Sealed in the test pressure is below ambient pressure 10 ± 0.5KPa, growth must be ≥ 0.8mm thickness of hollow glass, the pressure was kept at 2.5, the thickness of the growth bias <15% of all samples does not allow leakage leakage ※ The dew point temperature dropped to the dew point ≤-40 degrees, dew point instrument in contact with the surface of the sample 3min entire inner surface of the sample with no condensation or frost ※ surface may not have fogging and ultraviolet radiation ultraviolet radiation contamination within the sample traces 168h convective transfer is due to the temperature difference between the both sides of a glass having a lowe hollow glass, causing air in the cold side of the hot side of the fall and rise in the hollow glass 5mm, generating air convection, caused by the loss of energy. The reasons for this phenomenon are a few: First, poor sealing glass and the surrounding frame system, causing gas inside and outside the window frame can be exchanged between convection, resulting in the loss of energy; Binzhou hollow glass | Yaohui preferred glass | hollow glass roof provided by Jinan Glass Co., Ltd. Yaohui. Binzhou hollow glass | Yaohui preferred glass | hollow glass roof Jinan Yaohui Glass Co. (www.jyhhc.com/) this year introduced a new upgrade, the above picture is for reference only, please call the contact picture on this page or telephone obtain the latest information, contact: Liang Jingli.