Step-by-step explanation:
The specific requirements and regulations regarding the use of supplied-air respirators for tasks involving paint containing isocyanates can vary depending on the jurisdiction and the specific workplace safety standards in place. There isn't a universally fixed limit in terms of ounces of paint containing isocyanates for every situation.
To determine the exact limit that applies to your situation, it is crucial to consult the safety regulations and guidelines established by relevant authorities, such as the Occupational Safety and Health Administration (OSHA) in the United States or similar agencies in your region. These regulations typically specify permissible exposure limits (PELs) and requirements for respiratory protection based on the type of hazardous materials and the level of exposure.
In general, when working with hazardous substances like isocyanates, it is essential to follow safety guidelines and use appropriate respiratory protection equipment as required by the regulations in your area to ensure the health and safety of workers. Please consult the specific regulations applicable to your location and industry for precise information.