International Organization for Standardization (ISO)
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ISO 10293:1997
Scope
Gives a measuring method used to determine the U value (thermal transmittance) of multiple glazing with flat and parallel surfaces. Structured surfaces may be considered to be flat.
ISO 10293:1997 history
1997ISO 10293:1997 Glass in building - Determination of steady-state U values (thermal transmittance) of multiple glazing - Heat flow meter method