BS EN 166:2002 pdf download – Personal eye-protection — Specifications
7.1.3 Quality of material and surface Except for a marginal area 5 mm wide, oculars shall be free from any significant defects likely to impair vision in use, such as bubbles, scratches, inclusions, dull spots, pitting, mould marks, scouring, grains, pocking, scaling and undulation. The assessment shall be carried out in accordance with the method specified in clause 5 of EN 1 67:2001 .
7.1.4 Robustness
7.1.4.1 Minimum robustness This requirement relates only to cover plates and oculars with filtering effect and need not be assessed if these items are intended to meet the requirements for increased robustness or resistance to high speed particles, in which case the requirements of 7.1 .4.2 or 7.2.2 shall be met. The requirement for minimum robustness is satisfied if the ocular withstands the application of a 22 mm nominal diameter steel ball with a force of (1 00 ± 2) N, when tested in accordance with clause 4 of EN 1 68:2001 .
On so testing the following defects shall not occur:
a) ocular fracture : an ocular shall be considered to have fractured if it cracks through its entire thickness into two or more pieces, or if more than 5 mg of the ocular material becomes detached from the surface away from the one in contact with the ball, or if the ball passes through the ocular;
b) ocular deformation : an ocular shall be considered to have been deformed if a mark appears on the white paper on the opposite side to the one on which the force is applied.
7.1.4.2 Increased robustness
7.1.4.2.1 Unmounted oculars The oculars shall withstand the impact of a 22 mm nominal diameter steel ball, of 43 g minimum mass, striking the ocular at a speed of approximately 5,1 m/s, when tested in accordance with 3.1 of EN 1 68:2001 . On so testing the following defects shall not occur:
a) ocular fracture : an ocular shall be considered to have fractured if it cracks through its entire thickness into two or more pieces, or if more than 5 mg of the ocular material becomes detached from the surface away from the one struck by the ball, or if the ball passes through the ocular;
b) ocular deformation : an ocular shall be considered to have been deformed if a mark appears on the white paper on the opposite side to that struck by the ball.
7.1.4.2.2 Complete eye-protectors and frames The complete eye-protector or frame shall withstand the lateral and frontal impacts of a steel ball striking at a specified speed. The diameter of the steel ball and the corresponding impact speed are given in Table 5.
The test shall be in accordance with the method specified in 3.2 of EN 1 68:2001 . If a spectacle is claimed to have lateral protection it shall not be possible for the ball to strike the lateral impact points without first striking the lateral protection. On so testing the following defects shall not occur:
a) ocular fracture : an ocular shall be considered to have fractured if it cracks through its entire thickness into two or more pieces, or if more than 5 mg of the ocular material becomes detached from the surface away from the one struck by the ball, or if the ball passes through the ocular;
b) ocular deformation : an ocular shall be considered to have been deformed if a mark appears on the white paper on the opposite side to that struck by the ball;
c) ocular housing or frame fracture : an ocular housing or frame shall be considered to have failed if it separates into two or more pieces, or if it is no longer capable of holding an ocular in position, or if an unbroken ocular detaches from the frame, or if the ball passes through the housing or frame;