This is a class 3442 750 N concrete cast certified 20 mm pipe is PP plastic, elastic, non-flammable, LSZH certified electrical installation pipe. The color is dark grey. The pipe has markings every meter. The 20HF ICTA wave series pipe is designed for normal conditions like detatched housing. The pipe has a regular ridged structure that's designed for low friction. In the lower parts of a roofs upper layer the pipe slides smoothly and won't get caught in the structure. The pipe won't release toxic gas in a fire, is LSHZ certified and compatible with public buildings.The pipes are up to IEC/ EN 61386-22 IEC/EN 61386-23 IEC 61034-2 EN 50267-1 EN 50267-2-2 standards, PBDPO free, environmentally friendly, Low Smoke Zero Halogen and environmentally friendly in flammable situations. Use and handling temperatures are -25°+90° for the pipes. The regular package size is a 100 meter plastic wrap package.