Technical information GPS Safety SummaryGPS Safety Summary
Silicon tetrachloride SSSubstance nameSubstance nameubstance name Silicon tetrachloride CAS No. 10026 04 7
General statementGeneral 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 RECOMMENDATIONSMANAGEMENT RECOMMENDATIONS,,,, the substance can be handled safely. Chemical identityChemical identity
Chemical name (IUPAC) Silicon tetrachloride Brand names Siridion® STC CAS number 10026 04 7
Molecular formula SiCl 4 Molecular weight 170
Structure Si (Cl) 4 Chemical characterization Chlorosilane Synonyms Tetrachlorosilane
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Uses and applicationUses 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 properiesPhysical/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/cm 3 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 mPas (dynamic), 0.35 mm 2/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.
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Health effectsHealth 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 Environmental effectseffectseffects
Effect Assessment Result Aquatic toxicity fast hydrolysis, hydrolysis products are not toxic to water organisms Fate and Behavior Result Biodegradation 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 hazardReactivity 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.
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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.
ExposureExposure
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
DescriptionDescription General measuresGeneral measures Specific Specific Human Health risk management Human Health risk management Specific Environment risk measuresmeasures management measuresmanagement 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
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State agency reviewState 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 LabellingLabellingLabelling
Statutory basis EU GHS as per Regulation (EU) No. 1272/2008 Symbol(s)
Signal word DangerDanger H301: Toxic if swallowedH301: Toxic if swallowed H331: Toxic if inhaledH331: Toxic if inhaled H314: Causes severe skin burns and eyeH314: Causes severe skin burns and eye damage damage
EUH014: Reacts violently with waterEUH014: Reacts violently with water EUH071: Corrosive to the respiratory tractEUH071: Corrosive to the respiratory tract Precaution statements and more information about Silicon tetrachloride can be found in the Safety Data Sheet.
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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.
GlossaryGlossary 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
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