Glass strand

AH forms and compositions of reinforcements, ie, mats, woven roving, glass, carbon, and aramid, are commonly used with these processes. Special continuous glass strand mats with a thermoplastic binder aHow preforms to be made using thermoforming techniques. These processes are used for tmck and autobody components, medical equipment cabinets, transportation seating, and other parts needed in the intermediate volume range (1,000—10,000 parts/yr). 

Process in which tubular products are fabricated through the application of resin and glass strand reinforcement to the inside of a mold that is rotated and heated. The process polymerizes the resin system. 

Sulfur-fiber composites have been prepared and studied by a number of workers. Rods have been prepared (8) by passing parallel orientated glass strands through molten sulfur under vacuum to form rein-foroed bars 150 mm long and 6 mm in diameter. Glass-fiber mats have been impregnated with sulfur also, the mat being covered with powdered elemental sulfur and then placed in an oven at 185 °C for 1.5 hr so that polymeric sulfur is formed. 

Just about any type of low or medium fire clay body can be used. The critical element is maintaining the heat of the firing kiln at or below Cone 6 (about 2174°F). At higher temperatures,the glass strands will melt and flow out of the clay, leaving voids and resulting in a very weak panel. 

FRU-M the prescribed amount of chopped glass strand (13 mm in length) was mixed with the prescribed amount of isocyanate-component and thoroughly dispersed before the addition of the polyol component. Then the following operations were carried out according to the procedure of FRU-L without strand mat. 

FRU-S Every operation was carried out according to the FRU-M using chopped -glass strand 3 mm in length instead of 13 mm. The physical properties of these foams wiU be discussed later. 

Another example of the two-dimensionally reinforced foamed composite was developed by Celotex Corp., USA. The production process consists of the use of continuous-glass-strand mat and a horizontal conveyer process. Continuous-strand mat is supplied on a moving horizontal conveyer. The foaming mixture is then applied onto the glass mat through the mixing head of a dispensing machine (35). 

The combined use of continuous-glass-strand mat as a core material and uniformly and monoaxially aligned continuous-glass fiber as the surface material has also been proposed (5, 25). The incorporation of expanded polystyrene copolymers into composites was proposed for shock-absorbing composites, such as bumper beam cores, knee bolsters, etc. (17, 18). 

Celotex Corp. (35) has commercialized foamed composites consisting of a urethane-modified isocyanurate foam and continuous-glass-strand mat. The trade name of the composite is Thermax. Some physical properties of Thermax are shown in Table 52. The physical properties of a low-density SRIM system of urethane-isocyanurate foam for interior-trim applications are shown in Table 48. 

Integral chopped fiber glass strands 1/8 In., and a hybrid of milled fiber glass and chopped strand. Six major panel properties were examined for surface... 

Type RC2ESI had epoxy polymer composition strengthened with glass strands along the tension side of the beam. 

Fiberglas . [Owens/Coming Fibeiglas] Chopped glass strand leiitftncements for plastics. 

Star Stran. [Schuller] G>ntinuous filament glass strand reinforcement for polypropylene, PPS, PEI. 

Milled Glass Filler - Milled glass fdlers are made by hammer-milling continuous glass strands. Used as anticrazing reinforcing fdlers for adhesives and in plastics. Also called milled glass fiber. 

Reinforced Structural Resins. Polyesters and polyepoxides are reinforced with E- or S-glass strands, mats, or cloth raising their tensile strength 10-20 times and their modulus of elasticity 10-100 times, approaching the properties of steel. Reinforced with graphite, boron, or the new poly-p-benzamide fiber or whiskers, novel composites surpass steel. 

Glass strand coated with PVC plastisol. [Data from Blanchard, B,Chuda,K,... 

Glass fiber forming package A single glass strand gathered on a thin-wall paper or plastic tube to be used in manufacture. 

Glass strand is normally measured by the number of 100 yards in 1 lb weight (for example, a 130 s count contains 13,000 yards per pound weight or the number of grams per kilometer, imder the international unit tex. Tex is a unit for expressing linear density equal to the mass of weight in grams of 1000 m of strand, fiber, filament, yarn, or other textile strand. 

E. Properties of chopped glass strand mat parallel lay-up with 40 wt% glass content... 

Glass strands are cut and dipped into a moving conveyer belt where a polymer binder is applied to hold the mat together. Mat weights vary from 0.75 to 3 oz./ft. in widths up to 10 ft. 

Types E and S glass are available as monofilaments, as roving (a series of parallel, untwisted glass strands, each strand composed of glass filaments), or as woven fabrics. These products are highly developed and are available with special finishes to ensure compatibility with various matrix resins. 

The assembled composite may be cured at room temperature or at elevated temperatures for faster cycles. This procedure, which was originally called contact molding, may be upgraded by the application of a vacuum or pressure bag placed over a Cellophane film on the final layer to reduce void formation in the composite. The laminate may also be built up by a spray-up process in which a mixture of chopped glass strands and catalysed resin is sprayed on the gel coat instead of resin-impregnated mat. In any case, the inner surface will be less smooth than the first layer formed by the gel coat. Tanks, boats and pipe may be fabricated by this technique. 

Milled Fibres—Continuous glass strands hammer-milled into small modules of filamentised glass. Useful as anticrazing reinforcing fillers for adhesives. 

---