SAFETY BRIEF: PPE, BY THE NUMBERS Arlington MA

The following contains industrial and manufacturing information you should know about PPE by the numbers. Read on if you or a loved one is interested in wood maintenance, safety, and news in Arlington.

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This month, Fabricating & Metalworking publishes a brief reference for some of the more intricate personal-protective-equipment requirements named throughout the OSHA regulations: namely, specific guidelines for selecting welding lenses, laser safety glass for goggles and, for ear protection, permissible noise exposure levels. (Source: OSHA's educational document on PPE, 3151-12R, 2003.)

Selecting Laser Safety Glass
Intensity, CW maximum power density (watts/cm²)	Attenuation
Intensity, CW maximum power density (watts/cm²)	Opticaldensity (O.D.)	Attenuation factor
Source: 29 CFR 1926.102(b)(2)
10^-2	5	10⁵
10^-1	6	10⁶
1.0	7	10⁷
10.0	8	10⁸

Permissible Noise Exposures
Duration per day, in hours	Sound level in dB*

8	90
6	92
4	95
3	97
2	100
1 1/2	102
1	105
1/2	110
1/4 or less	115

Filter Lenses for Protection against Radiant Energy
Operations	Electrode size in 1/32 inch (0.8 mm)	Arc current	Minimum*protective shade
Shielded metalarc welding	< 3 3 - 5 5-8 > 8	< 60 60 - 160 160 - 250 250 - 550	7 8 10 11
Gas metal arc welding and flux cored arc welding		< 60 60 - 160 160 - 250 250 - 500	7 10 10 10
Gas tungsten arc welding		< 50 50 - 150 150 - 500	8 8 10
Air carbon arc cutting	(light) (heavy)	< 500 500 - 1,000	10 11
Plasma arc welding		< 20 20 - 100 100 - 400 400 - 800	6 8 10 11
Plasma arc cutting	(light) (medium) (heavy)**	< 300 300 - 400 400 - 800	8 9 10
Torch brazing			3
Torch soldering			2
Carbon arc welding			14

Operation	Plate thickness (inch)	Plate thickness (mm)	Minimum* protective shade
Note: The data on this page are for informational purposes only and does not represent an official interpretation of safety rules and regulations.
Gas welding: Light Medium Heavy	< 1/8 1/8 - 1/2 > 1/2	< 3.2 3.2 - 12.7 > 12.7	4 5 6
Oxygen cutting:Light Medium Heavy	< 1 1 - 6 > 6	< 25 25 - 150 > 150	3 4 5

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