One of the QC standards, Methylcyclohexane (MCH), has been determined to suffer from contamination such as peroxides which lower the ignition delay (ID) of this QC fuel. Much effort has been put into cleansing of this material, but the contaminants affect the ability of the users of this test method to distinguish between instrument problems or QC fuel contamination. A suitable alternative QC fuel was determined to have similar ignition delay (ID) range which does not suffer the affects of this contamination. This fuel was examined by several users on their own equipment and found it to be a suitable alternative to MCH. The robustness study was examined by the chair of precision and the Site Expected Values (SEV) were determined. Subsequently an approach in accordance with D6299 was proposed for ballot in D7170 to address this alternative QC fuel. The sections affected by this proposed change are section 8 (Reagents and Materials)and Section 11 (Calibration and Quality Control Testing).
Citing ASTM Standards
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