GPS Safety Summary Silicon tetrachloride

Technical information
GPS Safety Summary
Silicon tetrachloride
Substance name
Silicon tetrachloride
CAS-No. 10026-04-7
General statement
Silicon tetrachloride is used as raw material/intermediate in the production of
silicon, silica, and other silicon based substances.
Silicon tetrachloride is corrosive and toxic and reacts violently with water.
Based on the physical-chemical and toxicological properties there is no
intended use of silicon tetrachloride for consumers.
Worker risk and exposure is very unlikely as this substance must be
manufactured and handled under strictly controlled conditions in industrial
settings.
Silicon tetrachloride should not enter surface water and soil. If the risk
recommendations
are
considered,
which
are
mentioned
under
RISK
MANAGEMENT RECOMMENDATIONS,
RECOMMENDATIONS, the substance can be handled safely.
Chemical identity
Chemical name (IUPAC)
Silicon tetrachloride
Brand names
Siridion® STC
CAS number
10026-04-7
Molecular formula
SiCl4
Molecular weight
170
Structure
Si-(Cl)4
Chemical characterization
Chlorosilane
Synonyms
Tetrachlorosilane
Evonik Industries
Industries AG | GPS Safety Summary | November 2010 | Version 1 | page 1/6
Uses and application
Silicon tetrachloride is used as a raw material/intermediate in the production
of silicon, silica, and other silicon based substances. Silicon tetrachloride is
the starting material for the production of pure silicon for manufacture of
semiconductors and optical fibres. The substance is manufactured and
handled in industrial settings in closed systems.
Physical/chemical properies
Silicon tetrachloride is a clear liquid at standard temperature and pressure.
It will not self-ignite at temperatures below 650°C. It is not explosive nor is
it oxidizing. Silicon tetrachloride reacts rapidly with water.
Property
Value
Physical state
Liquid
Color
Colorless
Odor
Pungent
Density
1.48 g/cm3 at 20°C
Melting / Boiling point
-68.9°C at 1013 hPa /59°C at 101.4 kPa
Explosive Properties
No explosive properties
Self-ignition temperature
> 650°C (1010 hPa)
Vapor pressure
290 hPa at 22.5°C
Water solubility
Decomposition by hydrolysis
Flash point
N.a. inorganic
Octanol-water partition
Decomposition by hydrolysis
coefficient
Viscosity
0.52 mPa—s (dynamic), 0.35 mm2/s
(static) at 25°C
Health effects
Based on corrosivity the substance is acute toxic by oral and inhalation
exposure. Also after repeated exposure corrosive effects can occur
especially in the respiratory tract. It will cause severe skin burns and
damage to eyes. Silicon tetrachloride has not shown mutagenic or genotoxic
effects. Data show no evidence that Silicon tetrachloride is a reproductive or
developmental toxin nor is there evidence of carcinogenicity.
Evonik Industries
Industries AG | GPS Safety Summary | November 2010 | Version 1 | page 2/6
Health effects
Effect Assessment
Result
Acute toxicity (oral, dermal
based on corrosivity toxic by oral and
and inhalation)
inhalation
Eye / Skin irritation
Corrosive, causes severe skin burns and
damage to eyes.
Sensitization
not applicable, corrosive
Toxicity after repeated
Corrosive effects
exposure
Genotoxicity / mutagenicity
Not mutagenic / genotoxic
Carcinogenicity
There is no evidence of carcinogenicity
Toxicity for reproduction
There is no evidence of reproduction
toxicity
Environmental effects
Silicon tetrachloride hydrolyzes (half-life < 1 minute) to silicic acid and
hydrogen chloride. Based on available data for the hydrolysis products,
Silicon tetrachloride is considered to have a low toxicity to aquatic
organisms. As an inorganic substance tests on biodegradation are not
relevant. Based on the bioaccumulation assessment (fast hydrolysis,
formation of non persistent inorganic substances) and toxicity assessment
(not classified for long-term human health effects or for aquatic toxicity) the
substance does not meet the criteria for PBT or vPvB.
Environmental effects
Effect Assessment
Result
Aquatic toxicity
fast hydrolysis, hydrolysis products are
not toxic to water organisms
Fate and Behavior
Biodegradation
Result
Not relevant, fast hydrolysis, inorganic
substance
Bioaccumulation potential
Not relevant, fast hydrolysis, inorganic
substance
PBT / vPvB conclusion
Not considered to be either PBT or vPvB
Reactivity hazard
The substance reacts vigorously in the presence of water, including moisture
in the air. One of the products of the reaction is hydrogen chloride, which is
classified as corrosive.
Evonik Industries
Industries AG | GPS Safety Summary | November 2010 | Version 1 | page 3/6
Releases of hydrogen chloride or hydrogen vapors may over-pressurize the
container or vessel, resulting in a sudden rupture of the container or vessel.
In addition, alcohols, amines and alkalis react violently with Chlorosilanes,
generating heat.
It is important to keep the substance strictly free of water during
manufacture and storage and also prevent contact with other incompatible
materials.
