... CE,ISO. 2. 0.68~0.73 premium conversion Vacuum tube solar collectors -- Keymark/EN-12975,SRCC,ISO,CE ... materialAnodized aluminum alloyManifold header pipeTU2 copperInsulation layerCompressed rock wool.VACUUM TUBESTube structureAll-glass double deck co-axial structureGlass materialHigh ... .3485.382/198JXSC-58-3058x1800mm302.824.630.4210466/160 Vacuum tube solar collectors -- Keymark/EN-12975,SRCC,ISO, ...