Testing Results

MILWAUKEE TOOL

13135 West Lisbon Road • Brookfield WI 53005 • 262-781-3600

8/7/2017

29 CFR 1926.1153

Milwaukee

OSHA

Compliance Solutions

To Whom It May Concern,

Milwaukee

, in partnership with Industrial Hygiene Sciences, LLC, has conducted testing on the

Milwaukee 49-40-6105 7” Universal Surface Grinding Dust Shroud paired with the Milwaukee 8960-20

8 Gallon Dust Extractor. Results show that the user will be below the Permissible Exposure Limit (PEL)

as described by OSHA 29 CFR 1926.1153 when using the 49-40-6105 7” Universal Surface Grinding

Dust Shroud in conjunction with the 8960-20 8 Gallon Dust Extractor assuming it is used in accordance

with manufacturer’s instructions. Testing results and procedures are outlined below:

 All grinding was performed using a 7” Milwaukee 6088-30 Large Angle Grinder equipped with

the 49-93-7720 7” Diamond Cup Wheel. The 7” Universal Surface Grinding Dust Shroud was

connected to the Milwaukee 8960-20 8 Gallon Dust Extractor equipped with HEPA filtration.

The automatic filter was turned to “ON” mode.

 Concrete blocks were poured from a 5000 PSI concrete mix.

 The room size was 12’9” x 26’5” x 8’

 The room surfaces were wiped down between trials to ensure accurate measurements

 Samples were analyzed using OSHA ID-142 by the Wisconsin Occupational Health Laboratory,

an AIHA Accredited laboratory. The sampling method used meets the definition of respirable

crystalline silica in 1926.1153 (a) and Appendix A of the OSHA Respirable Crystalline Silica

Standard (1926.1153).

 The Time Weighted Average (TWA) was calculated assuming zero exposure to respirable

crystalline silica for the non-sampled portion of a 480 minutes (8 hour) shift. Longer exposure

times, assuming that the dust exposures would be similar to those collected in these trials, would

likely result in higher TWAs. Factors that would affect actual user exposures include, but are not

limited to, the ventilation and air flow patterns in the work space, the presence of other respirable

silica dust generating activities in the area, and the method used to empty the extractor.

It is the responsibility of the user to operate the tool in accordance with manufacturer’s instructions. For

the latest listings of approvals, visit milwaukeetool.com. For technical or service assistance, contact

Milwaukee Customer Service at 1-800-729-3878.

PAGE 1
MILWAUKEE TOOL 13135 West Lisbon Road • Brookfield WI 53005 • 262-781-3600 8/7/2017 29 CFR 1926.1153 Milwaukee® OSHA® Compliance Solutions To Whom It May Concern, Milwaukee®, in partnership with Industrial Hygiene Sciences, LLC, has conducted testing on the Milwaukee 49-40-6105 7” Universal Surface Grinding Dust Shroud paired with the Milwaukee 8960-20 8 Gallon Dust Extractor. Results show that the user will be below the Permissible Exposure Limit (PEL) as described by OSHA 29 CFR 1926.