octamethylcyclotetrasiloxane
CAS No.: 556-67-2 Formula: C8H24O4Si4 Molecular Weight: 296.61600
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octamethylcyclotetrasiloxane

CAS No.: 556-67-2 Formula: C8H24O4Si4 Molecular Weight: 296.61600
Suppliers: All (115) China Suppliers (76) Price Available (14) Contractor (5)

Description

Octamethylcyclotetrasiloxane, also called D4, is an organosilicon compound with the formula [(CH3)2SiO]4. lt is a colorless viscous liquid. It is a common cyclomethicone. Like other cyclomethicones, it is slightly volatile. It has attracted scrutiny because it is pervasive in the environment.

Basic Info

Chemical Name octamethylcyclotetrasiloxane
Synonyms

Octamethylcyclotetrasiloxane; Cyclotetrasiloxane, octamethyl-; 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane;

CAS No. 556-67-2
Molecular Formula C8H24O4Si4
Molecular Weight 296.61600
PSA 36.92000
LogP 2.87360

Numbering system

UNII CZ227117JE

Properties

Appearance & Physical State Colorless clear liquid
Density 0.956
Boiling Point 175-176ºC
Melting Point 17-18ºC
Flash Point 56ºC
Refractive Index 1.395-1.397
Water Solubility INSOLUBLE
Storage Condition 2-8ºC
Vapor Density 1 (vs air)

Safety Info

RTECS GZ4397000
Hazard Class 3
Safety Statements S36/37-S46-S51-S61
Packing Group III
WGK Germany 1
RIDADR UN 1993
Risk Statements R53; R62
Hazard Codes Xn
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SDS 1.0

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SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017

1.Identification

1.1 GHS Product identifier

Product name octamethylcyclotetrasiloxane

1.2 Other means of identification

Product number -
Other names Cyclotetrasiloxane, octamethyl-

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Adhesives and sealant chemicals,CBI,Finishing agents,Intermediates,Solvents (which become part of product formulation or mixture)
Uses advised against no data available

1.4 Supplier's details

Company MOLBASE (Shanghai) Biotechnology Co., Ltd.
Address Floor 4 & 5, Building 12, No. 1001 North Qinzhou Road,
Xuhui District, Shanghai, China
Telephone +86(21)64956998
Fax +86(21)54365166

1.5 Emergency phone number

Emergency phone number +86-400-6021-666
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

2.Hazard identification

2.1 Classification of the substance or mixture

Hazardous to the aquatic environment, long-term (Chronic) - Category Chronic 4

Reproductive toxicity, Category 2

2.2 GHS label elements, including precautionary statements

Pictogram(s)
Signal word

Warning

Hazard statement(s)

H413 May cause long lasting harmful effects to aquatic life

Precautionary statement(s)
Prevention

P273 Avoid release to the environment.

P201 Obtain special instructions before use.

P202 Do not handle until all safety precautions have been read and understood.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

Response

P308+P313 IF exposed or concerned: Get medical advice/ attention.

Storage

P405 Store locked up.

Disposal

P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification

none

3.Composition/information on ingredients

3.1 Substances

Chemical name Common names and synonyms CAS number EC number Concentration
octamethylcyclotetrasiloxane octamethylcyclotetrasiloxane 556-67-2 none 100%

4.First-aid measures

4.1 Description of necessary first-aid measures

General advice

Consult a physician. Show this safety data sheet to the doctor in attendance.

If inhaled

Fresh air, rest.

In case of skin contact

Remove contaminated clothes. Rinse and then wash skin with water and soap.

In case of eye contact

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

If swallowed

Rinse mouth. Do NOT induce vomiting. Refer for medical attention .

4.2 Most important symptoms/effects, acute and delayed

no data available

4.3 Indication of immediate medical attention and special treatment needed, if necessary

/SRP:/ Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR if necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on the left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Poisons A and B/

5.Fire-fighting measures

5.1 Extinguishing media

Suitable extinguishing media

Suitable extinguishing media: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.

5.2 Specific hazards arising from the chemical

no data available

5.3 Special protective actions for fire-fighters

Wear self-contained breathing apparatus for firefighting if necessary.

6.Accidental release measures

6.1 Personal precautions, protective equipment and emergency procedures

Use personal protective equipment. Avoid dust formation. Avoid breathing vapours, mist or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Avoid breathing dust. For personal protection see section 8.

6.2 Environmental precautions

Collect leaking and spilled liquid in covered containers as far as possible.

