Calibrated U-Tube Reverse Flow Viscometer Tube is a precision glass instrument designed for accurate determination of kinematic viscosity of lubricating oils and petroleum products at standard temperatures of 40°C and 100°C. Commonly used in lubricant laboratories, blending plants, and quality control facilities, this viscometer is manufactured from high-grade borosilicate glass and pre-calibrated to ensure reliable and repeatable results.
 
Key Features:
U-Tube Reverse Flow Design – Enables gravity-driven reverse flow for stable and repeatable viscosity readings
Calibrated for 40°C & 100°C – Conforms to standard test conditions for engine and industrial oils
High-Precision Timing Marks – Ensures accurate measurement of flow time
Made from Borosilicate Glass – Chemically inert and thermally stable up to 200°C
Individually Calibrated – Supplied with certificate of calibration traceable to standard reference oils
 
Technical Specifications:
Parameter
Description
Design
U-Tube Reverse Flow
Calibration Temperatures
40°C & 100°C
Material
Borosilicate Glass
Accuracy
±0.5% of measured value
Viscosity Range
As per selected tube constant (e.g., 0.01 to 0.1 mm²/s²)
Tube Constant
Marked on each viscometer (customizable)
Compliance
ASTM D445 / ISO 3104 compatible
 
 
Applications:
Determination of kinematic viscosity of base oils, finished lubricants, hydraulic fluids, and recycled oils
Essential for lubricant blending plants, QA/QC labs, engine oil formulation, and academic research
 
Packaging:
Supplied in shockproof case with calibration certificate and usage instructions
Optional: Thermometer and holder assembly available