Fiberglass chopped

StarRov, Fiberglass roving, Johns Manville StarStran, Fiberglass chopped strand, Johns Manville... 

By far the most common form of reinforcement is fiberglass. Products using unsaturated polyester resin as a matrix and fiberglass fiber reinforcements are commonly referred to as composites , laminates or FRPs (fiber-reinforced plastics). The latter reinforcements are sold as continuous roving, which is continuously chopped in place with a liquid resin stream, chopped roving mat, woven... 

Consumption of unsaturated polyesters in the marine industry consists of broad usage for hulls, decks and numerous small parts such as hatch and engine covers. Hulls and decks are generally produced with unsaturated polyester resins and multiple layers of fiberglass cloth knits and chopped fibers. Most marine applications require the use of unsaturated polyester resin gel coats for exterior appearance and for protection from the elements. 

The only unique aspect of this type of ceramic work is the addition of chopped strands or small strips of fiberglass cloth to the wet clay body. This can be done with a rolling pin for flat or "slab"... 

Figure 51, Different types of glass fibers. (1) Continuous strand mat, (2) Surfacing mat, (3) Chopped-strand mat, (4) Woven roving). (Courtesy of Ownes Coming Fiberglass Corp.)...

Chlsnall, B. C. Thorpe, D. "RRIM-A Novel Approach Using Chopped Fiberglass." Proc. Annual Conference Reinforced Plastlcs/Composltes Institute, 1980, p. 35. 

U.S. Pat. Nos. 6,881,367 [56] and 6,890,637 [57] (both by Elk Composite Building Products) disclose a process of forming of a wood-thermoplastic composite material, comprising 25% by weight of 20-50 mesh wood fiber, 40% of plastic such as polyethylene or polypropylene, and 35% of chopped fiberglass of about 0.25-1 in. in length. 

Several specimens were prepared by molding Teflon powder with various levels of chopped fiberglass filler. The effect of filler level on the load is shown in Fig. 2. Also shown... 

Most commercial SRIM applications have been in general industry or in the automotive industry. The reinforcement material most commonly used has been fiberglass, due to the low cost. Fiberglass has been used in the form of woven cloth, continuous strand mat, or chopped glass. 

Table 2.27 Properties of Polyester Composites Reinforced by Continuous and Chopped Fiberglass...

Rovings are essentially untwisted bundles of fiberglass strands wound up in parallel on cylindrically shaped packages. They are used in open lay-up moldings, woven fabrics, rods, and tubes. Woven rovings are used for open lay and press moldings. Yams [1] consist of twisted yam bundles. Weaver yarns are used for electrical and aircraft laminates, insulating tape, window shades, and filtration applications. Their major use is in printed circuit boards. Chopped strand serves as a reinforcement in a variety of markets. For example, it is used to... 

Fourteen insulations were examined in this study. The insulations included three types of polyurethane, three varieties of polymethacrylimide, one polybenzimidazole, two polyisocyanurates, two polymetric isocyanate foams (one with chopped fiberglass reinforcement, one without), a modified isocyanate foam, and two insulation systems (one of polymeric isocyanate foam, one of toluenedi isocyanate foam, both with two vapor barriers and fiberglass reinforcement) ... 

Two foam insulation systems prepared by the A. D. Little Company of Cambridge, Massachusetts were also tested. These systems had two vapor barriers, one on the outer surface (Z/Z x and one at Z/Zj j x 0.62 (where Z is the distance into the insulation from the outer surface and Z the insulation thickness). Each vapor barrier was a laminate composed of one layer of mylar [0.013 mm (0.0005 in) thick], two layers of aluminum [0.025 mm and 0.013 mm (0.001 in and 0.0005 in) thick], another layer of mylar [0.013 mm (0.0005 in)], and a layer of dacron woven fabric [33.9 g/m (1.0 oz/yd )]. The two layers of mylar offer tensile strength, the two layers of aluminum resist gas diffusion, and the dacron cloth resists tearing. Both systems used foams which had chopped fiberglass added for reinforcement. One system used Sta-foam AA1602 (a toluenedi isocyanate), whereas the other used Upjohn 452 (a pol3nnetric isocyanate). As can be seen from Fig. 13b, both systems had fair thermal performance Initially, but the performance deteriorated rapidly with thermal cycles. 

Fourteen commercially available organic foam insulations were examined to determine their suitability for insulating liquid hydrogen tanks of subsonic hydrogen fueled aircraft. Materials investigated were polyurethane, polymethacryllmide, polyisocyanurate, polymetric isocyanate, polybenzamidazole, toluenedi isocyanate, and isocyanate foam. The test specimens included foams with chopped fiberglass reinforcements, flame retardants, and vapor barriers. 

The addition of chopped fiberglass reinforcement or flame retarding materials during foam formulation proved harmful to thermal performance and/or the useful life of the foams. Vapor barriers had little Influence on the thermal performance however, they enhanced structural integrity. 

Combinations of the thermoplastic polyetherimides with 10 to 40 wt% fiberglass reinforcement are very effective for increasing strength and modulus, as shown in Table 8.3. Heat resistance is shghtly increased too. The increase in stiffness is shown in Fig. 8.3, which compares modulus versus temperature for an unfilled BPADA-MPD-based PEI resin and blends with 10 and 30% short-chopped fiberglass. 

As also seen in earlier chapters, fiberglass reinforcements can be obtained in various forms, such as continuous roving, woven roving and chop-strand mats. The choice of configuration would largely depend on the selected... 

Glass Matte. Compared to woven cloths, glass matte reinforcement exhibits a more random orientation. Chopped strand matte consists of fiberglass strands that have been chopped into 1- to 2-inch lengths and distributed evenly. Continuous strand matte, as the name implies, consists of continuous strands of fiberglass in a random, spiral orientation. Glass matte is used in the core of CEM-3, which is used in relatively unsophisticated products. 

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