BS 1938:2010 pdf download – Personal eye protection — Goggles for motorcycle and moped users
188.8.131.52 Special transmittance requirements and claimed transmittance properties If the oculars have special transmittance requirements and/or the claimed transmittance properties described in 4.1.3 and
4.1.4 of EN 1836:2005+A1:2007 then the oculars shall satisfy the requirements described in each corresponding clause of EN 1836:2005+A1:2007. All oculars shall have a luminous transmittance value greater than or equal to 18 %. 184.108.40.206 Requirements for road driving 220.127.116.11.1 Recognition of signal lights The goggles shall satisfy the requirement of the recognition of signal lights according to 18.104.22.168.3 of EN 1836:2005+A1:2007. 22.214.171.124.2 Spectral transmittance The goggles shall satisfy the requirement of the spectral transmittance according to 126.96.36.199.2 of EN 1836:2005+A1:2007.
4.7 Non optical requirements
4.7.1 General The requirements apply to goggles with all the oculars declared by the manufacturer. If the only difference between oculars is the colour, the compliance can be verified only on one type.
4.7.2 Impact resistance The requirement is satisfied if the goggles withstand the impact of a steel ball, when tested in accordance with 5.8.
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 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.
4.7.3 Resistance to surface damage by fine particles After the test described in 5.9 is made on the external face, the goggle’s oculars shall have a reduced luminance coefficient of not more than 10 cd/m²/lx.
4.8 Optional requirements – Resistance to fogging If resistance to fogging is claimed, then the oculars of the goggles shall remain free from fogging for a minimum of 30 s when tested in accordance with 5.10.
5.1 General The testing schedule in Table 3 shall be applied to type testing of complete goggles for motorcycle and moped users. The sequence of testing 1 to 9 may be changed. At least 16 samples are required for testing. If additionally testing for optional requirements has to be done, more than 16 samples may be necessary. All the samples shall pass the test.
5.2 Conditioning and test conditions Immediately before starting the test series, the test specimen shall be conditioned for at least 4 h in an atmosphere maintained at a temperature of (23 ± 5) °C and a relative humidity of (50 ± 20) %. Actual testing shall be carried out within 1 h after removal from the conditioning cabinet in an atmosphere maintained within the same temperature band.
5.3 Field of vision The size of the field of vision shall be measured with a perimeter in conjunction with the medium size head- form as defined in Clause 17 of EN 168:2001. The size of the field of vision of goggles for children shall be measured with a perimeter in conjunction with the small size head-form of EN 168:2001. The goggle shall be mounted as shown in Figure 2 so that the two axes of rotation A and B and the optical axis C intersect in the front surface of one eye at the interpupillary distance. Radiation is provided by a laser beam of (1 ± 0,5) mm diameter along axis C.