Hexamethyldisiloxane MSDS

Section 1: Chemical Product and Company Identification

Product Name: Hexamethyldisiloxane

Catalog Codes: SLH2533

CAS#: 107-46-0

RTECS: JM9237000

TSCA: TSCA 8(b) inventory: Hexamethyldisiloxane

CI#: Not available.

Synonym: Disiloxane, hexamethyl-; Belsil DM 0.65;

Bis(trimethylsilyl)ether; Bis(trimethylsilyl)oxide; KF 96L;

LS-7130; Oxybis(trimethylsilane); Silane, oxybis(trimethyl-;

SWS-F 221; OS 10

Chemical Name: Hexamethyldisiloxane

Chemical Formula: C6-H18-O-Si2

Section 2: Composition and Information on Ingredients

Composition:

Name CAS # % by Weight

Hexamethyldisiloxane 107-46-0 100

Toxicological Data on Ingredients: Hexamethyldisiloxane: DERMAL (LD50): Acute: 16 ml/kg [Rabbit]. VAPOR (LC50):

Acute: 15956 ppm 4 hours [Rat].

Section 3: Hazards Identification

Potential Acute Health Effects:

Hazardous in case of skin contact (irritant), of eye contact (irritant), of ingestion, of inhalation. Severe

over-exposure can result in death.

Potential Chronic Health Effects:

CARCINOGENIC EFFECTS: Not available.

MUTAGENIC EFFECTS: Not available.

TERATOGENIC EFFECTS: Not available.

DEVELOPMENTAL TOXICITY: Not available.

Repeated exposure to a highly toxic material may produce general deterioration of health by an accumulation in

one or many human organs.

Section 4: First Aid Measures

Eye Contact:

Check for and remove any contact lenses. In case of contact, immediately flush eyes with plenty of water for at

least 15 minutes. Get medical attention.

Skin Contact:

In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated

clothing and shoes. Cover the irritated skin with an emollient. Wash clothing before reuse. Thoroughly clean

shoes before reuse. Get medical attention immediately.

Serious Skin Contact:

Wash with a disinfectant soap and cover the contaminated skin with an anti-bacterial cream. Seek immediate

medical attention.

Inhalation:

If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get

medical attention if symptoms appear.

Serious Inhalation:

Evacuate the victim to a safe area as soon as possible. Loosen tight clothing such as a collar, tie, belt or

waistband. If breathing is difficult, administer oxygen. If the victim is not breathing, perform mouth-to-mouth

resuscitation. Seek medical attention.

Ingestion:

Do NOT induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an

unconscious person. If large quantities of this material are swallowed, call a physician immediately. Loosen tight

clothing such as a collar, tie, belt or waistband.

Serious Ingestion: Not available.

Section 5: Fire and Explosion Data

Flammability of the Product: Flammable.

Auto-Ignition Temperature: Not available.

Flash Points: CLOSED CUP: -1°C (30.2°F).

Flammable Limits: LOWER: 8% UPPER: 10.3%

Products of Combustion: These products are carbon oxides (CO, CO2). Some metallic oxides, toxic fumes of silicone

oxides.

Fire Hazards in Presence of Various Substances: Highly flammable in presence of open flames and sparks, of heat.

Explosion Hazards in Presence of Various Substances:

Risks of explosion of the product in presence of mechanical impact: Not available.

Risks of explosion of the product in presence of static discharge: Not available.

Fire Fighting Media and Instructions:

Flammable liquid, insoluble in water.

SMALL FIRE: Use DRY chemical powder.

LARGE FIRE: Use water spray or fog.

Special Remarks on Fire Hazards: Danger! Extremely flammable liquid and vapor. Vapor may cause flash fire.

Special Remarks on Explosion Hazards: Not available.

Section 6: Accidental Release Measures

Small Spill: Absorb with an inert material and put the spilled material in an appropriate waste disposal.

Large Spill:

Toxic flammable liquid, insoluble or very slightly soluble in water. Poisonous liquid.

Keep away from heat. Keep away from sources of ignition. Stop leak if without risk. Absorb with DRY earth,

sand or other non-combustible material. Do not get water inside container. Do not touch spilled material. Use

water spray to reduce vapors. Prevent entry into sewers, basements or confined areas; dike if needed. Call for

assistance on disposal.

Section 7: Handling and Storage

Precautions:

Keep locked up.. Keep away from heat. Keep away from sources of ignition. Ground all equipment containing

material. Do not ingest. Do not breathe gas/fumes/ vapor/spray. Wear suitable protective clothing. In case of

insufficient ventilation, wear suitable respiratory equipment. If ingested, seek medical advice immediately and

show the container or the label. Avoid contact with skin and eyes. Keep away from incompatibles such as

oxidizing agents, acids, alkalis, moisture.

Storage:

Store in a segregated and approved area. Keep container in a cool, well-ventilated area. Keep container tightly

closed and sealed until ready for use. Avoid all possible sources of ignition (spark or flame).

Section 8: Exposure Controls/Personal Protection

Engineering Controls:

Provide exhaust ventilation or other engineering controls to keep the airborne concentrations of vapors below their

respective threshold limit value. Ensure that eyewash stations and safety showers are proximal to the

work-station location.

Personal Protection:

Splash goggles. Lab coat. Vapor respirator. Be sure to use an approved/certified respirator or equivalent.

