The Terrill Burner for Small-Scale Burning Test (ASTM D5025) supports the following standards: ASTM D5025. Humboldt's Flame Test Burners are designed to be used as ignition sources for small-scale burning tests, such as the UL flame test and other similar test standards. Supplied complete with two 3/8" (9.5mm) ID by 4" (100mm) long mixing tubes for use in the 20mm and 125mm burning tests. Meets ASTM D5025. Provided with two tubes, one to lock out the air intake to produce a high yellow flame and the other can be adjusted for a sharp blue flame.