BS/EN 14458-2018 pdf download.Personal eye-equipment-High performance visors intended only for use with protective helmets.
5.2.14.3 Fitting and adjustment
Where parts of the visor and means of fixing are designed to be adjustable or replaceable, this shall be achievable by hand, without the aid of special tools. Test in accordance with and ,9.
5.2.14.4 PosItioning and operation
The visor shall be moveable between an in-use (protective) position or positions, and an out-of-use (standby) position. The visor shall park in the various positions, requiring a deliberate action on the part of the wearer to enable movement from one position to another. If the visor is able to park in intermediate non-tested positions, a warning shall be provided in the information supplied (see Clause 8 t)) that the stated levels of protection are only provided when the visor is fully in the in-use protective position(s).
Movement of the visor shall not cause contact of the viewing surface with any part of the helmet except for wiper strips or other parts deliberately intended to contact the viewing surface. This requirement shall also be met during assessment of the resistance of the equipment to extremes of temperature (5.2k).
No part of a face guard shall come into contact with the face of the wearer (or any designated corrective eyewear), in any position. Eye guards designed to fit closely may contact the wearer’s face along their lower edge when adjusted In accordance with the manufacturer’s instructions, but shall not contact the face (or any designated corrective eyewear) elsewhere. Test according to and ,9.
Use and positioning of the visor shall be achievable using both left and right hands, singly. For visors with increased thermal performance (see 3J, this action shall be achievable without difficulty while wearing gloves conforming to EN 659. EN 407 or EN 12477 as appropriate. Test in accordance with 9.
5.2.14.5 Ergonomic compatibility with other equipment
The visor shall integrate satisfactorily with the relevant following items, as defined by the visor manufacturer:
a) the designated helmet(s) with which it shall be used;
b) if claimed, any frame for corrective eyewear designated for use with the helmet/visor assembly;
c) if claimed, any other items designated to be worn simultaneously during use.
Test in accordance with and . The test report shall identify any specific items used during
these tests.
Only frames for corrective eyewear which have been shown to be compatible with the visor / helmet assembly should be used.
NOTE These two levels are representative of the range of practical use conditions. Selection of the appropriate level will need to follow a suitable and sufficient risk assessment by the user.
The temperature measured on the headform behind the face guard shall not increase by more than 25 °C above the initial sensor temperature during the 3 mm exposure.
5.3.2.2 Radiant heat resistance
One face guard shall be exposed according to in the in-use position, at the radiant heat flux used in 5.3.2.1. It shall satisfy the following requirements:
a) no part of the face guard shall melt, drip or ignite, nor come into contact with any part of the headform with which it was not In contact before the test;
b) there shall be no significant degradation (e.g. cracking, crazing or opacity) to the visor or its means of fixing for both test samples;
c) one visor shall be assessed for ability to read 4 characters (100 ± 1) mm high at a distance of (10 ± 0,05) m at an ambient lighting level of (500 ± 50) lx;
d) after the exposure, and allowing the face guard to cool to ambient temperature for (60 ± 5) mm, it shall continue to satisfy the requirements for protection against high-speed particles according to 5.2.10 or £. If claimed. assessed by one frontal Impact;
e) ft shall also continue to raise/lower correctly;
1) the exposed face guard shall not disturb the fit or function of corrective frames.
5.3.3 Flammability
When tested according to 6.7, following conditioning by storage for at least 72 h at (20 ± 2) °C and (65 ± 5) % relative humidity after cleaning 5 times in accordance with 5.2.4. and final application of any anti-fogging compound, if specified, no part of the face guard or means of fixing shall show:
a) any drip during the whole test;
b) visible flame or glowing combustion 5 s or more after removal from the test flame.
5.3.4 Resistance to molten metals and hot solids
Face guards and their means of fixing to the designated helmet(s) shall be tested:
a) In accordance with EN ISO 9185; the metal shall be aluminium, as specified in EN ISO 9185:2007, Annex A, with a mass of (100 ± 10) g, and the face guard shall not:BS/EN 14458-2018 pdf download.