polyethylene glycol MW 1500

wt%		log P (dynes/cm^2)

5.0		5.92
10.0		6.49
15.0		6.78
20.0		6.89
25.0		7.27
30.0		7.41
35.0		7.38
40.0		7.60
45.0		7.63
50.0		7.83
60.0		8.03
5.0		6.18
10.0		6.52
15.0		6.76
20.0		6.97
25.0		7.18
30.0		7.36
35.0		7.53

An equation that fits this data is the following.

log P = a + b * (wt%) ^ c

where a = 3.72, b = 1.57 and c = 0.24

Note that it should be applied only over the range of pressures measured.