BS EN ISO 18526-3:2020 pdf free.Eye and face protection一Test methods.Physical and mechanical properties.
BS EN ISO 18526-3 1 Scope This document specifies the reference test methods for determining the physical and mechanical properties of eye and face protectors. This document does not apply to any eye and face protection products for which the requirements standard(s) specifies other test methods. Other test methods can be used if shown to be equivalent and include uncertainties of measurement no greater than those required of the reference method. Mount the test sample on the headform in accordance with the fitting information supplied by the manufacturer. Set the goniometric device to indicate 0° in the horizontal and vertical directions, with its axes of rotation passing through the right corneal vertex position of the headform. The angular setting of the goniometer shall be made with an uncertainty of measurement not exceeding 1°. Direct the laser beam so that it passes through the corneal vertex position of the right eye of the headform, along the horizontal line perpendicular to the facial plane of the headform. NOTE Laser source and detector position are interchangeable. Rotate the headform to the left about the vertical axis to the position where the edge of the lens or the mounting prevents half of the laser beam from reaching the corneal vertex position. This is the temporal field of view. Record the angle to the nearest degree. Repeat by rotating the headform to the right to establish the nasal field of view. Return the headform to the 0° setting in the horizontal. Rotate the headform down to establish the superior field, and up for the inferior field. Repeat for the left eye. For a protector fitted with a single lens to cover both eyes, the field to the right should be measured as the temporal field for the right eye, the field to the left should be measured as the temporal field for the left eye; the superior and inferior fields may be measured for either eye.  BS EN ISO 18526-3 pdf download.