BURETTE WITH PTFE STOPCOCK

Description

This modern burette is the industry standard for analytical titrations, combining the high-precision performance of Borosilicate 3.3 glass with the maintenance-free operation of a PTFE (Teflon) stopcock. These units are specifically shipped in custom-molded foam inserts to provide maximum protection for the barrel and the delivery tip during transit.

Key Product Features

• PTFE (Teflon) Stopcock:

  • Grease-Free: Unlike glass stopcocks, PTFE does not require lubrication. This eliminates the risk of sample contamination and prevents the stopcock from “seizing” or “freezing” over time.

  • Self-Lubricating: Provides exceptionally smooth, effortless rotation for precise drop-by-drop control.

  • Chemical Inertness: Highly resistant to almost all laboratory chemicals, including strong bases like Sodium Hydroxide (NaOH), which can often damage glass stopcocks.

• Borosilicate 3.3 Glass: Offers superior thermal resistance and a low coefficient of expansion, ensuring that the volumetric calibration remains accurate across varying laboratory temperatures.

• Molded Foam Packing:

  • Each burette is cradled in a high-density foam mold that absorbs shocks and vibrations.

  • Zero Breakage Design: The foam ensures the fragile delivery tip and the protruding stopcock handle are never under pressure from the outer packaging.

• High-Visibility Graduations: Features permanent, fired-on enamel markings (available in blue, white, or amber) that are easy to read against the meniscus.

Technical Specifications

Primary Advantages

1. Low Maintenance: The PTFE plug can be easily removed for cleaning and re-inserted without the need for specialized grease.

2. Increased Durability: The foam packing makes these units ideal for high-volume educational orders or long-distance shipping, significantly reducing “dead on arrival” (DOA) rates.

3. Accuracy in Alkaline Titrations: Since PTFE is not affected by alkalis, these burettes are the preferred choice for standard acid-base titrations involving caustic solutions.

Maintenance & Usage Tips

• Assembly: Ensure the PTFE nut is tightened just enough to prevent leaks. Overtightening can make the stopcock difficult to turn, while under-tightening may cause the titrant to drip.

• Cleaning: Use a long-handled burette brush and a mild laboratory detergent. The PTFE plug should be rinsed separately to ensure no particulates are trapped in the bore.

• Storage: After use, it is best to store the burette vertically. If storing in its foam box, ensure it is completely dry to maintain the integrity of the foam and the glass.

Why Choose the PTFE Version?

The PTFE Stopcock is widely considered a significant upgrade over traditional glass. Its non-stick, grease-free nature saves time in the lab and ensures that your titrations are never compromised by lubricant residue. Combined with professional foam packing, this burette is a reliable, high-performance tool for any modern laboratory.