BS ISO 11561:1999
Current
The latest, up-to-date edition.
Ageing of thermal insulation materials. Determination of the long-term change in thermal resistance of closed-cell plastics (accelerated laboratory test methods)
Hardcopy , PDF
English
15-10-1999
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1 Scope
2 Normative references
3 Definitions
4 Test methods - General
5 Method A - Test to determine time-dependent change in thermal
properties of core materials
6 Method B - Simplified test to determine a design life-time
thermal resistance of an unfaced product
7 Precision
8 Test report
Annex A (informative) Analytical model
Annex B (informative) Example of the determination of long-term
resistance of faced products
Bibliography
Defines two laboratory test methods, based on scaling and slicing techniques, to determine the long-term changes in the thermal resistance of closed-cell (normally 90%) cellular plastic materials that contain gases which, through diffusion processes, affect the properties of a foam with time.
| Committee |
PRI/24
|
| DevelopmentNote |
Supersedes 96/121141 DC. (07/2005)
|
| DocumentType |
Standard
|
| Pages |
24
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This International Standard specifies two laboratory test methods, based on slicing and scaling techniques, to determine the long-term changes in the thermal resistance of closed-cell (normally 90%) cellular plastic materials that contain gases which, through diffusion processes, affect the properties of a foam with time.
Using standard methods for the measurement of thermal resistance, method A consists of periodic measurements performed over a short time interval on thin specimens conditioned in a controlled ambient temperature environment. The results of relative change with time are used in conjunction with a mathematical technique to derive the thermal resistance of greater thicknesses of the material as a function of time.
Method В describes a simple test to determine a conservative design life-time value (25years and longer) for an unfaced, closed-cell, cellular plastic product. This method is limited currently to unfaced homogeneous materials. For this method, multiple specimens of the core and surfaces of materials with variations in the slope of the primary stage thermal resistivity and a time relationship of less than 10%within a sample are considered to be homogeneous. Generally, products with natural skins or with density deviations normally found with such products may be considered acceptable for test by this technique.
| Standards | Relationship |
| ISO 11561:1999 | Identical |
| ISO 6946-1:1986 | Thermal insulation Calculation methods Part 1: Steady state thermal properties of building components and building elements |
| ISO 2896:2001 | Rigid cellular plastics Determination of water absorption |
| ISO 9346:2007 | Hygrothermal performance of buildings and building materials — Physical quantities for mass transfer — Vocabulary |
| ISO 4590:2016 | Rigid cellular plastics Determination of the volume percentage of open cells and of closed cells |
| ISO/TR 9165:1988 | Practical thermal properties of building materials and products |
| ISO 8302:1991 | Thermal insulation — Determination of steady-state thermal resistance and related properties — Guarded hot plate apparatus |
| ISO 8301:1991 | Thermal insulation — Determination of steady-state thermal resistance and related properties — Heat flow meter apparatus |
| ISO 7345:1987 | Thermal insulation Physical quantities and definitions |
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