Insulation up to 60 mm thickness (-170 °C to 50 °C)

This guarded hot-plate is an NPL designed and built national standard for thermal conductivity (or thermal resistance) of insulation at low temperatures.

Specification

• Thermal conductivity range: up to 0.15 W/m·K
• Mean specimen temperature range: -170 °C to 50 °C
• Conforms to ISO 8302:1991 and EN 12667:2001

Accreditation

• UKAS accredited test service (UKAS 0002)
• Accredited under 89/106/EEC: Construction Products, Notification id: 1146

Specimens dimensions

An identical pair is required.

• Thickness: 25 mm to 50 mm.
  (The thickness of each specimen is within 2% of its mean thickness over its whole area and that the mean thickness of each specimen is within 2% of the other)
  Note: Thinner specimens can be measured, if it is the thickness that they will be supplied to the end user
• Length and breadth: 305 mm x 305 mm.
  (Within range 302 mm to 315 mm)
• Flatness: The 305 mm square faces are flat to better than 0.2 mm.
  (Flatness criteria do not apply to compressible or fibrous insulations)

Note

Although 'thermal conductivity' is a property of a homogeneous material, it is generally accepted that the term can still be used for insulation/construction products that contain a continuous mixture of two or more materials (e.g. air and glass fibre or air and concrete) providing the size of any particles is less than a tenth of the specimen thickness. However, if your samples have either discrete layers or large particles, then 'thermal resistance' would be quoted on the Test Report, rather than 'thermal conductivity'. However, the thickness of the product during the test would be quoted in the Test Report, allowing an 'effective' thermal conductivity to be calculated by dividing the thickness (in metres) by the thermal resistance.

Contact

Customer Services tel: +44 20 8943 6245
E-mail: thermal_enquiries@npl.co.uk