Vacuum tube for solar water heater

Tube Specifications:

• Length: 70"
• Outer tube diameter: 2.2"
• Inner tube diameter: 2.1"
• Glass thickness: 0.1"
• Thermal Expansion: 3.3x10-6 OC
• Material: Bobsilicate Glass 3.3 &
• Absorbed layer material:?CU/SS-ALN
• Absorption: >93% (AM 1.5)
• Emittance: <8% (80 OC)
• Vacuum degree: P<5x10-3 PA??
• Stagnation Temperature: >220 Degrees C
• Heat Loss: < .7 W/(M20C)
• Maximum Strength: 1.0 MPA
• Compatible with most 1800 Max 58 mm evacuated tube systems