Friction Bar Glass

Product Code : SCL-EI-10641

The Friction Bar Glass is a reusable electrostatics teaching rod manufactured and exported by Lab Glassware Manufacturer, based in Ambala, Haryana, India, in continuous operation since 1982. This glass friction bar is supplied to school physics laboratories and STEM programmes across South Asia, including Nepal, Bangladesh, Sri Lanka, and Bhutan, supporting classroom demonstrations of static charge generation, attraction, and repulsion.

Quick answer: The Friction Bar Glass is a glass rod that generates static charge when rubbed with silk, becoming positively charged (the silk becomes negatively charged) — a classic classroom demonstration of triboelectric charging. It is commonly used with pith balls, an electroscope, or a hard-rubber friction bar for comparison. Final length, diameter, glass type, end finish, and included accessories should be confirmed with Lab Glassware Manufacturer before publication or tender submission.

Key Features

• Glass friction bar for static electricity and electrostatics experiments.
• Useful for teaching charging by friction, charge transfer, attraction, and repulsion.
• Commonly used with silk cloth, electroscopes, pith balls, and electrostatics kits.
• Helps students compare glass-rod charging with hard rubber or plastic rods.
• Reusable apparatus for supervised school physics and STEM demonstrations.
• Simple rod format supports quick classroom setup and repeated practical use.
• Suitable for teacher demonstrations, science fairs, and student laboratory activities.

What's Included

• 1 x Friction Bar Glass
• Protective packing for storage and dispatch
• Optional silk cloth, pith balls, electroscope, stand, or activity guide only if specified in the order

Applications / Uses

• Generating static charge by rubbing glass with silk or a compatible material.
• Demonstrating electrostatic attraction and repulsion.
• Showing charge transfer and charge detection with an electroscope.
• Comparing positive and negative charging effects using different rods.
• Supporting school practical work on static electricity and electrostatics.
• Pairing with Safety Protective Wears and related scientific lab products for structured laboratory activities.

How to Use the Friction Bar Glass

1. Place the glass friction bar and silk cloth on a clean, dry laboratory bench.
2. Ensure both materials are dry, because moisture reduces static charge buildup.
3. Hold one end of the glass bar and rub the other end with silk several times.
4. Bring the charged glass bar near paper pieces, pith balls, or an electroscope.
5. Observe attraction, repulsion, or electroscope leaf movement as per the experiment.
6. Discharge the bar safely and store it after the activity.

Safety note: Handle glass carefully to avoid breakage. Use only for low-energy school electrostatics experiments and keep it away from wet benches, impact, flames, and high-voltage apparatus not designed for student use.

Care & Maintenance

• Store the glass bar in a padded, dry, labelled box after use.
• Keep the surface clean, dry, and free from oil, dust, and laboratory chemicals.
• Clean gently with a soft dry cloth; do not use abrasive cleaners.
• Replace the bar if it becomes cracked, chipped, scratched, or unsafe to handle.

Comparing Glass and Hard Rubber Friction Bars

The Friction Bar Glass and the Friction Bar (Hard Rubber) are commonly used together to demonstrate opposite charging behaviour in the classic triboelectric-series experiment: a glass rod rubbed with silk becomes positively charged, while a hard rubber rod rubbed with fur or wool becomes negatively charged. Running both demonstrations side by side lets students compare positive and negative charging effects using different rods, and observe how the two oppositely-charged bars attract each other while two bars of the same material repel. Schools setting up a fuller electrostatics teaching sequence can also add the Electrostatics Starter Kit and the Friction Skin for Electrostatic Experiments for additional triboelectric charging comparisons.

Why Choose Lab Glassware Manufacturer

Lab Glassware Manufacturer supplies educational laboratory products for schools, colleges, universities, science laboratories, and institutional procurement projects across Nepal, Bangladesh, Sri Lanka, Bhutan, and other South Asian markets. The company supports laboratory glassware, physics apparatus, electrostatics accessories, STEM teaching aids, and classroom demonstration equipment. Buyers can source the Friction Bar Glass for school tenders, electrostatics kits, physics labs, and export-oriented educational supply requirements.

Frequently Asked Questions

What is a Friction Bar Glass used for?
A Friction Bar Glass is used to generate static charge by friction in school physics experiments. It helps demonstrate charge transfer, attraction, repulsion, and electroscope response.

What material is used to rub the glass bar?
A glass friction bar is commonly rubbed with silk cloth in electrostatics demonstrations. The supplied friction material should be confirmed if it is included in the kit.

Does a glass rod become positive or negative when rubbed with silk?
In standard classroom electrostatics demonstrations, a glass rod rubbed with silk becomes positively charged, while the silk becomes negatively charged.

Is the glass friction bar suitable for school students?
Yes. It is suitable for supervised school and STEM experiments when handled carefully and used in dry laboratory conditions.

Does the bar include an electroscope or pith balls?
The standard listing should be treated as the glass friction bar only, unless an electroscope, pith balls, silk cloth, or full electrostatics kit is specifically mentioned.

What details should be confirmed before purchase?
Confirm bar length, diameter, glass type, end finish, quantity, packaging, and whether silk cloth or electrostatics accessories are included — check the product specifications before ordering.

Related Products

• Friction Bar (Hard Rubber)
• Electrostatics Starter Kit
• Friction Skin for Electrostatic Experiments

Request a Quote

For pricing, minimum order quantity, and export documentation for the Friction Bar Glass, please contact us or submit your requirement via our lab tender page. Indicative pricing is available on request and is quoted as an indicative market benchmark (incl. GST) for Indian buyers, or as a dated indicative FOB/CIF range for export orders.

Last updated: September 2026