Kraft Lignin Powder, Lignin, Lignin Sulfate and Thiolignin

Safety Data Sheet (SDS) Kraft Lignin 1. Identification TRADE NAME(S): SYNONYMS and/or GRADES: PRODUCT USES: CHEMICAL NAME/CLASS: Kraft Lignin Kraft Lignin Powder, Lignin, Lignin Sulfate and Thiolignin Used for Specialty Purposes Bio-Fuels and Specialty Chemicals MANUFACTURER'S NAME: Weyerhaeuser ADDRESS: 33663 Weyerhaeuser Way S., Federal Way WA 98001-9620 EMERGENCY PHONE: (844) 523-4081 (3E Company) BUSINESS PHONE: (253) 924-3865 INTERNET ACCESS: See section 16 REVISED DATE: May 29, 2015 2. Hazard(s) Identification Signal Word(s): WARNING NOTE: This product is not a combustible dust hazard in the hydrated form but may become hazardous as the result of downstream activities (e.g. drying, dispersion in air) that allows dried, small particles to become airborne. Complete list of hazards are described below. Product Classification Hazard Statement(s) Pictogram HEALTH Skin Sensitization Category 1 (H317)* Eye Irritation Category 2B (H320) May cause allergic skin reaction Causes eye irritation None Page 1 of 8 Rev. 05/29/2015

2. Hazard(s) Identification (cont d.) Combustible Dust (OSHA Defined Hazard) *Hazard codes (GHS) If converted to small particles and dried during further processing, handling, or by other means, may form combustible dust concentrations in air None HMIS Rating (Scale 0-4): Health = 2 Fire = 2 Physical Hazard = 1 NFPA Rating (Scale 0-4): Health = 1 Fire = 2 Reactivity = 0 Precautionary Statement(s): Prevention Statements: P210: Keep away from sparks, flame or other heat sources if dried material. P243: Take precautionary measures against static discharge if dried material. P260 and P261: Avoid breathing dust or mists. P280 and 281: Wear gloves and appropriate protective equipment for skin exposure. In case of inadequate ventilation wear an approved respirator suitable for conditions of use. P362 and P363: Take off contaminated clothing and wash before reuse. Response Statements: P304 and P340: If inhaled and breathing becomes difficult, remove person to fresh air and keep comfortable for breathing. P308 and P313: If experiencing respiratory symptoms, following removal to fresh air, call a doctor or other qualified medical professional. P313: If skin irritation or rash occurs get medical advice/attention. P362: Wash contaminated clothing before reuse. P352 and P264: If on skin wash with plenty of soap and water. Wash after handling. P338 and P351: If in eyes, rinse cautiously for several minutes. Remove contact lenses if present and easy to do so. Disposal: P501: Dispose of contents in accordance with Federal, state and local regulations. Ingredients of Unknown Acute Toxicity (>1%): 3. Composition/Information on Ingredients Ingredients CAS# Wt. % Kraft Lignin 1 8068-05-1 50-100 Sulfur 7704-34-9 0-3 Common names: lignin sulfate and thiolignin. 1 Lignin is derived when pulping black liquor is precipitated and neutralized by acid washing. The product represented on this SDS is the result of this process. Lignin is a complex polymer that occurs in woody material of higher plants. It is resistant to typical chemical and enzymatic degradation that occurs in Kraft pulp mills. Lignin is composed of various intermolecular linkages between phenylpropanes and guaiacyl, syringyl, p-hydroxyphenyl, and biphenyl nuclei. Sulfur may also be present in varying concentrations. The product is normally in a high moisture state with a significant amount of water resulting in the range of percent lignin listed as 50-100 depending on the content of water in different phases of the processing. Dried lignin is a combustible dust explosion hazard (see Section 5 below). Page 2 of 8 Rev. 05/29/2015

