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(1028) PAGE 7 LOC 84 RECOMMENDED £XTINGUISr `,G MEDIA : NFPA ( CO2, DRY 'h_.ICAL OR FOAM ) EXTINGUISHER OR WATER SPRAY. SPECIAL FIRE FIGHTI4G PROCEDURES: FIREFIGHTERS SHOULD BE E9UIPPED WITH NIOSH APPROVED FULLY ENCLOSED SELF-CONTAINED BREATHING APPARATUS WITH A PLASTIC WINDOW IN THE HOOD. UNUSUAL FIRE / EXPLOSION HAZARDS: MATERIAL CAN GENERATE_ EXPLOSIVE HYDROGEN GAS ON CONTACT WITH CERTAIN METALS AND REACTS VIOLENTLY WITH WATER. SECTION V -------------- HEALTH INFORMATION =___________---------------- • -- ---------------THRESHOLD LIMIT LIMIT VALUE : TWA= 3 PPM (APPROX 2. 5 MG/M3) STEL= 6 PPM (5 . 0 MG/M3) OSHA PEL: TWA= 3 PPM STEL= 6 PPM . ACUTE TOXICITY: LC50 ( IHL-RAT) = 1276 PPM/1HOUR EFFECTS OF OVEREXPOSURE: HYDROFLUORIC ACID IS EXTREMELY IRRITATING AND CORROSIVE TO THE SKIN AND MUCOUS MEMBRANES. INHALATION OF THF VAPOR MAY CAUSE ULCERS OF THE UPPER RESPIRATORY TRACT. CONCENTRATIONS AT 50 TO 200 PPM ARE DANGEROUS . HYDROFLUORIC ACID PRODUCES SEVERE SKIN BURNS WHICH ARE SLOW IN HEALING. THE SUBCUTANEOUS TISSUE MAY BE AFFECTED, BECOMING BLANCHED AND BLOODLESS. GANGREiWE OF THE AFFECTED AREAS MAY FOLLOW. SYMPTOMS : CONJUNCTIVITIS, CORNEAL BURNS: SEVERE SKIN BURNS WITH ULCERATION: PAIN BEHIND THE BREASTBONE, COUGH, SPITTING BLOOD, DYSPNEA, DIFFICULT BREATHING, BRONCHOPNEUMONIA, CYANOSIS, SHOCK, MUSCLE SPASMS, CONVULSIONS, JAUNDICE, OLIGURIA, ALBUMINURIA, HEMATURIA, NAUSEA, VOMITING, ABDOMINAL PAIN, DIARRHEA: BURNS AND CORROSION OF MOUTH, ESPOPHAGUS, STOMACH AND SMALL DOWEL. EMERGENCY FIRST AID PROCEDURES: EYE CONTACT: IF EVEN MINUTE QUANTITIES OF HYDROFLUORIC ACID ENTER THE EYES. THEY SHOULD BE IMMEDIATELY IRRIGATED WITH RUNNING WATER FOR AT LEAST 15 MINUTES. THE EYELIDS SHOULD 9E HELD APART DURING THE IRRIGATION TO INSURE CONTACT OF WATER WITH ALL ACCESSIBLE TISSUE OF THE EYES AND LIDS. A 1 % CALCIUM GLUCONATE SOLUTION SHOULD BE USED TO WASH THE EYES THOROUGHLY FOR 5-10 MINUTES AND THEN INSTILLED EVERY 2-3 HOURS AS DROPS. A PHYSICIAN, PREFERABLY AN EYE SPECIALIST, SHOULD BE CALLED IN AT ONCE. NO OILS OR OILY OINTMENT SHOULD BE USED UNLESS ORDERED BY THE PHYSICIAN. SKIN CONTACT: WORKERS WHO HAVE HAD CONTACT WITH HYDROFLUORIC ACID SHOULD BE SUBJECTED IMMEDIATELY TO A DRENCHING SHOWER OF WATER. THE CLOTHING SHOULD BE REMOVED AS RAPIDLY AS POSSIBLE, EVEN WHILE THE VICTIM IS IN THE SHOWER, AND MEDICAL ASSISTANCE OBTAINED IMMEDIATELY . IT IS ESSENTIAL THAT THE EXPOSED AREA BE WASHED WITH COPIOUS QUANTITIES OF WATER FOR A SUFFICIENT PERIOD OF TIME TO REMOVE ALL HYDROFLUORIC ACID FROM THE SKIN. CALCIUM GLUCONATE GEL ( 2. 5X) SHOULD BE RUBBED IN CONTINUOUSLY UNTIL PAIN HAS COMPLETELY SUBSIDED . AS AN ALTERNATE TO THE GEL TREATMENT, AN ICED AQUEOUS OR ALCOHOLIC SOLUTION, 7.13% (1 :750) OF BENZALKONIUM CHLORIDE ("ZEPHIRAN" CHLORIDE) : AN ICED 70% ALCOHOL SOLUTION: OR AN ICE-COLD SATURATED SOLUTION OF MAGNESIUM SULFATE (EPSOM SALT) SHOULD BE APPLIED FOR AT LEAST 30 MINUTES . IF THE RURN IS IN SUCH AN AREA THAT IT IS IMPRACTICLE TO IMMERSE THE PART, THEN THE ICED SOLUTION SHOULD BE APPLIED WITH SATURATED COMPRESSES WHICH SHOULD BE CHANGED AT LEAST EVERY TWO MINUTES. THE PHYSICIAN SHOULD 8E AVAILABLE BY THEN TO ADMINISTER FURTHER TREATMENT BEFORE THE COMPLETION OF THE ICED SOLUTION TREATMENT. IF ,