Description
Precision matters in analytical titrations. Therefore, Osmosis Scientific offers this Class AS Schellbach Burette. First, the PTFE needle valve provides a major advantage. It operates without grease. Consequently, you never have to worry about sample contamination. Furthermore, the needle design allows for exceptionally fine flow control. This helps you find the exact endpoint of your reaction every time.
We manufacture these burettes from high-quality Boro 3.3 borosilicate glass. This material handles aggressive chemicals with ease. Additionally, the integrated Schellbach stripe removes the risk of parallax errors. The blue line creates a sharp point at the meniscus. As a result, you get faster and more accurate readings.
If you choose the serialized option, we laser-etch a unique serial number onto the glass. This ensures your lab meets strict ISO requirements. Finally, our permanent amber markings stay clear after years of use. This makes our burettes a reliable choice for precision liquid handling.
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, or chemical exposure after delivery.
| Capacity (mL) | Division (mL) | Tolerance (± mL) | Pack of | SKU (Batch Cert.) | SKU (Indiv. Cert.) | Enquiry |
|---|---|---|---|---|---|---|
| 10 | 0.05 | 0.03 | 1 | BAS-PTFE-BC-0010 | BAS-PTFE-IC-0010 | Enquire Now |
| 25 | 0.1 | 0.05 | 1 | BAS-PTFE-BC-0025 | BAS-PTFE-IC-0025 | Enquire Now |
| 50 | 0.1 | 0.05 | 1 | BAS-PTFE-BC-0050 | BAS-PTFE-IC-0050 | Enquire Now |
| 100 | 0.2 | 0.1 | 1 | BAS-PTFE-BC-0100 | BAS-PTFE-IC-0100 | Enquire Now |
Frequently Asked Questions (FAQs)
The PTFE (polytetrafluoroethylene) needle valve offers superior control compared to traditional stopcocks. Because PTFE is self-lubricating, the valve requires no grease, eliminating the risk of contaminating your titrant or clogging the burette tip. It allows for extremely fine, drop-wise adjustment for precise endpoint determination.
A Schellbach stripe is a vertical blue line on a wider white background located on the back of the burette. Due to light refraction, the blue line appears to narrow into two points where it meets the liquid level.
- The Benefit: It creates a clear “arrow” at the meniscus, significantly reducing parallax error and making it easier for different users to get consistent, identical readings.
Yes. For all Class AS volumetric instruments, a 30-second waiting time is required after the titration is complete before taking the final reading. This allows any liquid film adhering to the inner walls to settle, ensuring the volume delivered is precisely what you record.
Since the valve is grease-free, cleaning is simple. The needle valve can be unscrewed and rinsed with distilled water or an appropriate solvent. This design prevents the “freezing” or seizing common with glass stopcocks.
Yes. Class AS burettes are typically supplied with a Batch Calibration Certificate. For laboratories requiring individual traceability (like NABL-accredited facilities), Individual Calibration Certificates linked to a unique serial number on the glass are also available upon request.
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