... tube in the north.High decalescence , low heat loss, this is particularly suitable for cold areas (super-insulation) ... low-loss advantages of the same remarkable results in a frigid environment collector.Corrosion resistance and long ... 3.3*10-6 ° C, in line with international ISO1776 anti-acid level, ISO695 alkali A2 level, excellent mechanical properties, hardness.Efficient all endothermic (super ...