BS EN ISO 18526‑3:2020 pdf download.Eye and face protection — Test methods Part 3: Physical and mechanical properties.
6.2 Field of view
6.2.1 Principle
This test is intended to demonstrate that the protector provides a minimum field of view for the wearer.
6.2.2 Apparatus
6.2.2.1 Headform, according to ISO 18526‑4.
6.2.2.2 Goniometric device, to determine the rotation of the headform (6.2.2.1) in the horizontal and vertical planes.
NOTE A type A or type B goniometer can be used for purely horizontal or purely vertical measurements, see References [2] and [3].
6.2.2.3 CW‑laser, emitting light in visible range, with beam diameter (2 ± 1) mm.
6.2.2.4 Detector, placed at the corneal vertex of the headform (6.2.2.1).
6.3 Area to be protected — Assessment from the frontal direction
6.3.1 Principle This test is intended to demonstrate that the protector satisfies the frontal protection requirement by showing that there is no direct path from the front to the area to be protected.
6.3.2 Apparatus
6.3.2.1 Headform, according to ISO 18526‑4.
6.3.2.2 Steel rod, 2 mm nominal diameter, (125 ± 25) mm long with a flat, untapered, end.
6.3.3 Procedure The test shall be carried out as follows: — Mount the test sample on the specified headform (6.3.2.1) in accordance with the information to be supplied by the manufacturer, if provided. — Mount the steel rod (6.3.2.2) horizontally and perpendicular to the line joining the corneal vertices. — Probe to the limits of the area to be protected specified in the applicable product requirement standard, attempting to touch the surface of the headform. — If the position of the test sample in front of the face of the headform is adjustable, carry out the assessment at the largest wearing distance for the specified headform.
6.3.4 Test report
Report whether or not the test sample prevents any portion of the end of the rod from touching the specified area to be protected on the headform.
6.4 Area to be protected — Assessment from the lateral direction
6.4.1 Principle
This test is intended to demonstrate that the protector satisfies the lateral protection requirement by showing that there is no direct path from the side to the area to be protected.
6.4.2 Apparatus
6.4.2.1 Headform, according to ISO 18526‑4.
6.4.2.2 Steel rod, 2 mm nominal diameter, (125 ± 25) mm long with a flat, untapered, end.
6.5? Retention? by? headbands? and? harnesses? (sit? and? fit)
6.5.1 Principle
This test is intended to demonstrate that the protector fits comfortably and securely throughout a number of physical movements.
6.5.2 Procedure
The test shall be carried out as follows:
— The test sample shall be donned by two different trained observers and adjusted appropriately.
— When wearing the test sample, undertake the following accelerated movements, starting from a standing position:
— turn head left and right;
— tilt head back and forward;
— standing jump on the spot five times.
6.5.3 Test report
Record any significant physical discomfort or insecurity of the fit of the test sample.
6.6 Visual assessment of material and surface quality of lenses
6.6.1 Principle
This test is intended to demonstrate that the material and surfaces of the lenses of a protector are free from visible defects.
6.6.2 Apparatus
A suitable apparatus is shown in Figure 1.BS EN ISO 18526‑3 pdf download.