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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 spraydeck (sprayskirt in N. America, akuilisaq or tuiitsoq in Greenland) is a flexible waterproof cover for a boat (in particular for a kayak or a canoe) with holes for the passengers' waists. Spraydecks are used to prevent water from entering the boat while allowing passengers to paddle or row.
Due to the closed-cell nature of rigid polyurethane foams, PUR insulation has minimal water absorption, which coupled with an appropriate cover, makes it a particularly suitable in applications where bacterial growth is a concern. Polyurethane insulation is suitable for insulating pipes with surface temperatures ranging from -196°C to 148°C. [7]
A few paddle steamers serve niche tourism needs as cruise boats on lakes [a] and others, such as Delta Queen, still operate on the Mississippi River. In Oregon , several replica paddle steamers , which are non-steam-powered sternwheelers built in the 1980s and later, are operated for tourism purposes on the Columbia and Willamette Rivers .
HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]
It is a transparent thermoplastic, used as an engineering plastic. PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others . This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass. It can ...
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