Part A for Smooth-Cast 325, 326 and 327; Task 9 and 10

2.1 Classification of the substance or mixture

Not a hazardous substance or mixture according to United States Occupational Safety and Health Administration (OSHA) Hazard Communication Standard (29 CFR 1910.1200), the Canadian Workplace Hazardous Materials Information System (WHMIS) and Council Directive 1999/45/EC and its subsequent amendments.

Hazard pictograms

none

Signal word

none General Precautions P101: If medical advice is needed, have product container or label at hand. P102: Keep out of reach of children. P103: Read label before use.

2.3 Other hazards

none Section 3 - Composition / Information on Ingredients 3.1 Substances No ingredients are hazardous according to 2012 OSHA Regulation 29 CFR 1910.1200 criteria. Section 4 - First Aid Measures 4.1 Description of first aid measures Inhalation: Remove source(s) of contamination and move victim to fresh air. If breathing has stopped, give artificial respiration, then oxygen if needed. Contact physician immediately. Eye Contact: Flush eyes with plenty of water. If irritation persists, seek medical attention. Skin Contact: In case of skin contact, wash thoroughly with soap and water. Ingestion: Do not induce vomiting unless instructed by a physician. Never give anything by mouth to an unconscious person. 4.2 Most important symptoms and effects, both acute and delayed: none known. 4.3 After first aid, get appropriate in-plant, paramedic, or community medical support. Section 5 - Fire-Fighting Measures 5.1 Extinguishing Media: Water Fog, Dry Chemical, and Carbon Dioxide Foam 5.2 Special hazards arising from the substance or mixture: None known. 5.3 Advice for firefighters: Use water spray to cool fire-exposed surfaces and to protect personnel. Shut off “fuel” to fire. If a leak or spill has not ignited, use water spray to disperse the vapors. Either allow fire to burn under controlled conditions or extinguish with foam or dry chemical. Try to cover liquid spills with foam. Because fire may produce toxic thermal decomposition products, wear a self-contained breathing apparatus (SCBA) with a full face piece operated in pressure demand or positive-pressure mode. Section 6 - Accidental Release Measures 6.1 Personal precautions, protective equipment and emergency procedures: Only properly protected personnel should remain in the spill area; dike and contain spill. Stop or reduce discharge if it can be done safely. 6.2 Environmental precautions: No special environmental precautions required. 6.3 Methods and material for containment and cleaning up: absorb or scrape up excess into suitable container for disposal; wash area with dilute ammonia solution 6.4 Reference to other sections: See Section 3 for Hazardous Ingredients; Section 8 for Exposure Controls; and Section 13 for Disposal. Section 7 - Handling and Storage 7.1 Precautions for safe handling: Use good general housekeeping procedures. Wash hands after use. 7.2 Conditions for safe storage, including any incompatibilities: Keep container(s) tightly closed and properly labeled. Store in cool, dry, well ventilated place away from heat, direct sunlight, strong oxidizers and any incompatibles. Store in approved containers and protect against physical damage. Keep containers securely sealed when not in use. Indoor storage should meet OSHA standards and appropriate fire codes. Containers that have been opened must be carefully resealed to prevent leakage. Empty containers retain residue and may be dangerous. Avoid water contamination. 7.3 Specific end use(s): These precautions are for room temperature handling. Other uses including elevated temperatures or aerosol/spray applications may require added precautions. Section 8 - Exposure Controls / Personal Protection 8.1 Control parameters: none defined 8.2 Exposure controls: Respiratory Protection: Use of this product does not require the use of a respirator. Should other occupational exposure factors warrant a respirator, follow OSHA respirator regulations 29 CFR 1910.134 and European Standards EN 141, 143 and 371; wear an MSHA/NIOSH or European Standards EN 141, 143 and 371 approved respirators equipped with appropriate cartridges. Hand Protection: Wear any liquid-tight gloves such as butyl rubber, neoprene or PVC. Eye Protection: Safety glasses with side shields per OSHA eye- and face-protection regulations 29 CFR 1910.133 and European Standard EN166. Contact lenses are not eye protective devices. Appropriate eye protection must be worn instead of, or in conjunction with contact lenses. Other Protective Clothing/Equipment: Additional protective clothing or equipment is not normally required. Provide eye bath and safety shower. Comments: Never eat, drink, or smoke in work areas. Practice good personal hygiene after using this material, especially before eating, drinking, smoking, using the toilet, or applying cosmetics. Wash thoroughly after handling. Page 2 of 5 Section 9 - Physical and Chemical Properties 9.1 Information on basic physical and chemical properties: Appearance : translucent viscous liquid Vapor Pressure: None (Polymeric Resin) Odor/Threshold: Mild to sweet odor Vapor Density (Air=1): >1 pH: N.A. (non-aqueous) Specific Gravity (H2O=1, at 4 °C): 1.07 Melting Point/Freezing Point: N.A. Water Solubility: Insoluble Low/High Boiling Point: N.A. Partition coefficient: Not available Flash Point: >300 °F Auto-ignition temperature: Not available Evaporation Rate: Not available Decomposition temperature: Not available Flammability: f.p. at or above 200 °F Viscosity: 20,000 – 30,000 centipoise UEL/LEL: Not available % Volatile: Nil Section 10 - Stability and Reactivity 10.1 Reactivity: No hazardous reactions if stored and handled as prescribed/indicated., No corrosive effect on metal. Not fire propagating. 10.2 Chemical stability: These products are stable at room temperature in closed containers under normal storage and handling conditions. 10.3 Possibility of hazardous reactions: Hazardous polymerization cannot occur. 10.4 Conditions to avoid: none known 10.5 Incompatible materials: strong bases and acids 10.6 Hazardous decomposition products: Thermal oxidative decomposition can produce carbon oxides, gasses/vapors, and traces of incompletely burned carbon compounds.

