EN 174-2001 pdf download.Personal eye-protection-Ski goggles for downhill skiing.
Ski goggles shall sit reliably when used as intended and adapted to the contours of the face. The surfaces in contact with the face shall be made of soft flexible material. The head strap shall be designed to be flexible or adjustable and sit securely on the back of the head or the helmet. The head strap assembly shall withstand any stress which occurs during proper use without tearing or being permanently deformed. This is checked by visual inspection.
4.4 Ventilation
Design measures shall ensure that the inside of the ski goggles is well ventilated during skiing. This is checked by visual inspection.
NOTE The necessary rate of air exchange and the design of the ventilation openings depend heavily on the weather, style of skiing and the individual conditions (e.g. sweating), which means that generally applicable requirements cannot be stipulated.
5 Other requirements
5.1 OptIcal requirements
5.1.1 Field of vision
The size of the field of vision is defined in conjunction with the head-form as given in clause 17 of EN 168:2001.
Ski goggles shall exhibit a minimum field of vision defined by the two ellipses in Figure 1 when placed and centered at a distance of 25 mm from the surface of the eyes of the head-form. The horizontal axis shall be parallel to and 0,7 mm below the height of the line connecting the centres of the two eyes. The plane of the ellipses shall be parallel to the back flat portion of the head-form.
The horizontal length of the ellipses shall be of 32 mm, the vertical width of the ellipses shall be of 25 mm. The centre distance of the two ellipses shall be d = c+ 20 mm, where c is the pupillary distance. The pupillary distance is 64 mm. if not specified differently by the manufacturer.
If special transmittance properties are claimed, EN 1836:1 997 applies.
5.2 Mechanical strength
The ski goggle shall withstand the impact of a steel ball when tested in accordance with 6.5.
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 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 becomes detached from the frame, or if the ball passes through the housing or frame.
5.3 Protection against water and snow
The ski goggle shall be designed so that no snow or water can penetrate the ski goggle.
The result shall be considered to be satisfactory if no liquid enters the inside of the ski goggle during the test in accordance with clause 12 of EN 168:2001 when spraying from the front only in directions perpendicular to the flat portion at the back of the head-form.
5.4 Resistance to Ignition
Ski goggles shall be tested in accordance with the method specified in clause 7 of EN 168:2001 and shall be considered to be satisfactory if no part of the ski goggle ignites or continues to glow after removal of the steel rod.
5.5 Suitability for cleaning and care
All parts of the ski goggle shall be capable or withstanding, without visible change, cleaning in accordance with manufacturers recommended methods.
5.6.2 Resistance to fogging of oculars
If oculars are claimed to be resistant to fogging they shall remain free from fogging for a minimum of 30 s when tested in accordance with clause 16 of EN 168:2001.
NOTE Resistance to logging in use is a function of the antifog properties of the ocular and the design of the ski gogg’e.
5.6.3 Enhanced infrared absorption of oculars
It oculars are claimed to have enhanced infrared absorption, they shall comply with the requirements
of the last column of Table 2.
6 Testing
This clause contains recommended test methods. Any method shown to be equivalent may be used instead.
6.1 General remarks
The testing schedule in Table 3 shall be applied to type testing of complete ski goggles. The sequence of testing 1 to 10 may be changed. At least 9 samples are required for testing. If additionally testing for optional requirements has to be done, more than 13 samples may be necessary.EN 174-2001 pdf download.