Issue Date 04-May-2015 Revision Date 11-Jul-2018 Version 3 1. IDENTIFICATION CALCIUM HYDROXIDE HP-XL 2. HAZARDS IDENTIFICATION

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1 SAFETY DATA SHEET Issue Date 04-May-2015 Revision Date 11-Jul-2018 Version 3 1. IDENTIFICATION Product identifier Product Name CALCIUM HYDROXIDE HP-XL Other means of identification Product Code 0943 Synonyms Recommended use of the chemical and restrictions on use Recommended Use. Details of the supplier of the safety data sheet Manufacturer Address The Hallstar Company 120 S. Riverside Plaza, Suite 1620 Chicago, IL Telephone: (877) Emergency telephone number Company Phone Number (708) Emergency Telephone Chemtrec Classification 2. HAZARDS IDENTIFICATION OSHA Regulatory Status This chemical is considered hazardous by the 2012 OSHA Hazard Communication Standard (29 CFR ) Skin corrosion/irritation Category 2 Serious eye damage/eye irritation Category 2 Specific target organ toxicity (single exposure) Category 3 Label elements Warning Emergency Overview Hazard statements Causes skin irritation Causes serious eye irritation May cause respiratory irritation Appearance white powder Physical state Solid Odor no odor Precautionary Statements - Prevention Page 1 / 7

2 Wash face, hands and any exposed skin thoroughly after handling Avoid breathing dust/fume/gas/mist/vapors/spray Use only outdoors or in a well-ventilated area Wear protective gloves/eye protection/face protection Precautionary Statements - Response Specific treatment (see.? on this label) IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing If eye irritation persists: Get medical advice/attention IF ON SKIN: Wash with plenty of water and soap If skin irritation occurs: Get medical advice/attention Take off contaminated clothing and wash it before reuse IF INHALED: Remove person to fresh air and keep comfortable for breathing Call a POISON CENTER or doctor if you feel unwell Precautionary Statements - Storage Store in a well-ventilated place. Keep container tightly closed Store locked up Precautionary Statements - Disposal Dispose of contents/container to an approved waste disposal plant Hazards not otherwise classified (HNOC) is not listed as a carcinogen by ACGIH, MSHA, OSHA, NTP, DFG, RSST, or IARC. However, crystalline silica may be present below or above detection levels <0.1%. Occupational exposure is dependent upon the handling method and specific application. is not listed as a carcinogen by ACGIH, MSHA, OSHA, NTP, DFG, RSST, or IARC. However, crystalline silica may be present below or above detection levels <0.1%. Occupational exposure is dependent upon the handling method and specific application. Other Information is not listed as a carcinogen by ACGIH, MSHA, OSHA, NTP, DFG, RSST, or IARC. However, crystalline silica may be present below or above detection levels <0.1%. Occupational exposure is dependent upon the handling method and specific application. In contrast to the dry powder, calcium hydroxide, when diluted with water, can produce severe skin damage inhumans (alkaline burns), especially with prolonged skin contact. 3. COMPOSITION/INFORMATION ON INGREDIENTS Substance Synonyms. Chemical Name CAS Weight-% Trade Secret * Calcium Carbonate * Magnesium Oxide * Crystalline Silica <0.1 * If CAS number is "proprietary", the specific chemical identity and percentage of composition has been withheld as a trade secret. Description of first aid measures 4. FIRST AID MEASURES Eye contact Skin contact Rinse thoroughly with plenty of water for at least 15 minutes, lifting lower and upper eyelids. Consult a physician. Wash off immediately with plenty of water. Consult a physician if necessary. Inhalation Remove to fresh air. Page 2 / 7

3 Ingestion Clean mouth with water and drink afterwards plenty of water. 5. FIRE-FIGHTING MEASURES Suitable extinguishing media Use extinguishing measures that are appropriate to local circumstances and the surrounding environment. Specific hazards arising from the chemical. Protective equipment and precautions for firefighters As in any fire, wear self-contained breathing apparatus pressure-demand, MSHA/NIOSH (approved or equivalent) and full protective gear. 6. ACCIDENTAL RELEASE MEASURES Personal precautions, protective equipment and emergency procedures Personal precautions Ensure adequate ventilation, especially in confined areas. Environmental precautions Environmental precautions See Section 12 for additional Ecological Information. Methods and material for containment and cleaning up Methods for containment Methods for cleaning up Prevent further leakage or spillage if safe to do so. Pick up and transfer to properly labeled containers. 7. HANDLING AND STORAGE Precautions for safe handling Advice on safe handling Handle in accordance with good industrial hygiene and safety practice. Conditions for safe storage, including any incompatibilities Storage Conditions Incompatible materials Calcium hydroxide will react with air and moisture and strong acids. Keep away from nitro compounds and in contact with paper and straw. Strong acids. Hydrogen fluoride. 8. EXPOSURE CONTROLS/PERSONAL PROTECTION Control parameters Exposure Guidelines This product, as supplied, does not contain any hazardous materials with occupational exposure limits established by the region specific regulatory bodies. Chemical Name ACGIH TLV OSHA PEL NIOSH IDLH TWA: 5 mg/m 3 TWA: 15 mg/m 3 total dust TWA: 5 mg/m 3 respirable fraction TWA: 5 mg/m 3 (vacated) TWA: 5 mg/m 3 not in effect as a result of reconsideration Calcium Carbonate TWA: 10 mg/m 3 total dust TWA: 5 mg/m 3 respirable dust Magnesium Oxide TWA: 10 mg/m 3 inhalable fraction TWA: 15 mg/m 3 fume, total particulate (vacated) TWA: 10 mg/m 3 fume and total particulate (vacated) TWA: 0.1 mg/m 3 respirable dust IDLH: 750 mg/m 3 fume Crystalline Silica TWA: mg/m 3 respirable fraction IDLH: 50 mg/m 3 respirable dust TWA: 0.05 mg/m 3 respirable dust Page 3 / 7

