Insulation up to 200 mm thick (5 °C to 40 °C)

This heat flow meter is a commercial apparatus for thermal conductivity (or thermal resistance) of insulation materials and is calibrated against the UK national standard guarded hot-plate.

Specification

• Thermal conductivity range: up to 0.05 W/m·K
• Mean specimen temperature range: 5 °C to 40 °C
• Conforms to ISO 8301:1991, EN 12667:2001 and EN 12939:2000

Accreditation

• UKAS accredited test service (UKAS 0002)
• Accredited under 89/106/EEC: Construction Products, Notification id: 1146
• Registered laboratory in CEN Keymark Scheme for Thermal Insulation

Specimen dimensions

A single specimen is required.

• Thickness: 20 mm to 200 mm
  (The thickness is within 2% of its mean thickness over its whole area)
  Note: Thinner specimens can be measured, if it is the thickness that they will be supplied to the end user
• Length and breadth: 610 mm x 610 mm
  (Within range 605 mm to 611 mm)
• Flatness: The 610 mm square faces are flat to better than 0.2 mm
  (Flatness criteria do not apply to compressible or fibrous insulations)

Note 1

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.

Note 2

If you do not have a specific temperature at which you would like the measurements made, then we would suggest a mean specimen temperature of 10 °C, as this is most commonly used for certification and comparison of construction products.

Note 3

For compressible or fibrous insulations, the thickness will be initially measured according to EN 823:1995. This thickness value will then be used to determine the thickness imposed on the specimen during the test.

Contact

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