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In general, acrylic sheet scratches easily and retains a static charge, which can be problematic when framing pastels or charcoals. Some manufacturers, add dyes to acrylic glass to filter the UV light transmittance, and its surface can also be treated with both anti-static and anti-reflective coatings .
The type of acrylic used in tanning beds is most often formulated from a special type of polymethyl methacrylate, a compound that allows the passage of ultraviolet rays. Sheets of PMMA are commonly used in the sign industry to make flat cut out letters in thicknesses typically varying from 3 to 25 millimeters (0.1 to 1.0 in).
Cast acrylic has a better ability to be reworked hot and it is known for its superior surface finish and optical properties. Also cast acrylic is more scratch resistant than extruded acrylic. Cast acrylic is also preferred over extruded in applications that require machinings, such as turning on Engine Lathe or milling/drilling.
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]
A substrate primer may also be used as a bonding agent between the adhesive and the substrate. Thicker edge bandings typically require a slight concavity to provide a tight glue line. The thickness can vary from .018 in (0.46 mm) to 0.20 in (5 mm) or even more. The machine that applies the edge banding is called edge bander.
By the 1970s, the Occupational Safety and Hazard Administration (OSHA) was established and began issuing standard updates for fall protection in the construction industry. In 1994, OSHA also issued Subpart M Fall Protection Standard which required roof edge protection to be in place where employees were working six feet or more above a lower level.
Ohms Per Square < 10 −3: 10 −3 to 1 : 1 to 10 3: 10 3 to 10 6: 10 6 to 10 9: 10 9 to 10 12 > 10 13: Material Metals: Carbons: Shielding Conductive Static Dissipative Anti-Static Insulative ...
These discs are produced by injection-molding polycarbonate into a mold cavity that has on one side a metal stamper containing a negative image of the disc data, while the other mold side is a mirrored surface. Typical products of sheet/film production include applications in advertisement (signs, displays, poster protection). [6]
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