Burette with Glass Stopcock – 50ml
Product Code : SCL-CLE-11932
The StemAids 50ml Burette with Glass Stopcock is the definitive instrument for classical volumetric analysis. Featuring a precision-ground, interchangeable glass plug, this burette is favored in environments where total chemical inertness is required and where students are taught the fundamental manual techniques of titration. Manufactured from high-expansion Borosilicate Glass 3.3, it provides a clear, high-contrast scale for the exact measurement of liquid titrants.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Material |
Grade A Borosilicate Glass 3.3 (High Chemical Resistance) |
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Capacity |
50ml |
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Accuracy Class |
Class AS (Swift delivery with wait time) or Class B |
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Stopcock Type |
Precision-ground Glass Plug (Interchangeable) |
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Graduation |
Permanent amber 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 (Class AS) or ±0.10ml (Class B) |
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ISO Compliance |
Manufactured under ISO 9001:2015 and ISO 385 standards |
Key Pedagogical & Laboratory Outcomes
- Volumetric Interface: Facilitates the understanding of Stoichiometric Precision. The 0.1ml graduations allow learners to identify and interpolate the volume of titrant used to within 0.02ml of accuracy.
- Manual Dexterity Application: Enables the mastery of Titration Technique; learners apply the "two-hand technique" (one for the stopcock, one for swirling the flask) to achieve perfect drop-wise control.
- Chemical Compatibility Analysis: Supports the analysis of "Total Inertness"; the all-glass construction allows students to evaluate reagents that might degrade or permeate plastic valves.
- Maintenance Evaluation: Provides a pedagogical platform for evaluating laboratory upkeep; students learn the necessity of properly "greasing" the stopcock to ensure a vacuum-tight seal and smooth rotation.
The Glass Stopcock Standard
While modern PTFE valves are common, the classic glass stopcock remains a staple for:
- Total Chemical Purity: Zero contact with polymers or synthetic seals.
- Durability: Ground-glass joints, when properly maintained, offer a lifetime of service without the "creep" associated with some plastics.
- Traditional Skillset: Teaching students how to apply a thin, uniform layer of stopcock grease is a foundational skill in professional analytical training.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade, reinforced packaging. The burette and its matched glass stopcock are secured to prevent the plug from falling out or cracking the barrel during transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and individual calibration reports for Class AS units.
- Durability: Every burette undergoes an annealing process to remove internal stress, making the tip—the most fragile part—remarkably resilient to thermal and mechanical shock.
Direct OEM Sourcing Advantages
Procuring StemAids Burettes directly ensures vertical manufacturing control:
- Diamond-Ground Precision: Direct oversight of the grinding process ensures that the stopcock plug and the barrel match perfectly, preventing "seepage" even with low-viscosity liquids.
- Matched Serial Numbers: We ensure that Class AS plugs and barrels are matched and numbered at the factory for guaranteed volumetric accuracy.
- Direct Factory Inventory: Guaranteed availability of replacement glass stopcocks and specialized burette cleaning brushes.
- Quality Assurance: Every unit is tested for leak-rate and flow-consistency to ensure it meets the rigorous demands of ISO 385.