borosilicate glass rod

high borosilicate glass rod: Material:borosilicate 3.3 working temperature:450-500C softening point:820C below are the physical and chemical features of the borosiliicate glass rod 1>regular diameter of the glass rod is 14mm-50mm,the length is free.besides,we can customize the unconventional specifications according to customers' demand.the color is clear 2>under the condition of 20-300,coefficient of mean limear expansion is 3.3±0.1(10-6k-1) 3>transformation temperature is 525oC±15,when the temperature is heated up to 820oC,it will be softening but not crack. 4>water resistance is ISO719-HGB198,ISO720-HGA1121 5>acid resistance class is ISO1776-1 6>alkali resistance class is ISO695-A2 advantage: 1>a kind of material with high temperature resistance 2>it's well material for lens,lamps,and so on 3>other high grade glassware usage