WSDOT Materials Manual M 46-01.42 Page 1 of 16 January 2023 WSDOT Errata to FOP for AASHTO T 308 Determining the Asphalt Binder Content of Asphalt Mixtures by the Ignition Method WAQTC FOP for AASHTO T 308 has been adopted by WSDOT with the following changes: Procedure – Method B (External Balance) – Method not recognized by WSDOT. Annex – Correction Factors Asphalt Binder and Aggregate Asphalt binder correction factor – Shall read as below: A correction factor must be established by testing a set of correction specimens for each Job Mix Formula (JMF). Aggregate correction factor - Method not recognized by WSDOT. Procedure Steps 9 – 13 not recognized by WSDOT.