Analysis of Differences in Sunglasses Testing Standards between Europe, America, etc. and my country

by:Timeless Eyeglasses     2021-05-03
u003cbru003eCompare my country's current standards GB2457 and GB10810. 3 with European standards EN1836 and American standards ANSI280.3. The differences in the detection items of sunglasses involve the following contents: spectral performance, optical power, prism, surface quality, flame retardancy Performance, mechanical strength, etc. 1. Spectral performance (1) Transmittance and classification in the visible spectrum area. It is well known that people usually distinguish and classify sunglasses according to the visible spectrum (380 to 780, transmittance rv). However, the classification of sunglasses in various countries A certain difference, which means that sunglasses products should be marked differently when sold in different countries. ANSI Z80. 3 divides sunglasses into four categories: light-colored sunglasses, sun-shading glasses, special-purpose sunglasses, and dark-purpose sunglasses. Sunglasses; EN1836 and AS/NZS 1067 divide sunglasses into 5 categories: O, 1, 2, 3, and 4; while China’s national standard GB10810. 3 divides sunglasses into 4 categories: 1, category, Class 2, Class 3, and Class 4 do not include dyed mirrors with a visible light transmittance of more than 80% in the category of sunglasses. (2) Ultraviolet spectrum transmittance This indicator refers to sunglasses in the ultraviolet spectrum (280 nm~380 nm) allowable transmittance. The quality of this index is directly related to the wearer’s physical and mental health. The relevant standards of various countries have adopted UVA (315 nm~380 nm) and UVB (280 nm~315 nm) wavelength bands. The transmittance is limited. (3) Requirements for driving mirrors. Both driving and driving sunglasses must meet the requirements of spectral transmittance and traffic signal identification. (4) Other requirements for spectral performance items except the above In addition to several requirements, the standard also involves the light transmittance requirements of special lenses such as photochromic sunglasses, gradient colored sunglasses, polarized sunglasses, etc. The specific content of the national standards is basically the same. 2. Optical power and prism in EN1836:2005 The sunglasses are divided into two grades. Different grades have different requirements for optical power and prism. 3. Material and surface quality Countries have certain requirements for the surface quality of sunglasses, but the description is slightly different. To sum up , Can be simply expressed as follows: In the light and dark background without the aid of optical magnification device, the inspection is carried out to identify whether there are bubbles, scratches, impurities, mildew, scratches, stains, etc. in the central area of u200bu200bthe lens (usually 30 mm in diameter) Quality problems such as blisters, cracks, etc. 4. The flame retardancy test method is the same in the three standards of EN1836.AS/NZS 1067 and QB2457: use a steel rod heated to (650 ± 20) ℃ to maintain on the sample (5±0.5) s and then move away to observe whether the sample continues to burn. In AN-SI Z80. 3, the sample is placed in an environment of (200±5)℃ for (15±1) min to observe whether the sample Will burn. These two methods seem to be very different, but in essence they are exploring whether the sample will burn under high temperature conditions. 5. Mechanical strength There are currently three experimental methods for mechanical strength testing: impact resistance test , Squeeze test and nose bridge deformation test. (1) The impact test method is roughly as follows: use a steel ball with a mass of about 16 g and a diameter of about 16 mm. After falling on the center of the lens from a height of 1.27 m, observe the lens Whether rupture occurs. This requirement is mentioned in these standards, but the mandatory aspects are slightly different. This clause is mandatory in QB2457, AS/NZS1067 and ANSI Z80. 3, while it is only an optional requirement in EN1836. For lenses that are expressly protected or comply with ANSI (American National Standards), they must be able to withstand the impact of a 16g steel ball in a free fall from a height of 1.27 m without breaking. This indicator is a low requirement for glasses with protective functions. If it is clearly stated that the lenses have protective functions but fail to pass this standard, it may mislead consumers to wear a pair of glasses that they consider to be safe in unsafe situations. If an accident occurs, it will directly endanger consumers' eyes. (2) The requirements in the two standards of EN1836 and AS/NZS 1067 for the extrusion test: the lens is subjected to a steel ball with a diameter of 22 mm, the speed is not more than 400 mm/min, and the load is (100 ± 2) N pressure should not cause lens fragmentation Or the lens is deformed. But there is no such provision in QB2457 and ANSI Z80.3. (3) Nose bridge deformation test After being pressurized by the nose bridge deformation testing machine, the geometric center distance of the spectacle frame and its original state deformation percentage does not exceed ±2%, and the lens does not fall out of the spectacle frame. In addition to the above items, some countries have also formulated some special regulations for sunglasses. For example, EN1836 and AS/NZS1067 have restrictions on scattered light and anti-aging properties. EN1836 stipulates that the nickel emission cannot exceed 0.5μg/cm2/week. and many more.
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