The Inoac standard copper pipes are wrapped with polyethylene resin.
Directly around the pipe, on the insulation layer, there's a 2nd layer hard polyethylene foam with an excellent heat resistance.
Fire retardant pipes are insulated with fire retardant polyethylene foam.
Pipes with fixed length are straight copper pipes with a wider end at one side.
Finally there are extra insulated pipes with a thicker insulation layer of 15 mm.