Available in various sizes, these borosilicate glass round bottom flasks have four vertical necks - one center neck and three side necks which are 90° apart. All necks have Standard Taper outer joints.

Round bottom flask with short neck and outer joint. Available in standard and heavy wall. Heavy wall approximately 30% heavier than standard wall. Used by glassblowers in fabricating single or multi-necked flasks.

With short neck and outer joint. Available in standard and heavy wall. Heavy wall approximately 30% heavier than standard wall.

SYNTHWARE pear shaped, heavy wall, single neck flasks with a standard taper outer joint. All sizes are hand blown from tubing to ensure uniform wall thickness.

SYNTHWARE round bottom boiling flasks with full length standard taper outer joint. All sizes are heavy wall design and are hand blown from borosilicate tubing to ensure uniform wall thickness.

KimCote® plastic-coated single neck flask with a SJ socket joint. Useful as rotary evaporator condensate collection flask or as a replacement for European designation KS 20/35.

SYNTHWARE round bottom, heavy wall, four neck flasks with standard taper outer joints on both the center neck and the angled side necks. All sizes are hand blown from tubing to ensure uniform wall thickness.

SYNTHWARE round bottom, heavy wall, three neck flasks with standard taper outer joints on both the center neck and the vertical side necks. All sizes are hand blown from tubing to ensure uniform wall thickness.

SYNTHWARE round bottom, heavy wall, two neck flasks with standard taper outer joints on both the center neck and the angled side neck. All sizes are hand blown from tubing to ensure uniform wall thickness.

With two vertical necks and a round bottom, these borosilicate glass flasks feature a side neck Standard Taper 24/40 outer joint. The center Standard Taper joint varies with flask capacity.

Two neck, one center and one angled side neck, round bottom flask with standard taper joints. Available in standard wall or heavy wall.

Quartz boiling flask.

Round bottom flask with two socket joints.

Available in various sizes, these borosilicate glass round bottom flasks have three vertical necks with Standard Taper outer joints. The side necks are 180° apart.

SYNTHWARE round bottom, heavy wall, three neck flasks with standard taper outer joints on both the center neck and the angled side necks. All sizes are hand blown from tubing to ensure uniform wall thickness.

SYNTHWARE round bottom boiling flasks with spherical socket joint. All sizes are heavy wall design and are hand blown from borosilicate tubing to ensure uniform wall thickness. These flasks can be used as replacements for the collection flask on rotary evaporators.

Round bottom flask with four necks arranged 3 in-line and one at 90 degrees. 500ml and smaller flasks have angled side necks while larger sizes feature vertical necks. Available in heavy wall.

Ai 2L, 24/40 standard taper joint, heavy wall, round bottom 2-neck flask with one vertical 24/40 neck, and one angled 24/40 side neck. Glass material: high borosilicate glass 3.3.

KIMAX® round-bottomed boiling flask Reinforced tooled top Designed from ASTM Specification E1403, Type II, Class I, requirements Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements

Round bottom, two neck flask. Side neck is angled. Available in standard wall for more rapid heating or heavy duty for mechanical shock resistance.

KIMAX boiling flask with a short joint neck. Designed from ASTM Specification E1403, Type I, Class 4 requirements.

With outer joints with side necks angled. Available fabricated with heavy walls, approximately 30% heavier than regular wall flasks. Round bottom, three neck flask with angled sides. All joints are standard taper. Available in standard and heavy wall.<

Two neck, one center and on vertical side neck, round bottom flask with standard taper joints. Available in standard wall or heavy wall.

Round bottom flasks, three vertical necks, standard taper outer joints, standard and heavy wall. Flasks feature a flare-out directly below the center joint to facilitate cleaning and removal of stir blades.

KIMAX® boiling flask with a short Standard Taper joint neck. Designed from ASTM Specification E1403, Type I, Class IV requirements Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements

Borosilicate Glass Round Bottom Boiling Flasks are designed to give the best combination of thermal shock resistance, physical strength, and resistance to chemical attack.

With long neck and standard taper 24/40 outer joint.

Angled two neck round bottom flask. Two-neck heavy wall flask with 24/40 Standard Taper outer joints Side neck is angled Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements

SYNTHWARE pear shaped, heavy wall, two neck flasks with an angled side neck. All joints are standard taper outer joints. All sizes are hand blown from tubing to ensure uniform wall thickness.

Round bottom flask with four necks arranged 3 in-line and one #7 Ace-Thred neck (ideal for suspending a thermometer or probe) at 90 degrees. The 500ml and 250ml sizes have angled side necks while the larger sizes feature vertical necks. Available in he

Boiling, round bottom flasks with ground glass joints. Our boiling flasks are made from low-expansion borosilicate glass. Feature uniform wall thickness for superior mechanical strength and shock resistance. Ideal for boiling, heating and mixing in the laboratory.