▪ Pass wire insulator alumina beads made by 99.3%-99.7% high purity alumina ▪ Pass wire insulator alumina beads beads max working temperature is 1800C ▪ The quality can pass the SGS and DIN43724/DIN43725/DIN40680 ▪ Pass wire insulator alumina beads can do the 1, 2, 3, 4 or multi holes ▪ Without any burrs and sharp corners ▪ Can provide the free sample for testing qualuty first