Determining the optimal gas fill ratio for Insulating Glass Units (IGUs) involves considering several factors, including the specific insulating gas used, the desired thermal performance, and cost considerations. The most common gases used in IGUs are argon, krypton, and xenon, each with different thermal conductivity properties.
Thermal Performance and Cost-effectiveness
The optimal gas fill ratio often depends on achieving a balance between enhanced thermal performance and cost-effectiveness. Generally, argon is the most cost-effective option and is widely used in IGUs. For those aiming for higher thermal performance, krypton and xenon can be considered, but they come with higher costs.
While there is no one-size-fits-all answer to the optimal gas fill ratio, but our suggestion is that the gas concentration level should be over 85 %.
Standards in Insulating Gas Measurement
Also, industry standards and guidelines, like the International Organization for Standardization (ISO) and the American Society for Testing and Materials (ASTM), provide valuable insights for gas fill ratio for IGUs. Additionally, compliance with regional regulations and energy efficiency certifications, such as those from the National Fenestration Rating Council (NFRC) in the United States or the European Standard EN 1279-3, should be taken into account.