Thermal resistance and thermal transmittance in the hot box

Measurement Thermal resistance R and thermal transmittance U
Standards DIN EN ISO 12567-1, DIN EN ISO 12567-2, DIN EN 12412-2, DIN EN 12412-4, DIN EN ISO 8990
Measurement object Windows (frame and glazing), profiles, skylights, doors, roller shutter casings, roof elements, façade elements, walls

Technical data

Test opening, test specimen dimensions
(W × H)
1230 × 1480 mm
1400 × 1600 mm
1100 × 1600 mm
1600 × 2000 mm
Small specimens From approx. 1.5 m², measurements can be conducted by means of masks made of insulating material
Larger specimens Measurement in the climate simulator


The test laboratory is recognized by the Deutsches Institut für Bautechnik (DIBt) as a testing facility under applicable building regulations LBO No. BWU10 and as a Notified Body No. 1004 to the terms of the Regulation of Construction Products (EU-BauPVO). It has been granted flexible accreditation under DIN EN ISO/IEC 17025 by the Deutsche Akkreditierungsstelle GmbH (DAkkS) under accreditation No. D‑PL‑11140‑11-04.