The regulations finalized with the nonroad rule modified the sulfur test method requirements. Instead of a designated method, there are now simply performance-based requirements that must be met, allowing the use of multiple test methods (see § 80.580 and 69 FR 39184).
Question and Answer was originally posted at http://www.epa.gov/otaq/diesel/documents/420b06010.pdf
Given the results of the recent ASTM round robin testing comparing the repeatability and reproducibility of the designated ASTM 6428 sulfur test and the alternative ASTM 5453 test, will EPA reconsider the issue and define the more precise ASTM 5453 test m
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