Thermal conductivity of polyurethane insulation boards subjected to temporary compression

Zbigniew Respondek; Kacper Woźny

doi:10.17512/bozpe.2026.15.07

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Thermal conductivity of polyurethane insulation boards subjected to temporary compression

Construction of Optimized Energy Potential

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By: Zbigniew Respondek and Kacper Woźny

Open Access

|Jul 2026

Figures & Tables

Insulation under the foundation slab in the model (Izodom 2000 Polska Sp. z o.o., Zduńska Wola) single-family house (photo: Zbigniew Respondek)

General view: a) Heat Flow Meter Netzsch HFM 446, b) sample PIR, c) sample PUR (own photos)

Example graph generated by the device (own research)

XPS sample seasoning under load (own photo)

Measurement results of the XPS sample thickness (own research)

Description	Sample thickness
Description	d_0(in) [cm]	d_0(fi) [cm]	Diff [%]	d_30(in) [cm]	d_30(fi) [cm]	Diff [%]
Test 1	10.1493	10.1308	−0.18	10.1430	10.1258	−0.17
Test 2	10.1469	10.1267	−0.20	10.1427	10.1216	−0.21
Test 3	10.1453	10.1312	−0.14	10.1437	10.1267	−0.17
Average of Diff	−0.17 %			−0.18 %

Measurement results of the λ-value for the PIR sample (own research)

Description	Thermal conductivity
Description	λ₀ [W/(m·K)]	λ₃₀ [W/(m·K)]
Test 1	0.02080	0.02100
Test 2	0.02073	0.02115
Test 3	0.02104	0.02111
Average of measurements	0.02086	0.02109
Declared by the manufacturer	0.22

Measurement results of the λ-value for the PUR sample (own research)

Description	Thermal conductivity
Description	λ₀ [W/(m·K)]	λ₃₀ [W/(m·K)]
Test 1	0.02114	0.02130
Test 2	0.02073	0.02118
Test 3	0.02109	0.02135
Average of measurements	0.02109	0.02128
Declared by the manufacturer	0.21

Measurement results of the PIR sample thickness (own research)

Description	Sample thickness
Description	d_0(in) [cm]	d_0(fi) [cm]	Diff [%]	d_30(in) [cm]	d_30(fi) [cm]	Diff [%]
Test 1	10.0530	10.0204	−0.32	10.0642	10.0460	−0.18
Test 2	10.0602	10.0358	−0.24	10.0691	10.0565	−0.13
Test 3	10.0644	10.0389	−0.25	10.0677	10.0463	−0.21
Average of Diff	−0.27 %			−0.17 %

Measurement results of the λ-value for the XPS sample (own research)

Description	Thermal conductivity
Description	λ₀ [W/(m·K)]	λ₃₀ [W/(m·K)]
Test 1	0.03022	0.03122
Test 2	0.03067	0.03112
Test 3	0.03052	0.03125
Average of measurements	0.03047	0.03120
Declared by the manufacturer	0.35

Measurement results of the PUR sample thickness (own research)

Description	Sample thickness
Description	d_0(in) [cm]	d_0(fi) [cm]	Diff [%]	d_30(in) [cm]	d_30(fi) [cm]	Diff [%]
Test 1	10.1710	10.1633	−0.08	10.1645	10.1533	–0.11
Test 2	10.1695	10.1516	−0.18	10.1658	10.1543	–0.11
Test 3	10.1680	10.1594	−0.08	10.1664	10.1553	–0.11
Average of Diff	−0.11 %			−0.11 %

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Articles in this issue

DOI: https://doi.org/10.17512/bozpe.2026.15.07 | Journal eISSN: 2544-963X | Journal ISSN: 2299-8535

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Language: English

Published on: Jul 13, 2026

Published by: Technical University in Czestochowa

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

thermal conductivity,

polyurethane products,

ground-based floor,

lambda meter

Related subjects:

Architecture and design,

Architecture and design, other,

Engineering,

Civil engineering,

Materials,

Environmental engineering

© 2026 Zbigniew Respondek, Kacper Woźny, published by Technical University in Czestochowa
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License.

AHEAD OF PRINT

Thermal conductivity of polyurethane insulation boards subjected to temporary compression

Figures & Tables

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Measurement results of the XPS sample thickness (own research)

Measurement results of the λ-value for the PIR sample (own research)

Measurement results of the λ-value for the PUR sample (own research)

Measurement results of the PIR sample thickness (own research)

Measurement results of the λ-value for the XPS sample (own research)

Measurement results of the PUR sample thickness (own research)

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