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All Categories > Composites & Finishing Materials > Fiberglass, Kevlar & Carbonfiber > Item # KR7533  
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Item # KR7533, KR 7533 Cloth

List Price List Price {quote} ( Quantity Discount Available )


Lightweight boat or tooling cloth in plain weave. 50" width, 5.85 oz. per sq. yd. As used on the KR aircraft. Threads per inch: 18 length x 18 width.
Price per 1 yard.





Specifications  · Fiberglass Information

Specifications

Type

Light Boat & Tooling

Sold by

YD


Fiberglass Information

The most basic structural material in building a composite aircraft is glass cloth. The use of glass in aircraft structures, particularly structural sandwich composites, is a recent development. Fiberglass cloths are available in different formulations. "E" glass (electrical is the most common all purpose glass), while "S" (high strength) glass is made for special applications. Glass cloth is available commercially in hundreds of different weights, weaves, strengths and working properties. Very few of these; however, are compatible with aircraft requirements for high strength and light weight. Even fewer are suitable for the hand-layup techniques developed by Burt Rutan for the homebuilder. The glass cloth featured here has been specifically selected for the optimum combination of workability, strength and weight Two types of glass cloth, a bidirectional cloth and a unidirectional cloth are used. Bid cloth has half of the fibers woven parallel to the selvage edge of the cloth and the other half at right angles to the selvage, giving the cloth the same strength in both directions. Uni cloth has 95% of the glass fibers woven parallel to the selvage, giving exceptional strength in that direction and very little at right angles to it. Bid is generally used for pieces which are cut at a 45° angle to the selvage, a bias cut, which enables the builder to lay Bid into contours with very little effort and provides the needed shear and torsion stiffness for flying surfaces. Uni is used in areas where the primary loads are in one direction, such as wing skins and spar caps. Multiple layers of glass cloth are laminated together to form the aircraft structure. Each layer of cloth is called a "ply". Glass cloth should be stored, marked and cut in a clean area with clean hands and clean tools. Glass contaminated with dirt, grease or epoxy should not be used. The area used for storing and cutting glass cloth should be separated from the aircraft assembly area because it will be exposed to foam dust, epoxy and other elements which can contaminated the cloth. A pair of good quality sharp scissors, felt-tipped marker, a straight board and a tape measure are needed for marking and cutting. The small amount of ink from marking and numbering plies has no detrimental effect on the glass cloth. Standard fiberglass cloth is exactly what the name says - glass. Fine fibers are spun from molten glass marbles, gathered into yarn and woven into a strong, supple glass fabric. It can be folded, rolled or draped, like any other loosely woven fabric - but it can be chemically transformed into solid sheets of tremendous strength. All the fiberglass fabrics listed below are volan treated for maximum strength and resistance to moisture and abrasion. They feature a weave that is tight enough for high strength, yet open enough for thorough wetting by resins. Fiberglass tapes have non-raveling selvage for glassing seams, corners, edges and repair jobs. Roving glass is a substitute for uni cloth for contours over spar caps, wings and elevators. It is made of roving glass held together with cross threads to avoid roving cross over.



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