From: Mechanical properties and moisture-related dimensional change of canvas paintings–canvas and glue sizing
Weave direction
Average E ± std. dev
30% RH
50% RH
75% RH
90% RH
weft
470 ± 160
550 ± 240
430 ± 220
120 ± 20
warp
200 ± 120
160 ± 86
110 ± 64
30 ± 19
bias
180 ± 64
180 ± 80
110 ± 77
13 ± 22