Are you among the purchasers who believe that ASTM D178 and IEC 61111:2009 electrical panel mat standards are interchangeable? Why am I unable to obtain ASTM D178 mats rather than the IEC 61111:2009 mats that your makers recommend? The classifications and operating voltages of these standards could be the same. Nonetheless, they differ greatly from one another. https://medium.com/@insulatingmat/how-are-iec-61111-2009-and-astm-d178-electrical-panel-mat-standards-different-2c3acebfdfea