This method describes a procedure for measuring the penetration of water through fabrics, with the fabric under constant water pressure. It is primarily applicable to heavily proofed fabrics used in tarparlins, tentage and vehicle covers. The test is carried out using a head of water considered to represent conditions in excess of those likely to be experienced in service.

This method may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this method has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use.