Safety Data Sheet SODIUM THIOSULFATE SOLUTION

1 Safety Data Sheet SODIUM THIOSULFATE SOLUTION . Section 1 - Product and Company Identification Product Name: SODIUM THIOSULFATE SOLUTION Chemical Formula: Na2S2O3. CAS Number: 00772-98-7. General Use: Waste water dechlorination agent and lab reagent Supplier: Skyhawk Chemicals, Inc. 701 N Post Oak Rd., Ste. 540. Houston, TX 77024. Telephone: 713-957-2200/800-535-2847. Fax: 713-957-0345. Email: Emergency Contact: CHEMTREC/800-424-9300/ACCT #: CCN721839. Section 2 - Hazards Identification Emergency Overview Target Organs: None GHS Classification: Not a dangerous substance or mixture GHS Label Elements: None Hazard Statements: None Precautionary None Statements: HMIS Classification: Health Hazard 1.

2 Flammability 0. Reactivity 0. Potential Health Inhalation: Irritant Effects: Eye: Irritant Skin: Irritant Ingestion: Harmful if swallowed Medical Condition aggravated by long term exposure - Capable of provoking bronchospasm in sulfite sensitive individuals with asthma. Section 3 Composition / Information on Ingredients Composition CAS Number % Wt SODIUM THIOSULFATE 10102-17-7 30 - 60. Water 7732-18-5 40 -70. SODIUM Sulfite 7757-83-7 SODIUM Sulfate 7757-82-6 Section 4 - First Aid Measures 1. Safety Data Sheet SODIUM THIOSULFATE SOLUTION .

3 Exposure Route Symptom Treatment Inhalation: Sore throat, shortness of Remove from exposure to fresh air. Seek breath coughing, and medical attention in severe cases or if congestion. recovery is not rapid. Eye Contact: Irritation to eyes and mucous Irrigate with water until no evidence of membranes. chemical remains. Obtain medical attention. Skin Contact: Irritation, itching, dermatitis Wash with soap and drench with water. Remove contaminated clothing and wash before reuse. Ingestion: Irritation to mucous membranes.

4 Give large quantities of water or milk immediately. Obtain medical attention. After first aid, get appropriate medical attention. Note to Physician: Exposure may aggravate acute or chronic asthma, emphysema and bronchitis. Section 5 - Fire-Fighting Measures Flash Point: Not com bustible. Flash Point M ethod: Not Applicable. Burning Rate: Not Applicable. Auto ignition Temperature: Not Applic able. LEL: Not Applic able. UEL: Not Applic able. Flammability Classification: Not Flamm able. Extinguishing M edia: Use extinguishing agent appropriate f or surrounding f ire conditions.

5 Unusual Fire or Explosion Hazards: None indic ated. Hazardous Combustion Products: Ma y release hazardous gas . Fire-Fighting Instructions: Do not release runof f from fire control m ethods to s ewers or waterwa ys. Fire-Fighting Equipment: Because f ire m ay produce toxic therm al decom position products, wear a self -contained breathing apparatus (SCBA) with a f ull f ace piec e operated in pressure-demand or pos itive-pressure m ode. Section 6 - Accidental Release Measures Spill / Leak Procedures: W ear appropriate PPE - See Sec tion 8.

6 Small Spills / Leaks: Leak s m ay be located b y s pra ying the area with ammonium hydrox ide SOLUTION which f orm s a white f um e in the presence of sulf ur diox ide. Large Spills / Leaks: Large spills should be handled according to a predeterm ined plan. Containment: For large spills, dike f ar ahead of contaminated runoff for later disposal. Section 7 - Handling and Storage Handling Precautions: Avoid contact with product. Do not breathe vapor. Storage Requirements: Avoid heat or moisture. Store in areas, away f rom heat and moisture and protected f rom physical damage.

7 Segregate f rom acids and oxidizers. 2. Safety Data Sheet SODIUM THIOSULFATE SOLUTION . Section 8 - Exposure Controls / Personal Protection Composition C AS Number TW A ST EL ID L H. SODIUM Sulf ite 007757-83-7 * * *. SODIUM Sulf ate 007757-82-6 * * *. * None established. Control as nuisance dus t. Ventilation: Provide general or local ex haust ventilation s ystem s to m aintain airborne concentrations below OSHA lim its (Sec. 2). Local ex haust ventilation is pref erred because it prevents contam inant dispers ion into the work area by c ontrolling it at the source.

8 Respiratory Protection: Follow OSHA respirator regulations (29 CFR ) and, if neces sar y, wear a MSHA/NIOSH-approved respirator. Select respirator based on its suitabilit y to provide adequate work er protection f or given work ing conditions , level of airborne c ontam ination, and pres ence of suff icient ox ygen. For em ergenc y or non-routine operations (cleaning spills, reactor vessels, or storage tank s), wear a SCBA. W arning! Air-purify ing respirators do not protect workers in oxy gen-deficient atmos pheres.

9 Protective Clothing / W ear protective gloves, boots, and clothing when necessary to prevent Equipment: excessive skin contact. W ear protective eyeglasses or goggles, per OSHA eye- and f ace-protection regulations (29 CFR ). Safety Stations: Make emergenc y eyewash stations, showers, and washing f acilities available in the work area. Contaminated Equipment: Remove this material f rom personal protective equipment as needed. Comments: Do not eat, drink, or s moke i n work areas. Practice good personal hygiene af ter using this material, especially bef ore f ood or beverage consumption.

10 Section 9 - Physical and Chemical Properties Physical State: Li qui d Water Solubility: Com pletel y m iscible Other Solubility: NA Odor Threshold: None Boiling Point: Sim ilar to water Vapor Pressure: Sim ilar to water Freezing Point: Similar to water Vapor Density: Sim ilar to water M elting Point: Sim ilar to water Evaporation Rate: Norm al Density: NA p H: Volatility: 30 70 %. Section 10 - Stability & Reactivity Stability: Stable under normal conditions. Polymerization: Hazardous polymeri zation wil l not occur.