... of aluminum, the expansion co-efficient a samll metal pipe with considerable strength, toughness, impact resistance.5. Corrosion-resisitant, non ... conductivity of metal pipes1/200 only, hot water pipe insulation for excellent energy saving effect.8. Light weight, high strength: ... high-quality copper insert, safe and reliable.12. Long time life: the pipeing system under normal use life of up to 50 years. ...