1. Whole glass vacuum tubes adopt super hard borax and silica glass; 2. Absorb rate: ≥ 93%, thermal radiation rate: ≤ 6% 3. Temperature when exposed to sun without water: 250, 2.5hours to boiling if using single tube; 4. Resist 25mm hail, using life can last 20 years.
1. Whole glass vacuum tubes adopt super hard borax and silica glass; 2. Absorb rate: ≥ 93%, thermal radiation rate: ≤ 6% 3. Temperature when exposed to sun without water: 250, 2.5hours to boiling if using single tube; 4. Resist 25mm hail, using life can last 20 years.
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