Insulated pipe

While polyurethane has outstanding mechanical and thermal properties, the high toxicity of the [diisocyanates] required for its manufacturing has caused a restriction on their use.

[2] This has triggered research on alternative insulating foam fitting the application,[3] which include polyethylene terephthalate (PET) [4] and polybutylene (PB-1).

[5] The outer casing is usually made of high-density polyethylene (HDPE).

Both standards don't give "short names" or abbreviations for described pipes.

Both standards require use of polyurethane foam for thermal insulation and HDPE for casing.