Table 4 Supporting materials and their mechanical parameters.

From: Multifactor analysis and dominant factor identification for coal seam gas drainage borehole instability

Support material

Elastic modulus (GPa)

Poisson 's ratio

Polyvinyl chloride (PVC)

0.7

0.3

Polyethylene (PE)

1.5

0.3

Polypropylene (PP)

3.0

0.3

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