TOXICOLOGICAL INFORMATION

11.1 Information on toxicological effects: Skin Corrosion/Irritation: no data Serious Eye Damage/Irritation: no data Respiratory/Skin Sensitization: no data Germ Cell Mutagenicity: no data Carcinogenicity: No component of this product at levels greater than or equal to 0.1% is identified as a carcinogen or potential carcinogen by IARC, NTP, or OSHA. Reproductive Toxicity: no data Specific Target Organ Toxicity – Single Exposure: no data Specific Target Organ Toxicity – Repeated Exposure: no data

Aspiration hazard

no data Acute Toxicity: (calculated) Chronic Exposure: no data

Potential health effects

Miscellaneous no data

ECOLOGICAL INFORMATION

12.1 Toxicity: no data 12.2 Persistence and Degradability: no data 12.3 Bioaccumulative Potential: no data 12.4 Mobility in Soil: no data

Results of PBT and vPvB assessment

no data

Other hazards

no data Page 3 of 5

Disposal

Considerations 13.1 Waste treatment methods: Under Resource Conservation and Recovery Act (RCRA) it is the responsibility of the user of the product to determine at the time of disposal whether the product meets RCRA criteria for hazardous waste as defined in 40 CFR Parts 261. Waste management should be in full compliance with federal, state and local laws. Empty containers retain product residue which may exhibit hazards of material, therefore to not pressurize, cut, glaze, weld or use for any other purposes. Return drums to reclamation centers for proper cleaning and reuse. Section 14 - Transport Information Not regulated by DOT, IATA or IMDG

UN Number

none 14.2 UN proper shipping name: none 14.3 Transport hazard class(es): not applicable 14.4 Packing group: not applicable

Environmental hazards

none known 14.6 Special precautions for user: none known 14.7 Transport in bulk according to Annex II of MARPOL73/78 and the IBC Code: not applicable Section 15 - Regulatory Information 15.1 Safety health and environmental regulations/legislation specific for the substance or mixture: In the United States (EPA Regulations): TSCA Inventory Status (40 CFR710): All components of this formulation are listed in the TSCA Inventory. SARA 302 Components: No chemicals in this material are subject to the reporting requirements of SARA Title III, Section 302. SARA 313 Components: No chemicals in this material are subject to the reporting requirements of SARA Title III, Section 313. SARA 311/312 Hazards: none California Proposition 65: This product does not intentionally contain any chemicals known to the state of California to cause cancer, birth defects or other reproductive harm. 15.2 Chemical safety assessment: No chemical safety assessment has been carried out for this substance/mixture by the supplier. Page 4 of 5

Further information

HMIS H 1 0 F 0 1 0 R 0 SDS Version: 4 NFPA Date Prepared November 24, 2015 Glossary: ACGIH-American Conference of Governmental Industrial Hygienists; ANSI-American National Standards Institute; Canadian TDG-Canadian Transportation of Dangerous Goods; CAS-Chemical Abstract Service; Chemtrec-Chemical Transportation Emergency Center (US); CHIP-Chemical Hazard Information and Packaging; DSL-Domestic Substances List; EC-Equivalent Concentration; EH40 (UK)- HSE Guidance Note EH40 Occupational Exposure Limits; EPCRA-Emergency Planning and Community Right-To-Know Act; ESL-Effects screening levels; GHS-Globally Harmonized System of Classification and Labelling of Chemicals; HMIS-Hazardous Material Information Service; IATA-International Air Transport Association; IMDG-International Maritime Dangerous Goods Code; LC-Lethal Concentration; LD-Lethal Dose; LEL-Lower Explosion Level; NFPA-National Fire Protection Association; OEL- Occupational Exposure Limit; OSHA-Occupational Safety and Health Administration, US Dept. of Labor; PEL-Permissible Exposure Limit; RCRA-Resource Conservation and Recovery Act; SARA (Title III)- Superfund Amendments and Reauthorization Act; SARA 313-Superfund Amendments and Reauthorization Act, Section 313; SCBA-Self-Contained Breathing Apparatus; STEL-Short Term Exposure Limit; TCEQ-Texas Commission on Environmental Quality; TLV-Threshold Limit Value; TSCA- Toxic Substances Control Act Public Law 94-469; TWA-Time Weighted Value; UEL-Upper Explosion Level; US DOT-US Department of Transportation; WHMIS-Workplace Hazardous Materials Information System. Disclaimer: The information contained in this Safety Data Sheet (SDS) is considered accurate as of the version date. However, no warranty is expressed or implied regarding the accuracy of the data. Since the use of this product is not within the control of Smooth-On Inc., it is the user's obligation to determine the suitability of the product for its intended application and assumes all risk and liability for its safe use. This SDS is prepared to comply with the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) as prescribed by the United States (US) Occupational Safety and Health Administration (OSHA) Hazard Communication Standard (29 CFR 1910.1200), the Canadian Workplace Hazardous Materials Information System (WHMIS), and European Union Regulation (EC) No 1907/2006 of the European Parliament and of the Council of 18 December 2006 (REACH). Classifications of the chemical in accordance with 29 CFR 1910.1200, signal word, hazard and precautionary statement(s), symbol(s) and other information are based on listed concentration of each hazardous ingredient. Unlisted ingredients are not "hazardous" per the OSHA Hazard Communication Standard (29 CFR 1910.1200), WHMIS and EC No 1907/2006 and are considered trade secrets under US Federal Law (29 CFR and 40 CFR), Canadian Law (Health Canada Legislation), and European Union Directives.