From: "Buczynski, Michael" <Michael.Buczynski**At_Symbol_Here**RB.COM>
Subject: Re: [DCHAS-L] Ear muffs
Date: Tue, 19 Aug 2014 11:35:03 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 14AAD9DC657DF948AE6AC4668C6236534BF565DD**At_Symbol_Here**

First: Is it possible to enclose the Sonicator. If the Sonicator is an ultrasonic device use Plexiglas since high frequency sound is attenuated by a Plexiglas barrier.  In a previous job we had a sonic probe cleaning /dispersive device and the Plexiglas enclosure was wonderful.  Second: You may want to contact Fisher Scientific as they may already have fabricated a type of clear Plexiglas box with an access door on it. Third: contact some Hearing protection equipment manufacturers to see what they provide for this frequency range.  Hope this helps.



Michael A. Buczynski



Director Regulatory Compliance

North America

Reckitt Benckiser

399 Interpace Parkway

Parsippany, NJ USA 07054-0225


T: +1-973.404.2484

M: +1-973.570.9457



Please think before you print.




From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU]On Behalf Of Harry J. Elston
Sent: Tuesday, August 19, 2014 7:21 AM
Subject: Re: [DCHAS-L] Ear muffs




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
Company Information
Twitter: **At_Symbol_Here**MidwestChemSafe

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