1,1,1,3,3,3-hexamethyldisilazane

Guidance on Safe Use

First-aid measures

Description of first aid measures

General information:
Take persons to a safe place. Observe self-protection for first aid. Always seek medical advice in the event of contact with this substance.

After contact with the eyes:
Rinse immediately with plenty of water for 10-15 minutes. Keep eyelids well open to rinse the whole eye surface and eyelids with water. Seek medical advice and clearly identify substance.

After contact with the skin:
Remove contaminated clothes at once. Wash off with plenty of water or water and soap immediately for 10-15 minutes. In serious cases, use emergency shower immediately. Seek medical advice immediately and clearly identify substance.

After inhalation:
Keep the patient calm. If unconscious place in stable sideways position. Protect against loss of body heat. If breathing stops, administer artificial respiration. Seek medical advice immediately and clearly identify substance.

After swallowing:
If conscious, give several small portions of water to drink. Do not induce vomiting. Seek medical advice immediately and clearly identify substance.

Most important symptoms and effects, both acute and delayed
Any relevant information can be found in other parts of this section.

Indication of any immediate medical attention and special treatment needed
Symptoms of poisoning may not become apparent until after many hours - medical monitoring is therefore required for at least 48 hours after any accident. Further toxicology information must be observed.

Fire-fighting measures

Extinguishing media

Suitable extinguishing media:
alcohol-resistant foam , carbon dioxide , water mist , sprinkler system , sand , extinguishing powder .
Extinguishing media which must not be used for safety reasons:
water jet .

Special hazards arising from the substance or mixture
Risk of hazardous gasses or fumes in the event of fire. Exposure to combustion products may be a health hazard! Hazardous combustion products: toxic and very toxic fumes .

Advice for firefighters
Special protective equipment for fire fighting:
Use respiratory protection independent of recirculated air. Use tightly fitting chemical protection suit. Keep
unprotected persons away.

Accidental release measures

Personal precautions, protective equipment and emergency procedures

Secure the area. Wear personal protection equipment. Task force: Use tightly fitting chemical protection suit. Keep unprotected persons away. Avoid contact with eyes and skin. Do not inhale gases/vapours/aerosols. Do not walk through spilled material. Ensure adequate ventilation. If material is released indicate risk of slipping.

Environmental precautions
Prevent material from entering surface waters, drains or sewers and soil. Close leak if possible without risk. Contain any fluid that runs out using suitable material (e.g. earth). Retain contaminated water/extinguishing water. Dispose of in prescribed marked containers. Inform authorities if substance leaks into surface waters, sewerage or ground.

Methods and material for containment and cleaning up
Take up mechanically and dispose of according to local/state/federal regulations. Do not flush away with water. For small amounts: Absorb with a neutral (non-acidic / non-basic) liquid binding material such as diatomaceous earth and dispose of according to government regulations. For large amounts: Liquids may be recovered using suction devices or pumps. If flammable, only air driven or properly rated electrical equipment should be used. Clean any slippery coating that remains using a detergent / soap solution or another biodegradable cleaner. Silicone fluids are slippery; spills are a safety hazard. Apply sand or other inert granular material to improve traction.
Further information: Exhaust vapours. Eliminate all sources of ignition. Consider explosion protection. 

Reference to other sections
Relevant information in other sections has to be considered. This applies in particular for information given on personal protective equipment and on disposal.

Handling and storage

Precautions for safe handling

Precautions for safe handling:
Ensure adequate ventilation. Must be syphoned off in situ. Spilled substance increases risk of slipping. Avoid formation of aerosols. In case of aerosol formation special protective measures are required (exhausting by suction, respiratory protection). Keep away from incompatible substances.

Precautions against fire and explosion:
Flammable vapors may accumulate and form explosive mixtures with air in containers, process vessels, including partial, empty and uncleaned containers and vessels, or other enclosed spaces. Keep away from sources of ignition and do not smoke. Take precautionary measures against electrostatic charging. Cool endangered containers with water.

Conditions for safe storage, including any incompatibilities
Conditions for storage rooms and vessels:
Observe local/state/federal regulations.
Advice for storage of incompatible materials:
Observe local/state/federal regulations.
Further information for storage:
Store in a dry and cool place. Protect against moisture. Store container in a well ventilated place.
Storage class (TRGS 510): 3

Specific end use(s)
No data available.
If the annex to this safety data sheet contains exposure scenarios for end uses, the information provided therein has to be observed.

Transport information

Land transport (UN RTDG/ADR/RID)

UN number:

1992

Shipping information

Proper shipping name and description:

Entzündbarer flüssiger Stoff, giftig, n.a.g. (1,1,1,3,3,3-Hexamethyldisilazan)

Chemical name:

(1,1,1,3,3,3-Hexamethyldisilazan)

Language:

German

Class or division:

Class 3: Flammable liquids

Subsidiary hazard(s):

Class 6: Toxic and infectious substances; Division 6.1

Packing group:

Packing group II: Substances presenting medium danger

SpecialProvisions

Inland waterway transport (UN RTDG/ADN(R))

UN number:

1992

Shipping information

Proper shipping name and description:

Entzündbarer flüssiger Stoff, giftig, n.a.g. (1,1,1,3,3,3-Hexamethyldisilazan)

Chemical name:

(1,1,1,3,3,3-Hexamethyldisilazan)

Language:

German

Class or division:

