Burette with Rota Stopcock – 50ml
Product Code : SCL-CLE-11931
The StemAids 50ml Burette with Rota Flow Stopcock represents an evolution in titrimetric hardware, replacing traditional glass or plug-style stopcocks with a high-performance rotary screw-valve system. This design offers the user unparalleled control over drop-wise delivery, essential for identifying the exact stoichiometric endpoint in analytical chemistry. Manufactured from Grade A Borosilicate Glass 3.3, it is the primary instrument for acid-base titrations, redox determinations, and complexometric assays in advanced academic and industrial laboratories.
Technical Specifications
|
Tender Specification |
OEM Technical Detail |
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Material |
Grade A Borosilicate Glass 3.3 (Expansion 33) |
|
Capacity |
50ml |
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Accuracy Class |
Class AS (Swift delivery/Waiting time) or Class B |
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Stopcock Type |
Rota Flow (Screw-thread PTFE needle valve) |
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Graduation |
Permanent white or blue enamel; 0.1ml sub-divisions |
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Calibration |
Calibrated "To Deliver" (TD/Ex) at 20?C |
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Tolerance |
±0.05ml (for Class AS) |
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ISO Compliance |
Manufactured under ISO 9001:2015 and ISO 385 standards |
Key Pedagogical & Laboratory Outcomes
- Volumetric Interface: Facilitates student understanding of Precision Dispensing. The Rota Flow mechanism allows for a much finer degree of control than a traditional plug, enabling learners to identify the color change of an indicator with single-drop accuracy (≈0.05ml).
- Stoichiometric Quantification: Enables the determination of unknown concentrations; learners apply the burette to calculate molarity through the titration formula:
M1V1=M2V2
- Mechanical Analysis: Supports the analysis of "Frictionless Operation"; students evaluate the benefits of the PTFE screw valve, which requires no grease, thereby preventing sample contamination and "frozen" stopcocks.
- Parallax Evaluation: Allows students to evaluate and minimize measurement errors; the high-contrast graduations against the clear Borosilicate background help learners practice correct meniscus reading techniques.
The Rota Flow Advantage
Traditional glass stopcocks require silicone grease, which can clog the burette tip or react with chemicals. The Rota Flow (or PTFE needle valve) design offers:
- Lubrication-Free Use: The PTFE needle is naturally self-lubricating.
- Fine-Thread Control: The screw mechanism allows the user to "dial in" a specific flow rate, from a continuous stream to a very slow drop rate.
- Easy Maintenance: The stopcock can be completely disassembled for thorough cleaning without the need for specialized tools.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade, reinforced packaging. Burettes are long, delicate instruments; each unit is housed in a rigid protective sleeve and nested in shock-absorbent foam to prevent fracture of the tip or neck during transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and individual calibration certificates for Class AS units.
- Durability: The Borosilicate 3.3 glass body is resistant to "etching" from strong alkalis like Sodium Hydroxide, ensuring the scale remains legible over years of use.
Direct OEM Sourcing Advantages
Procuring StemAids Burettes directly ensures vertical manufacturing control:
- Bore Uniformity: Direct oversight of the glass-drawing process ensures a perfectly cylindrical internal bore, which is the foundation of volumetric accuracy.
- Leak-Proof Needle Seals: We ensure the PTFE needle-to-glass seat is precision-machined to prevent "tip-leakage," a common flaw in lower-quality burettes.
- Direct Factory Inventory: Guaranteed availability of replacement Rota Flow keys and tips to maximize the lifespan of your laboratory equipment.
- Quality Assurance: Every burette is gravimetrically tested across five points of the scale to ensure total compliance with ISO 385 tolerances.