One of the real benefits of the Belfasun™ is its resistance to laundering. A cotton fabric treated with Belfasun™ nano sun protection is able to withstand at least 40 household (i.e. moderate temperature) washes – which roughly corresponds to the average lifetime of a garment. An exceptionally wash-resistant bonding system keeps the nano zinc oxide particles anchored and in place, giving the Belfasun™ treatment this exceptional permanence. The UV-protective capacity of Belfasun™ has been tested in accordance with German UV Standard 801 of the renowned Hohenstein Institutes. As the internationally most stringent specification of its type, it takes into full account realistic usage patterns. In this test process, the UVA and UVB radiation shield afforded by the textile is investigated to determine its overall ultraviolet protection factor (UPF). This screening effect must remain intact in the stretched, wet state, even after 40 washes. The following diagram illustrates the UPF values achieved with Belfasun™ under different stressing conditions with the fabric wet. The Belfasun™ treatment still ensures attainment of the requisite values for the UV 40 certification according to UV Standard 801, even after 40 washes.