Material Safety Data Sheet SODIUM THIOSULFATESOLUTION

IProduct/Chemical Name: Sodium Thiosulfate, SolutionChemical Formula: Na2S203 + H20CAS Number: 007772-98-7Other Designations: Not available.General Use: Waste water dechlorinating agent, lab reagent.Manufacturer: Calabrian Corporation Tel: 409/727-1471

5500 Hwy. 366 Fax: 409/727-5803Port Neches, Texas 77651 CHEMTREC Emergency No. 800 I 424-9300

··SeC:;tion 2...'Compositionllnf(jrmationonlngredients

Composition TWA STEL IDLH CAS Number % wt or volSodium Thiosulfate * * * 10102-17-7 30-60 %Water * * * 007732-18-5 40-70 %Sodium Sulfite * * * 007757-83-7 1%Sodium Sulfate * * * 007757-82-6 1%

* none established.

$ectiorf3 - Hazards'lderitificatieU1:

Warning Statement:Hazard Rating:Primary Entry Routes:Target Organs:Acute Effects:

***** Emergency Overview *****

NoneHealth = 0, Fire = 0, Reactivity = 0, PPE - Sec. 8ContactEyes, skin, mucous membranesAcute effects to exposure of sodium thiosulfate includes eye and mucousmembrane irritation.Not likely to occurIrritantIrritantNot likely to occurIARC, NTP, and OSHA do not list sodium thiosulfate as a carcinogen.Prolonged or repeated exposure may cause dermatitis, and sensitizationreactions.

Medical Conditions Aggravated by Long-Term Exposure: Capable of provoking bronchospasm insulfite-sensitive individuals who have asthma.

Inhalation:Eye:Skin:Ingestion:Carcinogenicity:Chronic Effects:

MSDS No. 341.11 Page 1 Date: 03/2011

Material Safety Data Sheet SODIUM THIOSULFATESOLUTION

ExposureRoute Symptom Treatment

Inhalation: Sore throat, shortness of breathcoughing, and congestion.

Remove from exposure to fresh air. Seekmedical attention in severe cases or if recoveryis not rapid.

Eye Contact: Irritation to eyes and mucousmembranes.

Irrigate with water until no evidence ofchemical remains. Obtain medicalattention.

Skin Contact: Irritation, itching, dermatitis Wash with soap and drench with water.Remove contaminated clothing andwash before reuse.

Ingestion: Irritation to mucous membranes. Give large quantities of water or milkimmediately. Obtain medical attention.

After first aid, get appropriate medical attention.

Note to physician: Exposure may aggravate acute or chronic asthma, emphysema andbronchitis.

Special Precautions/Procedures: None indicated.

···SectioI15 -Fire~FightingMeasureS .Flash Point: Not combustible.Flash Point Method: Not Applicable.Burning Rate: Not Applicable.Autoignition Temperature: Not Applicable.LEL: Not Applicable.UEL: Not Applicable.Flammability Classification: Not Flammable.Extinguishing Media: Use extinguishing agent appropriate for surrounding fire conditions.Unusual Fire or Explosion Hazards: None indicated.Hazardous Combustion Products: May release hazardous gas.Fire-Fighting Instructions: Do not release runoff from fire control methods to sewers or

waterways.Fire-Fighting Equipment: Because fire may produce toxic thermal decomposition products,

wear a self-contained breathing apparatus (SCBA) with a full facepiece operated in pressure-demand or positive-pressure mode.

MSDS No. 341.11 Page 2 Date: 03/2011

Material Safety Data Sheet SODIUM THIOSULFATESOLUTION

Section S·lAceidental Release MeasuresSpill/ Leak Procedures:Small Spills / Leaks:

Large Spills I Leaks:Containment:

Wear appropriate PPE - See Section 8.Spills can be neutralized with an alkaline material such as causticsoda. Leaks may be located by spraying the area with ammoniumhydroxide solution which forms a white fume in the presence of sulfurdioxide.Large spills should be handled according to a predetermined plan.For large spills dike far ahead of contaminated runoff for later disposal.

Sectior17 ..;I-Iandling and Storage IHandling Precautions:Storage Requirements:

Avoid contact with product. Do not breath dust or vapor.Avoid heat or moisture. Store in areas, away from heat and moistureand protected from physical damage. Segregate from acids andoxidizers.

I............·<1

Ventilation: Provide general or local exhaust ventilation systems to maintainairborne concentrations below OSHA limits (Sec. 2). Local exhaustventilation is preferred because it prevents contaminant dispersioninto the work area by contrOlling it at the source.Follow OSHA respirator regulations (29 CFR 1910.134) and, ifnecessary, wear a MSHAINIOSH-approved respirator. Selectrespirator based on its suitability to provide adequate workerprotection for given working conditions, level of airbornecontamination, and presence of sufficient oxygen. For emergency ornon-routine operations (cleaning spills, reactor vessels, or storagetanks), wear a SCBA. Warning! Air-purifying respirators do not protectworkers in oxygen-deficient atmospheres.

