PRODUCTS
BS U-Tube viscometers for transparent liquids
BS/U-Tube viscometers for transparent liquids
BS/U-Tube viscometers for transparent liquids are precision glass capillary instruments designed for accurate and repeatable kinematic viscosity measurements of transparent Newtonian liquids in laboratory and quality control environments.
Manufactured from high-quality borosilicate glass, these viscometers comply with internationally recognised ASTM, ISO and UNE standards, providing reliable viscosity measurements together with full calibration traceability.
Each instrument includes an individual calibration certificate with constant values at 40°C and 100°C, making it suitable for laboratories that require dependable and repeatable measurement results.
Our products
Kinematic Viscometer Types
BS/U-Tube & BS/IP/RF U-Tube
BS/U-TUBE VISCOMETERS FOR TRANSPARENT LIQUIDS
BS/U-Tube Viscometers for Transparent Liquids
BS, ASTM D-445, D446, ISO 3104, ISO 3105 and UNE 400313
Made of borosilicate glass, and non-alterable timing marks. With constant value at 40ºC and 100ºC into the calibration certificate. Precision: ±0.2%.
BS/IP/RF U-TUBE REVERSE FLOW VISCOMETERS FOR OPAQUE LIQUIDS
BS/IP/RF U-Tube Reverse Flow Viscometers for Opaque Liquids
BS-IP-RF, ASTM D-445, D446, ISO 3104, ISO 3105 and UNE 400313
Made of borosilicate glass, and non-alterable timing marks. With constant value at 40ºC and 100ºC into the calibration certificate.
Precision: ±0.3%.
All capillary viscometers are supplied with the calibration certificate issued in accordance with the conditions of accreditation granted by a National Metrological Register which has assessed the measurement capability of the laboratory, the test uncertainty and its traceability to recognized international standards UKAS.
Accessories
Today’s business world brings new challenges that demand innovative solutions. Fungilab’s aim, as a leading viscosity technology company, is to become an expertise partner in the viscosity world to offer you our best products and services.
To provide you and your customers with this necessary attention and an expertise support, Fungilab offers a wide range of products for the measuring of the kinematic viscosity of your products.
Our kinematic series include: the Höppler viscometer (falling ball), for the measurement of the low viscosity liquids in all industries; capillary viscometer series and baths, in accordance to ASTM and DIN methods, to obtain the most accurate viscosity of your liquids; and flow cup viscometers, suitable for paints, inks, varnishes and similar products.
Kinematic viscosity is a measure of a fluid’s resistance to flow under the influence of gravity. It’s defined as the ratio of the fluid’s dynamic (absolute) viscosity to its density. In other words, it describes how thick or thin a fluid is without the involvement of any external force except gravity.
Capillary viscometers for transparent Newtonian liquids
The BS/U-Tube viscometer is designed for determining the kinematic viscosity of transparent Newtonian liquids using the capillary method. Manufactured from precision borosilicate glass, it provides highly repeatable measurements for laboratory testing, quality control and research applications.
The design incorporates permanent timing marks and individually calibrated constants, helping laboratories achieve reliable viscosity measurements with excellent long-term stability.
Applicable international standards
Fungilab BS/U-Tube viscometers for transparent liquids are manufactured according to internationally recognised testing standards, including:
- ASTM D445
- ASTM D446
- ISO 3104
- ISO 3105
- UNE 400313
Main characteristics
- Manufactured from borosilicate glass.
- Designed for transparent Newtonian liquids.
- Permanent, non-alterable timing marks.
- Measurement precision of approximately ±0.2%.
- Calibration certificate with constant values at 40°C and 100°C.
- Suitable for laboratory quality control and research applications.
Calibration and traceability
Every BS/U-Tube viscometer is supplied with an individual calibration certificate issued under the accreditation requirements of a National Metrological Register. The certificate guarantees measurement capability, uncertainty evaluation and traceability to internationally recognised UKAS standards.
Accurate capillary viscosity measurements also require stable sample temperature. The Thermocap precision bath provides controlled temperature conditions for glass capillary viscometers, improving repeatability and measurement reliability.
Other capillary viscometer solutions
Besides the BS/U-Tube range for transparent liquids, Fungilab also offers BS/U-Tube viscometers for opaque liquids, together with Cannon-Fenske viscometers and Ubbelohde viscometers for different viscosity measurement requirements.
Typical applications
BS/U-Tube viscometers are widely used for testing petroleum products, lubricants, chemicals and other transparent Newtonian liquids where accurate and repeatable kinematic viscosity measurements are required.
Fungilab can help determine the most appropriate capillary constant and viscometer size according to the expected viscosity range, operating temperature and applicable testing standard.
Frequently asked questions about BS/U-Tube viscometers for transparent liquids
What is a BS/U-Tube viscometer for transparent liquids?
It is a precision borosilicate glass capillary viscometer designed for accurate kinematic viscosity measurements of transparent Newtonian liquids.
Which standards do BS/U-Tube viscometers comply with?
Fungilab BS/U-Tube viscometers are manufactured according to ASTM D445, ASTM D446, ISO 3104, ISO 3105 and UNE 400313.
What measurement precision do BS/U-Tube viscometers provide?
The models designed for transparent liquids provide a measurement precision of approximately ±0.2%.
Does every viscometer include a calibration certificate?
Yes. Each instrument is supplied with an individual calibration certificate including constant values at 40°C and 100°C, providing traceability to recognised international standards.
Which samples can be measured with a BS/U-Tube viscometer?
They are intended for transparent Newtonian liquids such as petroleum products, lubricants, oils and chemical products requiring accurate kinematic viscosity measurements.
Why is temperature control important during viscosity testing?
Kinematic viscosity varies significantly with temperature, so measurements should always be performed under stable thermal conditions using a suitable precision bath.
Can BS/U-Tube viscometers measure opaque liquids?
No. Standard BS/U-Tube models are designed for transparent liquids. For opaque samples, Fungilab offers dedicated BS/IP/RF reverse-flow viscometers specifically developed for opaque Newtonian liquids.
Which other capillary viscometers are available from Fungilab?
Fungilab also manufactures Cannon-Fenske and Ubbelohde capillary viscometers, allowing laboratories to select the most appropriate solution according to the testing method and application.
