29 C.F.R. § 1910.133
(a) General requirements.
(5) The employer shall ensure that each affected employee uses equipment with filter lenses that have a shade number appropriate for the work being performed for protection from injurious light radiation. The following is a listing of appropriate shade numbers for various operations.
| Filter Lenses for Protection Against Radiant Energy | |||
|---|---|---|---|
| Operations | Electrode Size 1⁄32 in. | Arc Current | Minimum* Protective Shade |
| Shielded metal arc welding | Less than 3 | Less than 60 | 7 |
| 3-5 | 60-160 | 8 | |
| 5-8 | 160-250 | 10 | |
| More than 8 | 250-550 | 11 | |
| Gas metal arc welding and flux cored arc welding | less than 60 | 7 | |
| 60-160 | 10 | ||
| 160-250 | 10 | ||
| 250-500 | 10 | ||
| Gas Tungsten arc welding | less than 50 | 8 | |
| 50-150 | 8 | ||
| 150-500 | 10 | ||
| Air carbon | (Light) | less than 500 | 10 |
| Arc cutting | (Heavy) | 500-1000 | 11 |
| Plasma arc welding | less than 20 | 6 | |
| 20-100 | 8 | ||
| 100-400 | 10 | ||
| 400-800 | 11 | ||
| Plasma arc cutting | (light)** | less than 300 | 8 |
| (medium)** | 300-400 | 9 | |
| (heavy)** | 400-800 | 10 | |
| Torch brazing | 3 | ||
| Torch soldering | 2 | ||
| Carbon arc welding | 14 |
| Filter Lenses for Protection Against Radiant Energy | |||
|---|---|---|---|
| Operations | Plate thickness—inches | Plate thickness—mm | Minimum* Protective Shade |
| Gas Welding: | |||
| Light | Under 1/8 | Under 3.2 | 4 |
| Medium | 1/8 to 1/2 | 3.2 to 12.7 | 5 |
| Heavy | Over 1/2 | Over 12.7 | 6 |
| Oxygen cutting: | |||
| Light | Under 1 | Under 25 | 3 |
| Medium | 1 to 6 | 25 to 150 | 4 |
| Heavy | Over 6 | Over 150 | 5 |
| * As a rule of thumb, start with a shade that is too dark to see the weld zone. Then go to a lighter shade which gives sufficient view of the weld zone without going below the minimum. In oxyfuel gas welding or cutting where the torch produces a high yellow light, it is desirable to use a filter lens that absorbs the yellow or sodium line in the visible light of the (spectrum) operation. | |||
| ** These values apply where the actual arc is clearly seen. Experience has shown that lighter filters may be used when the arc is hidden by the workpiece. |
(b) Criteria for protective eye and face protection.
(1) Protective eye and face protection devices must comply with any of the following consensus standards:
[59 FR 16360, Apr. 6, 1994; 59 FR 33911, July 1, 1994, as amended at 61 FR 9238, Mar. 7, 1996; 61 FR 19548, May 2, 1996; 74 FR 46356, Sept. 9, 2009; 81 FR 16090, Mar. 25, 2016]