From: Harry J. Elston <helston**At_Symbol_Here**MIDWESTCHEMSAFETY.COM>
Subject: Re: [DCHAS-L] Ear muffs
Date: Tue, 19 Aug 2014 06:21:00 -0500
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: CAJ2hcffZnw0jhgk_xqz3ug+JOOGWKB+wZBt+D4MGTP=730Vpyw**At_Symbol_Here**
In-Reply-To <18131388.1408417288284.JavaMail.root**At_Symbol_Here**>


You may want to consider performing your own investigation using a dosimter in combination with a sound pressure level meter equipped with an octave band filter so you can actually find out frequency range you're getting your biggest dose and the actual dose when using the equipment. Then assign PPE based on your analysis. I would be surprised if you reach the 85 dbA action level required by the standard to implement a hearing conservation program - but the only way to be sure is to measure.


On Mon, Aug 18, 2014 at 10:01 PM, <psonnenfeld**At_Symbol_Here**> wrote:
Our folks are partial to Peltor muffs.
Are there no ear plugs that meet your noise reduction rating criterion?


-----Original Message-----
From: Wayne Phan
Sent: Aug 18, 2014 11:31 AM
Subject: [DCHAS-L] Ear muffs

Hi all,

Some of the students in our biochemistry use a sonicator (Fisher Scientific Model 100 Ultrasonic Dismembrator). This sonicator emits a high-pitched sound. I know that in some labs, people wear ear muffs when using the sonicator. I think it would be the safest thing if our students also had ear muffs to wear when using this instrument. Any recommendation for an appropriate lab-safety type of earmuff?



Harry J. Elston, Ph.D., CIH
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