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CET has extensive experience in offering a wide range of glasses to help meet a multitude of designs and specifications. Whether you operate in the Replacement, New Build or Commercial Window sectors, we will give you support in suggesting alternatives and solutions for you and your customers:
Advice on glass solutions for U values and Window Energy Ratings • Quick and informed response to enquiries • Advice on range of glasses available • Literature.
To download a copy of our min/max sizes (subject to glass type) click 
Or drop us an e-mail: |
Unit type |
U values by spacer thickness |
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8 |
10 |
12 |
14 |
16 |
18 |
20 |
|
4mm clear / 4mm clear |
3.1 |
3.0 |
2.9 |
2.8 |
2.7 |
2.7 |
2.8 |
4mm clear / 4mm argon gas |
2.9 |
2.8 |
2.7 |
2.6 |
2.6 |
2.6 |
2.6 |
4mm clear / 4mm hard coat glass |
2.3 |
2.1 |
1.9 |
1.8 |
1.7 |
1.7 |
1.7 |
4mm clear / 4mm hard coat argon gas |
2.0 |
1.8 |
1.6 |
1.5 |
1.5 |
1.5 |
1.6 |
4mm clear / 4mm soft coat |
2.1 |
1.8 |
1.6 |
1.5 |
1.4 |
1.4 |
1.4 |
4mm clear / 4mm soft coat argon gas |
1.7 |
1.5 |
1.3 |
1.2 |
1.2 |
1.2 |
1.2 |
Document L compliance: The table alongside lists various U-values for 4mm float glass. Where argon gas is stated, U-values are based on a 90% argon gas / 10% air ratio. All U-values are rounded to the nearest 0.1 W/m2K.
Product areas |
Market sectors |
