ISO 609:2025 pdf download,Coal and coke — Determination of carbon and hydrogen — High temperature combustion method.
ISO 609:2025 specifies a method to determine the carbon and hydrogen content of coal and coke using a high-temperature combustion approach. In this procedure, a prepared sample is combusted in a controlled atmosphere so that carbon and hydrogen in the material are converted into measurable products. The test setup captures and measures the combustion products—typically carbon dioxide for carbon and water for hydrogen—using instrumentation and measurement steps that allow converting those amounts back into mass percentages of carbon and hydrogen in the original sample. The standard provides guidance on sample preparation, combustion conditions, calibration/verification of the measurement system, calculation steps, and key parameters that affect accuracy and repeatability. By standardizing the combustion and measurement workflow, ISO 609:2025 improves comparability of analytical results between laboratories for coal and coke composition.