All Magnaflux penetrants certified to AMS 2644 have been tested and verified to be thermally stable. Rest assured that if your QPL approved Magnaflux penetrant is exposed to a long period of extreme hot or cold temperatures, simply allowing the penetrant to completely return to ambient temperature is the only step required before beginning to inspect with the penetrant. Large quantities of penetrant may require a significant amount of time to return to room temperature. Drums or totes of penetrant subjected to extreme cold or heat should be moved to the inspection area 24 hours in advance to ensure uniformity before usage.
Published August 11, 2020