From: Christina Dillard <cdillard**At_Symbol_Here**MOS.ORG>
Subject: Re: [DCHAS-L] Dewar flask safety resources
Date: Mon, 12 Feb 2018 20:25:42 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: CY4PR04MB09022D4B3716E253CCFD3CACC6F70**At_Symbol_Here**
In-Reply-To <7AEAD8D6-8D1F-49A0-9905-021F71DDDCBC**At_Symbol_Here**>

Thank you for responses. Jim Kaufman reminded me that the “Eye and Face Protection in Chemical Laboratories” by Edward Peil Productions has a good Dewar flask implosion in slow motion. It even shows one imploding without incident when it is wrapped with electrical tape.


But I still want to know if anyone has established policies for length of time these are in service?  Do you take them out of service after so many years of use?


Thank you,




From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of ILPI Support
Sent: Friday, February 9, 2018 10:37 AM
Subject: Re: [DCHAS-L] Dewar flask safety resources


We've got some links to books and other web resources on cryogen safety at


Metal-cased dewars reduce some of the risk associated with traditional Dewars and are available from many vendors including my own company: 


Rob Toreki



Safety Emporium - Lab & Safety Supplies featuring brand names

you know and trust.  Visit us at

esales**At_Symbol_Here**  or toll-free: (866) 326-5412

Fax: (856) 553-6154, PO Box 1003, Blackwood, NJ 08012




On Feb 9, 2018, at 10:05 AM, Christina Dillard <cdillard**At_Symbol_Here**MOS.ORG> wrote:


Does anyone have a good reference for the safety of Dewar flasks?


Has anyone set limits on how long a Dewar flask may be in service before it must be replaced? What are those limits? What are they based upon?


Does anyone have a good video of a Dewar flask implosion?





Christina Dillard | Environmental Health & Safety (EHS) Program Manager

Museum of Science  | Facilities Dept.  |  One  Science Park  |  Boston, MA 02114-1099

P 617-589-4249 | F 617-589-0101 |M 781-789-1178| cdillard**At_Symbol_Here**  |



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