UDL, uniform distributed load, is a phrase commonly used by shelving suppliers to help explain how much weight can be safely stored on each shelf section. A uniform distributed load dictates that products should be stored evenly with no single point handling excessively more load than the remainder of the shelf.
UDL value is essential as the weight capacity of any shelf is reduced if loaded unevenly. If the load is spread evenly and correctly across the whole width of the shelf this greatly reduces the stress placed on any structural beams and uprights. A UDL allows the maximum load to be safely applied.
When you see the UDL value stated on any or shelving product description you should use this to evaluate and calculate whether the selected item is appropriate for your storage needs. If you feel you will be storing items close to the UDL level, then it is recommended that you upgrade your choice of shelving or racking to a product with a higher capacity to reduce the possibility of overloading.
This model is in specification of 200Kg UDL compare to normal market file storage in 80kg to 120kg. the test was done by SIRIM Malaysia.