Skip to main content

Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 1 Measured values of the thermal expansion coefficients of different wood species according to previous studies

From: Thermal expansion of wood at different equilibrium moisture contents

Author Year Species αlon (10−6 K-1) αrad (10−6 K-1) αtan (10−6 K-1) αtrasv (10−6 K-1) MC
Villari 1868 Boxwood 2.6 / / 61.4 Dry
Villari 1868 Silver fir 3.7 / / 58.4 Dry
Villari 1868 Oak 4.9 / / 54.4 Dry
Villari 1868 Pine 5.4 / / 34.1 Dry
Hendershot 1924 White pine 3.65 / / 63.6 Dry
Hendershot 1924 White pine / / / 72.7 4% MC
Hendershot 1924 White pine 4.00 / / / 5% MC
Hendershot 1924 Basswood 5.46 / / 44.4 Dry
Hendershot 1924 Tulip poplar 5.95 / / 42.9 Dry
Hendershot 1924 Hard maple 4.22 / / 60.2 Dry
Hendershot 1924 White ash 11.00 / / 45.8 Dry
Weatherwax 1956 Sitka spruce 3.52 23.9 34.6 / Dry 0/50 °C
Weatherwax 1956 Sitka spruce 3.15 23.8 32.3 / Dry − 50/50 °C
Weatherwax 1956 White fir 3.90 21.7 31.6 / Dry 0/50 °C
Weatherwax 1956 White fir 3.34 21.8 32.6 / Dry − 50/50 °C
Weatherwax 1956 Douglas fir 3.52 27.1 45.0 / Dry 0/50 °C
Weatherwax 1956 Douglas fir 3.16 27.9 42.7   Dry − 50/50 °C
Kubler 1973 Redwood 6 21 28 / Dry 0/50 °C
Kubler 1973 Redwood 7 31 53 / 12% MC 0/50 °C
Kubler 1973 Redwood − 4 − 5 − 12 / MC > 60% 0/50 °C
Kubler 1973 Douglas fir 6 24 29 / Dry 0/50 °C
Kubler 1973 Douglas fir 10 38 38 / 12% MC 0/50 °C
Kubler 1973 Douglas fir 10 9 9 / MC > 60% 0/50 °C
Kubler 1973 Red oak 9 26 32 / Dry 0/50 °C
Kubler 1973 Red oak 8 44 70 / 12% MC 0/50 °C
Kubler 1973 Red oak 0.3 0 0 / MC > 60% 0/50 °C
Salmén 1990 Norway spruce / − 32 / / FSP T < 63 °C
Salmén 1990 Norway spruce / 6 / / FSP T > 63 °C
Pizzo 2002 Norway spruce < 2 / / 27.7 12% MC
Pizzo 2002 Iroko < 2 / / 31.9 12% MC
Wood handbook 2010 Norway spruce 3.1/4.5 23.56 32.06 27.81 Dry G0 = 422 kg m−3 calculated value
  1. αlon = coefficient of thermal expansion in longitudinal direction; αrad = in radial direction; αtan = in tangential direction; αtrasv = in generic transversal direction as reported by some authors, MC = moisture content. In the last column (MC) the thermal interval (e.g., 0/50 °C) means that the test was done between the two temperatures indicated
  2. A G0 of 422 kg m−3 corresponds to a density at standard environmental conditions of 450 kg m−3
  3. FPS fiber saturation point