These 250ml quality flat bottom boiling flasks are made from borosilicate glass, and are heat resistant. They have a narrow mouth, a tooled top finish, and thick walls.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.