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By D.V. Scott

Hardbound. swift evolution is occurring within the water industry all over the world - pushed by way of elevated shopper call for allied to the rarefraction of fresh water. The inherent features of composites fabrics linked to present fabrics and creation expertise is permitting the elevated use of formerly excessive rate fabrics and methods at ever lowering expenditures. The instruction manual is designed to convey specifiers on top of things with those fabrics and the hot parts of program linked to them, exploring the scope, functionality, price effectiveness and environmental and legislative effects in their use.

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Extra info for Advanced Materials for Water Handling: Composites and Thermoplastics

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This type of glass is used throughout all structural laminates. 9 ECR-glass (electric corrosion resistant) offers improved chemical resistance over E-glass in many applications, is more expensive than Eglass and may be specified throughout the total laminate for some type of applications, usually in very severe conditions. 9 D-glass (dielectric) is, because of particularly good dielectric characteristics, used mainly in the electronics industry. 9 R- (Europe) and S- (North America) glass is stronger than E-glass, but is substantially more expensive, and finds little or no usage in the anticorrosion market.

In most cases, a structural laminate will be relatively porous, such that any high-pressure testing or sustained hydrostatic pressure will result in premature weeping of the laminate. It is obviously preferred to have a structural laminate which shows the lowest possible level of porosity, essentially to ensure satisfactory behaviour both in the long term and also should the inner liner receive some form of superficial damage. Some major manufacturers of pipe systems, particularly Smith Fiberglass Products Company, have, however, developed filament winding technologies, essentially for small to medium diameter anhydride- and amine-cured epoxy and vinyl ester pipes, which rely totally on the quality of the structural laminate, as these products have no inner liner whatsoever.

Woven rovings are also available using 'spun rovings', which increase the resistance of delamination of laminates using successive layers of woven roving. This type of material is, however, seldom used for corrosion-resistant FRP due to product specifications requiring alternative layers of chopped strand mat and woven rovings. A recent development from Vetrotex, amongst others, is the appearance of 'combination fabrics', an assembly of chopped strand mat and woven rovings, sewed together, and available in various different weights.

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