Description
The Glass Burette Class AS with Schellbach Stripe from Osmosis Scientific represents the pinnacle of precision for analytical titration. Manufactured from premium Boro 3.3 borosilicate glass, this burette is engineered to meet the dual requirements of DIN ISO 385 and USP standards, ensuring it is suitable for use in globally regulated pharmaceutical and research environments.
The defining feature of this burette is the Schellbach stripe—a vertical blue line on a broader white background on the rear of the tube. This optical aid creates a sharp “point of contact” at the meniscus, significantly reducing parallax errors and allowing for faster, more accurate readings. Combined with the Class AS rapid-delivery calibration, it ensures the highest degree of reproducibility in high-stakes laboratory workflows.
Equipped with a precision-ground glass stopcock, the burette allows for fine control over drop-wise delivery. Each unit is laser-etched with a unique serial number and is supplied with an Individual Work Certificate, providing the traceable quality assurance required by ISO-certified facilities. The durable amber enamel markings are resistant to aggressive chemicals, making the Osmosis Scientific Burette a dependable staple for any high-functioning laboratory.
Note: For outsourced or certified products, Osmosis Scientific acts as a supplier and distributor. Certification validity, calibration accuracy, and traceability are the responsibility of the original manufacturer or issuing certification body. Osmosis Scientific shall not be held liable for calibration deviations caused by improper handling, physical damage, wear, or chemical exposure after delivery.
| Capacity (mL) | Division (mL) | Tolerance (± mL) | Pack of | SKU | Enquiry |
|---|---|---|---|---|---|
| 10 | 0.05 | 0.03 | 1 | GBAS-GS-0010 | Enquire Now |
| 25 | 0.1 | 0.05 | 1 | GBAS-GS-0025 | Enquire Now |
| 50 | 0.1 | 0.05 | 1 | GBAS-GS-0050 | Enquire Now |
| 100 | 0.2 | 0.1 | 1 | GBAS-GS-0100 | Enquire Now |
Frequently Asked Questions (FAQs)
A Schellbach stripe is a narrow blue line printed on a broader white background on the back of the burette. When looking through the liquid, the blue line appears to narrow into two points where it meets the meniscus.
- Benefit: It creates an unmistakable “arrow” or “point” at the exact level of the liquid, significantly reducing parallax errors and making the meniscus much easier to read accurately.
The “S” in Class AS stands for “Swift” (or Schnell in German). It indicates that the instrument is designed for rapid delivery of the liquid. For Class AS pipettes and burettes, a specific waiting time (usually 15–30 seconds) is required after delivery to allow the liquid film on the glass walls to settle, ensuring the exact volume is delivered.
While PTFE (Teflon) is low-maintenance, a ground glass stopcock is often preferred for:
- Superior Seal: When properly greased, glass-to-glass joints provide a perfectly airtight and leak-proof seal.
- Longevity: Glass stopcocks are highly resistant to physical wear and do not “creep” or deform over time under pressure.
With the Schellbach stripe, you don’t look for the bottom of the curve in the traditional sense; instead, you read the point where the two tapered blue lines meet. Always ensure your eye is at the same level as the meniscus to ensure the most accurate measurement.
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