its aptitude to contain certain products.
The high mechanical conditions, joined to resistance to corrosion and the low rate of thermal conductivity makes GRP a suitable material in the manufacture of these tanks.
The resistance of glass fibre to traction joined to the resistance of resin to compression makes this mixture an ideal body to bear the solicitations to flexion, traction, compression and cutting effort to what the tank will be subjected during its operative life and manipulation.
The appropriate election of the kind of resin ensures without any maintenance the resistance of the tank against corrosive agents of the environment and of the product to contain. In order to do that, the manufacturer of resin provides diagrams to know which kind of resin must be used depending on the product, temperature and concentration.
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2. Polyester Resins
 In the market there are two big groups of plastic materials: thermoplastics and thermo stables.
In low temperature, plastics called thermoplastics are showed in solid state. Any piece can be manufactured heating the appropriate mould. This process can be repeated in order to take advantage of the moulded piece by recycling the material and changing it with the appropriate mould.
Among the well-known thermoplastics we find the PVC, Nylon, ABS, PE, PP, PES and so on, which are moulded by injection, extrusion, blown and so on.
Thermoplastics have an excellent chemistry resistance, but they have mechanical properties which can not compete against thermo stable materials, above all at high temperatures.
 Thermo stable plastics and, specifically, polyester resins, are supplied in a viscous liquid shape, which is changed from a liquid state to a solid one by the addition of chemistry products (accelerators, catalysts and so on).
Among the characteristics of resins:
• Excellent dimensional stability.
• Exceptional resistance to chemistry aggressive environment.
• Excellent electric properties.
• Resin cure at room temperature.
• Application of pressure is not necessary for the transformation and to give shape.
• Possibility of moulding big and complicated pieces at competitive prices in a little and average scale of manufacture.
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3. Glass Fibre
 When polyester resins are used on their own, they have a high resistance to compression and high temperatures, but they are fragile and have low resistance to traction and less to flexion.
Glass fibre is the most used reinforcement, which must be treated by a coupling agued (preparation of outer coat of fibres) in order to join the resin.
 Mechanical resistance is directly proportional to the amount of fibre. Glass fibre is obtained from the fusion of sand, kaolin, lime, colemanita in a furnace. According to the later process of fibred and of the applied coupling agued, the glass fibre shows several commercial shapes:
- Mat of cut yarns: blanket of yarns of lower length than 5 mm.
- Mat of continuous yarn: blanket obtained from only one yarn.
- Grinded fibre.
- Roving: filament assembled
- Crossed cloth: Roving spinning in two perpendicular directions.
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