Section 6-77-88 - Plastic pipe(a) General. A plastic pipe joint that is joined by solvent cement, adhesive, or heat fusion may not be disturbed until it has properly set. Plastic pipe may not be joined by a threaded joint or miter joint.(b) Solvent cement joints. Each solvent cement joint on plastic pipe must comply with the following: (1) The mating surfaces of the joint must be clean, dry, and free of material which might be detrimental to the joint;(2) The solvent cement must conform to ASTM Specification D 2513; and(3) The joint may not be heated to accelerate the setting of the cement.(c) Heat-fusion joints. Each heat-fusion joint on plastic pipe must comply with the following: (1) A butt heat-fusion joint must be joined by a device that holds the heater element square to the ends of the piping, compresses the heated ends together, and holds the pipe in proper alignment while the plastic hardens;(2) A socket heat-fusion joint must be joined by a device that heats the mating surfaces of the joint uniformly and simultaneously to essentially the same temperature; and(3) Heat may not be applied with a torch or other open flame.(d) Adhesive joints. Each adhesive joint on plastic pipe must comply with the following: (1) The adhesive must conform to ASTM Specification D 2517; and(2) The materials and adhesive must be compatible with each other.(e) Mechanical joints. Each compression type mechanical joint on plastic pipe must comply with the following: (1) The gasket material in the coupling must be compatible with the plastic; and(2) A rigid internal tubular stiffener, other than split tubular stiffener, must be used in conjunction with the coupling.[Eff ] (Auth: HRS § 269-6) (Imp: 49 C.F.R. §192.281, OCT 1, 1990)