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(A2LA Cert No. 3285.02) 06/03/2026 Page 2 of 5 Certified Reference Material/Artifact or Matrix1, 2 Property Value(s)/Property Identity/Range Approach Used to Assign Property Values Nonferrous Metals Solids, Chips, Powders – Aluminum Alloys Copper Base Alloys Cobalt Base Alloys Nickel Base Alloys Titanium Base Alloys Zirconium Base Alloys Carbide Alloys Gold Elemental Composition for: Carbon Range: (0.0002 to 7.00) % Uncertainty: (0.0001 to 0.1) % Sulfur Range: (0.0002 to 0.002) % Uncertainty: (0.00005 to 0.001) % Oxygen Range: (0.0002 to 54) % Uncertainty: (0.0001 to 1) % Nitrogen Range: (0.0002 to 0.05) % Uncertainty: (0.0001 to 0.01) % Hydrogen Range: (0.0002 to 0.04) % Uncertainty: (0.0001 to 0.01) % Melting Point: Range: (1000 to 1500) °C Uncertainty: (3 to 10) °C Combustion, inert gas fusion or ash fusion using various peer reviewed accepted methods Inorganic Reference Materials – Ores and Minerals Elemental Composition for: Carbon Range: (0.1 to 50) % Uncertainty: (0.01 to 1) % Sulfur Range: (0.1 to 50) % Uncertainty: (0.01 to 1) % Combustion or inert gas fusion using various peer reviewed accepted methods Solid Fuels – Coal and Coke Elemental Composition for: Carbon Range: (60 to 100) % Uncertainty: (0.001 to 3) % Sulfur Range: (0.1 to 7) % Uncertainty: (0.01 to 0.2) % Nitrogen Range: (0.5 to 3) % Uncertainty: (0.01 to 0.3) % Combustion, isoperibol bomb calorimetry and thermogravimetric analysis using various peer reviewed accepted methods

(A2LA Cert No. 3285.02) 06/03/2026 Page 3 of 5 Certified Reference Material/Artifact or Matrix1, 2 Property Value(s)/Property Identity/Range Approach Used to Assign Property Values Solid Fuels – Coal and Coke (cont) Elemental Composition for: Hydrogen Range: (0.1 to 6) % Uncertainty: (0.05 to 0.5) % Ash Range: (0.1 to 15) % Uncertainty: (0.05 to 0.3) % Volatile Matter Range: (0.5 to 50) % Uncertainty: (0.01 to 5) % Combustion, isoperibol bomb calorimetry and thermogravimetric analysis using various peer reviewed accepted methods Organic Reference Materials – Pure Organic Compounds Compounds for Elemental Analysis Elemental Composition for: Carbon Range: (0.01 to 100) % Uncertainty: (0.005 to 0.5) % Sulfur Range: (0.01 to 35) % Uncertainty: (0.01 to 0.5) % Oxygen Range: (5 to 50) % Uncertainty: (0.01 to 0.5) % Nitrogen Range: (4 to 30) % Uncertainty: (0.02 to 0.3) % Hydrogen Range: (2 to 13) % Uncertainty: (0.01 to 0.2) % Gross Calorific Value Range: (11 000 to 12 000) BTU/lb Uncertainty: (6 to 20) BTU/lb LOI Range: (10 to 32) % Uncertainty: (0.01 to 0.2) % Combustion, isoperibol bomb calorimetry and thermogravimetric analysis using various peer reviewed accepted methods Petroleum Products – Fuels and Lubricants Elemental Composition for: Carbon Range: (80 to 90) % Uncertainty: (0.1 to 1) % Combustion and isoperibol bomb calorimetry using various peer reviewed accepted methods

(A2LA Cert No. 3285.02) 06/03/2026 Page 4 of 5 Certified Reference Material/Artifact or Matrix1, 2 Property Value(s)/Property Identity/Range Approach Used to Assign Property Values Petroleum Products – Fuels and Lubricants (cont) Elemental Composition for: Sulfur Range: (0.01 to 6) % Uncertainty: (0.001 to 0.5) % Nitrogen Range: (0.01 to 0.5) % Uncertainty: (0.005 to 0.1) % Hydrogen Range: (11 to 14) % Uncertainty: (0.05 to 0.3) % Gross Calorific Value Range: (18 000 to 20 000) BTU/lb Uncertainty: (5 to 200) BTU/lb Combustion and isoperibol bomb calorimetry using various peer reviewed accepted methods Environmental Reference Materials – Soils Elemental Composition for: Carbon Range: (0.5 to 40) % Uncertainty: (0.02 to 0.5) % Sulfur Range: (0.01 to 0.5) % Uncertainty: (0.001 to 0.5) % Nitrogen Range: (0.1 to 5) % Uncertainty: (0.01 to 0.1) % Combustion using various peer reviewed accepted methods Environmental Reference Materials – Ashes Fly Ash from Coal and Coke, Incinerator Ash Elemental Composition for: Carbon Range: (0.5 to 45) % Uncertainty: (0.05 to 0.6) % Sulfur Range: (0.1 to 2) % Uncertainty: (0.005 to 0.03) % LOI Range: (1 to 32) % Uncertainty: (0.01 to 0.2) % Combustion, thermogravimetric analysis and ash fusion using various peer reviewed accepted methods

(A2LA Cert No. 3285.02) 06/03/2026 Page 5 of 5 Certified Reference Material/Artifact or Matrix1, 2 Property Value(s)/Property Identity/Range Approach Used to Assign Property Values Environmental Reference Materials – (cont) Ashes Fly Ash from Coal and Coke, Incinerator Ash Fusibility Temperature Range: (900 to 1500) °C Uncertainty: (30 to 90) °C Combustion, thermogravimetric analysis and ash fusion using various peer reviewed accepted methods Environmental Reference Materials – Plant Material Elemental Composition for: Carbon Range: (40 to 60) % Uncertainty: (0.02 to 0.5) % Sulfur Range: (0.05 to 2.0) % Uncertainty: (0.005 to 0.05) % Nitrogen Range: (1 to 10) % Uncertainty: (0.02 to 0.07) % Hydrogen Range: (3 to 7) % Uncertainty: (0.05 to 0.2) % Combustion using various peer reviewed accepted methods ________________________ 1 Uncertainties for the certified values are available on the reference material producer’s issued certificates for certified reference materials. 2 This reference material producer is approved to produce Certified Reference Materials (CRM) and Reference Materials (RM) for all items listed on the scope of accreditation. Availability of either a CRM or RM may vary due to production and a customer should ensure they order the product that they require.