Kit 2 Round-Bottom Borosilicate 3.3 Flasks 250 ml with Cork Support Ring

Kit of two 250 ml spherical flasks in borosilicate 3.3 glass, plus one compressed cork support ring. Round bottom, narrow neck, ungraduated. Spherical geometry distributes heat uniformly — a key advantage in prolonged boiling and mantle heating.

Kit Contents

• Flasks: 2 units, 250 ml each
• Support ring: 1 unit, compressed cork
• Support ring outer diameter: 100 mm
• Support ring inner diameter: 48 mm

Flask Specifications

• Material: Borosilicate 3.3 glass
• Capacity: 250 ml
• Bottom: Round, ungraduated
• Neck: Narrow, no ground-glass joint
• Wall: Uniform thickness — even heat distribution

Applications

Boiling and heating of liquids in chemistry, teaching and research laboratories. The round bottom eliminates dead zones where heat accumulates — safer than a conical flask when working with direct flame or heating mantle.

The cork support ring keeps the flask stable on the bench without requiring a metal ring stand. Also useful for temporary sample storage between protocol steps.

Technical Data

• Flask material: Borosilicate 3.3
• Nominal volume: 250 ml
• Bottom type: Round
• Graduation: None
• Support ring: Compressed cork, Ø ext. 100 mm / Ø int. 48 mm
• Units included: 2 flasks + 1 support ring