Standard Test Method for Resistance of Medical Face Masks to Penetration by Synthetic Blood (Horizontal Projection of Fixed Volume at a Known Velocity) subscription-only What is BS EN 4641-200

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This document specifies requirements and test methods for divers’ watches and for saturation divers’ watches for use in deep diving (see Annex A which deals with watches for saturation diving)

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BS ISO 13653:2019 specifies graphs and formulas which are given to show the degree to which parabolic and spherical reflectors depart from the usual paraxial irradiance formulas when an extended source or a small source is placed near the aperture

Standard Test Method for Resistance of Medical Face Masks to Penetration by Synthetic Blood (Horizontal Projection of Fixed Volume at a Known Velocity) subscription-only What is BS EN 4641-2001. Scope 1. 1 This test method is used to evaluate the resistance of medical face masks to penetration by the impact of a small volume (~2 mL) of a high velocity stream of synthetic blood. Medical face mask pass fail determinations are based on visual detection of synthetic blood penetration.