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An additional benefit of the coating was it acted as a sound dampener, containing the U-boat's own engine noises. [1] Alberich tiles as they appear on U-480. The coating had its first sea trials in 1940, on U-11, a Type IIB. [1] [5] U-67, a Type IX, was the first operational U-boat with this coating. [2]
Marine canvas is typically used to protect materials susceptible to UV damage like varnished wood, non-UV resistant plastics, and outdoor stored sails. Other boat specific uses include hatch covers for interior sun protection and winch covers for protection from deterioration and fouling due to seawater, rain, and dirt exposure. [5]
A SAP's ability to absorb water depends on the ionic concentration of the aqueous solution. In deionized and distilled water, a SAP may absorb 300 times its weight [4] (from 30 to 60 times its own volume) and can become up to 99.9% liquid, and when put into a 0.9% saline solution the absorbency drops to approximately 50 times its weight ...
Water-logging commonly occurs over a long period in polystyrene foams that are constantly exposed to high humidity or are continuously immersed in water, such as in hot tub covers, in floating docks, as supplemental flotation under boat seats, and for below-grade exterior building insulation constantly exposed to groundwater. [60]
In the last case, the material is properly called silica xerogel. Silica xerogel with an average pore size of 2.4 nanometers has a strong affinity for water molecules and is widely used as a desiccant. It is hard and translucent, but considerably softer than massive silica glass or quartz, and remains hard when saturated with water.
Moisture-wicking clothes adsorb the liquid sweat on the skin and spread it along the surface of the fibres by capillary attraction to the external surface of the clothing, which is exposed to drier air, and where it evaporates more quickly, in comparison with a clothing item which absorbs and retains the water in the fibres. Hence it avoids ...
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