Safety data for silicon
The information on this web page is provided to help you to work safely, but it is intended to be an overview of hazards, not a replacement for a full Material Safety Data Sheet (MSDS). MSDS forms can be downloaded from the web sites of many chemical suppliers.
Toxicity data
Risk phrases
Safety phrases
[Return to
Physical & Theoretical Chemistry Lab. Safety home page.]
This information was last updated on October 3, 2007.
We have tried to make it as accurate and useful as possible,
but can take no responsibility for its use, misuse, or
accuracy. We have not verified
this information, and cannot guarantee that it is up-to-date.
Note also that the information on the PTCL Safety web site, where this page
was hosted, has been
copied onto many other sites, often without permission. If you have any
doubts about the veracity of the information that you are viewing, or have any queries,
please check the URL that your web browser displays for this page.
If the URL begins "http://msds.chem.ox.ac.uk/" the page
is maintained by the Safety Officer in Physical Chemistry at Oxford University.
If not, this page is a copy made by some other person and we have no responsibility
for it. General
Synonyms: defoamer S-10
Molecular formula: Si
CAS No: 7440-21-3
EINECS No: 231-130-8
Physical data
Appearance: grey lustrous solid or grey powder
Melting point: 1410 C
Boiling point: 2355 C
Vapour density:
Vapour pressure:
Density (g cm-3): 2.33
Flash point:
Explosion limits:
Autoignition temperature:
Stability
Stable. Fine powder is highly flammable. Incompatible with oxidizing agents,
bases, carbonates, alkali metals, lead and aluminium oxides, halogens, carbides,
formic acid.
Toxicology
Generally regarded as safe. Typical TLV (TWA) 10 mg/m3.
(The meaning of any abbreviations which appear in this section
is given
here.)
ORL-RAT LD50 3160 mg kg-1
(The meaning of any risk phrases which appear in this section is
given here.)
R11 (powder).
Transport information
(The meaning of any UN hazard codes which appear in this section
is given
here.)
Non-hazardous for air, sea and road freight (bulk material). UN No 1346.
Hazard class 4.1. Packing group III (powder).
Personal protection
Minimize contact.
(The meaning of any safety phrases which appear in this section
is given here.)
S16 S43.