Description

Catalogue No.	Size	Bore (mm)
11035/1	12.5	1.5
11035/2	14.5	2.5

The MEDILAB PTFE Key Stopcock for Burettes is a precision-engineered flow-control component that ensures smooth, controlled, and leak-proof liquid delivery during titrations and analytical procedures. It enables accurate dispensing of reagents, making it essential for volumetric analysis and high-precision quantitative measurements. Manufactured with a PTFE key and a Borosilicate Glass 3.3 barrel, this stopcock ensures durability, chemical resistance, and consistent performance in demanding laboratory environments.

Key Features

• Leak-proof PTFE Key for exceptionally smooth, low-torque operation.
• Precision-machined component ensuring accurate reagent flow control during titration.
• Made from Borosilicate Glass 3.3, providing excellent thermal and chemical stability.
• Interchangeable design suitable for most standard burettes.
• High-transparency glass body for easy viewing of reagent movement.
• Resistant to acids, alkalis, solvents, and oxidising agents.
• Long service life with minimal wear due to PTFE’s non-stick, self-lubricating properties.
• Ideal for high-accuracy volumetric analysis in professional laboratories

Material Specifications

Body Material: Borosilicate Glass 3.3
Key Material: CNC-machined Virgin PTFE

Properties:

• Thermal Resistance: Stable across wide temperature ranges; minimal expansion.
• Chemical Resistance: Non-reactive to most laboratory chemicals and corrosive reagents.
• Mechanical Strength: Strong, durable, shock-resistant glass barrel.
• PTFE Key: Excellent sealing, non-absorbent, and self-lubricating.

Standards: Borosilicate Glass per Dimensional conformity with standard

Technical Specifications

• Type: Stopcock for Burette (Straight Bore)
• Sizes Available: As per the standard size table
• Tolerance: Precision-machined PTFE key for minimal leakage and maximum flow accuracy
• Operating Range: -20°C to +200°C for glass; PTFE usable up to approx. 250°C
• Joint/Connection: Fits standard burette barrels and laboratory stands
• Accessories (Optional): Spare PTFE keys, O-rings (if required), custom-sized stopcock assemblies

Handling & Precautions

• Insert and rotate the PTFE key gently to avoid stress on the glass.
• Clean using mild detergents or compatible solvents; avoid abrasive tools.
• Autoclavable; allow gradual temperature changes to prevent thermal shock.
• Do not expose to open flames or sudden temperature fluctuations.
• Avoid overtightening the key. PTFE is self-sealing and operates best with light pressure.
• Rinse thoroughly after use with corrosive solutions to maintain key performance.
• Store in a dry environment to prevent dust accumulation and ensure smooth operation.

Applications

Ideal for:

• Analytical Chemistry Laboratories – accurate titrations and volumetric analysis
• Pharmaceutical & Biotech Facilities – reagent dispensing and QC workflows
• Chemical Industries – precision liquid delivery for testing and formulation
• Universities & Research Institutions – academic titration experiments and practical lab sessions
• QA/QC Laboratories – standard solution dispensing and quality testing workflows

Its precise control and chemical durability make it indispensable in laboratories where accuracy and reliability are critical.