Borosilicate Burette with Rota Stopcock

Product Code : SCL-LG-12004

The Borosilicate Burette with Rota Stopcock is a graduated volumetric glass instrument used for dispensing precise, measured volumes of liquid reagents during chemical analytical procedures. Designed for analytical chemists, laboratory technicians, and science educators, this device enables highly controlled drop-by-drop fluid delivery for accurate neutralization and titration calculations.

Product Description

The Borosilicate Burette with Rota Stopcock 50mL from Science Lab Supplies delivers exceptional fluid modulation and reliability for strict quantitative analysis. Fabricated from premium Borosilicate 3.3 glass, the barrel provides an expansion-resistant, heavy-walled structure that withstands aggressive acids, bases, and organic solvents. The clear, durable ceramic graduation marks are permanently fused to the glass surface, ensuring easy volume tracking without risk of degradation from chemical exposure.

This high-performance volumetric instrument is equipped with an integrated PTFE Rota stopcock assembly, commonly referred to as a Rotaflow style key. This advanced screw-turn mechanism offers precise needle-valve control, allowing operators to achieve single-drop accuracy without the need for traditional stopcock grease. As a core tool within our advanced laboratory glassware catalog, this fully reusable burette minimizes standard operational errors, making it a valuable addition to industrial research facilities, testing clinics, and university laboratory benches.

Key Features

• Premium Material Quality: Manufactured from low-expansion Borosilicate 3.3 glass to guarantee optimal chemical durability and structural strength.
• Grease-Free Rota Stopcock: Features a precision PTFE screw-thread key that eliminates the need for lubricating grease, preventing chemical sample contamination.
• Fine Fluid Control: The needle-valve style Rota stopcock ensures smooth micro-adjustments for flawless drop-by-drop delivery during critical endpoints.
• Class A Precision Calibrations: Calibrated to meet strict Class A volumetric tolerances, delivering repeatable accuracy across professional testing procedures.
• High-Contrast Markings: Adorned with sharp, permanent white enamel graduations that remain fully legible over prolonged laboratory usage cycles.
• Autoclave Compatible Barrel: The borosilicate glass barrel safely undergoes thermal sterilization up to 140°C when detached from the plastic stopcock components.

Technical Specifications

What's Included in the Kit

• 2 x Borosilicate Burette Barrel 50mL
• 2 x Complete PTFE Rota Stopcock Screw Assemblies
• 1 x Volumetric Alignment & Usage Instruction Sheet

Applications / Uses

• Conducting highly precise acid-base neutralizations and redox titrations in analytical chemistry.
• Preparing exact chemical working standards and standard dilutions inside testing facilities.
• Operating as a primary fluid delivery device within specialized volumetric instruments configurations.
• Equipping high school, undergraduate, and postgraduate science labs using core elements from our durable science kits.
• Dispensing volatile reagents or hazardous organic solvents safely within industrial manufacturing quality control setups.

How to Use the Borosilicate Burette with Rota Stopcock 50mL

1. Mount the burette barrel vertically into a secure burette clamp attached to a stable laboratory ring stand.
2. Check the PTFE Rota stopcock assembly to ensure the screw key moves smoothly and is turned fully clockwise to the closed position.
3. Place a waste beaker underneath the tip and fill the burette with your titrant solution slightly above the zero mark using a small glass funnel.
4. Turn the Rota stopcock counter-clockwise slowly to flush out any air bubbles trapped in the lower tip, then lower the fluid meniscus exactly to the 0.00 mL line at eye level.
5. Regulate the fluid flow rate during titration by adjusting the screw key, allowing the liquid to drain smoothly under gravity into your analyte flask.

Handling Note: Do not over-tighten the PTFE Rota key when closing the valve. Excessive force can strip the internal plastic threads or fracture the surrounding glass housing.

Care & Maintenance

• Immediate Flushing: Wash the inner bore thoroughly with distilled water immediately after completing titrations to prevent chemical scaling or crystallization.
• Stopcock Storage: Loosen the PTFE screw-thread slightly when the burette is stored for extended periods to relieve internal compression on the glass joint housing.
• Vertical Positioning: Dry the clean glass instruments completely and store them inverted or vertically within a dedicated rack to prevent dust accumulation and physical chipping.

Why Choose Science Lab Supplies

Science Lab Supplies is an established global manufacturer and exporter of precision laboratory instruments, didactic models, and STEM educational equipment. Leveraging decades of rigorous engineering experience, we deliver highly reliable glassware that adheres strictly to international calibration and safety protocols. Our robust distribution infrastructure ensures seamless global supply capabilities to meet large-volume orders from academic institutions, commercial laboratories, and state testing centers. Alongside our premium glass portfolios, we produce an extensive line of durable laboratory plasticware components to fully support your facility's operational requirements.

Frequently Asked Questions

What is a Borosilicate Burette with Rota Stopcock 50mL used for?

It is used to measure and dispense exact volumes of liquid reagents during chemical titrations. The integrated Rota stopcock allows lab technicians to control the fluid discharge down to single drops, which is vital for locating precise reaction endpoints.

What are the benefits of a Rota stopcock over a traditional stopcock?

A Rota stopcock uses a screw-in PTFE key that provides smoother, needle-valve fluid regulation. Unlike traditional glass plugs, it is completely grease-free, which eliminates sample contamination and prevents the valve from freezing or locking up.

Is the glass barrel safe for autoclave sterilization?

Yes, the Borosilicate 3.3 glass barrel can be safely autoclaved up to 140°C. However, the PTFE stopcock screw components should be removed before autoclaving to avoid thermal expansion deformation of the plastic threading.

What does Class A accuracy mean for this burette?

Class A accuracy signifies that the instrument is manufactured to the highest international tolerance standards, providing the lowest possible margin of error for volumetric measurement and reporting.

Does this burette require specialized lubrication?

No, the premium PTFE formulation of the Rota key features an exceptionally low coefficient of friction. It operates completely dry and must never be treated with silicone or hydrocarbon laboratory greases.

Discover our complete range of certified measurement tools by browsing our specialized laboratory glassware catalog page today to elevate your testing precision.