Compressed materials are manufactured in a process that combines water, latex, fibers, fillers, and chemicals to form a slurry, which is calendered using a large heated roller and a smaller cold roller. The slurry is layered on the hot roller until it reaches the desired thickness. Compressed materials tend to have a high density and tensile strength, with a tighter compressibility range than Beater-Addition materials. Compressed materials may also be reinforced with wire mesh or expanded metal for additional strength.
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Beater-Addition materials are manufactured in a process that combines water, latex, fibers, fillers, and chemicals to form a slurry which is processed through a system of rollers to form a solid continuous roll of material in various gages. Higher temperature materials typically utilize aramid fibers, while lower temperature grades are usually made of cellulose fiber. Some grades also have a dispersion of fine cork granules.
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Vegetable Fiber materials
Vegetable Fiber materials are made in a similar process combining vegetable fibre efficiently saturated with a glue-glycerine impregnant. Midwest stocks thicknesses from .006" through .125".