AMS2431/4D results from a Five-Year Review and update of this specification with changes to composition (3.2), media condition (3.4), weight (3.5), shape requirements (Table 2), size (3.8), size requirements (Table 5), size (3.9.1), shape (3.9.2), size (4.1.3 and 22.214.171.124), and shape (4.1.4).
Particulate matter (PM)
Also known as: SAE AMS 2431/4
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