ISO 5636-4:1986

Paper and board — Determination of air permeance (medium range) — Part 4: Sheffield method

Specfies detailed requirements and operating procedures applicable to specific types of apparatus, and is applicable to papers and boards having air permeances between 0,02 and 25 m/(Pa.s), being unsuitable for rough-surface papers such as creped and corrugared papers, which cannot be securely clamped to avoid leakage.