BS 4745 Determination of Thermal Resistance of Textiles - Two Plate Method: Constant Pressure Procedure, Two Plate Plate Method: Fixed Opening Procedure and Single Plate Method

Material Testing

BS 4745 Determination of Thermal Resistance of Textiles - Two Plate Method: Constant Pressure Procedure, Two Plate Plate Method: Fixed Opening Procedure and Single Plate Method

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of BS 4745 testing. This section of BS 4745 specifies three methods for determining the resistance of fabrics, assemblies, or fiber bundles in the steady state to heat conduction through them at steady state. It is valid for materials with a thermal resistance up to approx. 0,2 M² K/W.

BS 4745 Determination of Thermal Resistance of Textiles - Two Plate Method: Constant Pressure Procedure, Two Plate Plate Method: Fixed Opening Procedure and Single Plate Method

These methods are suitable for materials up to 20 mm thick (over this thickness edge losses become noticeable). Recommendations on suitable components for making the apparatus are given, and methods for calculating thermal conductivity are described.

Three methods are described:

  • Two-plate method: constant pressure procedure;
  • Two-plate method: fixed opening procedure;
  • Single plate method.

Any of the two-plate methods is suitable for materials whose exterior is protected from ambient air during use, for example a blanket when covered with a bedspread.

The single plate method is suitable for materials whose outer surfaces are exposed to ambient air during use. Two-plate methods are generally preferred for accuracy and reproducibility.

A material whose thermal resistance is known and the temperature drop across a sample of the material being tested in series with it is measured and the thermal resistance of the sample is determined from the values ​​obtained.

EUROLAB assists manufacturers with BS 4745 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.

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