Protective Clothing I Equipment: Wear protective gloves, boots, and clothing when necessary toprevent excessive skin contact. Wear protective eyeglasses orgoggles, per OSHA eye- and face-protection regulations (29 CFR1910J33).Make emergency eyewash stations, showers, and washing facilitiesavailable in the work area.Remove this material from personal protective equipment as needed.Do not eat, drink, or smoke in work areas. Practice good personalhygiene after using this material, especially before food or beverageconsumption.

Respiratory Protection:

Safety Stations:

Contaminated Equipment:Comments:

Section 9 ..Physical and Cl1emicalPropeFtiesPhysical State:Other Solubilities:Boiling Point:Freezing Point:Melting Point:Density:% Volatile:

MSDS No. 341.11

LiquidNASimilar to waterSimilar to waterSimilar to waterNA30-70 %

Water Solubility:Odor Threshold:Vapor Pressure:Vapor Density (Air=1):Evaporation Rate:pH:

CompleteNoneSimilar to waterSimilar to waterNormal6.5-8.0

Page 3 Date: 03/2011

M.aterial Safety Data Sheet SODIUM THIOSULFATESOLUTION

.: ,

Stability:Polymerization:Chemical Incompatibilities:

Stable under normal conditions.Hazardous polyrnerizatlon will not occur.In the presence of acid, sodium thiosulfate may release toxic andhazardous fumes of sulfur oxides, including sulfur dioxide. Acutepoisoning from sulfur dioxide is rare because the gas is easilydetected. It is so irritating that contact cannot be tolerated.Symptoms include coughing, hoarseness, sneezing, tearing, andbreathing difficulty. However, workers who cannot escape highaccidental exposure may suffer severe pulmonary damage which canbe fatal. Contact with powdered potassium, sodium metals, alkali,and oxidizing agents produce violent reactions. Reacts with waterand steam to form corrosive sulfurous acid. Reacts with chlorates toform unstable chlorine dioxide.

Conditions to Avoid: Avoid excessive heat, or open flame, and moisture.Hazardous Decomposition Products: May release hazardous sulfur dioxide gas.

Eye Effects (rabbit):Skin Effects (rabbit):Carcinogenicity:Chronic Effects:

Not available. Acute Inhalation Effects (rat): Not available.Not available. Acute Oral Effects (rat): Not availableIARC, NTP, and OSHA do not list sodium thiosulfate as a carcinogen.Prolonged or repeated exposure may cause dermatitis, and sensitizationreactions. Exposure to asthmatic, atopic and sulfite sensitive individuals mayresult in severe bronchioconstriction and reduced levels in forced expiratoryvolume. Acidic decomposition of sodium thiosulfate may release toxic andhazardous fumes of sulfur oxides, including sulfur dioxide, which may causepermanent pulmonary impairments from acute and chronic exposure. TheImmediately Dangerous to Life or Health (IDLH) level for S02 is 100 ppm.

············SEu:tion-12l Ecological InformationEcotoxicity:

Environmental Transport:Environmental Degradation:Soil Absorption/Mobility:

Sodium thiosulfate is a non hazardous solid commonly used as awaste water dechlorinating agent. High concentrations will contributeto elevated chemical oxygen demand in aquatic environments.Soluble in water.BiOlogical decomposition.Slight.

. . -~- .

.Sectiont3 -DispOsC'i1 C.~nsiderations.•Disposal:

Disposal Regulatory Requirements:Container Cleaning and Disposal:

Waste determinations typically consider sodium thiosulfatecontaminated materials to be non-hazardous.Follow applicable Federal, state and local regulations.Follow applicable Federal, state and local regulations.

MSDS No. 341.11 Page 4 Date: 03/2011

Material Safety Data Sheet SODIUM THIOSULFATESOLUTION

DOT Transportation Data (49 CFR 172.101):

Shipping Name:Shipping Symbols:Hazard Class:Subsidiary Hazard:IDNo.:Packing Group:Label:Special Provisions:

Sodium thiosulfate, non-regulated materialNANANANANANANA

IEPA Regulations:

RCRA Hazardous Waste Classification (40 CFR 261):RCRA Hazardous Waste Number (40 CFR 261):CERCLA Hazardous Substance (40 CFR 302.4):CERCLA Reportable Quantity (RQ):SARA Title III: Section 302 Extremely Hazardous Substance:

Section 313 Toxic Chemical:FIFRA: Not regulated.TSCA: Inventory listed chemical;Not listed in Toxic Substances Chemical Index

OSHA Regulations:Air Contaminant (29 CFR 1910.1000):OSHA SpeCifically RegUlated Substance:

Other Regulations:FDA: Regulated when used as a food preservative.

Not listed.Not listed.Not listed.NANot listed.Not listed.

Not listed.Not listed.

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The information herein is believed to be reliable. However, no warranty, express or implied, is made as to its accuracy orcompleteness and none is made as to the fitness of this material for any particular purpose or as to the merchantability or fitnessfor a particular purpose and the manufacturer hereby expressly waives any and all such warranties. Further, the manufacturer doeswarrant that the material sold will conform strictly to speCifications. The manufacturer shall not be liable for damages to person orproperty arising from or relating to the use, handling, or storage of Product unless damage is due to the manufacturer's negligenceor willful misconduct. Nothing herein shall be construed as a recommendation for use of any product in violation of any patent.

MSDS NQ. 341.11 Page 5 Date: 03/2011