... tube and heat pipe technology, providing high efficiency solar thermal conversion. Certified to international standards, we ... copper,ultrasonic weldingCoatingblack chromeAbsorptance≥95%±2%Emittance≤10%±2%Absorber material & thicknesscopper T2, δ=0.15mmheader pipe ... 3mm/embosseo aluminum backsheet:0.3mmCover sealing materialmetal/EPDM+metalPackingneutral cartonpacking dimension(2 pieces in 1 carton ...