hexamethyldisiloxane
CAS No.: 107-46-0
Synonyms:
Formula: C6H18OSi2
Exact Mass: 162.09000
Molecular Weight: 162.37800
PSA: 9.23000
LogP: 2.67280
hexamethyldisiloxane 107-46-0 MSDS
Name: Hexamethyldisiloxane 98+% Material Safety Data Sheet
Synonym: Bis(trimethylsilyl)ether; Bis(trimethylsilyl)oxide; Oxybis(trimethylsilane)
CAS: 107-46-0
Section 1 - Chemical Product   MSDS Name:Hexamethyldisiloxane 98+% Material Safety Data Sheet
Synonym:Bis(trimethylsilyl)ether; Bis(trimethylsilyl)oxide; Oxybis(trimethylsilane)

Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
CAS# Chemical Name content EINECS#
107-46-0 Hexamethyldisiloxane >98 203-492-7
Hazard Symbols: F
Risk Phrases: 11

Section 3 - HAZARDS IDENTIFICATION
  EMERGENCY OVERVIEW
Highly flammable.
Potential Health Effects
Eye:
Causes mild eye irritation.
Skin:
Causes mild skin irritation. Not expected to cause an allergic skin reaction.
Ingestion:
Ingestion of very large amounts may cause generalized depression, headache, and drowsiness.
Inhalation:
High vapor concentrations may cause drowsiness. May cause respiratory tract irritation.
Chronic:
Prolonged or repeated skin contact may cause defatting and dermatitis. May be harmful if ingested in large amounts.

Section 4 - FIRST AID MEASURES
  Eyes: In case of contact, immediately flush eyes with plenty of water for at least 15 minutes. Get medical aid.
Skin:
In case of contact, flush skin with plenty of water. Remove contaminated clothing and shoes. Get medical aid if irritation develops and persists. Wash clothing before reuse.
Ingestion:
If swallowed, do not induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious person. Get medical aid.
Inhalation:
If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician:

Section 5 - FIRE FIGHTING MEASURES
  General Information:
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Flammable liquid and vapor. May accumulate static electrical charges, and may cause ignition of its own vapors. Vapors are heavier than air and may travel to a source of ignition and flash back. Vapors can spread along the ground and collect in low or confined areas.
Extinguishing Media:
Use water spray or carbon dioxide.

Section 6 - ACCIDENTAL RELEASE MEASURES
  General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks:
Absorb spill with inert material (e.g. vermiculite, sand or earth), then place in suitable container. Remove all sources of ignition.
Use a spark-proof tool. Provide ventilation. Wash walking surfaces with detergent and water to reduce slipping hazard.

Section 7 - HANDLING and STORAGE
  Handling:
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Take precautionary measures against static discharges. Keep away from heat, sparks and flame. Use only with adequate ventilation. Avoid breathing vapor. When heated to temperatures above 150C in the presence of air, product can form formaldehyde vapors.
Storage:
Keep away from sources of ignition. Store in a tightly closed container. Flammables-area. Store in a cool, well-ventilated area away from incompatible substances. Storage under inert gas has been recommended.

Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION
  Engineering Controls:
Use process enclosure, local exhaust ventilation, or other engineering controls to control airborne levels below recommended exposure limits.
Exposure Limits CAS# 107-46-0: Personal Protective Equipment Eyes: Wear chemical splash goggles.
Skin:
Wear appropriate protective gloves to prevent skin exposure.
Clothing:
Wear appropriate protective clothing to prevent skin exposure.
Respirators:
Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.

Section 9 - PHYSICAL AND CHEMICAL PROPERTIES
 
Physical State: Liquid
Color: clear, colorless
Odor: odorless
pH: Not applicable.
Vapor Pressure: 44 hPa @ 20 deg C
Viscosity: 0.65 mm2/s
Boiling Point: 101 deg C @ 760 mm Hg
Freezing/Melting Point: -59 deg C
Autoignition Temperature: 340 deg C ( 644.00 deg F)
Flash Point: -3 deg C ( 26.60 deg F)
Explosion Limits, lower: 1.50%
Explosion Limits, upper: 14.65%
Decomposition Temperature:
Solubility in water: Insoluble.
Specific Gravity/Density: .76 g/ml
Molecular Formula: C6H18OSi2
Molecular Weight: 162.38

Section 10 - STABILITY AND REACTIVITY
  Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Ignition sources, excess heat.
Incompatibilities with Other Materials:
Strong oxidizing agents.
Hazardous Decomposition Products:
Carbon monoxide, carbon dioxide, silicon dioxide, formaldehyde.
Hazardous Polymerization: Will not occur.

Section 11 - TOXICOLOGICAL INFORMATION
  RTECS#:
CAS# 107-46-0: JM9237000 LD50/LC50:
CAS# 107-46-0: Draize test, rabbit, eye: 100 uL/24H Mild; Draize test, rabbit, skin: 500 mg/24H Mild; Inhalation, rat: LC50 = 15956 ppm/4H; Skin, rabbit: LD50 = 16 mL/kg.
Rat LDLo Oral: 8 ml/kg = 6.08 g/kg.
Carcinogenicity:
Hexamethyldisiloxane - Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.

Section 12 - ECOLOGICAL INFORMATION
  Other No information available.

Section 13 - DISPOSAL CONSIDERATIONS
  Dispose of in a manner consistent with federal, state, and local regulations.

Section 14 - TRANSPORT INFORMATION
 
IATA
Shipping Name: FLAMMABLE LIQUID, N.O.S.*
Hazard Class: 3
UN Number: 1993
Packing Group: II
IMO
Shipping Name: FLAMMABLE LIQUID, N.O.S.
Hazard Class: 3.2
UN Number: 1993
Packing Group: II
RID/ADR
Shipping Name: FLAMMABLE LIQUID, N.O.S.
Hazard Class: 3
UN Number: 1993
Packing group: II

Section 15 - REGULATORY INFORMATION
 
European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: F
Risk Phrases:
R 11 Highly flammable.
Safety Phrases:
S 16 Keep away from sources of ignition - No
smoking.
WGK (Water Danger/Protection)
CAS# 107-46-0: 1
Canada
CAS# 107-46-0 is listed on Canada's DSL List.
CAS# 107-46-0 is not listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 107-46-0 is listed on the TSCA inventory.


SECTION 16 - ADDITIONAL INFORMATION
N/A

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