Sigma Chemical Co.      Aldrich Chemical Co., Inc. Fluka Chemical Corp.

P.O. Box 14508        1001 West St. Paul       1001 West St. Paul

St. Louis, MO 63178     Milwaukee, WI 53233        Milwaukee, WI 53233

Phone: 314-771-5765     Phone: 414-273-3850        Phone: 414-273-3850









SECTION 1. - - - - - - - - - CHEMICAL IDENTIFICATION- - - - - - - - - -

  CATALOG #:              295396

  NAME:              HYDROGEN, 99.99+%

SECTION 2. - - - - - COMPOSITION/INFORMATION ON INGREDIENTS - - - - - -

  CAS #: 1333-74-0

  MF: H2

  EC NO: 215-605-7

 SYNONYMS

  HYDROGEN (ACGIH:OSHA) * HYDROGEN, COMPRESSED (UN1049) (DOT) *

  HYDROGEN, REFRIGERATED LIQUID (CRYOGENIC LIQUID) (UN1966)

(DOT) *

  UN1049 (DOT) * UN1966 (DOT) *

SECTION 3. - - - - - - - - - - HAZARDS IDENTIFICATION - - - - - - - - -

 LABEL PRECAUTIONARY STATEMENTS

  FLAMMABLE (USA)

  EXTREMELY FLAMMABLE (EU)

  DANGER: FLAMMABLE HIGH-PRESSURE GAS.

  KEEP AWAY FROM SOURCES OF IGNITION - NO SMOKING.

  TAKE PRECAUTIONARY MEASURES AGAINST STATIC DISCHARGES.

  IN CASE OF INSUFFICIENT VENTILATION, WEAR SUITABLE

  RESPIRATORY EQUIPMENT.

  WEAR SUITABLE PROTECTIVE CLOTHING.

  CYLINDER TEMPERATURE SHOULD NOT EXCEED 125 F(52 C).

  DO NOT PUNCTURE OR INCINERATE THIS CYLINDER.

SECTION 4. - - - - - - - - - - FIRST-AID MEASURES- - - - - - - - - - -

  IF INHALED, REMOVE TO FRESH AIR. IF NOT BREATHING GIVE

ARTIFICIAL

  RESPIRATION. IF BREATHING IS DIFFICULT, GIVE OXYGEN.

  IF SWALLOWED, WASH OUT MOUTH WITH WATER PROVIDED PERSON IS

CONSCIOUS.

  CALL A PHYSICIAN.

SECTION 5. - - - - - - - - - FIRE FIGHTING MEASURES - - - - - - - - - -

 EXTINGUISHING MEDIA

  DO NOT EXTINGUISH BURNING GAS IF FLOW CANNOT BE SHUT OFF

IMMEDIATELY.

  USE WATER SPRAY OR FOG NOZZLE TO KEEP CYLINDER COOL. MOVE

CYLINDER

  AWAY FROM FIRE IF THERE IS NO RISK.

 SPECIAL FIREFIGHTING PROCEDURES

  WEAR SELF-CONTAINED BREATHING APPARATUS AND PROTECTIVE

CLOTHING TO

  PREVENT CONTACT WITH SKIN AND EYES.

  DANGER: FLAMMABLE HIGH-PRESSURE GAS.

 UNUSUAL FIRE AND EXPLOSIONS HAZARDS

  FORMS EXPLOSIVE MIXTURES IN AIR.

SECTION 6. - - - - - - - - ACCIDENTAL RELEASE MEASURES- - - - - - - - -

  EVACUATE AREA AND KEEP PERSONNEL UPWIND.

  WEAR SELF-CONTAINED BREATHING APPARATUS, RUBBER BOOTS AND

HEAVY

  RUBBER GLOVES.

  SHUT OFF LEAK IF THERE IS NO RISK.

  VENTILATE AREA AND WASH SPILL SITE AFTER MATERIAL PICKUP IS

COMPLETE.

SECTION 7. - - - - - - - - - - HANDLING AND STORAGE- - - - - - - - - - -

  REFER TO SECTION 8.

 ADDITIONAL INFORMATION

  LITHIUM, CALCIUM, BARIUM AND STRONTIUM REACT READILY IN

HYDROGEN AT

  TEMPERATURES ABOVE 300 C, SOMETIMES RESULTING IN IGNITION.

SODIUM AND

  POTASSIUM REACT MORE SLOWLY TO FORM THEIR CORRESPONDING

HYDRIDES.

