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Warm Edge Technology IGUs

Warm-edge insulated glass units use an advanced non-metal spacer system to reduce heat loss at the glass perimeter, helping improve comfort, condensation resistance, and the long-term thermal performance of the sealed unit.

Warm EdgeCondensation ControlPremium Performance
Warm edge technology insulated glass units
Best suited to projects where edge-of-glass performance, occupant comfort, and improved insulation are key selection priorities.

Overview

Warm edge technology uses a flexible, non-metal spacer in place of a traditional conductive metal profile between the panes of an insulated unit. Because the edge of glass is often where the greatest thermal transfer occurs, reducing conduction in this area can make a meaningful difference to overall unit performance.

These systems are commonly selected for projects that aim to improve winter comfort near windows, reduce cold-edge effects, and minimise the risk of edge condensation in spaces with higher humidity or stronger energy-efficiency targets.

Key benefits

  • Reduces thermal bridging around the perimeter of the unit.
  • Helps increase inner-edge glass temperatures to limit condensation risk.
  • Supports improved thermal comfort and energy efficiency.
  • Accommodates expansion and contraction for strong long-term seal performance.
  • Can contribute to better acoustic outcomes in suitable insulated builds.

System Detail

Configuration and performance guidance

The spacer defines the cavity boundary and contributes to seal durability, thermal performance, and the edge behaviour of the unit. Warm-edge spacer systems are available in different widths and can be paired with multiple pane types to suit the thermal, acoustic, and safety demands of the project.

  • Available in different cavity sizes based on system and performance requirements.
  • Can be supplied with air-filled or gas-filled cavities where specified.
  • Suitable for clear, tinted, Low-E, laminated, and toughened combinations.
  • Can be custom sized for standard windows, large panels, and specialised glazing applications.
  • Well suited to projects where edge performance and comfort are part of the design brief.
Warm edge insulated glass unit example
Warm-edge configurations can be combined with clear, tinted, Low-E, laminated, and toughened glass depending on the required performance outcome.

Performance Data NHG

Reflex-Seal insulated glass units performance reference.

Review visible light, solar energy, and European standards values for the Reflex-Seal insulated glass unit range.

Reflex-Seal Insulated Glass Units

Product Visible Light Solar Energy European Standards
Transmission Reflection outside Reflection inside Direct Transmission Absorption Reflection outside Solar Factor (g)
EN 410		 Shading Coeff
Absorp-g DIN /		 U-value
EN 673 W/(m2-K)		 Solar heatgain Coeff
SHGC
Reflex-Seal Clear 85 8 8 75.2 16 8.8 76 0.88 2.8 76
Reflex-Seal Clear LE 78.1 14 13 61 26 13 73 0.84 2 73
Reflex-Seal Neutral 70 LE 67 12 12 46 47 7 53.1 0.62 1.9 53
Reflex-Seal Neutral 52 54.1 14.9 11 46.6 40.7 12.7 55.2 0.65 2.8 55
Reflex-Seal Silver 20 20.2 30.5 23.9 15.9 55.6 28.5 28.1 0.33 2.8 28

Project Support

Need a higher-performing IGU specification for your project?

We can help you decide whether a warm-edge spacer system is the right fit for your thermal, condensation, and comfort requirements.

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