Specifications

VACUUM TUBE
lor steel and stainless steel
2.iso,ce,ccc,keymark
3.low price,good quality,quick delivery

Technical parameters
Tube	Standard Tube (Normal tubes)		Tri-tuble (Three high tube)
Specification	Model 47*15	Model 58*18	Model 47*15	Model 58*18
Length	1500mm	1800mm	1800mm	1800mm
Outer tube diameter	47mm	58mm	47mm	58mm
Inner tube diameter	37mm	47mm	37mm	47mm
Glass thicknes (Inner Tube)	1.6mm
Glass thicknes (outer Tube)	1.8mm
Glass material	Borosilicate Glass 3.3
Coating material	Al-A-Al	Al-A-Al	ALN-SS-Cu	ALN-SS-Cu
Coating position	Outer surface of inner tube
Absorption ratio	≥91%	≥91%	≥94%	≥94%
Reflection ratio	≤7%	≤7%	≤6%	≤6%
Vacuum degree	3.0T2-3Pa	3.0T2-3Pa	8.0T2-4Pa	8.0T2-4Pa
Thermal expansion coefficient	3.3*10-6/0C
Stagnation parameter	220m2 °C/KW
Average heat loss coefficient	0.75w/(m2.°C)	0.73w/(m2.°C)	0.67w/(m2.°C)	0.62w/(m2.°C)
Maximum pressure	0.6MPa
Minimum endurable temperature	–35°C	–35°C	–40°C	–40°C
Hailstone endurable (diameter)	Less than D25mm
Maximum endurable temperature	270°C	270°C	300°C	300°C