1)all glass hard borosilicate :3.3 2)high efficient selective absorption coating: SS-C/CU and AL/N

borosilicate glass vacuum tube specifications being described as  follows:

1)all glass hard borosilicate:3.3

2)high efficient selective absorption coating: SS-C/CU &AL/N

3)size of vacuum tube:47mm*1500mm  and 58mm*1800mm and 70mm*2100mm

4)sorted types: borosilicate glass vacuum tube with single target,borosilicate glass vacuum tube with three target, and golden purple vacuum tube and heat pipe vacuum tube and so  on.

the concrete specification as follows:

Model:AJ47/1500 AJ58/1800 AJ70/2100

Specification:

1)      Glass material: Borosillicate glass 3.3

2)      Glass thickness:1.6mm

3)      Absorption coefficient more than90%(92%)

4)      Aborbtive coating:SS-C/CU &AL/N)     

5) Emission coefficient :less10%(8%)

6)      Vacuum:less than 5*10-3 Pa

7)      Stagnation temperature: mor than220 Celsius

8)      Hail resistance:25mm

9)      Freezing resistance:-35 Celsius

Structure		Dual concentric geometry tube
Material of glass		hard borosilicate:3.3
Diameter and thickness of outer tube		Ø58±0.5mm&1.6mm
Diameter and thickness of inner tube		Ø47±0.5mm&1.6mm
Length of vacuum tube		1800mm(±mm)
Properties of absorptive coating	Coating method	selective absorptive sputtering coating: SS-C/cu & AL/N
	Transmissivity t≥ 0.89(AM1.5)	0.913
	Absorptance α≥ 0.86(AM1.5)	0.930
	Emissivity  εh≤0.080(30degree±5degree)	0.026
Pressure of vacuum tube   p≤5×10-2 Pa		5×10-3Pa
Stagnation parameter Y>250sqm·degree/kW		246.3
Solar radiance   H<4.7MJ/sqm		4.59
Average heat loss coefficient: ULT<0.8W(sqm·degree)		0.721
Lifetime		15 years

borosilicate glass vacuum tube