The maximum quantity of Class I solvents permitted at any work station shall be 1 gallon (4 L). Spotting or prespotting shall be permitted to be conducted with Class I solvents where they are stored in and dispensed from approved safety cans or in sealed DOT-approved metal shipping containers of not more than 1-gallon (4 L) capacity.
Spotting and prespotting shall be permitted to be conducted with Class I solvents where dispensed from plastic containers of not more than 1 pint (0.5 L) capacity.
Scouring, brushing, and spotting and pretreating shall be permitted to be conducted with Class II or III solvents. The maximum quantity of Class II or III solvents permitted at any work station shall be 1 gallon (4 L). In other than Group H-2 occupancy, the aggregate quantities of solvents shall not exceed the maximum allowable quantity per control area for use-open system.
Where approved, articles that cannot be washed in the usual washing machines are allowed to be cleaned in scrubbing tubs. Scrubbing tubs shall comply with the following:
- Only Class II or III liquids shall be used.
- The total amount of solvent used in such open containers shall not exceed 3 gallons (11 L).
- Scrubbing tubs shall be secured to the floor.
- Scrubbing tubs shall be provided with permanent 11/2-inch (38 mm) drains. Such drain shall be provided with a trap and shall be connected to an approved container.
Scrubbing tubs, scouring, brushing or spotting operations shall be located such that solvent vapors are captured and exhausted by the ventilating system.
Metal scouring, brushing and spotting tables and scrubbing tubs shall be permanently and effectively bonded and grounded.