... , SRCC, CE,SABS, ISO9001 3vacuum tube heat pipe 4heat pipe 5 58*1800 heat pipe solar collectors 1. Spcification of solar collector out casing: aluminium alloy inner manifold ... tube: 58*1800mm, ALN/AIN-SS/CU 1.6mm thickness heat pipe: red copper, anti-frizen, 1700mm length frame: aluminium alloy angle ...