Restek Corporation

(A2LA Cert. No. 3222.01) 12/31/2025 Page 1 of 3 SCOPE OF ACCREDITATION TO ISO 17034:2016 RESTEK CORPORATION 110 Benner Circle Bellefonte, PA 16823 Karen Risha Phone: 814 353 1300 REFERENCE MATERIALS PRODUCER Valid To: October 31, 2027 Certificate Number: 3222.01 In recognition of the successful completion of the A2LA evaluation process, accreditation is granted to this Reference Material Producer for the production of certified reference materials and reference materials of the following types: I. Certified Reference Materials 1 Certified Reference Material/ Artifact or Matrix Concentration Ranges and Uncertainty Approach Used to Assign Property Values Organic Reference Materials – Pure Organic Compounds in Solvents Acetates Acrylates Alcohols Aldehydes Amides Amines Anilines Aroclors Aromatics (Volatiles) Carbamates Carbonyl-DNPH Derivatives Ethers Free Acid Herbicides Haloacetic Acids Haloethers Halogenated Alkanes Halogenated Alkenes Herbicide Methyl Esters High Boiling Point Fuels Ketones Low Boiling Point Fuels Methyl Esters n-Alkanes Concentration Range: 0.001 ng/mL to 100 000 µg/mL Certified Expanded Uncertainty Range: (1.4 to 10.9) % GC/MS GC/µECD GC/FID Gravimetric LC/UV LC/MS Melting Point Refractive Index

(A2LA Cert. No. 3222.01) 12/31/2025 Page 2 of 3 Certified Reference Material/ Artifact or Matrix Concentration Ranges and Uncertainty Approach Used to Assign Property Values Organic Reference Materials – Pure Organic Compounds in Solvents (cont) Nitriles Nitroaromatics Organohalide Herbicides Organohalide Pesticides Organonitrogen Herbicides Organonitrogen Pesticides Organophosphorous Pesticides Oxides Phenols Phthalates Polyaromatic Hydrocarbons (PAHs) Polychlorinated Biphenyls (PCBs) Pyridines Substances of Abuse: Cannabinoids Barbiturates Opiates/Morpholines Benzodiazepines Cocaine/Amphetamines Urons Concentration Range: 0.001 ng/mL to 100 000 µg/mL Certified Expanded Uncertainty Range: (1.4 to 10.9) % GC/MS GC/µECD GC/FID Gravimetric LC/UV LC/MS Melting Point Refractive Index II. Reference Materials1 Reference Material/ Artifact or Matrix Concentration Ranges and Uncertainty Ranges Approach Used to Assign Property Values Organic Reference Materials – Pure Organic Compounds in Solvents Acetates Acrylates Alcohols Aldehydes Amides Amines Anilines Aroclors Aromatics (Volatiles) Carbamates Carbonyl-DNPH Derivatives Ethers Fatty Acids Fatty Acid Methyl Esters Free Acid Herbicides Haloacetic Acids Concentration Range: 0.001 pg/mL to 999 999 µg/mL Gravimetric Expanded Uncertainty Range: (0.6 to 3.1) % Gravimetric or Volumetric

(A2LA Cert. No. 3222.01) 12/31/2025 Page 3 of 3 Reference Material/ Artifact or Matrix Concentration Ranges and Uncertainty Ranges Approach Used to Assign Property Values Organic Reference Materials – Pure Organic Compounds in Solvents (cont) Haloethers Halogenated Alkanes Halogenated Alkenes Herbicide Methyl Esters High Boiling Point Fuels Ketones Low Boiling Point Fuels Methyl Esters n-Alkanes Nitriles Nitroaromatics Organohalide Herbicides Organohalide Pesticides Organonitrogen Herbicides Organonitrogen Pesticides Organophosphorous Pesticides Organotins Oxides Phenols Phthalates Polyaromatic Hydrocarbons (PAHs) Polychlorinated Biphenyls (PCBs) Pyridines Substances of Abuse: Cannabinoids Barbiturates Opiates/Morpholines Benzodiazepines Cocaine/Amphetamines Urons Concentration Range: 0.001 pg/mL to 999 999 µg/mL Gravimetric Expanded Uncertainty Range: (0.6 to 3.1) % Gravimetric or Volumetric 1 Certified Reference Material and Reference Material manufacturing also occurs at 270 Rolling Ridge Dr, Bellefonte, PA 16823.