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Ski goggles for downhill skiing - NF EN 174 (2001)

Compulsory tests and examinations :

Adjustment and adaptation (174-AJA1)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to check by visual inspection of the holding of ski goggles in use, and its adaptation to the shape of the face.

The sample is compliant if the surfaces in contact with the face are made in a flexible, soft material, and if the headband is elastic or adjustable and provides firm holding at the back of the head or helmet. The whole headband must resist all the stresses it is subjected to under normal use, without tearing or suffering permanent deformation.


Cleaning and care properties (174-ANE1)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to verify the manufacturer's indications as to the cleaning and care of ski goggles.

The ski goggles are compliant if all the eye protection elements resist cleaning (according to the methods recommended by the manufacturer).


Field of view (174-CV01)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to measure the part of space visible through a motorcycle spectacles-mask, calculating the total angle of the field of vision.

The interpretation of the results depends on the standard tested.


Diffusion of light - double screen (174-LD03)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to determine the reduced luminance factor of a framed or unframed solar protection filter on a double screen. This test characterises the light diffused by the illumination of the filter.

The samples are compliant if the value of the reduced luminance factor falls within the tolerances set out in the appropriate standards.


Diffusion of light- single screen (174-LD02)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to determine the reduced luminance factor of a framed or unframed solar protection filter on a single screen. This test characterises the light diffused by the illumination of the filter.

The samples are compliant if the value of the reduced luminance factor falls within the tolerances set out in the appropriate standards.


Marking and information control (174-MI04)

Accreditation # 1-1497 Scope available on www.cofrac.fr

The supplier or manufacturer must provide at least the following information, in the form of a marking on the sunglasses frame, an affixed label or packaging :

 


Prismatic power difference (174-DP01)

Accreditation # 1-1497 Scope available on www.cofrac.fr

The aim of this test is to assess the difference in the prismatic power of a frame by measuring the deviations, horizontal and vertical, of the rays crossing the eyepieces.

The interpretation of the results depends on the standard tested.


General requirements (174-EGE1)

Accreditation # 1-1497 Scope available on www.cofrac.fr

Ski goggles must be free of sharp edges or other defects likely to cause a lack of comfort or injuries during normal use. The check is made by visual inspection.


Transmittance and filter category (174-FT04)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to measure, at the reference point, the transmission factor of a filter (visible and UV), to determine its category and to check requirements relating to car driving and road users  (recognition of traffic lights).

There are 5 filter categories from the lightest (Cat S0) to the darkest (Cat S4). The UV transmission requirements differ in function of the category.


Homogeneity of the transmission factor of framed and separate eyepieces (174-HTMS)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to verify the variation in the relative value of the transmission factor in the visible of a single frame. Measurements are taken at the centre of vision between the right eyepiece and the left eyepiece.

The variation must not exceed 20% (related to the lightest filter).


Protection against water and snow (174-PG01)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to test the resistance of a spectacles-mask protector against droplets or against snow, by testing its impermeability.

The sample is compliant when its sealing requirement is adhered to.


Optical power of eyepieces (174-PO01)

Accreditation # 1-1497 Scope available on www.cofrac.fr

The aim of this test is to measure the values of the spherical, astigmatic and prismatic powers of lenses. The measurements are made at the reference point.

The interpretation of the results, with regard to optical power, depends on the standard tested.


Quality of material and surface (174-MS01)

Accreditation # 1-1497 Scope available on www.cofrac.fr

The aim of this test is to evidence all material and surface defects present on the eyepieces of personal eye protective equipment and ophthalmic eyepieces.

The observation zone is 30 mm around the reference point, it excludes a marginal zone of 5 mm from the edge of the lens. A large range of defects may be observed on the latter (e.g.: bubbles, embedding, scratches, cracks…).


Resistance to ignition (174-RI02)

Accreditation # 1-1497 Scope available on www.cofrac.fr

The aim of this test is to check the behaviour of eye protection equipment or of a pair of ophthalmic spectacles on the contact of an arm mounted at 650 °C.

The sample is compliant if it doesn’t catch fire, and if it does not continue to glow after the flame source has been removed.


UV ageing-double screen (174-RRU4)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us, according to the claimed double-screen filter category, to establish a relative variation of the transmission factor in the visible and of the reduced luminance coefficient, after 50 hours’ exposure to Ultra-Violet rays.

