polyethylene glycol MW 6000

wt%		log P (dynes/cm^2)

10.0		6.23
15.0		6.51
20.0		6.79
25.0		7.02
30.0		7.23
35.0		7.43

An equation that fits this data is the following.

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

where a = 5.12, b = 0.28 and c = 0.59

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