Exposure
Human / Environment
All the intended uses are industrial only, and there are no downstream uses
that would result in exposure to consumers. Silicon tetrachloride is extremely
reactive and no residual unreacted starting material is present in the end
products.
Due to the corrosive and reactive nature of the substance, all aspects of
Silicon tetrachloride handling, including on-site storage and transfer, must
be subject to highly controlled conditions to minimize the potential for
exposure to worker. There is no exposure to humans from silicon
tetrachloride via the environment, as the substance is highly reactive and
unstable.
Risk management recommendations
Description
General measures
Specific Human Health risk management
measures
Specific Environment risk
management measures
Production
(i) Rigorous
(i) Local Exhaust ventilation (LEV)
(i) Use of air emission
(site specific)
containment and safe
(ii) Personal Protective Equipment (PPE):
abatement equipment
handling in line with
Gloves/ gauntlets (5-layer laminate of PE
such as incinerators and
industry best practice.
and EVOH (4H) or Butyl & Viton types
scrubbers
(ii) Procedural and
recommended; nitrile gloves may also be
(ii) Treatment of effluent
technological control
used for short durations); Full-face
in biological waste water
using Best Available
respirator with ABEK-filter; Goggles or
treatment plant.
Technique (BAT)
face shield; and Self-contained, positive
(iii)Incineration of waste
pressure breathing apparatus (for
prolonged or high exposures)
(iii) Specific workers’ training
(iv) Duration of exposure: <15 min
Monomer,
Rigorous containment
(i) Local Exhaust ventilation (LEV)
(i) Use of air emission
Chemical
and safe handling in
(ii) Personal Protective Equipment (PPE):
abatement equipment
intermediate
line with industry best
Gloves/ gauntlets (5-layer laminate of PE
such as incinerators,
and
practice.
and EVOH (4H) or Butyl & Viton types
scrubbers and fabric
Semiconducto
recommended; nitrile gloves may also be
filters is applicable as a
r Manufacture
used for short durations); Full-face
‘best practice’.
(Down stream
respirator with ABEK-filter; Goggles or
(ii) Treatment of effluent
user)
face shield and Self-contained, positive
in waste water treatment
pressure breathing apparatus (for prolong
plant.
or high exposures)
(iii) Specific workers’ training
(iv) Duration of exposure: <15 min
Evonik Industries
Industries AG | GPS Safety Summary | November 2010 | Version 1 | page 4/6
State agency review
•
EU-GHS Regulation (EU) No. 1272/2008
•
EU-Risk Assessment (Regulation 793/93)
•
IPCS International Chemical Safety Card
•
EU REACH registration 2010
•
OECD SIDS Program
Regulatory information/classification and labelling
GHSGHS-Labelling
Statutory basis
EU-GHS as per Regulation (EU) No. 1272/2008
Symbol(s)
Signal word
Danger
H301: Toxic if swallowed
H331: Toxic if inhaled
H314: Causes severe skin burns and eye
damage
EUH014: Reacts violently with water
EUH071: Corrosive to the respiratory tract
Precaution statements and more information about Silicon tetrachloride can
be found in the Safety Data Sheet.
Evonik Industries
Industries AG | GPS Safety Summary | November 2010 | Version 1 | page 5/6
This GPS Safety Summary is based on Evonik´s present knowledge and experience as of the date of
issue. However, it implies no liability or other legal responsibility on the part of Evonik, including
with regards to existing third party intellectual property rights, especially patent rights. In no event
shall Evonik be responsible for damages of any nature whatsoever resulting from the use of or
reliance upon the information herein or the chemical to which that information refers. In particular,
no warranty, whether express or implied, or guarantee in the legal sense is intended or implied by
Evonik.
This GPS Safety Summary is only intended to provide general information about the chemical
referred to herein but not any in-depth health and safety information. The information in this GPS
Safety Summary is supplied on the condition that the persons receiving the same will make their
own determination as to its suitability for their purposes prior to use. This GPS Safety Summary
does not supersede or replace required regulatory and/or legal communication documents.
Performance of the chemical described herein should be verified by testing which should be carried
out only by qualified experts.
Evonik reserves the right to make any changes to this GPS Safety Summary in accordance with
technological progress or further developments. Reference to trade names used by other
companies is neither a recommendation, nor does it imply, that similar products could not be used.
Glossary
Acute toxicity
harmful effects after a single exposure
Biodegradable
breakdown of materials by a physiological environment
Bioaccumulation
accumulation of substances in the environment
Carcinogenicity
effects causing cancer
Chronic toxicity
harmful effects after repeated exposures
GHS
Global Harmonized System on Classification and Labelling
Mutagenicity
effects that change genes
PBT
Persistent Bioaccumulative Toxic
Reprotoxicity
teratogenicity, embryotoxicity and harmful effects on fertility
Sensitizing
allergenic
Teratogenic
effects on foetal morphology
vPvB
very Persistent very Bioaccumulative
Contact information within company
Email address :
sds-im@evonik.com
Emergency Telephone number: +49 (0)7623 91-9191