Straight Hollow Ground Glass Stopper Borosilicate 3.3

LBG
Straight hollow ground glass stopper in borosilicate LBG 3.3. Open central bore allows thermometers, tubes, or stirring rods to pass through without breaking the ground glass seal. Borosilicate 3.3 withstands organic solvents, dilute acids, and standard laboratory working temperatures. Standardised ground joint for a gas-tight fit with flasks, columns, and condensers of the same cone. Essential in distillation, reflux, and synthesis setups where an accessory must pass through the stopper.

In stock

SKU: 21240

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Straight Hollow Ground Glass Stopper Borosilicate 3.3

Borosilicate LBG 3.3 glass stopper with straight central bore. Seals the ground glass joint of a flask or column while leaving a clear passage for thermometers, gas inlet tubes, rods, or any accessory of compatible diameter.

Features

  • Material: Borosilicate glass LBG 3.3
  • Type: Hollow, straight through-bore
  • Seal: Standardised ground glass joint
  • Chemical resistance: Organic solvents, dilute acids, dilute bases

Applications

Distillation and reflux assemblies where a thermometer or inlet tube must pass through the stopper without compromising the seal. Also used in inert atmosphere synthesis — the nitrogen inlet tube runs through the central bore while the ground joint keeps the system closed.

Standard item in organic chemistry, pharmaceutical, and R&D-scale synthesis laboratories.

Compatibility

Fits any standardised ground glass joint of the same cone size. Compatible with round-bottom flasks, Erlenmeyer flasks with ground glass necks, fractionating columns, and laboratory reactors.

Technical Data

  • Material: Borosilicate 3.3 (LBG)
  • Bore: Straight, through-bore
  • Finish: Standardised ground glass
  • Cleaning: Compatible with laboratory dishwashers and common solvents
Brand LBG
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