ASTM Standard D2657, 2007, "Standard Practice for Heat Fusion Joining of Polyolefin Pipe and Fittings", ASTM International, West Conshohocken, PA, 2007, doi10.1520/D2657-07, www.astm.org.
ASTM Standard F2620, 2009e1, "Standard Practice for Heat Fusion Joining of Polyethylene Pipe and Fittings", ASTM International, West Conshohocken, PA, 2009, doi10.1520/F2620-09e1, www.astm.org.