BS EN 12939:2001
Current
The latest, up-to-date edition.
Thermal performance of building materials and products. Determination of thermal resistance by means of guarded hot plate and heat flow meter methods. Thick products of high and medium thermal resistance
Hardcopy , PDF
English
20-12-2002
Foreword
Introduction
1 Scope
2 Normative references
3 Definitions, symbols and units
4 Instrumentation
5 Procedures
6 Calculations and test report
Annex A (normative) Instrumentation
Annex B (normative) Conversion utilities
for thick specimens
Annex C (informative) Advanced procedures
to test thick specimens exceeding thickness
capabilities of the apparatus
Annex D (informative) Items which are
expected to be specified in product standards
This standard particularly addresses towards specific problems related with testing according to European product standards, thick high and medium thermal resistance specimens with heat flow meter or guarded hot plate. The guarded hot plate and heat flow meter apparatus can be operated up to thickness of 100 mm to 150 mm and the accuracy has to be kept within 2%.
| Committee |
B/540
|
| DevelopmentNote |
Together with BS EN 12667 and BS EN 12664 Supersedes BS 874-2.1(1986) and BS 874-2.1(1988). (03/2001) Supersedes 97/711642 DC (01/2003)
|
| DocumentType |
Standard
|
| Pages |
36
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This standard gives the procedures to determine the thermal resistance of products the thicknesses of which exceed the maximum thickness for guarded hot plate or heat flow meter apparatus. In any case most of the procedures described in this standard require apparatus that allows tests on specimens up to 100 mm thick. This standard gives guidelines to assess the relevance of the thickness effect, i.e. to establish whether the thermal resistance of a thick product can or cannot be calculated as the sum of the thermal resistances of slices cut from the product, these guidelines complement the indications given in ISO 8302:1991 on the guarded hot plate apparatus.This standard describes testing conditions which prevent the onset of convection. which could take place in some products under the considered temperature differences and thicknesses.
| Standards | Relationship |
| NBN EN 12939 : 2001 | Identical |
| EN 12939:2000 | Identical |
| NS EN 12939 : 1ED 2000 | Identical |
| NF EN 12939 : 2001 | Identical |
| DIN EN 12939:2001-02 | Identical |
| NEN EN 12939 : 2000 | Identical |
| I.S. EN 12939:2000 | Identical |
| UNE-EN 12939:2001 | Identical |
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