• Burettes PTFE Key Stopcock Class A - Schellbach Stripe

Burettes PTFE Key Stopcock Class A - Schellbach Stripe

BTPT-SCH-CLA-10

  • Lab and Research

Vendor: OMSONS

Suited For: Lab and Research

Country of Origin: India

30-Day Limited Warranty
This product is covered against manufacturing defects in materials and workmanship for 30 days from the date of purchase.

This warranty does not cover: breakage caused by thermal shock (rapid heating or cooling); physical or mechanical damage, including drops, impacts, chips, and cracks from handling; damage from use outside the glassware's rated temperature, pressure, or chemical compatibility; damage from improper cleaning; normal wear such as scratching, staining, or discolouration; or unauthorised repair or modification.

To claim, contact SmartLabs within 30 days of purchase with proof of purchase and a description of the defect.
12 in stock
R 417.74
R 417.74
Tax included. Shipping calculated at checkout.
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A Class 'A' Schellbach Burette with a PTFE Key represents the gold standard for manual titration. It combines the highest volumetric precision with a specialized visual aid to eliminate parallax errors and ensure consistent meniscus readings.
 
Key Features
  • Schellbach Stripe: A vertical white stripe with a central blue line fused to the back of the burette.
    • The "X" Effect: When viewed through the liquid, the meniscus causes the blue line to appear as two opposing triangles meeting at a point (forming an "X"). You read the volume exactly where the two points touch.
  • PTFE Key Stopcock: Uses a self-lubricating, straight-bore PTFE plug.
    • Benefit: It is 100% grease-free, preventing contamination of your titrant and ensuring the stopcock never seizes.
  • Class 'A' Accuracy: Provides the lowest possible margin of error (e.g., ±0.05 mL for a 50mL capacity).
  • Batch Certificate: Each unit is tested and verified against ISO 385 standards, with a certificate included for your lab's quality compliance (ISO 9001, GLP).
How It Works: The "X" Effect
When you look through a liquid-filled burette, light refraction causes the blue line to distort at the meniscus: 
  • The Visual: The blue line appears to narrow into two opposing triangles or "arrow points".
  • The Reading Point: The precise volume is read at the exact point where these two blue triangles meet, forming an "X" shape. 
 
Key Benefits
  • Parallax Removal: It forces your eye to be at the correct level; if you are looking from above or below, the "X" will not align perfectly with the graduation mark.
  • Enhanced Contrast: The white background makes the meniscus of colorless or clear liquids much easier to see.
  • Precision: By providing a single point of reference (the "X"), it allows for repeatable readings down to 0.01 mL in high-quality Class A burettes.
Usage Tip
To get the most accurate results, always ensure the burette is perfectly vertical in its stand. Even with a Schellbach stripe, an angled burette can introduce subtle measurement errors.

Specifications Table

Code Capacity (ml)  Graduation (ml)  Tolerance (±ml)
BTPT-SCH-CLA-10 10 0.05  ±0.03 
BTPT-SCH-CLA-25 25 0.1  ±0.05 
BTPT-SCH-CLA-50 50 0.1  ±0.05 
BTPT-SCH-CLA-100 100 0.2  ±0.1 

Specifications

  • Compliance: Conforms to ISO 385 Class B standards.
  • Accuracy: Class 'A' Schellbach
  • Certificate: Batch Certificate
  • Material: High-grade Borosilicate 3.3 Glass, providing superior resistance to chemical corrosion and thermal shock.
  • Graduations: Durable Blue (amber on request) enamel graduations.
  • Stopcock Type: Straight Bore with a PTFE (Polytetrafluoroethylene)
  • Brand: OMSONS
  • Product of India

 

 

Specifications

Accuracy: Class A (Schellbach)
Material: Borosilicate 3.3 Glass
Compliance: ISO 385
Tolerance: ±0.03mL (10mL) to ±0.1mL (100mL)
Stopcock: PTFE Straight Bore Key

Delivery

We deliver nationwide across South Africa. Once your order is on its way, you'll receive a tracking link by email so you can follow its progress. If you need your order urgently or you're delivering somewhere hard to reach, contact our team before you check out and we'll help where we can.

Warranty

This product is covered against manufacturing defects in materials and workmanship for 30 days from the date of purchase.

This warranty does not cover: breakage caused by thermal shock (rapid heating or cooling); physical or mechanical damage, including drops, impacts, chips, and cracks from handling; damage from use outside the glassware's rated temperature, pressure, or chemical compatibility; damage from improper cleaning; normal wear such as scratching, staining, or discolouration; or unauthorised repair or modification.

To claim, contact SmartLabs within 30 days of purchase with proof of purchase and a description of the defect.

Our Promise

At SmartLabs, we only stock equipment we'd trust in our own labs and classrooms. If a product arrives faulty or doesn't match its description, let us know and we'll make it right, whether that's a replacement or a refund. Our goal is for every order to work exactly as it should, the first time.