Hollow Stoppers

The Hollow Stoppers supplied by Edulabs offer high-performance sealing capability for standard ground joint glassware assemblies. Designed specifically for compatibility with volumetric flasks, mixing cylinders, reaction flasks, and distillation apparatus, these stoppers deliver a leak-tight seal essential for volatile sample containment and accurate solution storage.

Constructed from chemical-resistant borosilicate glass, these hollow stoppers offer high resistance against corrosive chemical reagents, solvents, acids, and aggressive chemicals. The hollow interior design reduces weight while maintaining structural strength, ensuring smooth handling and minimal center-of-mass shift when fitted onto lightweight volumetric glassware.

These stoppers are available in two functional designs: flat bottom (Hexa, flat bottom) and pointed drip tip (Hexa, with tip). The flat bottom design provides a stable resting base when placed upright, while the tipped design allows liquid condensates or splashes to drip smoothly back into the vessel stem without pooling around the ground joint zone.

Featuring an ergonomic hexagonal head, these stoppers offer an easy grip during insertion and removal, even when wearing laboratory safety gloves. The flat hexagonal facets prevent the stopper from rolling off lab benches, reducing accidental glass breakage and cross-contamination risks. Precision ground in conformity with standard N/S taper joint dimensions, Edulabs hollow stoppers provide dependable interchangeability across laboratory glassware systems.

Key Features

• High-purity borosilicate glass construction for optimal chemical durability.

• Precision ground joint taper ensuring leak-tight sealing across standard N/S joints.

• Lightweight hollow design providing balance without compromising strength.

• Ergonomic hexagonal head for firm grip and easy handling.

• Anti-roll hexagonal shape prevents accidental rolling on laboratory work surfaces.

• Available in both flat bottom and tipped bottom configurations.

• Excellent chemical resistance to organic solvents, acids, and bases.

• Fits standard interchangeable ground glass joint sizes (10/19 to 34/35).

• Autoclavable and reusable for long-term laboratory operations.

• Prevents sample evaporation and contamination during storage and mixing.

Technical Specifications

Available Models

Applications

• Sealing volumetric flasks during solution preparation and inversion mixing.

• Closure for ground-joint volumetric mixing cylinders and flasks.

• Reaction flask sealing in organic synthesis apparatus setups.

• Preventing volatile reagent evaporation during chemical storage.

• Distillation assembly port closure and joint capping.

• Analytical sample preservation in quality control processes.

• Solvent containment in chromatography sample preparation.

• Environmental water testing sample container sealing.

• General laboratory ground-joint glassware seal application.

• Educational chemistry laboratory instructional setups.

Note

Edulabs also offers a comprehensive range of laboratory glassware, laboratory plasticware, laboratory chemicals, laboratory instruments, laboratory equipment, scientific apparatus, educational laboratory equipment, and customized laboratory solutions for educational institutions, research laboratories, pharmaceutical industries, healthcare facilities, biotechnology laboratories, environmental testing laboratories, food and beverage laboratories, and industrial quality control laboratories. Contact Edulabs for bulk orders and OEM requirements.