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Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Hemming is the process in which the edge is rolled flush to itself, while a seam joins the edges of two materials. [1] Hems are commonly used to reinforce an edge, hide burrs and rough edges, and improve appearance. [1]
Sheet moulding compound (SMC) or sheet moulding composite is a ready to mould glass-fibre reinforced polyester material primarily used in compression moulding. [1] The sheet is provided in rolls weighing up to 1000 kg. Alternatively the resin and related materials may be mixed on site when a producer wants greater control over the chemistry and ...
The Sheet Metal and Air Conditioning Contractors' National Association (SMACNA; pronounced 'Smack'-'Nah') is an international trade association with more than 4,500 contributing contractor members [1] in 103 chapters [2] throughout the United States, Canada, Australia and Brazil.
Lengths up to 16 feet (4.9 m) are common; the most common is 8 feet (2.4 m). Common thicknesses are 1 ⁄ 2 and 5 ⁄ 8 inch (13 and 16 mm); thicknesses of 1 ⁄ 4, 3 ⁄ 8, 3 ⁄ 4, and 1 inch (6, 10, 19, and 25 mm) are used in specific applications. In many parts of Canada, drywall is commonly referred to as Gyproc.
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In the United Kingdom, the usual size of a modern brick (from 1965) [46] is 215 mm × 102.5 mm × 65 mm (8 + 1 ⁄ 2 in × 4 in × 2 + 1 ⁄ 2 in), which, with a nominal 10 millimetres (3 ⁄ 8 in) mortar joint, forms a unit size of 225 by 112.5 by 75 millimetres (9 in × 4 + 1 ⁄ 2 in × 3 in), for a ratio of 6:3:2.
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