This is to certify that the management system of:

Occidental Chemical Corporation

OxyChem® Oxy Vinyls, LP Oxy Vinyls Canada Co. Armand Products Company

Client Number: 93014 Headquarters 266 Highway 3142 Hahnville, LA 70057

Has been assessed and certified as meeting the requirements of:

ISO 9001:2015

This certificate of registration remains valid subject to satisfactory surveillance audits for the following activities:

Production and Distribution of:

Chlorine, Caustic Soda, Caustic Potash, ACL 90 Chlorinated Isocyanurates, Chlorinated Organic compounds, Ethylene Dichloride, Polyvinyl Chloride, Potassium Carbonate and Bicarbonate, Hydrochloric Acid, Sodium Chlorite, Sodium Silicate and Vinyl Chloride Monomer.

Headquarters – Central Location for Quality – Significant processes include: Customer Feedback, Management Review and Internal Audit.

Standard Certificate Number Certified Since

ISO 9001:2015 QSR-107 6/11/1993

Date Issued Certification Date Valid Until 10/09/2020 11/13/2019 11/12/2022

This certificate also covers additional sites and activities as listed in the below appendix.

FM-14 Cert 9001 14001 (05/28/20)

Page 1 of 2

FM-14 Cert 9001 14001 (05/28/20)

Appendix

OxyChem – Augusta site 1620 Marvin Griffin Rd. Augusta, GA 30906 Production & Distribution of Sodium Silicate.

OxyChem – Chicago site 4201 W 69th St Chicago, IL 60629 Production & Distribution of Sodium Silicate and distribution of Caustic Potash.

OxyChem – Cincinnati site 4701 Paddock Rd. Cincinnati, OH 45229 Production & Distribution of Sodium Silicate.

OxyChem – Convent site 7377 HWY 3217 Convent, LA 70723 Production & Distribution of Caustic Soda, Chlorine & Ethylene Dichloride.

OxyChem – Dallas site 1100 Lenway St. Dallas, TX 75215 Production & Distribution of Sodium Silicate.

OxyChem – Geismar site 8318 Ashland Rd Geismar, LA 70734 Production & Distribution of Caustic Soda, Chlorinated Organic Compounds, & Chlorine.

OxyChem – Ingleside site 4133 Hwy 361 Gregory, TX 78359 Production & Distribution of Caustic Soda, Chlorine & Vinyl Chloride Monomer.

OxyChem – Mobile site 1300 Jarvis Rd. Mobile, AL 36614 Production & Distribution of Sodium Silicate and distribution of Caustic Soda.

OxyChem – Niagara Falls site 4700 Buffalo Ave Niagara Falls, New York 14302 Production & Distribution of Caustic Soda, Chlorine & Hydrochloric Acid.

OxyChem – New Johnsonville site 1900 DuPont Rd. New Johnsonville, TN 37134 Production & Distribution of Caustic Soda & Chlorine.

OxyChem – Sauget sites 520 Monsanto Ave, Sauget, IL 62206 Stellar Manufacturing - 1647 Sauget Business Blvd., East St. Louis, IL 62206 Production & Distribution of ACL® 90 Chlorinated Isocyanurates.

OxyChem – Taft site 266 HWY 3142 Hahnville, LA 70057 Production & Distribution of Caustic Soda, Caustic Potash, and Chlorine.

OxyChem – Wichita site 6200 S. Ridge Rd Wichita, KS 67215 Production & Distribution of Caustic Soda, Chlorinated Organic Compounds, Chlorine, Hydrochloric Acid, and Sodium Chlorite.

Oxy Vinyls, LP – Battleground site 2800 Park Rd. 1836 La Porte, TX 77571 Production & Distribution of Caustic Soda & Chlorine.

Oxy Vinyls, LP – Deer Park site 1000 Tidal Rd. Deer Park, TX 77536 Production & Distribution of Dry Caustic Potash and Polyvinyl Chloride and the distribution of Liquid Caustic Soda & Liquid Caustic Potash.

Oxy Vinyls, LP – Pasadena site 4403 Pasadena Freeway Pasadena, TX 77503 Production & Distribution of Polyvinyl Chloride Resins.

Oxy Vinyls, LP – Pedricktown, NJ site Rt 130 & Porcupine Rd Pedricktown, NJ 08067 Production & Distribution of Polyvinyl Chloride Resins.

Oxy Vinyls Canada Co – Niagara Falls, Ontario site 8800 Thorold Townline Rd. Thorold, Ontario L2E 6V9 Canada Production & Distribution of Polyvinyl Chloride Resins.

Armand Products Company 1000 N. Wilson Dam Rd Muscle Shoals, AL 35661 Production & Distribution of Potassium Carbonate & Potassium Bicarbonate.

Certificate Number: QSR-107 Page 2 of 2