Bell Jar lab

Bell Jar lab

Bell Jars are transparent borosilicate glass domes used to enclose objects under low-pressure conditions or controlled atmospheres. Sitting over a base plate with a ground glass flange, these jars are ideal for vacuum experiments, demonstrations, and protective containment in academic, research, and industrial labs.

They can also serve as protective domes for sensitive instruments, sensors, or specimens and are used for teaching, display, or museum purposes. Custom options such as side ports, viewing windows, or thicker walls are available to accommodate specific lab requirements.

Technical Specifications

Parameter	Specification
Material	Borosilicate Glass 3.3
Temperature Range	Ambient to ~120–150 °C
Operating Pressure	Low vacuum (modest pressure reductions), not for high vacuum or high positive pressure
Diameter	100 mm – 500 mm or more (customizable)
Height	Varies with diameter and model
Flange Type	Ground glass base flange for sealing to base plates
Seal Method	Ground flange with vacuum grease or O-ring for low vacuum
Optional Features	Side ports, viewing windows, thicker walls for stress reduction
Use Limitations	Not suitable for deep vacuum or high mechanical stress

Key Features

• Transparent borosilicate glass for clarity and chemical resistance
• Ground flange ensures secure sealing on base plates
• Customizable sizes for diameter, height, and wall thickness
• Optional side ports or viewing windows for experimental setups
• Ideal for low vacuum and low-stress laboratory applications
• Protects specimens, instruments, or experiments from environmental contamination
• Suitable for teaching labs, demonstrations, and display purposes

Applications

• Vacuum demonstrations: sound propagation, atmospheric pressure effects
• Enclosure of sensitive specimens or instruments under controlled atmospheres
• Protective dome over samples, sensors, or laboratory apparatus
• Teaching labs or museum display for inert or dust-free environments
• Partial vacuum experiments for educational or low-pressure laboratory tasks

Frequently Asked Questions (FAQ)

Q1. Can bell jars be used for high vacuum?
No. These are designed for low to modest vacuum applications; high vacuum may stress the glass.

Q2. Are they compatible with chemical reagents?
Yes, borosilicate glass 3.3 is chemically resistant to most laboratory chemicals.

Q3. Can custom sizes or ports be added?
Yes, side ports, viewing windows, thicker walls, and larger diameters are available upon request.

Q4. How is the vacuum seal achieved?
Through a ground glass base flange, typically using vacuum grease or an O-ring for low-pressure experiments.

Why Choose Our Bell Jars?

• Industrial-quality borosilicate glass 3.3
• Transparent dome for clear observation of samples
• Secure ground glass flange seal for low-pressure experiments
• Customizable diameters, heights, and wall thicknesses
• Perfect for academic labs, R&D, and demonstration setups