STEELMAKING SLAG

MATERIAL SAFETY DATA SHEET



SECTION I - MATERIAL IDENTIFICATION



Manufacturer's Name                                            Emergency Telephone Number

        Gerdau AmeriSteel                                             813/286-8383

Contact                                                        Telephone Number for Information

        Matt D. Moore                                                 813/286-8383

        Director, Safety & Health

Address

        P. O. Box 31328                                        CAS NO.

        Tampa, FL 33631-3328                                          65996-71-6

Product                                                        Chemical Name

        Steelmaking Slag                                              Calcium Silicates and Ferrites







SECTION II - INGREDIENTS AND HAZARDS



                                                                         Exposure Limits

                                                            OSHA PEL (mg/m3)             ACGIH TLV (mg/m3)

Composition        CAS NO.            % WT



CaO                1305-78-8          23-30                          5                                     5

SiO2               14808-60-7         7-29               10/%-SiO2 +2 Resp. Dust                   0.1 Resp. Fraction

                                                         30/%-SiO2 +2 Total Dust

Fe203              1309-37-1          1-46                          10                                5 as fume

MgO                1309-48-4          5-21                 5 Respirable Fraction                     10 as fume

S                  7704-34-9          <.1                           13                                    5

MnO                7439-96-5          1-10                          5                                 5 as dust

P2O5               1314-56-3          <1                     None Established                      None Established

TiO2               13463-67-7         <1                   5 Respirable Fraction                          10

AL2O3              1344-28-1          4-17                 5 Respirable Fraction                          10

CR2O3              7440-47-3          <1                            1                                    0.5





SECTION III - PHYSICAL DATA



                 N/A                                                                        N/A

Boiling Point                                             Percent Volatiles

                 N/A                                                                        N/A

Vapor Pressure                                            Solubility in H2O

                 80/63.4                                                                    N/A

Specific Gravity                                          Evaporation Rate

                 N/A                                                                        N/A

Freezing Point                                            Vapor Density

                        Dark gray rock-like material with no odor

Appearance and Odor





SECTION IV- HEALTH HAZARD DATA



                              Inhalation

Major Exposure Hazard

Effects of Overexposure - Various handling operations (crushing, grinding, sizing, conveying, etc.) may cause dust to

be released. Excessive exposure to high concentrations of dust may cause irritation of the mucous membranes of the

upper respiratory system and may cause coughing, sneezing and inflammation of the respiratory passages. Exposure

to slag dust containing small amounts of silica particles less than 5 microns in diameter may result in silicosis if inhaled

in high enough concentrations over an extended period of time. The principal manifestation of silicosis is difficult

breathing. This condition can progress to dry cough, shortness of breath on exertion, decreased lung function, and

massive pulmonary fibrosis. High level doses may cause acute Silicosis in 1 - 3 years. Chronic Silicosis may not

occur for 10 - 20 or more years after exposures begin, and sometimes long after they have ceased.

Based on animal experimental studies and human health findings, overexposure to slag dust and/or some

components of slag (i.e. various complexed amorphous silicates) can cause pneumoconiosis and may pose a

fibrogenic potential to the lung. Individuals overexposed to slag dusts may be at an increased risk of progression of

existing lung impairment. IARC has determined crystalline silica to be a probable human carcinogen. Repeated or

prolonged contact with the skin and direct eye contact with slag dust is likely to cause irritation. Contact with molten

slag can cause serious thermal burns and permanent scarring. Long-term inhalation of iron oxide dust may produce a

benign pneumoconiosis (siderosis)



Emergency and First Aid Procedures:

             Remove from exposure to dust, administer oxygen or artificial respiration as needed.

Inhalation

Skin Contact Wash skin with soap and water. For contact with molten product, do not remove contaminated

             clothing. Flush area with large amounts of cold water. If possible, submerge area in cold water, pack

             with ice and seek medical aid.

             Flush with water immediately for 15 minutes. Seek medical aid.

Eye Contact





SECTION V - FIRE AND EXPLOSION DATA



                                N/A                                                       N/A

Flash Point                                             Extinguishing Media

                                N/A                                                       N/A

Autoignition Temperature                                Special Fire Fighting Data

                                N/A                                                       N/A

Flammability Limits                                     Explosion Hazard

Fire and explosion hazards are not associated with this product.





SECTION VI - REACTIVITY DATA



                    Stable                                                         None

Stability                                       Decomposition Products

                    None                                                           None

Incompatibility                                 Hazardous Polymerization





SECTION VII - SPILL OR LEAK PROCEDURES



                Pick up mechanically or by hand tools. Fine material should be removed by vacuuming or wet

Spill or Leak

                sweeping to minimize dusting. Avoid using compressed air.

                Dispose of in proper manner as common non-hazardous waste.

Disposal

Clean-up personnel should be protected against eye or skin contact and inhalation of dust.





SECTION VIII - SPECIAL PROTECTION INFORMATION



                           A NIOSH/MSHA-approved dust respirator should be used to avoid excessive inhalation of

Respiratory Protection

                           particles. Appropriate respirator selection depends on the magnitude of exposure.

                Provide general ventilation or local exhaust ventilation where material is used or processed to prevent

Ventilation

                excessive dust exposure.

           Wear protective gloves as required for handling operations.

Gloves

Protective Clothing None required.

          Wear safety glasses with sideshields for impact and to prevent dust particles from entering the eye.

Eyes

          Depending upon conditions of use and specific work situations, additional protective equipment and/or

Other

          clothing may be required to control exposures.





SECTION IX - SPECIAL PRECAUTIONS



                         Use good housekeeping practices to prevent accumulation of dust, and follow sound

Handling and Storage

                         cleaning techniques that will keep airborne particulate to a minimum. Avoid inhalation of

                         dust and excessive contact with eyes and skin.

                       Personal hygiene should be encouraged.

Other Comments





Reviewed: 5/06