Shenzhen Deepward Eyewear Co.,Ltd

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Artificial sweat testing is used to evaluate the corrosion resistance and durability of eyewear materials over prolonged wear. This test simulates the composition of human sweat by immersing the eyewear in an artificial sweat solution and maintaining specific temperature and humidity conditions for a set duration. The testing solution typically includes components like sodium chloride, urea, and lactic acid, simulating the pH of human sweat (usually between 4 and 6). The testing temperature is generally set between 30°C and 40°C, with a testing duration of 48 to 72 hours. After the test, the eyewear should exhibit no significant corrosion, discoloration, or structural damage, ensuring its durability and safety in actual use. Our company's metal plating can usually pass 48H artificial sweat testing.

A polarization tester is used to evaluate the polarization effect and quality of polarized eyeglass lenses. This tester measures the lenses' ability to filter specific light waves, ensuring they effectively reduce glare and enhance visual clarity and comfort.

The standard testing procedure involves placing the polarized lenses in the tester, rotating the lenses, and adjusting the light source to measure their light transmittance and polarization angle. The polarization tester should accurately display the intensity and direction of the transmitted light, ensuring the lenses effectively block scattered and reflected light.

Testing standards typically require the polarized lenses' light transmittance to be within a specific range, and the polarization angle should be kept within +/- 1°..

The welding test for eyeglass in the eyewear industry is conducted to evaluate the quality and strength of the welding points. Typically, apply a force of 10 to 20 Newtons to the welded joints, repeatedly bending them at an angle of 30 to 45 degrees for multiple cycles to check for cracks, fractures, or looseness. Standards require the testing equipment to precisely control the applied force and angle, and the testing conditions should simulate various situations encountered in actual use. Through this test, it ensures that the welding points of eyeglass frames have sufficient strength and durability to withstand various pressures and stresses encountered in daily use, ensuring the safety and stability of the eyeglasses.

The hinge durability test for eyeglass frames is used to evaluate the long-term durability and reliability of the hinges. The test involves repeatedly opening and closing the hinges to simulate the number of times an eyeglass hinge would be used in daily life, checking for looseness, breakage, or failure. Typically, a force of 0.5 to 1.0 Newton-meters (Nm) is applied, and the hinge is repeatedly opened and closed at an angle of approximately 90 to 135 degrees. Generally, a minimum of 10,000 opening and closing cycles is required to pass the test. The screwless hinges produced by our company can endure up to 30,000 opening and closing cycles without showing any signs of looseness, breakage, or failure.

The drop ball test for sunglasses is used to assess the impact resistance of the lenses, ensuring their safety and durability in daily use. During the test, a steel ball of a specific weight is dropped from a certain height, directly striking the lens surface to simulate accidental impacts or collisions. Typically, a 16-gram steel ball is used, dropped from a height of 1.27 meters (50 inches). After the impact, the lenses should not show any signs of cracking, penetration, or separation, and must maintain their optical performance and structural integrity. Usually, U.S. Customs requires a drop ball test report for clearance.

The size reading test in the eyewear industry aims to evaluate the dimensions of lenses, ensuring they comply with design specifications and manufacturing requirements. During the test, appropriate instruments are used to measure parameters such as the width, height, and perimeter of the lenses. Standards dictate that the measurement results should align with the requirements outlined in the product specification sheet, ensuring that the lens dimensions meet both CE standards and customer demands. Typically, the actual width of the frame should not deviate by more than 5mm, and the actual height of the frame should not deviate by more than 3mm. Through this test, the production of eyeglass lenses with consistent size and quality is ensured, providing excellent visual performance and a comfortable wearing experience.

The stress test for sunglasses is part of international and industry standards, such as ISO 12312-1 and ANSI Z80.3, ensuring compliance with these standards, meeting market and regulatory requirements, and enhancing brand credibility. Through stress testing, sunglasses can be ensured to withstand various impacts and pressures in daily use without fracturing or producing hazardous fragments, thus protecting the wearer's eyes from harm. It also ensures that the lenses do not deform or suffer a decline in optical performance under stress, ensuring clear and comfortable vision for the wearer. Stress induced by compression is typically acceptable if located in the B zone; however, if in the A zone, special attention is needed to ensure no significant impact on optical performance.