  HYDROGEN MAY IGNITE OR EXPLODE ON CONTACT WITH: FLUORINE,

CHLORINE,

  BROMINE, BROMINE FLUORIDE, BROMINE TRIFLUORIDE, IODINE

HEPTAFLUORIDE,

  XENON HEXAFLUORIDE, DIFLUORODIAZENE, CHLORINE DIOXIDE,

NITROGEN OXIDE,

  DICHLORINE OXIDE, DINITROGEN OXIDE AND DINITROGEN TETROXIDE.

HEATING A

  MIXTURE OF POWDERED MAGNESIUM AND CALCIUM CARBONATE IN A

STREAM OF

  HYDROGEN CAUSED A VIOLENT EXPLOSION. MIXTURES OF HYDROGEN

AND ORGANIC

  VAPORS CAN IGNITE OR EXPLODE ON CONTACT WITH FINELY DIVIDED

RANEY

  NICKEL, PALLADIUM, PLATINUM IN THE PRESENT OF OXYGEN.

SECTION 8. - - - - - - EXPOSURE CONTROLS/PERSONAL PROTECTION- - - - - -

  CHEMICAL SAFETY GOGGLES.

  COMPATIBLE CHEMICAL-RESISTANT GLOVES.

  NIOSH/MSHA-APPROVED RESPIRATOR IN NONVENTILATED AREAS

AND/OR FOR

  EXPOSURE ABOVE THE ACGIH TLV.

  MECHANICAL EXHAUST REQUIRED.

  SAFETY SHOWER AND EYE BATH.

  USE NONSPARKING TOOLS.

  DO NOT BREATHE GAS.

  DO NOT GET IN EYES, ON SKIN, ON CLOTHING.

  AVOID PROLONGED OR REPEATED EXPOSURE.

  WASH THOROUGHLY AFTER HANDLING.

  KEEP TIGHTLY CLOSED.

  CYLINDER TEMPERATURE SHOULD NOT EXCEED 125 F(52 C).

  KEEP AWAY FROM HEAT, SPARKS, AND OPEN FLAME.

  CONTENTS UNDER PRESSURE.

  WARNING: SUCK-BACK INTO CYLINDER MAY CAUSE RUPTURE.

  USE BACK-FLOW-PREVENTIVE DEVICE IN PIPING.

  USE WITH EQUIPMENT RATED FOR CYLINDER PRESSURE, AND OF

COMPATIBLE

  MATERIALS OF CONSTRUCTION. CLOSE VALVE WHEN NOT IN USE AND

WHEN EMPTY.

  MAKE SURE CYLINDER IS PROPERLY SECURED WHEN IN USE OR

STORED.

SECTION 9. - - - - - - - PHYSICAL AND CHEMICAL PROPERTIES - - - - - - -

 APPEARANCE AND ODOR

  COLORLESS GAS

 PHYSICAL PROPERTIES

  BOILING POINT:           -252.8 C

  MELTING POINT: -259.2 C

  EXPLOSION LIMITS IN AIR:

   UPPER                          74.2%

   LOWER                           4%

  AUTOIGNITION TEMPERATURE:              1060 F    570C

  VAPOR DENSITY: .07 @ 21 C

SECTION 10. - - - - - - - - -STABILITY AND REACTIVITY - - - - - - - - -

 INCOMPATIBILITIES

  STORE AWAY FROM HEAT AND DIRECT SUNLIGHT.

  OXIDIZING AGENTS

SECTION 11. - - - - - - - - - TOXICOLOGICAL INFORMATION - - - - - - - -

 ACUTE EFFECTS

  MAY BE HARMFUL.

  EXPOSURE CAN CAUSE:

  NAUSEA, DIZZINESS AND HEADACHE

 ADDITIONAL INFORMATION

  AT HIGH CONCENTRATIONS HYDROGEN FUNCTIONS AS A SIMPLE

ASPHYXIANT BY

  DISPLACING AIR. SYMPTOMS OF EXPOSURE MAY INCLUDE HEADACHE,

FATIGUE,

  INCREASED BREATHING RATE, DIZZINESS, MUSCULAR

INCOORDINATION, NAUSEA,

  VOMITING AND LOSS OF CONSCIOUSNESS.

