A high-performance triple-glazed unit (TGU) requires two panes of Low-E glass, typically arranged as:
✅ 4mm clear glass / 4mm Low-E / 4mm Low-E
✅ Middle Low-E pane is recommended to be toughened to prevent thermal stress cracking
Example Triple Glazed Units:
| Glass Make-Up | U-Value (W/m²K) | Thickness |
| 4mm clear / 8mm Argon / 4mm clear / 8mm Argon / 4mm Planitherm Total+ | 1.3 | 28mm |
| 4mm clear / 8mm Argon / 4mm Planitherm Total+ / 8mm Argon / 4mm Planitherm Total+ | 1.0 | 28mm |
| 4mm clear / 10mm Argon / 4mm Planitherm One / 10mm Argon / 4mm Planitherm One | 0.8 | 32mm |
| 4mm clear / 12mm Argon / 4mm Planitherm Total+ / 12mm Argon / 4mm Planitherm Total+ | 0.8 | 36mm |
| 4mm clear / 12mm Argon / 4mm Planitherm One / 12mm Argon / 4mm Planitherm One | 0.7 | 36mm |
(Argon gas concentration at 90% for optimal thermal efficiency.)
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