From: Allen Niemi <anniemi**At_Symbol_Here**MTU.EDU>
Subject: Re: [DCHAS-L] Pyrophorics
Date: Fri, 25 Sep 2015 08:36:40 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: CAN0bzO7kvth5aK8Rc5aXfFXsuU53yG5Ef2FO4M31M-xYhSh0Vg**At_Symbol_Here**mail.gmail.com
In-Reply-To <012201d0f705$aa33c100$fe9b4300$**At_Symbol_Here**chemical-safety.com>


My guess is that this has not been well studied or published in general and, unless you are interested only in gases and liquids (vs mists or droplets), the limiting oxygen concentration can vary widely depending on particle/droplet size and particle shape (and temperature, of course). This is based primarily on my own experience with pyrophoric metal powders as well as some Bureau of Mines literature on combustible dusts I remember reading decades ago. Surface energy and reactivity is related to surface radius of curvature. For a beaker of liquid or very large droplets and gases, surface curvature has no real meaning.

Al

On Thu, Sep 24, 2015 at 4:14 PM, NEAL LANGERMAN <neal**At_Symbol_Here**chemical-safety.com> wrote:

Does anyone have any citations for the low limiting oxygen concentration of pyrophoric compounds. I am specifically looking for the oxygen percentage at which compounds such as t-BuLi become non-ignitable. For example, that value is 5% for hydrogen. I have found a reference for silane, but, as is typical for silane, there are a myriad of confounding issues.

I have searched both SciFinder and Science Direct and have not found helpful data.

Thanks

Neal

------------------------------------------------------------------------------------

The information contained in this message is privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer.

ACSafety has a new address:

NEAL LANGERMAN, Ph.D.

ADVANCED CHEMICAL SAFETY, Inc.

PO Box 152329

SAN DIEGO CA 92195

011(619) 990-4908 (phone, 24/7)

www.chemical-safety.com

We no longer support FAX.

Please contact me before sending any packages or courier delivery. The address for those items is:

5340 Caminito Cachorro

San Diego CA 92105




--
Allen Niemi, PhD
Director
Occupational Safety and Health Services
Room 322 Lakeshore Center
Michigan Technological University
Phone: 906-487-2118
Fax: 906-487-3048

Previous post   |  Top of Page   |   Next post



The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to secretary@dchas.org.
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.