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CRUDE OIL Page 3 of 8 limited to, one or more of the following: nasal discharge, sore throat, coughing, bronchitis, pulmonary edema and difficulty in breathing. Prolonged breathine of vapors can cause central nervous system effects. Signs and symptoms of central nervous system effects may include one or more of the followine: headache, dizziness, loss of appetite, weakness and loss of coordination. This hazard evaluation is based on the known toxicity of the ingredients in this substance. This substance contains sulfur compounds which may form hydrogen sulfide. The rotten eggs odor of "-vdrocen sulfide is unreliable as an indicator of concentration. Signs and svmotoms of overexo_ osure to hvdroxen sulfide include resoiratcry tract _r_ itatio^, headaches, dizziness, nausea, gastrointestinal disturbances, coughing, a sensation of dryness and pain in the rose, throat and chest, confusion and unconsciousness. Kvdrocen sulfide concentrations of '_000-2000 ppm can be extremely hazardous. This substance is highly toxic to internal organs __ inhaled. The degree of _njury will depend on the airborneIconcentration and duration of exposure. Read the Additional Health Data section (l2) of this document for more information. INGESTION: ,he oral toxicity of this substance has not been determined. However, it may be slightly toxic to interna'_ organs If swallowed. The degree of -ury will depend on tae amount absorbed from the out. This hazard evaluation is based or ta- known toxicity of the ingredients in this substance. Because of the low viscosity of this substance, it can directly enter the lures if it is swallowed (this is called aspiration) . This can occur durine the act of swallowing or when vomiting the substance. Once in the lungs, the substance is very difficult to remove and can cause severe injury to the lungs and death. 4. PROTECTIVE EQUIPMENT EYE PROTECTION: De not get this materia in your eyes. Eye contact can be avoided by wearing chemical g_oe_e_:es. SKIN PROTECTION: No special skin protection is usually necessary. Avoid proionced or frequently repeated skin contact with this material. Skin contact can be minimized by wearing protective clothing. RESPIRATORY PROTECTION: This material may be an inhalation hazard and, unless ventilation is adequate, the use of approved respiratory protection is recommended. Note; If any of the applicable hydrogen sulfide standards are likely to be exceeded, positive supplied-air respiratory protection must be used. The ACGIH TWA for hydrogen sulfide is 10 ppm. The OSHA STEL is l5-ppm. Refer to the OSHA Benzene Standard to determine what type of respirator is required based on exposure levels. VENTILATION: Use this material only in well ventilated areas. 5. FIRE PROTECTION Revision Number: 8 Revision Date: 06/19/90 MSDS Number: 002493 NDA - No Data Available NA - Not Applicable X-00SO21 (01-89)