Current standards for arc flash thermal protective products are manufactured to comply with a variety of ASTM and ANSI standards. The standards dictate how products should be tested.  They do not require any retesting of the garments after manufacturing as the current tests are destructive in nature and would render the PPE unusable after testing.
It is advisable for the user, before and after every use of an arc flash PPE product, whether it be a coat, pants, hood face shield, or accessory, to inspect the product for damages, including rips and tears, as well as any soiling, especially oil or other combustible material, which could adversely impact the arc thermal protective characteristics of the product. If any damage or soiling occurs, the user should not use that product until cleaning or repairs are made in accordance with the instructions of the manufacturer.
Additionally, it is important to not reuse an arc flash protective product after an exposure to an arc incident.
Your arc flash protection, when properly selected and worn, can save your life, protecting you against the thermal energy of an arc incident, preventing the onset of a second-degree burn. Proper care and respect should be taken in the handling and care of your protection.