High Quality Solar vacuum Tube:
1.high-activity: solar spectral absoprtion increased 14%,reflectance reduced by 30-40%
2.high heat conductivity:Heat-resistant 200°C or so, anti-Alpine, minus 3 °C can keep heating.

3.high vacuum:Vacuum maintained against decay, improve performance and stability,and long time warranty to 15years. 

 Main Advantages of SG Collector Tubes: 

1.No scaling

2.No blasting

3.water-tight

4.Anti aging

5.low temperature-resistant

6.high temperature-resistant

7.fast heat transfer

8.high heat conductivity

9.bearing pressure