6.3 Methods and materials for containment and cleaning up

ACCIDENTAL RELEASE MEASURES: Personal precautions, protective equipment and emergency procedures: Use personal protective equipment. Avoid breathing vapors, mist or gas. Ensure adequate ventilation. Remove all sources of ignition. Evacuate personnel to safe areas. Beware of vapors accumulating to form explosive concentrations. Vapors can accumulate in low areas.; Environmental precautions: Prevent further leakage or spillage if safe to do so. Do not let product enter drains. Discharge into the environment must be avoided.; Methods and materials for containment and cleaning up: Contain spillage, and then collect with an electrically protected vacuum cleaner or by wet-brushing and place in container for disposal according to local regulations.

7.Handling and storage

7.1 Precautions for safe handling

Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Avoid exposure - obtain special instructions before use.Provide appropriate exhaust ventilation at places where dust is formed. For precautions see section 2.2.

7.2 Conditions for safe storage, including any incompatibilities

Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. Storage class (TRGS 510): Flammable liquids.

8.Exposure controls/personal protection

8.1 Control parameters

Occupational Exposure limit values

no data available

Biological limit values

no data available

8.2 Appropriate engineering controls

Handle in accordance with good industrial hygiene and safety practice. Wash hands before breaks and at the end of workday.

8.3 Individual protection measures, such as personal protective equipment (PPE)

Eye/face protection

Safety glasses with side-shields conforming to EN166. Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).

Skin protection

Wear impervious clothing. The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace. Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique(without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands. The selected protective gloves have to satisfy the specifications of EU Directive 89/686/EEC and the standard EN 374 derived from it.

Respiratory protection

Wear dust mask when handling large quantities.

Thermal hazards

no data available

9.Physical and chemical properties

Physical state Colorless clear liquid
Colour Oily liquid
Odour no data available
Melting point/ freezing point 19°C(lit.)
Boiling point or initial boiling point and boiling range 175°C
Flammability Flammable.
Lower and upper explosion limit / flammability limit no data available
Flash point 54°C(lit.)
Auto-ignition temperature no data available
Decomposition temperature no data available
pH no data available
Kinematic viscosity 2.30 cSt at 25°C
Solubility In water:INSOLUBLE
Partition coefficient n-octanol/water (log value) log Kow = 6.74 (average of 3 measurements)
Vapour pressure 1.05 mm Hg at 25°C
Density and/or relative density 0.956
Relative vapour density 1 (vs air)
Particle characteristics no data available

10.Stability and reactivity

10.1 Reactivity

no data available

10.2 Chemical stability

Stable under recommended storage conditions.

10.3 Possibility of hazardous reactions

no data available

10.4 Conditions to avoid

no data available

10.5 Incompatible materials

Incompatible materials: Strong oxidizing agents, acids, bases.

10.6 Hazardous decomposition products

When heated to decomposition it emits acrid smoke and irritating vapors.

11.Toxicological information

Acute toxicity

  • Oral: no data available
  • Inhalation: no data available
  • Dermal: no data available

Skin corrosion/irritation

no data available

Serious eye damage/irritation

no data available

Respiratory or skin sensitization

no data available

Germ cell mutagenicity

no data available

Carcinogenicity

no data available

Reproductive toxicity

no data available

STOT-single exposure

no data available

STOT-repeated exposure

no data available

Aspiration hazard

no data available

12.Ecological information

12.1 Toxicity

  • Toxicity to fish: LC50; Species: Oncorhynchus mykiss (Rainbow trout); Conditions: flow through; Concentration: 10 ug/L for 14 days (95% confidecne limit: 8.5-13 ug/L); flow through
  • Toxicity to daphnia and other aquatic invertebrates: no data available
  • Toxicity to algae: no data available
  • Toxicity to microorganisms: no data available

12.2 Persistence and degradability

AEROBIC: Dimethyl siloxanes, in general, are highly resistant to biodegradation(1). Octamethylcyclotetrasiloxane, at 30 ug/L, had 0% biodegradation when incubated with water/sediment under aerobic conditions for 42 days(2). Using OECD Guideline 310 (Ready Biodegradability - CO2 in Sealed Vessels, Headspace Test) and an activated sewage sludge inoculum, octamethylcyclotetrasiloxane, at 10 mg/L, reached only 3.7% of its theoretical CO2 evolution in 29 days(2). Using OECD Guideline 308 (Aerobic and Anaerobic Transformation in Aquatic Sediment Systems), octamethylcyclotetrasiloxane had an aerobic sediment half-life of 242 days at 24°C(1).

