Exolon Company

                                      MA T E R I A L S A FE T Y D A T A S H E E T





SECTION I.                Product Identification



PRODUCT NAME: Silicon Carbide (Metallurgical)                                                    CAS # 409-21-2

TRADE NAME(S): Exo-Sil                                                                         H.S.# 1360

CHEMICAL FORMULA: SiC                                                                         D.O.T. Name: None

MANUFACTURERS NAME:          Exolon Company

ADDRESS:                     R.R. 1, Box 200A (ESK Road)

                             Hennepin, IL 61327

EMERGENCY TELEPHONE NO.:              (815) 925-7302

TELEPHONE NO. FOR INFORMATION: (815) 925-7302

DATE PREPARED: April 7, 1989                                                        REVISED: January 1, 2002





SECTION II. Hazardous Ingredients Information



% COMP. HAZARDOUS                           CAS #                   OSHA PEL1                    ACGIH TLV2

COMPONENTS

88-92% Silicon Carbide                     409-21-2                   10 Mg/M3                    10 Mg/M3

                                                                      5 Mg/M3*

< 4% Graphite(Synthetic)                     None                     10 Mg/M3                    2 Mg/M3*

                                                                      5 Mg/M3*

< 1% Silicon (Si)                         7440-21-3                   10 Mg/M3                    10 Mg/M3

                                                                      5 Mg/M3*

< 7% Free Silica (SiO2)                   14808-60-7                 10 Mg/ M3/                  0.1 Mg/ M3

        as alpha quartz                                             (%SiO2 + 2)*









    - Occupational Safety and health Administration Final Rule Permissible exposure Limits.

1





    - American Conference of Governmental Industrial Hygienists Threshold Limit Values.

2





* - Respirable fraction: determined using industrial hygiene methods.





Material Safety Data Sheet -----Silicon Carbide

exosilmsds

                                      Sheet 1 of 4

SECTION III. Physical / Chemical Characteristics



                       Decomposes at 2210oC

     BOILING POINT:

                       Sublimes at 2000oC

     VAPOR PRESSURE: NA

     VAPOR DENSITY:    NA

     pH:               9.0 to 10.5

     SPECIFIC GRAVITY (H2O = 1): 3.17

     MELTING POINT:    See Boiling Point

     EVAPORATION RATE:         NA

     SOLUBILITY IN WATER:       Insoluble

     APPEARANCE AND ODOR: Dull grey crystal ---No odor









SECTION IV. Fire and Explosion Hazard Data





     FLASH POINT: NA   FLAMMABLE LIMITS: NA LEL: NA UEL:NA

     EXTINGUISHING MEDIA: NA

     SPECIAL FIRE FIGHTING PROCEDURES: NA

     UNUSUAL FIRE AND EXPLOSION HAZARDS: None (Material is NOT combustible.)









SECTION V. Reactivity Data





     STABILITY: Stable

     INCOMPATIBILITY: NA

     HAZARDOUS DECOMPOSITION OR BY-PRODUCTS: None

     HAZARDOUS POLYMERIZATION: Will not occur

     CONDITIONS TO AVOID: Contact of powerful oxidizers with SiO2 may cause fires.









Material Safety Data Sheet -----Silicon Carbide

exosilmsds

                                      Sheet 2 of 4

SECTION VI. Health Hazard Data





     ROUTE(S) OF ENTRY: Inhalation

     HEALTH HAZARDS:

        Acute effects: May irritate eyes, skin and upper respiratory system.

        Chronic effects: May lead to extensive fibrosis and progressive lung disease.

     CARCINOGENICITY:

          NPT: No

          IARC MONOGRAPHS: SiO2 is classified as Group 1 (Carcubigebuc to Humans)

         OSHA REGULATED: No

     SIGNS AND SYMPTOMS OF EXPOSURE: Respiratory distress, cough or shortness of breath.

     MEDICAL CONDITIONS GENERALLY AGGRAVATED BY EXPOSURE:

                                                   Any respiratory condition.



     EMERGENCY AND FIRST-AID PROCEDURES:

         Remove from area of dust exposure. If dust gets in eyes, flush immediately with large

         quantities of clean cool water.









SECTION VII. Precautions for Safe Handling and Use



     STEPS TO BE TAKEN IN CASE MATERIAL IS RELEASED OR SPILLED: Sweep, shovel

     or vacuum material. Limit exposure to dust.



     WASTE DISPOSAL METHOD: May be landfilled in accordance with state, federal and local

     regulations.



     PRECAUTIONS TO BE TAKEN IN HANDLING AND STORING: Limit generation of dust.



     OTHER PRECAUTIONS: Particles may be sharp and cause cuts and abrasions to skin and eyes.









Material Safety Data Sheet -----Silicon Carbide

exosilmsds

                                      Sheet 3 of 4

SECTION VIII. Control Measures



     RESPIRATORY PROTECTION:

          NIOSH approved dust respirator recommended for limiting exposure. Similar respiratory

          protection required at concentrations above PEL.



     VENTILATION: Local exhaust recommended.



     PROTECTIVE GLOVES: Recommended to prevent cuts and abrasions.



     EYE PROTECTION:           Recommended



     OTHER PROTECTIVE CLOTHING OR EQUIPMENT: None



     WORK/HYGIENIC PRACTICES: Minimize generation of dust.









SECTION IX. SARA Title III Reporting



     To the best of our knowledge this product does not contain any substances requiring reporting on

     the SARA, Title III, Section 313 list. (listing as of 05/92).



     ______________________________________________________________________



     The information published in this Material Safety Data Sheet has been compiled from our

     experience, and data presented in various technical publications. It is the user's responsibility to

     determine the suitability of this information for the user's application and for adopting necessary

     safety precautions.









Material Safety Data Sheet -----Silicon Carbide

exosilmsds

                                      Sheet 4 of 4