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Previous by Date: Subject: Fwd: [DCHAS-L] National Library of Medicine ToxTutor adds new content Date: Tuesday, September 11, 2018 at 11:20:14 AM Author: DCHAS Membership Chair <membership**At_Symbol_Here**DCHAS.ORG> |
Next by Date: Subject: Re: [DCHAS-L] Auto-ignition temperatures Date: Tue, 11 Sep 2018 17:46:43 +0200 Author: Richard Palluzi |
For aluminum, classification depends on the size and shape of aluminum particles and most importantly, whether the particles have been exposed to air to create
an oxidized coating. For instance, unoxidized nm spherical aluminum under Argon should be handled as a pyrophoric substance as they can spontaneously ignite when exposed to air. Oxidized aluminum particles of larger sizes is what is used in pyrotechnics.
Tammy
From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU]
On Behalf Of Jeffrey Lewin
Sent: Tuesday, September 11, 2018 9:42 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Auto-ignition temperatures
The Alcoa GHS SDS I have for aluminum powder lists:
Product identifier ATOMIZED ALUMINUM POWDER
Auto-ignition temperature 1202 ¡F (650 ¡C) layered
Hazard statement May form combustible dust concentrations in air.
However, they also list DOT as not regulated.
The DOT Hazard Material Table lists:
Aluminum powder, coated as DOT 4.1 (Flammable Solid)
Aluminum powder, uncoated as DOT 4.3 (Dangerous when wet)
Jeff
On Tue, Sep 11, 2018 at 5:34 AM Debbie M. Decker <dmdecker**At_Symbol_Here**ucdavis.edu> wrote:
Hi All:
We're working through a list of materials classified as H250 (pyrophoric) but are having a terrible time finding auto-ignition data to back up that classification. It appears to have evaporated off Sigma SDS' and other sources (CRC, PubChem, ChemSpider, CAMEO) don't seem to have it either. Most irritating, to me, is the classification of powdered aluminum as pyrophoric with no auto-ignition data to back it up - just a note "ignites on contact with air." If that were the case, the entire pyrotechnic and propellant industries would have folded up by now.
Does anyone out there have auto-ignition data in a format they're able/willing to share? Or have any insight into where the data has gone off to?
Thanks mucho,
Debbie
Debbie M. Decker, CCHO, ACS Fellow
Past Chair, Division of Chemical Health and Safety
Councilor and Programming Co-Chair
University of California, Davis
dmdecker**At_Symbol_Here**ucdavis.edu
Birkett's hypothesis: "Any chemical reaction
that proceeds smoothly under normal conditions,
can proceed violently in the presence of an idiot."
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--
Jeff Lewin
Chemical Safety Officer
Compliance, Integrity, and Safety
Environmental Health and Safety
Michigan Technological University
Houghton, MI 49931
O 906-487.3153
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