Product Description

Material: borosilicate glass according to ISO***5 in ***4;Transmittance of borosilicate glass: 0.*4; Hemispherical emittance: 0.*8; Getter according to GB/T********8. Start-up temperature: No more than *5℃ Start-up time: no longer than 2 minutes under normal sunshine. Isothermal performance: the temperature tolerance between any 2 random points does not exceed 2℃ after 5 minutes of working. Low temperature resistance: No breaks at **0℃. Air pressure: P 5×***3Pa. Heat impact resistance: No damages after over 3 times’ alternative impacts of cold water below *5℃ and hot water over *0℃. Pressure resistance: can withstand 0.6 MPa. Hail resistance: no damage by the impact of ф*5mm hail. Appearance standard: the color of the selective absorptive coatings should be even, and the coatings should have no wrinkle and peelings. The support parts inside the tube should be correct and tight. The allowed tolerance of borosilicate glass tube’s diameter should be in accordance with ISO***3:***8. Camber of the borosilicate glass tube should be no more than 0.3%. The transection of the borosilicate glass tube, which is ****0mm away from flange end, should be round. The ratio of the longest to the shortest radial dimensions of borosilicate glass tube no more than 1.*2. The diameter of the heat exchanging end isф*4mm, and should be matchec with the standard