---
title: Construction Tests
url: "https://www.filtral.com/en/quality/norms-standards/construction-tests/"
description: "Construction Tests: Read more about how we test the durability and resilience of sunglasses or reading glasses."
date: 2018-08-31
modified: 2019-03-07
locale: en_GB
---

# Construction Tests

CONSTRUCTION TESTS
====================

      ![Example construction tests for reading glasses and sunglasses.](https://d3rbxgeqn1ye9j.cloudfront.net/images/X-4LBTocjl23UOoaBzX6K2l-g0HTCSkFHxDktnEjZiI/w:345/h:121/fn:Y3NtX2hlYWRlcmJpbGQtbWVjaGFuaXNjaGUtcHJ1ZWZ1bmdfNGExMTgxMmJlMQ:t/cb:e8753a329452924417c311b81331afd51aff190c/el:1/fq:jpeg:85:avif:70:webp:80/aHR0cHM6Ly9kM3JieGdlcW4xeWU5ai5jbG91ZGZyb250Lm5ldC9maWxlYWRtaW4vd3d3LmZpbHRyYWwuY29tL1F1YWxpdGFldC9oZWFkZXJiaWxkLW1lY2hhbmlzY2hlLXBydWVmdW5nLmpwZz8xNTQ3NDU2MzU0)

 In order to test the durability and resilience of sunglasses or reading glasses, the mechanical properties of the glasses are tested alongside the optical properties.

 **Glasses endurance test**

With this test, the durability of the hinges is tested. During the test, the glasses are clamped in a device and the hinges are put under strain from a variety of different angles. After 500 cycles, the hinges should not be “worn out” or overstretched and must still be fully functional.

**Deformation test**

This test checks to see whether the sunglasses or reading glasses have the strength required by the standards. The glasses are stretched out on a retention device and pressure is placed on the lenses. After the test is ended, the frames should not have deviated from their original form by more than 2%. They should also not break and the lenses should not fall out of the frames.

 **Mechanical strength**

In the so-called “ball drop test” a 16 g steel ball is dropped onto the lenses from a height of 1.27 m. The lenses should not break, splinter or fall out of the frames upon impact.

**Further mechanical test**

- Flammability test
- Perspiration resistance test
- UV irradiation of the lense

 **Here you can find more information about quality at FILTRAL:**

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