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pencco <br />Custorner Service 800-864-1742 <br />FAX 888-273-6226 <br />Revision Date 201:7-11-02 <br />Storage: Reacts with many metals to produce flamr-nable and explosive hydrogen gas. Keep away from <br />strong acids and bases, chlorites, organic peroxides, combusftle materials, and metals. Store in dry, cool <br />area. Store in a well -ventilated place away from heat and sources of ignition. Large tanks should be bermed <br />and electrically grounded. Avoid using glass, rnetal, or stoneware containers. <br />SECTION! 8 — Exposure Controls and Personal Protection <br />Respiratory Protection: Use a NIOSH-approved respirator or self-contained breathing apparatus whenever <br />exposure may exceed established Occupational Exposure Limits. Use respirator approved for acid fumes and <br />mist. <br />Eye Protection: Use chemical safety goggles and face shield. Do not wear contact lenses. <br />Skin Protection: Where there is possibility of skin contact, use the following as appropriate, to avoid skin <br />contact: gloves impervious to material, apron, boots, hood, pants, and jacket. Maintain a safety shower with <br />quick opening valves. Water should be supplied through insulated and heat-tracedlines to prevent freeze -ups in <br />cold weather. <br />SECTION 9 — Physical and Chemical Properties <br />Boiling Point: <br />136 - 163-C (277 - 3260F) <br />pH: <br />I.S-2.0 <br />Melting Point: <br />-18 - -20 'C (-I - 4 'F) <br />Solubili!y in Water: <br />ConiMete <br />Specific Gravity: <br />1.2 at 24®C <br />Vapor Pressure: <br />24 mm H9 at 25'C <br />% Volatile: <br />. .... <br />Unknown <br />Evaporation Rate: <br />N/A <br />Vapor Density (Air = 1): <br />N/A <br />Molecular Weight: <br />144 g/mol <br />..Appearance: <br />Water white to straw yellow <br />Odor: <br />I Puncient <br />SECTION 10 —Stability and Reactivity <br />Reactivity: Reacts with metals to form flammable hydrogen gas. <br />Stability: Stable at normal conditions. <br />Decomposition: Thermal decomposition yields hydrogen silica tetrafluo6de and hydrogen fluoride gas, <br />Incompatibility: Metals, glass, stoneware, alkali, strong concentrated acids. <br />"117-Twor, <br />Chronic Effects: Prolonged absorption of fluorides may result in fluorosis. Symptoms include changes inn <br />bone density, ossification of ligarnents and mottling of the dental enamel. <br />Safety Data Sheet — Hydrofluorosilicic Acid Page 4 of 6 <br />