The Diamond Standard Working Group was formally established in January 2007. The working group is the leading group and the drafting group. The leading group is mainly responsible for the coordination of the standards revision of the participating units and the progress of the work. The drafting group is mainly responsible for the specific revision of the standard drafting. jobs. The Standard Working Group established this standard revision work to meet market demand, and developed advanced standards that are in line with the development of the industry, can guide industry production, and promote trade exchanges at home and abroad. The working group held a number of standard coordination meetings to discuss the specific revision of various standards, to investigate the current technical level and market conditions of the domestic and international synthetic diamond industry, and to do a lot of experimental verification work. After more than a year, in addition to JB/T 7989-1997 "Technical Conditions for Superhard Abrasive Synthetic Diamond" is also supplemented with test data. The other four standards completed the drafting of the standard in July 2008, and sent the production and use units of the industry for comments. At the end of September 2008, the National Abrasives Standardization Technical Committee held a standard review meeting, which reviewed and approved four standards, which have been reported to the higher authorities for approval.
Residential Sectional Garage Door
A typical version of an overhead garage door used in the past would have been built as a one-piece panel.The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism. Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers. The door is balanced by either a torsion spring system or a pair of extension springs.A remote controlled motorized mechanism for opening garage doors adds convenience, safety, and security
• Aluminum garage doors are low-cost, light, rust-proof, and feature low-maintenance. They are prone to denting because aluminum is not strong and they are energy-inefficient since aluminum is a highly conductivematerial.
• Fiberglass and vinyl garage doors are composite units, combining a steel core behind a fiberglass or vinyl skin. They have also polyurethane insulated base sections, or other type of foam insulation. These premium doors can match steel garage doors, and be a realistic imitation of wood (namely fiberglass units), but they may be more expensive than steel units.
• Steel doors have become common and are available in a variety of sizes and styles, provide strength and security, are cost-competitive, and may have optional insulating value. Extra strength is available with two or three layers of galvanized steel with a low gauge number (23-24 gauge steel panels).
• Wood garage doors offer aesthetic appeal, but they are high-maintenance and may be expensive. Low-priced wood garage doors may warp and break easily.
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