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Official Journal of the Japan Wood Research Society

Table 2 Surface tension and its polar and disperse part of liquids to determine the wetting properties of surfaces according to DIN 55660-2 [21]

From: Modifying elastic modulus of two-component polyurethane adhesive for structural hardwood bonding

Chemicals

Surface tension

\(\sigma_{\text{l}}\)

(mN/m)

Disperse part

\(\sigma_{\text{l}}^{\text{d}}\)

(mN/m)

Polar part

\(\sigma_{\text{l}}^{\text{p}}\)

(mN/m)

Purity (%)

Distilled water

72.8

21.8

51.0

Diiodomethane

50.8

50.8

0.0

99.9

Ethylene glycol

47.7

30.9

16.8

99.5

Glycerin

64.0

34.0

30.0

98.0