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  • BSI
    BS 6993-2:1990 Thermal and radiometric properties of glazing - Method for direct measurement of U-value (thermal transmittance)
    Edition: 1990
    $281.30
    / user per year

Description of BS 6993-2:1990 1990

This Part of BS 6993 describes a method for measuring the U-value (thermal transmittance) of the central area of single, double or multiple glazing using hot-box apparatus complying with BS 874-3.1. The edge effect, due to the thermal bridge through the spacer of double or multiple glazing, is effectively eliminated in this method.

The method is designed to measure the U-value of the glazing alone, i.e. the glass (or alternative glazing material) and any enclosed air space, and the additional information required in the test reports of clause 8 and A.9 of BS 874-3.1:1987.

Appendix A specifies values to be used in the calculation of a U-value in accordance with BS 6993-1, when such a calculated value is to be compared with that obtained by direct measurement in accordance with this Part of BS 6993.

Appendix A gives a worked example, which illustrates the use of this Part of BS 6993.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.



Method for measuring the transmittance of the central area of single, double or multiple glazing using hot box apparatus complying with BS 874-3.1. The edge effect due to the thermal bridge through the spacer of double or multiple glazing is effectively eliminated by this method.

Standard NumberBS 6993-2:1990
TitleThermal and radiometric properties of glazing - Method for direct measurement of U-value (thermal transmittance)
StatusConfirmed
Publication Date1990-07-31
DescriptorsTesting conditions, Windows, Control samples, Construction systems parts, Thermal measurement, Thermal transmittance, Test equipment, Glazing, Equations
ICS81.040.20 Glass in building
CommitteeB/540
ISBN0 580 17934 6
PublisherBSI
Pages14

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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