Features: 1) specification: &phi16 - 32 2) non-toxic, anti-corrosive 3) light weight, strong mechanical properties and thermal-resistant ability 4) low fragile humidity and long using life 5) low flowing resistance inside the pipe, scaling can rarely happen 6) the fluids cannot be contaminated. effective diameters are big 7) oxygen is 100% isolated and infiltration is thoroughly prevented. in case they are used as shielding materials for ecommunication circuit, magnetic interference can be prevented 8) anti-static, and suitable for gas and fuel transportation