ONORM EN 673 : 2011

Foreword
1 Scope
2 Normative references
3 Symbols
4 Definitions
5 Basic formulae
6 Basic material properties
7 External and internal heat transfer coefficients
8 Declared values: standardized boundary conditions
9 Expression of the results
10 Test report
Annex A (normative) Determination of normal and
         corrected emissivity
Annex B (normative) Iteration procedure for glazing
         with more than one gas space
Annex C (informative) Bibliography

Specifies a calculation method to determine the thermal transmittance of glazing with flat and parallel surfaces. Applicable to uncoated glass (including glass with structured surfaces, e.g. patterned glass), coated glass and materials not transparent in the far infrared, which is the case for soda lime silicate glass products (called hereafter soda lime glass), borosilicate glass and glass ceramic. Also applicable to multiple glazing comprising such glasses and/or materials.