 RTECS #: MW8900000

  HYDROGEN

  ONLY SELECTED REGISTRY OF TOXIC EFFECTS OF CHEMICAL

SUBSTANCES

  (RTECS) DATA IS PRESENTED HERE. SEE ACTUAL ENTRY IN RTECS FOR

  COMPLETE INFORMATION.

SECTION 12. - - - - - - - - - ECOLOGICAL INFORMATION - - - - - - - - - -

  DATA NOT YET AVAILABLE.

SECTION 13. - - - - - - - - - DISPOSAL CONSIDERATIONS - - - - - - - - -

  CAUTION: NO-RETURN CYLINDER. DO NOT REUSE. EMPTY CYLINDER

WILL CONTAIN

  HAZARDOUS RESIDUE. FOLLOW PROPER DISPOSAL TECHNIQUES.

  OBSERVE ALL FEDERAL, STATE AND LOCAL ENVIRONMENTAL

REGULATIONS.

SECTION 14. - - - - - - - - - - TRANSPORT INFORMATION - - - - - - - - -

  CONTACT ALDRICH CHEMICAL COMPANY FOR TRANSPORTATION

INFORMATION.

SECTION 15. - - - - - - - - - REGULATORY INFORMATION - - - - - - - - - -

 EUROPEAN INFORMATION

  EC INDEX NO: 001-001-00-9

  EXTREMELY FLAMMABLE

  R 12

  EXTREMELY FLAMMABLE.

  S9

  KEEP CONTAINER IN A WELL-VENTILATED PLACE.

  S 16

  KEEP AWAY FROM SOURCES OF IGNITION - NO SMOKING.

  S 33

  TAKE PRECAUTIONARY MEASURES AGAINST STATIC DISCHARGES.

 REVIEWS, STANDARDS, AND REGULATIONS

  OEL=MAK

  ACGIH TLV-SIMPLE ASPHYXIANT, NO TWA               DTLVS* TLV/BEI,1996

  MSHA STANDARD:ASPHYXIANTS/GASES

   DTLWS* 3,20,1973

  OSHA PEL (CONSTRUC): SIMPLE ASPHYXIANT-INERT GASES AND

VAPORS

   CFRGBR 29,1926.55,1994

  OSHA PEL (SHIPYARD):SIMPLE ASPHYXIANTS - INERT GASES AND

VAPORS

   CFRGBR 29,1915.1000,1993

  OEL-AUSTRALIA:ASPHYXIANT JAN 1993

  OEL-BELGIUM:ASPHYXIANT JAN 1993

  OEL-HUNGARY:ASPHYXIANT JAN 1993

  OEL-THE NETHERLANDS:ASPHYXIANT JAN 1993

  OEL-SWITZERLAND:ASPHYXIANT JAN 1993

  OEL-UNITED KINGDOM:ASPHYXIANT JAN 1993

  OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA CHECK ACGIH TLV

  OEL IN NEW ZEALAND, SINGAPORE, VIETNAM CHECK ACGIH TLV

  NOHS 1974: HZD 38585; NIS 90; TNF 5607; NOS 68; TNE 49112

  NOES 1983: HZD 38585; NIS 116; TNF 8936; NOS 87; TNE 149225; TFE 15985

  EPA TSCA SECTION 8(B) CHEMICAL INVENTORY

  EPA TSCA SECTION 8(D) UNPUBLISHED HEALTH/SAFETY STUDIES

  EPA TSCA TEST SUBMISSION (TSCATS) DATA BASE, APRIL 1997

SECTION 16. - - - - - - - - - - OTHER INFORMATION- - - - - - - - - - - -

  THE ABOVE INFORMATION IS BELIEVED TO BE CORRECT BUT DOES NOT

PURPORT TO

  BE ALL INCLUSIVE AND SHALL BE USED ONLY AS A GUIDE. SIGMA,

ALDRICH,

  FLUKA SHALL NOT BE HELD LIABLE FOR ANY DAMAGE RESULTING

FROM HANDLING

  OR FROM CONTACT WITH THE ABOVE PRODUCT. SEE REVERSE SIDE OF

INVOICE OR

  PACKING SLIP FOR ADDITIONAL TERMS AND CONDITIONS OF SALE.

  COPYRIGHT 1997 SIGMA CHEMICAL CO., ALDRICH CHEMICAL CO., INC.,

  FLUKA CHEMIE AG

  LICENSE GRANTED TO MAKE UNLIMITED PAPER COPIES FOR INTERNAL

USE ONLY