... ' demand.3. Health, non-toxic, can be used for pure water, drinking water pipeline system, the product is a green ... layer of aluminum, the expansion co-efficient a samll metal pipe with considerable strength, toughness, impact resistance.5. Corrosion-resisitant, ... insulation: thermal conductivity of metal pipes1/200 only, hot water pipe insulation for excellent energy saving effect.8. Light weight, ...