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ISO 9961:1992 Draughting media for technical drawings -- Natural tracing paper
standard by International Organization for Standardization, 06/01/1992
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Full Description
Specifies the minimum requirements, details qualities necessary for draughting and reproduction, and specifies appropriate test methods for the most commonly used grammages. Annex A describes measurement of transparency using the reflectance method, Annex B describes determination of tear growth resistance.