Thomas Edison. Thomas Alva Edison (February 11, 1847 â October 18, 1931) was an American inventor and businessman, who has been described as America's greatest inventor. He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and the long-lasting, practical electric light bulb.
Pipe dope, or pipe joint compound, is a gooey compound used to seal the connection between threaded pipes and fittings. Because the threads in pipes and fittings still leave an air gap between the two surfaces, the gap must be filled to make it water tight (or gas tight for gas lines).
HDPE_physical-properties_v002 HDPE Physical Properties /10 Introduction High Density Polyethylene (HDPE) is a thermoplastic material which is supplied by the manufacturer in a âready to useâ pelletised form. The grades suitable for pipe manufacture are PE 63, PE 80 and PE100. The pipe manufacturer converts this material into pressure pipe.