... 470mm, thicknessδ=0.32mmInsulated layer: adopting full-automatic constant temperature quantitative foaming process to manufacture the insulated layer(55 to ... 60mm), subjected to high-temperature curing treatment, compact and uniform cells, high thermal insulation ... more than ten yearsVacuum tube: Φ58*1,800mm double-vacuum solar collector tube, the product is a high-tech product ...