CSA Z94.3-2015 pdf free download

CSA Z94.3-2015 pdf free download.Eye and face protectors.
12.2.1.2
The headform shall be rigidly mounted on a solid base.
12.2.1.3
Propulsion equipment shall be capable of propelling either a 6.00 ± 0.05 mm diameter steel ball horizontally at a speed of 50,9 ± 0.5 rn/s or a 6.35 ± 0.05 mm diameter steel ball horizontally at a speed of 46.5 ± 0.5 rn/s. The steel balls used in this test shall have a hardness in the range of 56—67 RHC. The 6.00 mm steel ball shall have a mass of 0.92 ± 0.02 g. The 6.35 mm steel ball shall have a mass of 1.04 ± 0.02 g.
Note: This equipment consists essentially of a barrel or a tube of sufficient length to ensure a constant exit speed of the steel ball, together with a breech or loading mechanism positioning the steel ba/lot a fixed position from the barrel or tube end, and a spring or compressed gas to provide the means of propulsion. The length of tube or smooth barrel required is a function of the characteristics of the gas supply or spring used for propulsion and the fit of the boll in the tube. Therefore, each individual apparatus could have different characteristics, and it is not possible to specify precise requirements for the length of the barrel and the fit of the ball in the bore in this Standard.
12.2.1.4
The speed of the test ball shall be determined using timing equipment recording in units of 10 us or smaller The recommended method is to use an electronic timer with detectors of the inductance. capacitance, or lightsensltive type. The detectors shall be mounted near the projectile path between the muzzle end of the barrel and the lens under test. The recording of speeds shall be made no further than 250 mm from the point of impact.
Note: The accuracy of the timing units is dictated by the spacing between the sensing elements and the accuracy that is required for the ball-speed measurement. Present indications are that the spacing between the sensing elements should not exceed 150 mm and that, with this particular spacing and the highest speed envisaged, the accuracy of the timing unit should be as stated, in order to allow for variations on other points and still keep the overall speed within the limits specified.
12.2.2 Test methods
12.2.2.1 General
This test is carried out to assess the resistance to a single impact at any point on the components described in Clause 6.1.1. Thus, there shall be only one impact on a selected point, and no impact on a point where the likelihood of failure can have been significantly increased by a previous nearby impact (e.g., a spectacle lens that has been impacted at its centre shall not then be impacted at its edge). The target shall be positioned no more than 300 mm from the muzzle end of the propulsion device, and test balls shall be projected at the target points along a horizontal trajectory.CSA Z94.3-2015 pdf free download.