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Unplasticized polyvinyl chloride pipe for underground water mains. uPVC or PVC-U, is a thermoplastic material derived from common salt and fossil fuels. The pipe material has the longest track record of all plastic materials. The first uPVC pipes were made in the 1930s.
Polyvinyl chloride is formed in flat sheets in a variety of thicknesses and colors. As flat sheets, PVC is often expanded to create voids in the interior of the material, providing additional thickness without additional weight and minimal extra cost (see closed-cell PVC foamboard). Sheets are cut using saws and rotary cutting equipment.
Early on, the health and environmental aspects of this were poorly understood and replacements and product bans resulted after studies. The original form is often referred to as unplasticized polyvinyl chloride (uPVC), which is the more commonly used type for installations such as water, waste, and sewer conveyance plumbing.
Vent pipe of a wide variety of materials are used, for example polyvinyl chloride (PVC), unplasticized PVC, bricks, etc. Whatever material is used, durability (including corrosion resistance), availability, cost and ease of construction are important factors.
ISO 3114:1977 Unplasticized polyvinyl chloride (PVC) pipes for potable water supply — Extractability of lead and tin — Test method ISO 3115:1981 Castings in magnesium alloys containing zirconium — Chemical composition and mechanical properties [Withdrawn: replaced with ISO 16220]
ISO 264:1976 Unplasticized polyvinyl chloride (PVC) fittings with plain sockets for pipes under pressure — Laying lengths — Metric series [Withdrawn: replaced with ISO 1452-3] ISO 265 Pipes and fittings of plastics materials — Fittings for domestic and industrial waste pipes — Basic dimensions: Metric series
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