Class 3: Flammable liquids

Subsidiary hazard(s):

Class 6: Toxic and infectious substances; Division 6.1

Packing group:

Packing group II: Substances presenting medium danger

Remarks

Marine transport (UN RTDG/IMDG)

UN number:

1992

Shipping information

Proper shipping name and description:

Flammable liquid, toxic, n.o.s. (1,1,1,3,3,3-Hexamethyldisilazane)

Chemical name:

(1,1,1,3,3,3-Hexamethyldisilazane)

Language:

English

Class or division:

Class 3: Flammable liquids

Subsidiary hazard(s):

Class 6: Toxic and infectious substances; Division 6.1

Packing group:

Packing group II: Substances presenting medium danger

Remarks

Air transport (UN RTDG/ICAO/IATA)

UN number:

1992

Shipping information

Proper shipping name and description:

Flammable liquid, toxic, n.o.s. (1,1,1,3,3,3-Hexamethyldisilazane)

Chemical name:

(1,1,1,3,3,3-Hexamethyldisilazane)

Language:

English

Class or division:

Class 3: Flammable liquids

Subsidiary hazard(s):

Class 6: Toxic and infectious substances; Division 6.1

Packing group:

Packing group II: Substances presenting medium danger

Remarks

SpecialProvisions

Exposure controls / personal protection

Anhydrous ammonia   AGW    14,0 mg/m3     20,0 ppm
Anhydrous ammonia    EU      14,0 mg/m3     20,0 ppm
Aerosol - inhalable fraction     10,0 mg/m3

Exposure controls

Exposure in the work place limited and controlled

General protection and hygiene measures:
Avoid exposure - obtain special instructions before use. Observe standard industrial hygiene practices for the handling of chemical substances. Avoid contact with eyes and skin. Do not inhale gases/vapours/aerosols. Use with adequate ventilation.
Preventive skin protection recommended. Remove contaminated, soaked clothing immediately. Clean work areas regularly.
Provide emergency shower and eye-bath. Do not eat, drink or smoke when handling. Keep away from foodstuff, drink and feedingstuff.

Further information for system design and engineering measures
Observe national regulatory requirements.

Personal protection equipment:
Respiratory protection

If inhalative exposure above the occupational exposure limit cannot be excluded, adequate respiratory protection equipment must be used. Suitable respiratory equipment: Respirator with a full face mask, according to acknowledged standards such as EN 136.
Recommended Filter type: Gas filter type ABEK (certain inorganic, organic and acidic gases and vapors; ammonia/amines), according to acknowledged standards such as EN 14387
In case of mist, spray or aerosol exposure wear suitable personal respiratory protection and protective suit. Suitable respiratory equipment: Respirator with a full face mask, according to acknowledged standards such as EN 136.
Recommended Filter type: Combined filter type ABEK-P2 (certain inorganic, organic and acidic gases and vapors;
ammonia/amines; particles), according to acknowledged standards such as EN 14387
For long or intense exposure, use respiratory protective equipment. Suitable respiratory equipment: Positive pressure self contained breathing apparatus, according to acknowledged standards such as EN 137.
Observe the equipment manufacturer's information and wear time limits for respirators.
Eye protection tight fitting protective goggles . Where there is risk of splashing: protective shield .

Hand protection
Protective gloves are required at all times when handling the material, according to recognized standards such as EN374.
Recommended glove types: Protective gloves made of butyl rubber
thickness of the material: > 0,3 mm
Breakthrough time: > 480 min
Recommended glove types: Protective gloves made of nitrile rubber
thickness of the material: > 0,4 mm
Breakthrough time: 10 - 30 min
Please observe the instructions regarding permeability and breakthrough time which are provided by the supplier of the gloves.
Also take into consideration the specific local conditions under which the product is used, such as the danger of cuts, abrasion, and the contact time.
Skin protection
If handled uncovered: Chemical protective clothing, full-body liquid-tight protection if necessary. Please observe the instructions regarding permeability time which are provided by the supplier.

Exposure to the environment limited and controlled
Prevent material from entering surface waters, drains or sewers and soil. Normally neutralisation is required before waste water is introduced into purification plants. Do not introduce large amounts into purification plants.

Stability and reactivity

Reactivity; Chemical stability; Possibility of hazardous reactions

If stored and handled in accordance with standard industrial practices no hazardous reactions are known.
Relevant information can possibly be found in other parts of this section.

Conditions to avoid
Moisture, heat, open flames, and other sources of ignition.

Incompatible materials
Reacts with water. The reaction takes place with the formation of ammonia.

Hazardous decomposition products
By hydrolysis: ammonia.

Disposal considerations

Waste treatment methods

Material Recommendation:
Material that cannot be used, reprocessed or recycled should be disposed of in accordance with Federal, State, and local regulations at an approved facility. Depending on the regulations, waste treatment methods may include, e.g., landfill or incineration.

Uncleaned packaging
Recommendation:
Completely discharge containers (no tear drops, no powder rest, scraped carefully). Containers may be recycled or re-used. Observe local/state/federal regulations. Uncleaned packaging should be treated with the same precautions as the material.

Waste Disposal Legislation Ref.No.(EC)
It is not possible to determine a waste code for this product in accordance with the European Waste Catalogue (EWC) since it is only possible to classify it according to how it is used by the customer. The waste code is to be determined within the EU in liaison with the waste-disposal operator.