=====================  Product Identification  =====================

MSDS NAME:N-ACETYL-L-CYSTEINE SIGMA GRADE, A7250
NIIN:01-373-3540
Status Code:A
MSDS Number: CJQPM
=== Responsible Party ===
Company:SIGMA CHEMICAL CO
Box:14508
City:ST LOUIS
State:MO
ZIP:63178
Country:US
Info Phone Num:314-771-5765
Emergency Phone Num:314-771-5765
CAGE:21076
=== Contractor Identification ===
Company: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  =============

Name:N-ACETYL-L-CYSTEINE. LD50:(ORAL,RAT) 5050 MG/KG.
CAS:616-91-1
RTECS #:HA1660000

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

LD50 LC50 Mixture:SEE INGREDIENTS & TOX INFORMATION.
Routes of Entry: Inhalation:YES  Skin:YES  Ingestion:YES
Reports of Carcinogenicity:NTP:NO    IARC:NO	OSHA:NO
Health Hazards Acute and Chronic:ACUTE: MAY BE HARMFUL BY INHALATION,
    INGESTION OR SKIN ABSORPTION. EXPOSURE CAN CAUSE BRONCHOSPASM,
    NAUSEA, VOMITING, STOMATITIS, AND NASAL DISCHARGE. TARGET ORGAN
    DATA: GASTROINTESTINAL (OTHER CHANGE S).
Effects of Overexposure:SEE HEALTH HAZARDS.

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

First Aid:INGESTION: WASH OUT MOUTH WITH WATER PROVIDED PERSON IS
    CONSCIOUS. CALL MD. SKIN: FLUSH WITH COPIOUS AMOUNTS OF WATER FOR
    AT LEAST 15 MINUTES. REMOVE CONTAMINATED CLOTHING AND SHOES. CALL
    MD. INHALATI ON: REMOVE TO FRESH AIR. IF BREATHING BECOMES
    DIFFICULT, CALL MD. EYES: FLUSH WITH COPIOUS AMOUNTS OF WATER FOR
    AT LEAST 15 MINUTES. ASSURE ADEQUATE FLUSHING BY SEPARATING EYELIDS
    WITH FINGERS. CALL M D.

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

Extinguishing Media:WATER SPRAY, CARBON DIOXIDE, DRY CHEMICAL POWDER OR
    APPROPRIATE FOAM.
Fire Fighting Procedures:USE NIOSH APPROVED SCBA AND FULL PROTECTIVE
    EQUIPMENT .
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 AND HOLD FOR WASTE DISPOSAL. AVOID RAISING DUST. VENTILATE
    AREA AND WASH SPILL SITE AFTER MATERIAL PICKUP IS COMPLETE.

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

Handling and Storage Precautions:CAUTION: AVOID CONTACT AND INHALATION.

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

Respiratory Protection:WEAR APPROPRIATE NIOSH APPROVED RESPIRATOR.
Ventilation:MECHANICAL EXHAUST REQUIRED.
Protective Gloves:CHEMICAL-RESISTANT GLOVES.
Eye Protection:ANSI APPROVED CHEMICAL WORKERS GOGGLES .
Other Protective Equipment:ANSI APPROVED EYE WASH & DELUGE SHOWER .
    WEAR OTHER PROTECTIVE CLOTHING.
Supplemental Safety and Health

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

Melt/Freeze Pt:>109.C, 228.2F
M.P/F.P Text:109-111C
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:TOXIC FUMES OF: CARBON MONOXIDE,
    CARBON DIOXIDE, NITROGEN OXIDES, SULFUR OXIDES.
Conditions to Avoid Polymerization:WILL NOT OCCUR.

===================  Toxicological Information	===================

Toxicological Information:TOX DATA: LD50:(ORAL,RAT) 5050 MG/KG - TXAPA9
    18,185,1971. LD50:(IVN,RAT) 1140 MG/KG - EJRDD2 61 (SUPPL
    111),45,1980. LD50:(ORAL,MUS) 4400 MG/KG - EPXXDW #0192191.
    LD50:(IPR,MUS) 400 MG/KG - NTIS** AD 691-490. LD50:(IVN,MUS) 3800
    MG/KG - JMCMAR 10,1172,1967. LD50:(ORAL,DOG) >1 GM/KG - PBPSDY
    2,479,1979. LD50:(IPR,DOG) 700 MG/KG - PBPSDY 2,479,1979.
    LD50:(IVN,DOG) 700 MG/KG - PBPSDY 2,479,1979. ONLY	SELECTED
    REGISTRY OF TOXIC EFFECTS OF CHEMICAL SUBSTANCES (RTECS) DATA IS
    PRESENTED HERE. SEE ACTUAL ENTRY IN RTECS FOR COMPLETE INFORMATION.

=====================  Ecological Information  =====================

Ecological:DATA NOT YET AVAILABLE.

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

Waste Disposal Methods:DISSOLVE OR MIX THE MATERIAL WITH A COMBUSTIBLE
    SOLVENT AND BURN IN A CHEMICAL INCINERATOR EQUIPPED WITH AN
    AFTERBURNER AND SCRUBBER. OBSERVE ALL FEDERAL, STATE AND LOCAL
    ENVIRONMENTAL REGULATIONS.

===================  MSDS Transport Information  ===================

Transport Information:CONTACT SIGMA CHEMICAL COMPANY FOR TRANSPORTATION
    INFORMATION.

=====================  Regulatory Information  =====================

Federal Regulatory Information:REVIEWS, STANDARDS AND REGULATIONS:
    OEL=MAK. NOHS 1974: HZD 81688; NIS 1; TNF 616; NOS 6; TNE 4525.
    NOES 1983: HZD 81688; NIS 1; TNF 1677; NOS 14; TNE 31203; TFE
    21201. EPA TSCA SECTION 8(B) CHEMICAL  INVENTORY.

=======================  Other Information  =======================

 Disclaimer (provided with this information by the compiling agencies):
 This information is formulated for use by elements of the Department
 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
 assume responsibility for the suitability of this information to their
 particular situation.

*** END OF RECORD ***