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Go Beyond ENERGY STAR®.
Achieve triple-glazed performance in a double-glazed window.

Download U4 Brochure





Surface 1
Surface 2
Surface 3
Surface 4
Gas-Argon

Exceed expectations - and ENERGY STAR ® standards

Adding U4 - 4th Surface Technology to your insulating glass windows is a true game-changer. You can improve your total window U-value performance by 0.04 or more, without changing your manufacturing processes. Now, you’ll be able to exceed the new ENERGY STAR standards and still maintain your competitive edge. It's all part of AGC's commitment to developing innovations that keep you ahead of the curve.

Feature Benefit Result
Hard Pyrolytic Coating
  • Easy to fabricate, handle and store
  • No edge deletion required
  • Unlimited shelf life
  • Easy transition on plant floor
  • No additonal training required
  • Improved inventory management
Neutral Color Allows for a clear view More light in - less heat out
No Special Handling Required Fits seamlessly into your production line
  • Improved window performance by 0.04 or more
  • No change to productivity
Lower Emmisivity >15% improvement of U-value
  • A better performing window
  • Meet ENERGY STAR in a dual glazed unit

Offer homeowners more with windows made with U4

U4 - 4th Surface Technology reduces heating costs, reduces energy use, and reduces your impact on the environment.

Standard IGU Configurations with One Low-E Coating U4 Configurations

Comfort Select 73 #4 = U4
U4 Performance Advantage
IGU Configuration COG U-factor CS #2 | CS 73 #4 = U4 COG U-factor COG U-factor Difference Performance Improvement
Clear | CS 73 #3 0.29 CS 73 | CS 73 #4 = U4 0.23 0.06 20.7%
Clear | CS 63 #3 0.26 CS 63 | CS 73 #4 = U4 0.21 0.05 19.2%
CS 40 #2 | Clear 0.25 CS 40 | CS 73 #4 = U4 0.20 0.05 20.0%
CS 36 #2 | Clear 0.25 CS 36 | CS 73 #4 =  U4 0.20 0.05 20.0%
CS 28 #2 | Clear 0.24 CS 28 | CS 73 #4 = U4 0.20 0.04 16.7%
CS R42 #2 | Clear 0.25 CS R42 | CS 73 #4 = U4 0.20 0.05 20.0%

 


Achieve triple-glazed performance in a double-glazed window.

Manufacturing triple-glazed windows is one way to meet increased ENERGY STAR® standards for thermal performance. However, capital investment and costly new production processes can cause you to lose your competitive edge. These issues are eliminated with U4 Technology.

The technology is baked in.

The innovative coating that gives U4 its outstanding performance is applied to the glass while it’s still in a molten state (approximately 600° C). As the glass cools, the coating and the glass become one single, high-performance, hard-coated glazing.
  • Unlimited shelf life
  • Requires no edge deletion, minimizing labor
  • Easy to cut; no special tools required
  • No special cleaning requirements, automated washers can be used
  • Annealed, but can easily be tempered or heat-strengthened
  • Comes with a 10-year warranty against cracking, chipping, peeling, flaking, and deterioration