DURAN Flasks Flat Bottom Narrow NeckRound form, flat bottom boiling flask to ISO 1773:1997; made from DURAN borosilicate glass 3.3 to ISO 3585:1998; glass class 1 to USP, EP & JP.
Tightly controlled glass quality, wall thickness and geometry ensure high resistance to thermal shock giving long service; very resistant to chemical attack. Suitable for direct and indirect heating. With marking label.
* 2, 3 & 5 litre sizes are additional to ISO 1773:1997
Wide mouth versions are available upon request.