they started using pvc pipe for plumbing in 1970.
they started using pvc pipe for plumbing in 1970.
when did they start using pvc pipe for plumbing?
1970
polyvinyl chloride (pvc) was produced experimentally in the 19th century but did not become practical to manufacture until 1926, when waldo semon of bf goodrich co. developed a method to plasticize pvc, making it easier to process. pvc pipe began to be manufactured in the 1940s and was in wide use for drain-waste-vent piping during the reconstruction of germany and japan following wwii. in the 1950s, plastics manufacturers in western europe and japan began producing acrylonitrile butadiene styrene (abs) pipe. the method for producing cross-linked polyethylene (pex) was also developed in the 1950s. plastic supply pipes have become increasingly common, with a variety of materials and fittings employed.
plumbing
sleeping dragon (manoeuver)









































a sleeping dragon is a maneuver used by protesters to cause disruption. it involves handcuffs and pvc pipe: a series of protesters are handcuffed together through the pvc pipe, which precludes police from simply using bolt cutters to break the handcuffs. advanced variations include covering the pvc pipe with elements which might make it more difficult to break. examples include chicken wire, tar, and duct tape. another variation is filling a barrel with concrete and putting the pvc pipe through the barrel such that it cannot be accessed without first destroying all of the concrete.
sleeping dragon (manoeuver)