MATERIAL SAFETY DATA SHEET: MAGNESIUM FERROSILICON

I - PRODUCT IDENTIFICATION

Company's Name: POLYMET ALLOYS, INC.

Company's P. O. Box: 316

Company's City: SAGINAW

Company's State: AL

Company's Country: US

Company's Zip Code: 35137

Company's Emerg Ph #: 800-424-9300 (CHEMTREC)

Company's Info Ph #: 205-620-1266

Date MSDS Prepared: 09JAN91

Safety Data Review Date: 11OCT95

II – INGREDIENTS/IDENTITY INFORMATION

Proprietary: NO

Ingredient: MAGNESIUM

Ingredient Sequence Number: 01

Percent: 2.9-10

NIOSH (RTECS) Number: OM2100000

CAS Number: 7439-95-4

OSHA PEL: N/K (FP N)

ACGIH TLV: N/K (FP N)

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Proprietary: NO

Ingredient: SILICON

Ingredient Sequence Number: 02

Percent: 44-48

NIOSH (RTECS) Number: VW0400000

CAS Number: 7440-21-3

OSHA PEL: 10 MG/M3 TDUST

ACGIH TLV: 10 MG/M3 TDUST

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Proprietary: NO

Ingredient: CALCIUM

Ingredient Sequence Number: 03

Percent: 0.3-3.4

NIOSH (RTECS) Number: EV8040000

CAS Number: 7440-70-2

OSHA PEL: N/K (FP N)

ACGIH TLV: N/K (FP N)

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Proprietary: NO

Ingredient: CERIUM, CRUDE

Ingredient Sequence Number: 04

Percent: 0.0-2.0

NIOSH (RTECS) Number: FK4850000

CAS Number: 7440-45-1

OSHA PEL: N/K (FP N)

ACGIH TLV: N/K (FP N)

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Proprietary: NO

Ingredient: RARE EARTH

Ingredient Sequence Number: 05

Percent: 0.0-2.2

NIOSH (RTECS) Number: 1006321RE

OSHA PEL: N/K (FP N)

ACGIH TLV: N/K (FP N)

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Proprietary: NO

Ingredient: ALUMINUM (SARA III)

Ingredient Sequence Number: 06

Percent: 1.25MAX

NIOSH (RTECS) Number: BD0330000

CAS Number: 7429-90-5

OSHA PEL: 15MG/M3 DUST/5 FUME

ACGIH TLV: 10MG/M3 DUST; 9394

III - PHYSICAL DATA

Appearance And Odor: SILVER/GRAY METALLIC GRAIN-ODORLESS

Boiling Point: N/A

Melting Point: 2100F,1149C

Vapor Pressure (MM Hg/70 F): N/A

Vapor Density (Air=1): N/A

Specific Gravity: APP.4.0(H*2O=1)

Evaporation Rate And Ref: NOT APPLICABLE

Solubility In Water: INSOLUBLE

IV - FIRE AND EXPLOSION HAZARDS DATA

Flash Point: NOT APPLICABLE

Lower Explosive Limit: N/A

Upper Explosive Limit: N/A

Extinguishing Media: DRY CHEMICAL, SAND, CO*2

Special Fire Fighting Proc: NIOSH/MSHA APPROVED SCBA AND FULL PROTECTIVE

EQUIPMENT (FP N).

Unusual Fire And Expl Hazrds: FINE DUST IS FLAMMABLE

V - HEALTH HAZARD INFORMATION

LD50-LC50 Mixture: NONE SPECIFIED BY MANUFACTURER.

Route Of Entry - Inhalation: YES

Route Of Entry - Skin: NO

Route Of Entry - Ingestion: NO

Health Haz Acute And Chronic: LONGTERM EXPOSURE MAY CAUSE BENIGN

PNEUMOCONIOSIS. POSSIBLE IRRITATION OF EYES, SKIN AND LUNGS.

Carcinogenicity - NTP: NO

Carcinogenicity - IARC: NO

Carcinogenicity - OSHA: NO

Explanation Carcinogenicity: NOT RELEVANT

Signs/Symptoms Of Overexp: SEE HEALTH HAZARDS.

Med Cond Aggravated By Exp: CHRONIC RESPIRATORY CONDITIONS MAY BE

AGGRAVATED BY LONGTERM EXPOSURE.

Emergency/First Aid Proc: EYES:FLUSH WITH WATER FOR AT LEAST 15 MINUTES

(FP N). SKIN:WASH WITH SOAP AND WATER. INGEST:CALL MD IMMEDIATELY (FP N).

INHAL:REMOVE TO FRESH AIR.

VI - REACTIVITY DATA

Stability: YES

Cond To Avoid (Stability): AVOID MOISTURE

Materials To Avoid: STRONG ACIDS, ALKALIES & MOISTURE

Hazardous Decomp Products: HYDROGEN MAY EVOLVE IN PRESENCE OF H*2O

Hazardous Poly Occur: NO

Conditions To Avoid (Poly): NOT RELEVANT

VII - SPILL OR LEAK PROCEDURES

Steps If Matl Released/Spill: NORMAL CLEANUP

Neutralizing Agent: NONE SPECIFIED BY MANUFACTURER.

Waste Disposal Method: LANDFILL-ACCORDING TO LOCAL, STATE AND FEDERAL

REGULATIONS.

Precautions-Handling/Storing: KEEP DRY, DO NOT RESEAL WET MATERIAL.

Other Precautions: DO NOT MIX WET MATERIAL WITH MOLTEN METAL.

VIII - SPECIAL PROTECTION INFORMATION

Respiratory Protection: NIOSH/MSHA APPROVED RESPIRATOR RECOMMENDED FOR

NUISANCE DUST.

Ventilation: LOCAL EXHAUST RECOMMENDED.

Protective Gloves: IMPERVIOUS GLOVES (FP N).

Eye Protection: ANSI APPRVD CHEM WORKERS GOGGLES (FP N).

Other Protective Equipment: NONE

Work Hygienic Practices: NORMAL

Suppl. Safety & Health Data: NONE SPECIFIED BY MANUFACTURER.

IX - SPECIAL PRECAUTIONS

X – LABLE DATA

SPECIAL PRECAUTIONS

Label Required: YES

Technical Review Date: 31OCT94

Label Status: G

Common Name: MAGNESIUM FERROSILICON-ALL GRADES/SIZES

Chronic Hazard: YES

Signal Word: CAUTION!

Acute Health Hazard-Slight: X

Contact Hazard-Slight: X

SPECIAL PRECAUTIONS

IMPORTANT: The purpose of this sheet is to set out pertinent information which may be necessary to evaluate health, safety and environmental hazards when handling the material and to set forth safety precautions for safe handling of this material. Handling practices set forth herein are recommended minimums. Polymet Alloys, Inc. and RIMA Industrial S/A assumes no responsibility in the safe handling of the material by others and makes no representation or warranty, expressed or implied, as to completeness, accurateness, or currency of any data contained herein.