The sample is compliant when all the standard-specific requirements are satisfied.


UV ageing-single screen (174-RRU3)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us, according to the claimed single-screen filter category, to establish a relative variation of the transmission factor in the visible and of the reduced luminance coefficient, after 50 hours’ exposure to Ultra-Violet rays.

The sample is compliant when all the standard-specific requirements are satisfied.


Mechanical resistance (174-RM02)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to verify the resistance of eyepieces to an impact produced by a ball of a nominal diameter of 22 mm, with a minimum mass of 43g, at a specific point of the protector, at a speed of 5.1m/s. In order to conduct this test, it is necessary to condition the ski goggles at a temperature of -10°C for at least one hour, and the impact must be applied to new ski goggles within one hour of its removal from the freezer.

The sample is compliant when, on visual inspection, the frame or screen presents no fracturing or deformation.


Uniformity of luminous transmittance (174-HFT3)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to check the variation of the transmission factor in the visible (comparison between two measurements) and in the UVs of a single filter.

The largest of these two measurements being considered must not exceed by over 10% (20% for category 4), and the UV requirements must be adhered to.


Ventilation (174-VEN1)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to verify whether the inside of ski goggles is correctly ventilated during use.

The sample is compliant if the ventilation is adhered to, and if the air holes, which must be situated outside the eyepiece areas, do not significantly reduce peripheral vision.


Resistance to ignition (on ocular) (174-RI01)

Accreditation # 1-1497 Scope available on www.cofrac.fr

The aim of this test is to check the behaviour of eye protection equipment or of a pair of ophthalmic spectacles on the contact of an arm mounted at 650 °C.

The sample is compliant if it doesn’t catch fire, and if it does not continue to glow after the flame source has been removed.



Optional tests and examinations :

Claimed requirements of increased infrareds absorption (174-AIO1)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to verify that eyepieces that the manufacturer claims have an increased absorption of infrareds are compliant.

Samples are compliant when the maximum value of the solar infrared transmission factor is less than or equal to the transmission factor in the visible.


Special transmission requirement for photochromic filters (174-EPTP)

Accreditation # 1-1497 Scope available on www.cofrac.fr


Transmittance (clear T0/dark T1) and filter category for photochromic filters (174-FT13)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to measure, at a reference point, the transmission factor of a filter (visible and UV) to determine its category and check requirements relating to car driving and road users (recognition of traffic lights).

There are 5 filters categories from the lightest (cat 0) to the darkest (cat 4). The UV transmission requirements differ in function of the category.


Homogeneity of transmission for photochromic filters in the visible unmounted oculars (174-HFT5)

Accreditation # 1-1497 Scope available on www.cofrac.fr


Homogeneity of transmission for photochromic filters in the visible mounted oculars (174-HFT6)

Accreditation # 1-1497 Scope available on www.cofrac.fr


Resistance to misting (oculars) (174-RB02)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to test the resistance of personal eye protection equipment to misting. This specification is optional. The test is only conducted if the manufacturer or distributor claims that the product is misting resistant.

The samples are compliant if the misting time measured is above or equal to the requirements set out by the standard.


Resistance to surface deterioration by small particles (174-DFP2)

Accreditation # 1-1497 Scope available on www.cofrac.fr

This test enables us to test the resistance of eyepiece surfaces to the deteriorating action of small particles.

The results are interpreted differently according to the standard and the eyepiece’s optic class, using measurements carried out on the diffusion bench.


UV ageing (including transmission and diffusion after UV) for photochromic filters - Simple screen (174-RRU9)

Accreditation # 1-1497 Scope available on www.cofrac.fr


UV ageing (including transmission and diffusion after UV) for photochromic filters - Double screen (174-RRU10)

Accreditation # 1-1497 Scope available on www.cofrac.fr



A.LU.TEC laboratory
c/o Lycée Victor Bérard
35 quai Aimé Lamy - 39400 Morez - France
Tél. : +33 (0)3 84 33 61 51
Fax : +33 (0)3 84 33 35 13

Accreditation # 1-1497
Scope available on www.cofrac.fr

Only tests identified with symbol
are performed under accreditation covered.


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