Ostwald Viscometer
Product Code : SCL-CLE-11910
Quick Answer: The Ostwald Viscometer is a U-shaped borosilicate glass viscometer with a bulb, a fine capillary and two etched marks, used to find the viscosity of a liquid from its flow time.
Last updated: 18 October 2026
Key Features
- U-tube design with a bulb and a fine-bore capillary arm.
- Two permanent etched marks, upper and lower.
- Capillary designed for laminar flow.
- Sizes 1, 2 and 3 for different viscosity ranges.
- Fits standard laboratory clamps and water baths.
Technical Specifications
| Specification | Value |
|---|---|
| Material | Borosilicate glass 3.3 |
| Design | U tube with bulb and capillary |
| Marks | Two etched (upper and lower) |
| Sizes | 1, 2, 3 |
| Mounting | Laboratory clamp, water bath |
How It Is Used
The time taken for the meniscus to fall from the upper to the lower mark is measured and compared with the time for a reference liquid, giving the sample's viscosity relative to it. The viscometer must hang perfectly vertical, sit in a water bath at a steady temperature and be chemically clean, because tilt, temperature changes or dirt in the capillary all upset the timing.
Frequently Asked Questions
How is the Ostwald Viscometer used?
The flow time of the liquid between the upper and lower marks is measured and compared with that of a reference liquid to calculate relative viscosity.
Why must the Ostwald Viscometer be kept in a water bath?
Viscosity depends strongly on temperature, so the viscometer is kept in a stabilised water bath while readings are taken.
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Export orders for the Ostwald Viscometer are accepted from schools, colleges and distributors in Kuwait, Estonia, Italy, Ghana and Zambia.
For a quotation on the Ostwald Viscometer, contact JLab India on +91-8569909696.
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