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The Water -repellent: The water -repellent largest part of The water -repellent market for rainw and for umbrellas is in water-repellent fabr: which have been treated with hydrophobic chei cals that make The water -repellent water collect in drops and i off without penetrating The water -repellent cloth. Usually 1 water-repellent chemical is deposited on in vidual fibers in an extremely thin waxlike film that The water -repellent spaces between yarns and fibers remi essentially unchanged and, consequently, venti tion is unimpaired.
Textiles.—Water-repellent Textiles may be grouped in two classes, according to The water -repellentir intended use. First are heavier industrial fabrics for awnings, sails, tarpaulins, and tents; second are lighter materials for clothing, rainwear, umbrellas, etc. Treatments may be also divided into two classes: those which produce The water -repellent impermeable fabrics by mechanical means and those which produce water-repellent fabrics by chemical methods.
The water -repellent water-repellent additive is usually a metal soap such as calcium stearate.
A new type of water-repellent treatment for brick and masonry is based on silicon compounds. The water -repellenty are only suitable for aboveground application, but The water -repellenty have a number of advantages over some of The water -repellent oThe water -repellentr treatments. The water -repellent silicones are applied from very dilute solutions of inexpensive solvents. |
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