4. First Aid Measures Inhalation: Avoid inhalation of dust or mists. Kraft Lignin may cause unpleasant obstruction in the nasal passages, resulting in dryness of nose, dry cough and sneezing. Remove to fresh air. Seek medical attention if persistent irritation, severe coughing, or breathing difficulties occur. Eye Contact: Can cause irritation and reddening. Remove contact lenses if present and easy to do. Immediately flush with running water for 15 minutes including under eyelids. Treat powder in eyes as a foreign object. Flush with water to remove solid particles. Seek medical help if irritation persists. Skin Contact: Kraft Lignin may cause mechanical irritation and/or sensitization. Flush contaminated skin with plenty of water. Wash with mild soap and water. Skin Absorption: Not known to be absorbed through the skin. Ingestion: Not likely to occur under normal use - may irritate mouth, throat and stomach if ingested. Do not induce vomiting. Rinse mouth out with water. Drink large amounts of water. If persistent irritation or symptoms occur seek medical help. Symptoms or Effects: Acute Symptoms/Effects Irritant to the respiratory system, eyes. Sensitizer to the skin. Delayed Symptoms/Effects Unique delayed effects are not anticipated after exposure. See Section 11 for additional information on chronic effects. 5. Fire-fighting Measures Extinguishing Media and Restrictions: Water and dry chemical. Specific Hazards, Anticipated Combustion Products: Thermal decomposition of Kraft Lignin produces irritating and toxic fumes and gases including acrid smoke, carbon oxides (CO, CO2), nitrogen oxides (NO, NO2 etc.), sulfur oxides (SO2, SO3 etc.), hydrogen sulfide, aldehydes and organic acids. Autoignition Temperature: Variable (typically 400 500 C). Special Firefighting Equipment/Procedures: Beware of potential combustible dust explosion hazard if product is dried. Use caution to avoid dispersing dust. Use water to wet down dust to reduce the likelihood of ignition. Remove burned or wet dust to open area after fire is extinguished. Unusual Fire and Explosion Hazards: As with other organic dusts, airborne clouds of Kraft lignin dust may ignite and burn with explosive force. Residual sulfur in material may form toxic sulfur compounds such as sulfur oxides and hydrogen sulfide. May produce combustible dust in air if product is dried and dispersed. The typical minimum explosible concentration (MEC) used for lignin dust is 50 g/m 3. Kraft Lignin explosibility classification (*Kst dry = 254-338 bar m/s; *MIE dry = 3-10 mj) places lignin dust in the category of dusts which may potentially create a strong explosion under the right set of circumstances. According to guidance in the OSHA combustible dust publication OSHA 3371-08 2009 lignin dust would be classified as a Class ST3 combustible dust (*Kst dry = >300 bar.m/s), potentially causing a very strong explosion. Caution should be taken in the processing, shipping, handling and use of these materials, particularly if they are in a dry state. Dry fine powder or residues should not be allowed to accumulate and dust should be kept away from sources of ignition. Use appropriate level of controls and housekeeping to avoid dust accumulations. The explosibility is decreased if the material is kept moist. Reference NFPA standards 654, 69 and the NFPA Fire Protection Handbook for guidance. *Kst the maximum rate of pressure rise is used to calculate the Kst value; an internationally recognized index used to classify dust explosibility. *MIE minimum ignition energy of the dust cloud. Page 3 of 8 Rev. 05/29/2015

6. Accidental Release Measures Steps to be taken in case Material Is Released or Spilled: Sweep or vacuum up for recovery and disposal. Avoid creating dusty conditions whenever feasible. Maintain good housekeeping to avoid accumulation of dried lignin dust on exposed surfaces. Use approved filtering facepiece respirator ( dust mask ) and goggles where ventilation is not possible and exposure limits may be exceeded or for additional worker comfort. Place recovered lignin dust in a container for proper disposal. 7. Handling and Storage Precautions to be taken in Handling and Storage: Dried lignin dust may pose a combustible dust hazard. Keep away from ignition sources. Avoid eye contact. Avoid prolonged or repeated contact with skin. Avoid prolonged or repeated breathing of dusts. Avoid contact with oxidizing agents, alkali and drying oils. Store in well-ventilated, cool, dry place away from open flame. 8. Exposure Control Measures/Personal Protection Exposure Limits/Guidelines: Ingredient(s) Agency Exposure Limit(s) Comments Kraft Lignin OSHA OSHA 15 mg/m 3 - total dust 5 mg/m 3 - respirable PNOR PNOR Sulfur ACGIH ACGIH OSHA ACGIH 10 mg/m 3 - inhalable 3 mg/m 3 - respirable None None PNOS PNOS Ventilation: LOCAL EXHAUST Provide local exhaust as needed so that exposure limits are met. Ventilation to control dust should be considered where potential explosive concentrations and ignition sources are present. The design and operation of any exhaust system should consider the possibility of explosive concentrations of combustible lignin dust within the system. See SPECIAL section below. MECHANICAL (GENERAL) Assure that adequate exhaust or natural ventilation is provided to keep the airborne concentrations of lignin below exposure limits. SPECIAL Ensure that exhaust ventilation and material transport systems involved in handling this product contain explosion relief vents or suppression systems designed and operated in accordance with applicable standards if the operating conditions justify their use. OTHER ENGINEERING CONTROLS Personal Protective Equipment: RESPIRATORY PROTECTION Use filtering facepiece respirator ( dust mask ) tested and approved under appropriate government standards such as NIOSH (US),CSA (Canada), CEN (EU), or JIS (Japan) where exposure limits may be exceeded or for additional worker comfort or symptom relief. Use respiratory protection in accordance with jurisdictional regulatory requirements similar to the OSHA respiratory protection standard 29CFR 1910.134 following a determination of risk from potential exposures. PROTECTIVE GLOVES Chemical resistant gloves such as nitrile are recommended. EYE PROTECTION Tight fitting chemical goggles are recommended. OTHER PROTECTIVE CLOTHING OR EQUIPMENT Long sleeve protective garments may be used. Launder contaminated clothing prior to reuse. Chemical Protective clothing - if extremely dusty. WORK/HYGIENE PRACTICES Avoid generation of dust, avoid ignition sources and use approved local exhaust ventilation or handle in fume hood. Wash hands after handling product. Page 4 of 8 Rev. 05/29/2015

