From: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**>
Subject: Re: [DCHAS-L] Examples of Control banding and Chemical Safety Levels
Date: Tue, 3 May 2016 13:46:36 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: A45AA198-A685-4C88-AAEA-7C209965D400**At_Symbol_Here**
In-Reply-To <01ac01d1a4c2$6dca9a20$495fce60$**At_Symbol_Here**>

> Does the group think it appropriate to apply the concepts to particle size, based upon aerosol deposition or can it be expanded to the classification of exposures based upon GHS classifications?

The challenge I see there is that there are multiple hazards with chemical vapors beyond those controlled by ventilation. For example, corrosive liquids or those with oxidizing capability are GHS classifications that wouldn't be controlled by ventilation. Are you thinking in terms of the health hazard classifications within GHS?

> >I would be very curious if the members have reviewed and compared control
> banding with the processes identified as generating aerosols from the CDC's

This brings up an interesting question: is it better to build a control banding scheme around the inherent hazards of an operation or around the observed incidents when performing the process. For example, many of the aerosol sources identified in this document are process or behavior based rather than inherent to the hazardous material. One difference is that biosafety control banding uses a different approach to chemical control banding.

Thanks for your comments.

- Ralph

Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College


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