Polyethylene coated glass

Waterproof. Waterproofing barrier systems may be either hot- or cold-appHed. The hot-appHed generaUy involve a bituminous material such as asphalt used in conjunction with a reinforcing fabric such as roofing felt, cotton, or glass cloth. Cold-appHed can be bituminous or elastomeric materials either in Hquid or sheet form, with or without fabric reinforcement. Liquid elastomeric treatments include neoprene, polyurethanes, and blends of these or epoxies with bituminous materials. Among the commonly used precured elastomeric sheet materials are neoprene, polyisobutylene, EPDM mbber, and plasticized PVC. Polyethylene and PVC films and nonwoven plastic or glass fabric coated with bituminous materials also find use (78). Because these... 

Nonporous polyethylene or silicone materials Silicone rods or bars coated with silicone Glass fibers coated with a thin layer of various sorbent materials... 

It may, therefore, be concluded that fused silica and leached glass columns coated with polysiloxanes (OV-1, 0V-101, OV-73 and SE-54) and polyethylene glycols (Superox 20M) provide... 

Apparatus can be constructed in lead, copper, silver, or platinum, or, for more than 58 % HF, from steel paraffin-coated glass, polyethylene, celluloid, polychlorotrifluoroethylene, and polytetrafluoroethylene (Teflon) can also be used for reaction vessels. Glass dissolves rapidly in aqueous HF. 

Personal protective equipment and janitorial supplies — Several miscellaneous items are needed to clean up an area. Among these are plastic and metal buckets, mops, brooms, dust pans, large, heavy-duty polyethylene bags, kraft paper boxes (for broken glass), plastic-coated coveralls, shoe covers, duct tape, and an assortment of gloves. If not kept in an individual laboratory, at least one set should be kept on each hall or floor of a building. Custodians may have some of these materials, but they are not always available to laboratory personnel, especially outside normal working hours when many laboratories are active. 

Specimens can either be pre-fixed by suspension in fixatives such as formalin, or Saccomanno s Fluid (2% (w/v) polyethylene glycol, PEG 1500, BDH Ltd, in 50% ethanol). Alternatively the shdes may be post-fixed, usually in alcohol, acetone, or methanol for 10-20 minutes at room temperature. In all cases glass slides coated with some form of adhesive should be used (see Section 4.1 for more details of suitable shde adhesives). 

Corrosion. Anticorrosion measures have become standard ia pipeline desiga, coastmctioa, and maintenance ia the oil and gas iadustries the principal measures are appHcation of corrosion-preventive coatings and cathodic protection for exterior protection and chemical additives for iaterior protectioa. Pipe for pipelines may be bought with a variety of coatiags, such as tar, fiber glass, felt and heavy paper, epoxy, polyethylene, etc, either pre-apphed or coated and wrapped on the job with special machines as the pipe is lowered iato the treach. An electric detector is used to determine if a coatiag gap (hoHday) exists bare spots are coated before the pipe is laid (see Corrosion and corrosion control). 

The use of coatings applied in the form of tape is also increasing. Polyethylene and polyvinyl chloride films, either self adhesive or else supporting films of butyl adhesive, petrolatum or butyl mastic are in use as materials applied cold at ambient temperatures. Woven glass fibre or nylon bandage is also used to support films of filled asphalt or coal tar and these are softened by propane gas torches and applied to the steel surface hot, cooling to form a thick conforming adherent layer. 

In the special case of pipelines operating at relatively high temperatures such as for the transmission of heavy fuel oil at up to 85°C, heat insulation and electrical insulation are provided by up to 50 mm of foam-expanded polyurethane. As a further insurance against penetration of water, and to prevent mechanical damage, outer coatings of polyethylene (5 mm), butyl laminate tape (0-8 mm) or coal-tar enamel reinforced with glass fibre (2-5 mm) have been used. 

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