9. Physical/Chemical Properties Appearance: Brown fine powder with a faint odor. Odor/Odor Threshold(s): NAV ph: 3-7 (slurry phase) Melting/Freezing Point: Boiling Point (@ 760 mm Hg) and Range: Flash Point: Evaporation Rate: Flammability: Lower/Upper Explosive Limits: See section 5 for unusual hazards Vapor Pressure (mm Hg): Vapor Density (air = 1; 1 atm): Relative Density: Loose bulk density (lb./ft 3 )= 19-35 Solubility: Soluble in alkaline conditions Partition Coefficient (n-octonal/water): NAV Autoignition Temperature: Variable (typically 400 500 C) Decomposition Temperature: NAV Viscosity: Other Properties: 10. Stability and Reactivity Reactivity: Hazardous Polymerization: May occur Will not occur Stability: Unstable Stable Conditions to Avoid: Sources of ignition. Incompatibility (Materials to Avoid): Oxidizing agents. Product may ignite at temperatures in excess of 400 C. Hazardous Decomposition or By-Products: Thermal decomposition of Kraft Lignin produces irritating and toxic fumes and gases including acrid smoke, carbon oxides (CO, CO2), nitrogen oxides (NO, NO2 etc.), sulfur oxides (SO2, SO3 etc.), aldehydes and organic acids. Natural decomposition of organic materials such as wood may produce toxic gases and an oxygen deficient atmosphere in enclosed or poorly ventilated areas. Sensitivity to Static Discharge: Airborne lignin dust may be ignited by a static discharge depending on airborne concentrations, particle size and moisture content. 11. Toxicological Information Likely Route(s) of Exposure: Ingestion: Skin: Dust Inhalation: Dust Eye: Dust Signs and Symptoms of Exposure: Carcinogenicity Listing(s) (checked if applicable): NTP: Not Listed IARC Monographs: Not Listed OSHA Regulated: Not Listed Page 5 of 8 Rev. 05/29/2015

11. Toxicological Information (cont d.) Toxicity Data: Irritant/Sensitizer: May cause irritation and sensitization by skin contact (R 43), according to the EC criteria for classification and labeling requirements for dangerous substances and preparations (Council Directive 67/548/EEC). Skin sensitizer: (Category 1) - According to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2003). Ingestion: The oral LD50 value of Kraft Lignin in Wistar rats was > 2,000 mg/kg body weight. Eyes: Slightly irritating to the eyes. Components: Target Organs: Eyes, skin, and respiratory system. 12. Ecological Information Ecotoxicity: Commercial lignin and lignin in Kraft wastewater have shown acute toxic effects on D. magna and V. fischeri (Borton 2004). Biopersistance and Degradability: Slowly biodegradable. Multiple bacterial degradation pathways have been reported. Bioaccumulation: No information available. Soil Mobility: No information available. Other Adverse Effects: 13. Disposal Considerations Waste Disposal Method: Incineration in accordance with local, state, and federal regulations is preferred because emissions can be effectively controlled. Landfill disposal may be allowed in accordance with local, state, and federal regulations do not apply. It is, however, the user's responsibility to determine at the time of disposal whether your product meets RCRA criteria for hazardous waste. Note that lignin dust may pose a combustible dust hazard. 14. Transport Information Mode: (air, land, water) Not regulated as a hazardous material by the U.S. Department of Transportation. Not listed as a hazardous material in Canadian Transportation of Dangerous Goods (TDG). UN Proper Shipping Name: UN/NA ID Number: Hazard Class: Packing Group: Environmental Hazards (Marine Pollutant): Special Precautions: 15. Regulatory Information TSCA: Kraft lignin and sulfur are listed on the TSCA inventory. CERCLA: This product does not contain ingredients which are subject to the reporting requirements of CERCLA. DSL: Kraft lignin and sulfur are listed on the Domestic Substance List. OSHA: 29 CFR 1910.1200, Hazard Communication: Regulated as an irritant and a sensitizer. Page 6 of 8 Rev. 05/29/2015

