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Pour molding machine polyurethane casting needle
A composite high and low temperature prefabricated insulation pipe is composed of a steel pipe, a polyethylene foam insulation layer, a heat radiation radiation isolation layer, a polyurethane foam insulation layer, a PE shell or a glass fiber reinforced plastic protection shell, and is characterized in that: ), A polyethylene foam insulation layer (2) is reinforced on the outer circular wall of the heat insulation radiation protection layer (3); a heat radiation radiation insulation layer (3) A polyethylene foam insulation layer (2) is additionally arranged on the outer circular wall, a polyurethane foam insulation layer (4) is additionally arranged on the outer circular wall of the polyethylene foam insulation layer (2) Foam insulation layer on the outer wall, made of a PE shell or fiberglass protection housing (5).