SIGMA CHEMICAL COMPANY -- A7250 N-ACETYL-L-CYSTEINE SIGMA GRADE  -- 6550-00F051169
<pre>=====================  Product Identification  =====================

Product ID:A7250 N-ACETYL-L-CYSTEINE SIGMA GRADE
MSDS Date:04/15/1996
FSC:6550
NIIN:00F051169
=== Responsible Party ===
Company Name:SIGMA CHEMICAL COMPANY
Address:3050 SPRUCE ST
Box:14508
City:SAINT LOUIS
State:MO
ZIP:63178-5000
Country:US
Info Phone Num:314-771-5765/800-325-3010
Emergency Phone Num:314-771-5765/800-325-3010
CAGE:21076
=== Contractor Identification ===
Company Name:SIGMA CHEMICAL COMPANY
Address:3050 SPRUCE ST
Box:14508
City:ST LOUIS
State:MO
ZIP:63178
Country:US
Phone:314-771-5765
CAGE:21076

=============  Composition/Information on Ingredients  =============

Ingred Name:N-ACETYL-L-CYSTEINE, ACETYLCYSTEINE
CAS:616-91-1
RTECS #:HA1660000

=====================  Hazards Identification  =====================

LD50 LC50 Mixture:ORAL LD50(RAT): 5050 MG/KG CYSTEINE
Routes of Entry: Inhalation:YES  Skin:YES  Ingestion:YES
Reports of Carcinogenicity:NTP:NO    IARC:NO	OSHA:NO
Health Hazards Acute and Chronic:MAY BE HARMFUL BY INHALATION,
    INGESTION/SKIN ABSORPTION, EXPOSURE CAN CAUSE BRONCHOSPASM.
Explanation of Carcinogenicity:NONE
Effects of Overexposure:NAUSEA, VOMITING, STOMATITIS, NASAL DISCHARGE.

=======================  First Aid Measures  =======================

First Aid:INGESTION: WASH OUT MOUTH W/WATER IF CONSCIOUS. SKIN: FLUSH
    W/COPIOUS AMOUNTS OF WATER FOR 15 MINS. INHALATION: REMOVE TO FRESH
    AIR. EYES: FLUSH W/COPIOUS AMOUNTS OF WATER FOR 15 MINS. OBTAIN
    MEDICAL  ATTENTION IN ALL CASES.

=====================  Fire Fighting Measures  =====================

Extinguishing Media:WATER SPRAY, CO2, DRY CHEMICAL POWDER/APPROPRIATE
    FOAM.
Fire Fighting Procedures:WEAR SCBA & PROTECTIVE CLOTHING.
Unusual Fire/Explosion Hazard:EMITS TOXIC FUMES UNDER FIRE CONDITIONS.

==================  Accidental Release Measures  ==================

Spill Release Procedures:WEAR PROTECTIVE EQUIPMENT. SWEEP UP, PLACE IN
    A BAG & HOLD FOR WASTE DISPOSAL. AVOID RAISING DUST. VENTILATE AREA
    & WASH SITE AFTER MATERIAL PICKUP IS COMPLETE.

======================	Handling and Storage  ======================

Handling and Storage Precautions:AVOID CONTACT & INHALATION.
Other Precautions:PREVENT CONTACT W/SKIN & EYES.

=============  Exposure Controls/Personal Protection  =============

Respiratory Protection:WEAR APPROPRIATE NIOSH/MSHA APPROVED RESPIRATOR.
Ventilation:MECHANICAL EXHAUST REQUIRED.
Protective Gloves:CHEMICAL RESISTANT
Eye Protection:SAFETY GOGGLES
Other Protective Equipment:PROTECTIVE CLOTHING.
Work Hygienic Practices:REMOVE/LAUNDER CONTAMINATED CLOTHING & SHOES
    BEFORE REUSE.
Supplemental Safety and Health
MELTING POINT: 228.2-231.8F.

==================  Physical/Chemical Properties  ==================

Melt/Freeze Pt:M.P/F.P Text:(SEE SUPP)
Appearance and Odor:WHITE CRYSTALS

=================  Stability and Reactivity Data  =================

Stability Indicator/Materials to Avoid:YES
HEAVY METALS, HEAVY METAL SALTS, RUBBER, OXYGEN, OXIDIZING AGENTS.
Hazardous Decomposition Products:COMBUSTION: CO, CO2, NITROGEN OXIDES,
    SULFUR OXIDES.

====================  Disposal Considerations  ====================

Waste Disposal Methods:DISSOLVE/MIX MATERIAL W/A COMBUSTIBLE SOLVENT &
    BURN IN A CHEMICAL INCINERATOR EQUIPPED W/AN AFTERBURNER &
    SCRUBBER, IAW/FEDERAL, STATE & LOCAL REGULATIONS.

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 of Defense.  The United States of America in no manner whatsoever,
 expressly or implied, warrants this information to be accurate and
 disclaims all liability for its use.  Any person utilizing this
 document should seek competent professional advice to verify and
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 particular situation.