01

Grab tensile — ASTM D4632

Measures the force to break a specimen gripped across part of its width. It is a proxy for how the fabric survives handling and placement.

02

Permittivity — ASTM D4491

The rate water passes through the fabric under a set head. Drainage designs depend on this number being at least what was assumed.

03

Apparent opening size — ASTM D4751

Indicates the largest particle that will effectively pass through. It is chosen against the gradation of the soil being retained.

04

Minimum average roll values

Project tables usually list minimum average roll values. That is a commitment about every roll delivered, which is why each roll is traced to its run.