Test of the impact resistance of sunglasses

The impact resistance test of sunglasses is an important step in evaluating the durability of sunglasses when subjected to external force impacts. The following is a detailed analysis of this test:

Test purpose

Test the durability of the lenses when subjected to external force impacts to prevent them from cracking or falling off due to the impact, thereby endangering the safety of the users.

Test standard

Different countries and regions have different testing standards, but it is generally required that the lenses should not crack or show obvious deformation after being impacted by specific conditions. For instance, some international standards require that a steel ball of a specific mass and diameter be freely dropped from a certain height to impact the lens, and after the impact, it should be observed that the lens must not shatter.

Test method

Drop ball impact test

Fix the lens to the human head model or a specific device to withstand the impact of the steel ball.

The mass, diameter and impact height of the steel balls are determined according to the test standards.

Observe whether the lens breaks or shows obvious deformation after impact.

Other impact testing methods:

In addition to the drop ball impact test, other impact testing methods may also be adopted, such as the ejection body test of the ejection propulsion device, etc., to simulate the impact conditions under different circumstances.

Test conditions

Laboratory environment

Tests are usually conducted in specific laboratory environments, such as temperatures ranging from 20°C to 25°C and relative humidity between 40% and 70%.

These conditions can ensure the accuracy of the test results to the greatest extent.

Sample preparation:

The test samples should be representative products to ensure the reliability of the test results.

Samples should be prepared and processed in accordance with the requirements of the test standards.

Evaluation of test results

Lens breakage condition:

Observe whether the lens breaks after impact, and the extent and range of the breakage.

If the lens breaks into multiple pieces or shows obvious cracks, it is judged as unqualified.

Lens deformation condition:

Check whether the lens shows obvious deformation, such as bending or twisting, after impact.

If the lens deforms and affects the visual effect or wearing comfort, it will be judged as unqualified.