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Type	Tri-element	Normal (Blue)
Length	1500mm/1800mm	1500mm/1800mm
Outer Tube Diameter	47mm/58mm	47mm/58mm
Internal Tube Dia	37mm	37mm
Weight	1.4kg/2.0kg	1.4kg/2.0kg
Glass Thickness	1.6mm/2mm	1.6mm/2mm
Material	Borosilicate glass 3.3	Borosilicate glass 3.3
Absorptive Coating	Grade ALN/AIN-SS/CU	Grade ALN/AL
Vacuum degree	P≤5.0*10-3 Pa	P≤5.0*10-3 Pa
Thermal Expension	3.3*10-6/ºC	3.3*10-6/ºC
Insulation	>200ºC	>200ºC
Absorptance	>95%	>93%
Emittance	4-6%	5-7.5%
Heat loss	0.4-0.6W/(m2 ºC)	0.6-0.8W/(m2 ºC)
Maximum strength	0.8Mpa	0.8Mpa
Resist cold	-35ºC	-35ºC
Resist hailstone	Φ25mm	Φ25mm
Resist wind	30m/s	30m/s

Low Price Solar Evacuated Glass Tube For Sale

1). The marerial of glass tube: Hard borosilicate: 3.3

2). The thickness of inner and outer tube of: 1.6mm
3). Absorption coefficient: 93%
4). Absorptive coating: High efficient heat absorptive selective sputtering coating:
SS-C/CU&AL-N/AL
5). Emission coefficient: 10%(8%)
6). Evacuated: 5*10-3PA
7). Stagnation temperature: 220 degree celsius
8). Hail resistance: 25m
9). Vacuum tube freezing resistance: -35degree celsius