Standard vacuum tube : Vacuum tube:
3.3high borosilicate glass
the absorption rate is 0.90-0.93 (AM1.5)
the emission rate is 0.05-0.075 (80℃±5℃)
vacuum tightness is P≤5.0*0.0001Pa
idle sunning property parameters is Y=220-260㎡.℃/KW
the average heat loss coefficient is Ult=0.6-0.7W(㎡.℃)

Standard Vacuum Tube
Single target all glass vacuum tube property and specifications
Structure	All Glass twin tube Co-axical Structure
Glass Material	High borocillicate 3.3 Glass
External Pipe Diameter and thickness		∮=58mm±0.7mm & thickness=1.6mm
Internal Pipe Diameter and thickness		∮=47mm±0.7mm & thickness=1.6mm
Pipe Length		1500mm, 1800mm
Absorptive Coating Property	Structure	AL/AL-ALN(H)/AL-ALN(L)/ALN
	Sediment Method	Single target magnertron sputtering plating
	Specific Absorption	as=0.90～0.93(AM1.5)
	Emmision Ratio	∈h= 0.05～0.075 (800C±50C)
Vaccum tightness		P≤5.0×10-3(Pa)
Iddle Shining Property Parameters		Y=220～260m2·0C/KW
Solar Irradiation for obtaining a preset water temperature	H≤4.7MJ/m2(∮=58mm)	H=4.1～4.4MJ/m2
	H≤3.7MJ/m2(∮=47mm)	H=3.1～3.4MJ/m2
Average Heat Loss Coefficiency		ULT=0.6～0.7W/(m2·0C)