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 ISO 3585
- Dimensional conformity with standard DIN/ISO burette specifications
Technical Specifications
- Type: Stopcock for Burette (Straight Bore)
- Sizes Available: Compatible with standard burette capacities (10 ml, 25 ml, 50 ml, 100 ml)
- 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
Packaging:
- Individually packed
- Export-grade cushioning
- Bulk packaging available for distributors
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.
Why Choose MEDILAB
- 35+ years of expertise in laboratory glassware manufacturing
- Supplying to 40+ countries with a trusted global footprint
- Export-quality production standards ensure durability and performance
- OEM & Private Labelling options for brands and distributors
- Consistent quality assurance backed by stringent inspections
- Robust, safe packaging designed for worldwide transportation
- Reliable global supply chain supporting laboratories, distributors, and industrial users
