FIBCs are exposed to sunlight and UV radiation at different levels. They can be filled and stored outside in direct sunlight or stored inside a warehouse or factory with limited exposure from open windows or doors. The contact with UV radiation can cause degradation of the woven polypropylene fabric, so the ISO standard on FIBCs states that additives may be used to improve resistance.
So, is there enough UV resistance present in your FIBC to protect it? This is a question we ask regularly at Global-Pak to ensure our bags meet the ISO standards. We take multiple samples from across our product line to verify that our bags meet this requirement.
We test our FIBCs for UV resistance based on the ISO 21898 Standard. Our testing is done in-house on our QUV Accelerated Weather Tester and recently purchased Tensile Testing machine. First, we do a control sample to record the breaking point and elongation for all load bearing fabric. Once we have our control tests, we begin the UV test process.
The UV test involves exposing a test specimen to a fluorescent UV lamp for a minimum of 200 hours. Then, we alternate between 8 hours UV radiation and 4 hours of 50-degree Celsius condensation. Once the test bag has been exposed for the proper amount of time, we test the strength further. To pass “all load bearing materials of a FIBC must retain at least 50% of the original values of the breaking force and elongation of the material.” Global-Pak tests our bulk bags internally because we want to provide quality products to our customers. Our hope is that they can concentrate on their products while feeling confident about the safety of our bulk packaging.