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Heritage Science

Table 2 Average swelling and shrinkage values of materials C, P and B after humidification and drying

From: The interaction of water with archaeological and ethnographic birch bark and its effects on swelling, shrinkage and deformations

Sample

Value

% Swelling

% Shrinkage

Tangential

Longitudinal

Radial

Tangential

Longitudinal

Radial

C

av

0.2

1.4

2.2

0.3

2.1

4.8

SD

0.1

0.8

0.6

0.2

0.9

1.0

P

av

2.2

1.8

–

0.8

0.7

–

SD

0.7

0.4

–

0.2

0.4

–

B

av

–

–

–

1.9

3.4

15.4

SD

–

–

–

1.3

0.2

3.5

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