Pipette Dropping Glass - Single 125mm Glass Pipette with Rubber Teat

A 125mm Glass Dropping Pipette is a standard laboratory tool used for the controlled, drop-wise transfer of liquids. It consists of a narrow glass tube tapered to a fine tip and topped with a replaceable rubber teat (bulb).

Key Features

• Dimensions: The 125mm length (approx. 5 inches) is the ideal "short" size for extracting liquids from standard reagent bottles or test tubes.
• Material: The body is made of borosilicate or soda-lime glass, making it resistant to most chemicals and easy to sterilize.
• Rubber Teat: A flexible bulb that creates the vacuum needed to draw up liquid. These are usually made of natural rubber or silicone and can be removed for cleaning.
• Controlled Delivery: The tapered tip is designed to deliver uniform drops, which is essential for qualitative analysis and indicator testing.

Common School Applications

• Indicator Addition: Adding drops of phenolphthalein or litmus solution during titrations.
• Micro-Chemistry: Mixing small volumes of reactants in a spot plate.
• Microscopy: Placing a single drop of water or stain onto a slide before applying a coverslip.
• Staining: Applying methylene blue or iodine to biological specimens like onion skin cells.

Maintenance and Care 

• Cleaning: To prevent cross-contamination, the glass tube and rubber teat should be separated and washed thoroughly after each use.
• Storage: Avoid storing the pipette with liquid inside the rubber teat, as chemicals can degrade the rubber over time.
• Safety: Always check the glass tip for chips or cracks before use to avoid injury or inaccurate drop sizes.

 Spesification

• Material: Clear and Ruber
• Size: 125mm
• Volume: A standard 125mm glass dropping pipette has an approximate capacity of 1.5ml to 2.0ml.
• Teat: Rubber
• Printing: None
• Product of India
• For a standard 125mm glass dropping pipette, the average drop count is approximately 20 drops per millilitre (ml).

This is a common "rule of thumb" in science labs, though the exact number can vary based on:

• Liquid Viscosity: Thicker liquids (like oils or glycerin) produce larger, fewer drops.
• Surface Tension: Soapy water or alcohol will produce much smaller, more frequent drops than pure water.
• Tip Diameter: If the glass tip is chipped or wider than standard, the drops will be larger, decreasing the count per ml.

Pro-Tip for Labs: If you need high precision, it’s a great introductory exercise to have students calibrate their own pipettes by counting how many drops of water it takes to reach the 1ml or 5ml mark in a graduated cylinder.