... high transmittance for heating 10years assurance Quotation of the all copper core solar flat panel Model SJW-P1SJW-P2SJW-P3Heating core ... .60,copperTP2Material of riser tubeφ10*0.50, copper TP2φ10*0.50,copperTP2φ10*0.50,copperTP2Absorb heater film layer1.selective absorb paint ... fin thickness is 0.15mm,copper TP2 thickness is 0.15mm,copper TP2 thickness is 0.15mm,copper TP2 Qty. of fins 8pcs8 ...