4 Engineering Controls Showers Eyewash stations Ventilation systems. : (30)/(%SiO2 + 2) mg/m 3 TWA total dust : (250)/(%SiO2 + 5) mppcf TWA respirable fraction : (10)/(%SiO2 + 2) mg/m 3 TWA respirable fraction Individual protection measures, such as personal protective equipment Eye/face protection Skin and body protection Respiratory protection General Hygiene Considerations special technical protective measures are necessary. special technical protective measures are necessary. If exposure limits are exceeded or irritation is experienced, NIOSH/MSHA approved respiratory protection should be worn. Positive-pressure supplied air respirators may be required for high airborne contaminant concentrations. Respiratory protection must be provided in accordance with current local regulations. Handle in accordance with good industrial hygiene and safety practice. Information on basic physical and chemical properties 9. PHYSICAL AND CHEMICAL PROPERTIES Physical state Solid Appearance white powder Odor no odor Color Odor threshold Property Values Remarks Method ph Melting point / freezing point 580 C Boiling point / boiling range Flash point Evaporation rate Flammability (solid, gas) Flammability Limit in Air Upper flammability limit: Lower flammability limit: Vapor pressure Vapor density Relative density 2.2 Water solubility Solubility in other solvents 0 C Partition coefficient Other Information VOC Content (%) Density Bulk density Volatility 10. STABILITY AND REACTIVITY Reactivity Page 4 / 7

5 Ca(OH)2 dissociates in aqueous media forming calcium cations and hydroxyl anions data available Chemical stability Stable under recommended storage conditions. Possibility of Hazardous Reactions Reacts exothermically with acids. Conditions to avoid Extremes of temperature and direct sunlight. Incompatible materials Strong acids. Hydrogen fluoride. Hazardous Decomposition Products ne - Calcium hydroxide reacts with carbon dioxide to form calcium carbonate. Information on likely routes of exposure 11. TOXICOLOGICAL INFORMATION Product Information Inhalation Eye contact Skin contact Ingestion data available data available. data available. data available. data available. Chemical Name Oral LD50 Dermal LD50 Inhalation LC50 = 7340 mg/kg ( Rat ) - - Calcium Carbonate = 6450 mg/kg ( Rat ) Crystalline Silica = 500 mg/kg ( Rat ) - - Delayed and immediate effects as well as chronic effects from short and long-term exposure Sensitization. Germ cell mutagenicity. Carcinogenicity is not listed as a carcinogen by ACGIH, MSHA, OSHA, NTP, DFG, RSST or IARC. However crystalline silica may be present below or above detection levels <.1%. Occupational exposure is dependent upon the handling method and specific application. Chemical Name ACGIH IARC NTP OSHA Crystalline Silica A2 Group 1 Known X Reproductive toxicity. The following values are calculated based on chapter 3.1 of the GHS document. ATEmix (oral) 7, Ecotoxicity 12. ECOLOGICAL INFORMATION % of the mixture consists of component(s) of unknown hazards to the aquatic environment Chemical Name Algae/aquatic plants Fish Crustacea Page 5 / 7

6 Persistence and degradability. Bioaccumulation : 96 h Gambusia affinis mg/l LC50 static - Other adverse effects Waste treatment methods 13. DISPOSAL CONSIDERATIONS Disposal of wastes Contaminated packaging Disposal should be in accordance with applicable regional, national and local laws and regulations. Do not reuse container. Chemical Name California Hazardous Waste Status Corrosive 14. TRANSPORT INFORMATION DOT t regulated ICAO (air) t regulated IMDG t regulated International Inventories 15. REGULATORY INFORMATION Legend: TSCA - United States Toxic Substances Control Act Section 8(b) Inventory DSL/NDSL - Canadian Domestic Substances List/n-Domestic Substances List EINECS/ELINCS - European Inventory of Existing Chemical Substances/European List of tified Chemical Substances ENCS - Japan Existing and New Chemical Substances IECSC - China Inventory of Existing Chemical Substances KECL - Korean Existing and Evaluated Chemical Substances PICCS - Philippines Inventory of Chemicals and Chemical Substances AICS - Australian Inventory of Chemical Substances US Federal Regulations SARA 313 Section 313 of Title III of the Superfund Amendments and Reauthorization Act of 1986 (SARA). This product does not contain any chemicals which are subject to the reporting requirements of the Act and Title 40 of the Code of Federal Regulations, Part 372 SARA 311/312 Hazard Categories Page 6 / 7

7 Acute health hazard Chronic Health Hazard Fire hazard Sudden release of pressure hazard Reactive Hazard Yes CWA (Clean Water Act) CERCLA US State Regulations California Proposition 65 This product may contain chemicals known to the state of California to cause birth defects or other reproductive harm, crystalline silica. U.S. State Right-to-Know Regulations 16. OTHER INFORMATION, INCLUDING DATE OF PREPARATION OF THE LAST REVISION Health hazards 1 Health hazards 1 Issue Date 04-May-2015 Revision Date 11-Jul-2018 Revision te Disclaimer The information provided in this Material Safety Data Sheet is correct to the best of our knowledge, information and belief at the date of its publication. The information given is designed only as a guidance for safe handling, use, processing, storage, transportation, disposal and release and is not to be considered a warranty or quality specification. The information relates only to the specific material designated and may not be valid for such material used in combination with any other materials or in any process, unless specified in the text. End of Safety Data Sheet Page 7 / 7