1. The visual field on the visual field side shall not be less than 80 (. For an eye protection device consisting of two lenses, the minimum lower field of view is 60 (; For monocular protectors, the minimum lower visual field is 67 (.
2. Specifications and dimensions
Round lens: 45mm in diameter;
Molded lens: 45mm (horizontal reference line length) ×35mm (vertical height);
Single lens goggles and mask: 105mm×50mm.
Thickness: 2 ~ 3.5 mm.
Head bandwidth: not less than 10 mm.
3. Structural requirements:
(1) The surface is smooth and free of burrs. Sharp corners or other defects that may cause eye or facial discomfort.
(2) Adjustable parts or structural parts should be easy to adjust and replace.
(3) Good air permeability.
(4) The materials used in the eye mask headband are soft and durable.
(5) The protective scope of protective glasses must include the front and side.
4. Material requirements:
(1) has appropriate strength and elasticity.
(2) It cannot be made of materials harmful to the skin.
(3) It cannot be made of flammable materials such as nitrocellulose.
(4) The lens shall be made of plastic sheet, adhesive sheet or tempered glass sheet. Ordinary glass sheets can only be used near the back of these lenses.
5. Technical performance requirements
(1) High strength impact resistance
The glass used for high-strength impact resistance should be able to withstand the impact of a steel ball with a diameter of 22mm and a weight of 45g falling freely from the height of1.3m..
(2) The impact resistance of high-speed particles should meet the requirements.
(3) Optical characteristics
The prism degree of the lens should be lower than 0.16d; ; The diopter is within (0. 125D) on any meridian; The diopter difference between any two meridians should be less than 0. 125D, and the visible light transmittance should be not less than 89%.
(4) Heat resistance
Put the lens in water at 67℃ (2℃), keep the temperature for 3 minutes, then take it out and put it in water below 4℃. There should be nothing unusual.
(5) Corrosion resistance
After removing the oil stains on the surface of metal parts, put them into boiling salt solution with the concentration of 10% (mass ratio), soak them for 15 minutes, take them out and dry them at room temperature for 24 hours, then wash them with warm water. After drying, observe that the surface should be free of corrosion.
(6) The wear resistance of plastic lenses shall meet the relevant requirements.
(7) Appearance quality of lens
Put the lens in the background, and visually inspect it with a 60W incandescent lamp. The surface should be smooth, without obvious defects such as scratches, ripples, bubbles and impurities.