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Background Principles 1 Fabric wear is constant VOLUME loss not a constant caliper loss process. 2 Every fabric revolution, roughly the same volume of yarn is removed, not a constant thickness 4 Fabric is considered worn out when either: a) MD yarn has lost 50% of its thickness b) CD yarn has lost 90% of its thickness a) Single warp system - 50% warp thickness loss b) Stacked warps - 100% warp thickness loss