GB/T 19687-2005
Determination of the long-term change in thermal resistance of closed-cell plastics(accelerated laboratory test methods) (English Version)
- Standard No.
- GB/T 19687-2005
- Language
- Chinese, Available in English version
- Release Date
- 2005
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 19687-2005
- Scope
- This standard specifies two methods to determine the time-dependent thermal resistance of gas-filled closed-cell plastics (typically 90%) based on slices and size factors. Standard methods are used to test the thermal resistance value. Method A is a method for periodically testing the thermal resistance of a sheet specimen placed in a controlled temperature environment. This test method combined with numerical processing can deduce the functional relationship of the thermal resistance of large thickness materials as a function of time. Method B provides a test method for the thermal resistance of unfaced closed-cell plastics over the design life (25 years or more). This method is currently only applicable to homogeneous materials without veneers. For this method, a sample material can be considered homogeneous if the thermal resistance of the specimen in the initial thickness direction and the change in thermal resistance with time are less than 10% for the core and surface of the material. Typically samples with a natural skin or normal variation in density can be considered homogeneous materials.
GB/T 19687-2005 history
- 2005 GB/T 19687-2005 Determination of the long-term change in thermal resistance of closed-cell plastics(accelerated laboratory test methods)
