This International Standard specifies a pass/fail method for the determination of the resistance of rubber- or plastics-coated fabrics to water penetration (hydrostatic resistance) when subjected to a specific hydrostatic pressure over a fixed period of time. Two test specimen shapes are given: one is circular, the other square.
GSO ISO 1420:2015 history
2015GSO ISO 1420:2015 Rubber- or plastics-coated fabrics -- Determination of resistance to penetration by water