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In many countries such as Australia and in some American states such as California, traffic barrels are rarely seen; pillar-shaped moveable bollards are instead used where larger and sturdier warning or delineation devices are needed. Typically, bollards are 1,150 mm (45 in) high fluorescent orange posts with reflective sleeve and heavyweight ...
Permanent bollards can be used for traffic-control or guarding against vehicle-ramming attacks. [10] They may be mounted near enough to each other that they block ordinary cars/trucks, for instance, but spaced widely enough to permit special-purpose vehicles, bicycles, and pedestrians to pass through.
PVC/CPVC – rigid plastic pipes similar to PVC drain pipes but with thicker walls to deal with municipal water pressure, introduced around 1970. PVC stands for polyvinyl chloride, and it has become a common replacement for metal piping. PVC should be used only for cold water, or for venting. CPVC can be used for hot and cold potable water supply.
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Plastic is the generic name for a family of synthetic materials derived from petrochemicals.It is often product of two or more components. There are many families of plastics and polymers being used in construction industry, such as acrylics, composites, expanded polystyrene, polycarbonates, polyethylene, polypropylene, and polyvinyl chloride.
The lawsuit claimed that in spite of this knowledge, the defendants concealed the information and continued to market these products (Shell supplying PB resins to water pipe manufacturers and Hoechst Celanese providing acetal resins to manufacturers of pipe fittings) until approximately 1996. [32] The lawsuit was settled in 1995 for US$950,000,000.
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