15. Regulatory Information (cont d.) STATE RIGHT-TO-KNOW: California Proposition 65 This product does not contain substances identified on the Proposition 65 list. New Jersey This product does not contain substances listed in New Jersey. Pennsylvania Sulfur is listed on Pennsylvania s Appendix A Hazardous Substance List. SARA 313 Information: To the best of our knowledge, this product contains no chemical subject to SARA Title III Section 313 supplier notification requirements. SARA 311/312 Hazard Category: This product has been reviewed according to the EPA "Hazard Categories" promulgated under SARA Title III Sections 311 and 312 and is considered, under applicable definitions, to meet the following categories: An immediate (acute) health hazard Yes A delayed (chronic) health hazard Yes A corrosive hazard No A fire hazard No A reactivity hazard No A sudden release hazard No FDA: Not intended to be ingested or used in a direct /indirect food contact item. WHMIS Classification: Controlled Product: D2B Toxic Material (skin/eye irritation-reversible damage). D2B Toxic Other (skin sensitization). 16. Other Information Date Prepared: 08/02/2012 Date Revised: 05/29/2015 Prepared By: Weyerhaeuser Company Environment, Health, and Safety. Weyerhaeuser SDS available on: http://www.wy.com/sustainability/environment/product-stewardship/safety-data-sheets/ User s Responsibility: The information contained in this Safety Data Sheet is based on the experience of occupational health and safety professionals and comes from sources believed to be accurate or otherwise technically correct. It is the user s responsibility to determine if the product is suitable for its proposed application(s) and to follow necessary safety precautions. The user has the responsibility to ensure that the most current SDS is used. Definition of Common Terms: ACGIH = American Conference of Governmental Industrial Hygienists C = Ceiling Limit CAS# = Chemical Abstracts System Number DOT = U. S. Department of Transportation DSL = Domestic Substance List EC# = Identifying Number Assigned to Chemicals Contained in the European Inventory of Existing Chemical Substances (EINECS) EC50 = Effective Concentration That Inhibits the Endpoint to 50% of Control Population EPA = U.S. Environmental Protection Agency GHS = Globally Harmonized System of Classification and Labelling of Chemicals HMIS = Canada-Hazardous Materials Identification System HNOC = Hazards Not Otherwise Covered IARC = International Agency for Research on Cancer IATA = International Air Transport Association IMDG = International Maritime Dangerous Goods LC50 = Concentration in Air Resulting in Death To 50% of Experimental Animals LCLo = Lowest Concentration in Air Resulting in Death LD50 = Administered Dose Resulting in Death to 50% of Experimental Animals LDLo = Lowest Dose Resulting in Death Page 7 of 8 Rev. 05/29/2015

16. Other Information (cont d.) LEL = Lower Explosive Limit LFL = Lower Flammable Limit MSHA = Mine Safety and Health Administration = Not Applicable NAV = Not Available NIOSH = National Institute for Occupational Safety and Health NFPA = National Fire Protection Association NPRI = Canada-National Pollution Release Inventory NTP = National Toxicology Program OSHA = Occupational Safety and Health Administration PEL = Permissible Exposure Limit PNOR = Particulate Not Otherwise Regulated PNOS = Particulate Not Otherwise Specified RCRA = Resource Conservation and Recovery Act STEL = Short-Term Exposure Limit (15 minutes) STP = Standard Temperature and Pressure TCLo = Lowest Concentration in Air Resulting in a Toxic Effect TDG = Canada-Transportation of Dangerous Goods TDLo = Lowest Dose Resulting In a Toxic Effect TLV = Threshold Limit Value TSCA = Toxic Substance Control Act TWA = Time-Weighted Average (8 hours) UFL = Upper Flammable Limit WHMIS = Canada-Workplace Hazardous Materials Information System Page 8 of 8 Rev. 05/29/2015

Kraft Lignin All Grades: Kraft Lignin Powder, Lignin, Lignin Sulfate, Thiolignin Warning Lignin and/or Lignin dust may cause skin sensitization and respiratory and eye irritation. May Form Combustible Dust Concentrations in Air if Small Dried Particles Are Dispersed During Processing or Handling. Precautions: Avoid breathing dust. Wear gloves and appropriate protective equipment for respiratory, skin or eye exposures. Prevent dust release and accumulations to minimize hazards. Take off contaminated clothing and wash before reuse. Keep dust away from ignition sources such as heat, sparks, and flame. First Aid: If on skin wash with plenty of mild soap and water. If in eyes, rinse cautiously for several minutes. Remove contact lenses if present and easy to do so. If experiencing respiratory symptoms, skin irritation or rash, call a doctor or other qualified medical professional. Weyerhaeuser 33663 Weyerhaeuser Way South Federal Way, WA 98001 1-800-525-5440 Label for Kraft Lignin products. See SDS 5/2015 for additional information.