NR 422.151(3)(b) (b) Metal coating operations using the following types of coatings are exempt from the VOC content limitations specified under sub. (4) and the application methods specified under sub. (5):

NR 422.151(3)(b)1. 1. Stencil coatings.

NR 422.151(3)(b)2. 2. Safety-indicating coatings.

NR 422.151(3)(b)3. 3. Solid-film lubricants.

NR 422.151(3)(b)4. 4. Electric-insulating and thermal-conducting coatings.

NR 422.151(3)(b)5. 5. Magnetic data storage disk coatings.

NR 422.151(3)(b)6. 6. Plastic extruded onto metal parts to form a coating.

NR 422.151(3)(c) (c) Metal coating operations using the following types of coatings are exempt from the application methods specified under sub. (5):

NR 422.151(3)(c)1. 1. Touch-up coatings.

NR 422.151(3)(c)2. 2. Repair coatings.

NR 422.151(3)(c)3. 3. Texture coatings.

NR 422.151(4) (4) Emission limits.

NR 422.151(4)(a) (a) Except as specified under par. (b), the owner or operator of a metal parts coating operation located at an affected facility under this section shall use the low-VOC coatings that meet the VOC content limits in Table 6 for the affected metal coating operations. If more than one VOC content limit applies to a specific coating, the most stringent VOC content limit shall be applied.

Table 6

VOC Content Limitations for Coatings Used in Metal Parts and Products Coating – Low-VOC Coatings

[kilogram/liter (pounds/gallons) of coating, excluding water and exempt compounds listed in s. NR 400.02 (162) (a), as applied]

- See PDF for table

NR 422.151 Note Note: The VOC content limits for the coating and application types under Table 6 rows 1. a. to 2. y. apply to any coating that does not meet the definitions for the specific coatings listed under Table 6 rows 3. a. to 4. h.

NR 422.151(4)(b) (b) If the low-VOC coatings that meet the VOC content limits required under par. (a) are not used at an affected facility, the owner or operator shall use add-on control equipment that achieves a minimum overall emission reduction efficiency of 90 percent for VOC.

NR 422.151(5) (5) Application methods. An owner or operator of an affected facility under this section, except for a facility that uses add-on control equipment as described under sub. (4) (b), shall use one or a combination of the following application methods for the affected coating operations:

NR 422.151(5)(a) (a) Electrostatic application.

NR 422.151(5)(b) (b) High-volume, low-pressure spray equipment.

NR 422.151(5)(c) (c) Flow coating.

NR 422.151(5)(d) (d) Roll coating.

NR 422.151(5)(e) (e) Dip coating, including electrodeposition.

NR 422.151(5)(f) (f) Airless spray.

NR 422.151(5)(g) (g) Air-assisted airless spray.

NR 422.151(5)(h) (h) Other coating application methods that are capable of achieving a transfer efficiency equivalent or better than achieved by high-volume, low-pressure spraying and are approved by the department.

NR 422.151(6) (6) Add-on control equipment requirements. An owner or operator that uses add-on control equipment as described under sub. (4) (b) shall comply with the applicable monitoring, testing, and recordkeeping requirements under ss. NR 439.04 (5) (e), 439.055, and 439.075.