Jacket reaction Flask 

With 24/40  main joint,the other necks could be customized 

Made of borosilicate glass

Made by hand blower

Be Made From G3.3 Borosilicate Glass

Annealing Point ------560℃

Linear Coefficient of Expansion------ 32×10-7/℃

Softening Point------820℃

All of our glassware made by the glass blowers,not the poor glass,Please do not make the comparison with other's glass