1. Borosilicate glass according to ISO3585: 1991; Transmittance of borosilicate glass: 0.92. Absorbance of solar selective absorptive coating: 0.94; Hemispherical emittance: 0.08; Getter according to GB/T9505-1998.
2. Start-up temperature: No more than 25Celsius.
3. Start-up time: No longer than 2 minutes under normal sunshine.
4. Low temperature resistance: No breaks at -30Celsius.
5. Heat impact resistance: No damage after over 3 time's alternative impact of cold water below 25Celsius and hot water over 90Celsius.
6. Pressure resistance: Can withstand 0.6Mpa.
7. Hail resistance: No damage by the impact of 25mm diameter hail.