12.3 Bioaccumulative potential

A steady-state BCF of 12,400 and a kinetic BCF of 13,400 were measured for octamethylcyclotetrasiloxane using fathead minnows (Pimephales promelas) which were exposed to a concentration of 0.5 ug/L of octamethylcyclotetrasiloxane for approximately 28 days(1). A steady-state BCF of 3,000-4,000 and a kinetic BCF of 4,100-5,500 were reported for octamethylcyclotetrasiloxane using common carp (Cyprinus carpio)(1). According to a classification scheme(2), this BCF suggests that bioconcentration in aquatic organisms is very high(SRC).

12.4 Mobility in soil

Adsorption studies using three soils from the United Kingdom (silt loam, sandy loam and sandy clay loam) determined octamethylcyclotetrasiloxane log Koc values of 4.17-4.27 with an average log Koc of 4.22 (Koc of 16600)(1). According to a classification scheme(2), these Koc values suggest that octamethylcyclotetrasiloxane is expected to be immobile in soil.

12.5 Other adverse effects

no data available

13.Disposal considerations

13.1 Disposal methods

Product

The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.

Contaminated packaging

Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.

14.Transport information

14.1 UN Number

ADR/RID: UN1992 IMDG: UN1992 IATA: UN1992

14.2 UN Proper Shipping Name

ADR/RID: FLAMMABLE LIQUID, TOXIC, N.O.S.
IMDG: FLAMMABLE LIQUID, TOXIC, N.O.S.
IATA: FLAMMABLE LIQUID, TOXIC, N.O.S.

14.3 Transport hazard class(es)

ADR/RID: 3 IMDG: 3 IATA: 3

14.4 Packing group, if applicable

ADR/RID: III IMDG: III IATA: III

14.5 Environmental hazards

ADR/RID: no IMDG: no IATA: no

14.6 Special precautions for user

no data available

14.7 Transport in bulk according to Annex II of MARPOL 73/78 and the IBC Code

no data available

15.Regulatory information

15.1 Safety, health and environmental regulations specific for the product in question

Chemical name Common names and synonyms CAS number EC number
octamethylcyclotetrasiloxane octamethylcyclotetrasiloxane 556-67-2 none
European Inventory of Existing Commercial Chemical Substances (EINECS) Listed.
EC Inventory Listed.
United States Toxic Substances Control Act (TSCA) Inventory Listed.
China Catalog of Hazardous chemicals 2015 Not Listed.
New Zealand Inventory of Chemicals (NZIoC) Listed.
Philippines Inventory of Chemicals and Chemical Substances (PICCS) Listed.
Vietnam National Chemical Inventory Listed.
Chinese Chemical Inventory of Existing Chemical Substances (China IECSC) Listed.

16.Other information

Information on revision

Creation Date Aug 12, 2017
Revision Date Aug 12, 2017

Abbreviations and acronyms

  • CAS: Chemical Abstracts Service
  • ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
  • RID: Regulation concerning the International Carriage of Dangerous Goods by Rail
  • IMDG: International Maritime Dangerous Goods
  • IATA: International Air Transportation Association
  • TWA: Time Weighted Average
  • STEL: Short term exposure limit
  • LC50: Lethal Concentration 50%
  • LD50: Lethal Dose 50%
  • EC50: Effective Concentration 50%

References

  • IPCS - The International Chemical Safety Cards (ICSC), website: http://www.ilo.org/dyn/icsc/showcard.home
  • HSDB - Hazardous Substances Data Bank, website: https://toxnet.nlm.nih.gov/newtoxnet/hsdb.htm
  • IARC - International Agency for Research on Cancer, website: http://www.iarc.fr/
  • eChemPortal - The Global Portal to Information on Chemical Substances by OECD, website: http://www.echemportal.org/echemportal/index?pageID=0&request_locale=en
  • CAMEO Chemicals, website: http://cameochemicals.noaa.gov/search/simple
  • ChemIDplus, website: http://chem.sis.nlm.nih.gov/chemidplus/chemidlite.jsp
  • ERG - Emergency Response Guidebook by U.S. Department of Transportation, website: http://www.phmsa.dot.gov/hazmat/library/erg
  • Germany GESTIS-database on hazard substance, website: http://www.dguv.de/ifa/gestis/gestis-stoffdatenbank/index-2.jsp
  • ECHA - European Chemicals Agency, website: https://echa.europa.eu/

Disclaimer: The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. We as supplier shall not be held liable for any damage resulting from handling or from contact with the above product.
MSDS Expand
1H NMR : parameter in CDCl3Expand

NMR Spectrum 1H NMR : parameter in CDCl3

Collapse

C8 H24 O4 Si4 0.05 ml : 0.5 ml CDCl3
octamethylcyclotetrasiloxane

Parameter ppm Hz
D(A) 0.091

J(A,Si-29) = 3.6 Hz.

IR : liquid filmExpand
Mass Expand

GC Analysis

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