Gloves.

Personal Protection in Case of a Large Spill:

Splash goggles. Full suit. Vapor respirator. Boots. Gloves. A self contained breathing apparatus should be

used to avoid inhalation of the product. Suggested protective clothing might not be sufficient; consult a specialist

BEFORE handling this product.

Exposure Limits: Not available.

Section 9: Physical and Chemical Properties

Physical state and appearance: Liquid.

Odor: Not available.

Taste: Not available.

Molecular Weight: 162.38 g/mole

Color: Clear Colorless.

pH (1% soln/water): Not applicable.

Boiling Point: 101°C (213.8°F)

Melting Point: -59°C (-74.2°F)

Critical Temperature: Not available.

Specific Gravity: 0.764 (Water = 1)

Vapor Pressure: 2 kPa (@ 20°C)

Vapor Density: Not available.

Volatility: Not available.

Odor Threshold: Not available.

Water/Oil Dist. Coeff.: The product is more soluble in oil; log(oil/water) = 4.2

Ionicity (in Water): Not available.

Dispersion Properties: Not available.

Solubility: Insoluble in cold water, hot water.

Section 10: Stability and Reactivity Data

Stability: The product is stable.

Instability Temperature: Not available.

Conditions of Instability:

heat, sparks, sources of ignition, and incompatible materials (strong acids, bases, and oxidizers), exposure to

moist air or water.

Incompatibility with various substances: Reactive with oxidizing agents, acids, alkalis, moisture.

Corrosivity: Not available.

Special Remarks on Reactivity: Possibly Hygroscopic. Incompatible with strong acids and strong oxidizing agents.

Special Remarks on Corrosivity: Not available.

Polymerization: Will not occur.

Section 11: Toxicological Information

Routes of Entry: Absorbed through skin. Eye contact.

Toxicity to Animals:

WARNING: THE LC50 VALUES HEREUNDER ARE ESTIMATED ON THE BASIS OF A 4-HOUR EXPOSURE.

Acute dermal toxicity (LD50): 16 ml/kg [Rabbit].

Acute toxicity of the vapor (LC50): 15956 4 hours [Rat].

Chronic Effects on Humans: Not available.

Other Toxic Effects on Humans: Hazardous in case of skin contact (irritant), of ingestion, of inhalation.

Special Remarks on Toxicity to Animals: Not available.

Special Remarks on Chronic Effects on Humans: Not available.

Special Remarks on other Toxic Effects on Humans:

Acute Potential Health Effects:

Skin: May cause skin irritation.

Eyes: May cause irritation of the eyes (cornea, and conjuctiva)

Inhalation: May cause respiratory tract irritation, causing on high concentration, especially when heated,

pulmonary edema, hemorrhage. May affect behavior (convulsions, ataxia, somnlence (general depressed

activity), nervous system, blood, metabolism endocrine system.

Ingestion: May be harmful if swallowed. May affect behavior (altered sleeptime, somnlence (general depressed

activity), liver, and urinary system.

Section 12: Ecological Information

Ecotoxicity: Not available.

BOD5 and COD: Not available.

Products of Biodegradation:

Possibly hazardous short term degradation products are not likely. However, long term degradation products may

arise.

Toxicity of the Products of Biodegradation: The products of degradation are less toxic than the product itself.

Special Remarks on the Products of Biodegradation: Resistant to biodegradation.

Section 13: Disposal Considerations

Waste Disposal:

Section 14: Transport Information

DOT Classification: CLASS 3: Flammable liquid.

Identification: : Flammable Liquid, n.o.s. (Hexamethyldisiloxane) UNNA: 1993 PG: II

Special Provisions for Transport: Not available.

Section 15: Other Regulatory Information

Federal and State Regulations:

TSCA 8(b) inventory: Hexamethyldisiloxane

TSCA 8(a) PAIR: Hexamethyldisiloxane

TSCA 8(d) H and S data reporting: Hexamethyldisiloxane: effective date: 10/12/93; Sunset date: 10/12/03

Other Regulations:

OSHA: Hazardous by definition of Hazard Communication Standard (29 CFR 1910.1200).

EINECS: This product is on the European Inventory of Existing Commercial Chemical Substances.

Other Classifications:

WHMIS (Canada):

CLASS B-2: Flammable liquid with a flash point lower than 37.8°C (100°F).

CLASS D-1A: Material causing immediate and serious toxic effects (VERY TOXIC).

DSCL (EEC):

R11- Highly flammable.

S9- Keep container in a well-ventilated place.

S16- Keep away from sources of ignition - No

smoking.

S29- Do not empty into drains.

S33- Take precautionary measures against

static discharges.

HMIS (U.S.A.):

Health Hazard: 2

Fire Hazard: 3

Reactivity: 1

Personal Protection: h

National Fire Protection Association (U.S.A.):

Health: 2

Flammability: 3

Reactivity: 2

Specific hazard:

Protective Equipment:

Gloves.

Lab coat.

Vapor respirator. Be sure to use an

approved/certified respirator or

equivalent. Wear appropriate respirator

when ventilation is inadequate.

Splash goggles.

Section 16: Other Information

References: Not available.

Other Special Considerations: Not available.

Created: 10/09/2005 05:43 PM

Last Updated: 11/06/2008 12:00 PM