Thomas XXX80B1539 Borosilicate Glass Ostwald Oil Viscometer, 5mL Minimum Sample

The Thomas XXX80B1539 Oswald viscometer has a 60 to 100 second test-time range at room temperature and is suitable for the measurement of dynamic viscosity of a transparent Newtonian fluid such as oil. It is made of borosilicate glass for clarity and uses a minimum sample size of 5mL. A vacuum (not included) is used to draw a sample up for timed testing between two sets of printed marks.

A viscometer, also called a viscosimeter, is an instrument used to measure the friction caused by the relative motion of a Newtonian fluid and a known surface, and is usually expressed in units of poise (P), centipoise (cP), pascal seconds (Pa s), and millipascal seconds (mPa s). Viscometers have several forms, including but not limited to falling ball, rotational, vibrating, capillary, funnel, and bubble. A falling ball viscometer measures the time it takes for a ball of known diameter and density to fall through fluid in a cylinder of known diameter. A rotational viscometer measures the force required to stir a fluid. A vibrating viscometer measures the power input necessary to keep the oscillator vibrating at constant amplitude while immersed in a fluid. A capillary viscometer has a narrow-bore vertical section with two printed marks that measure time required for a known volume of fluid to fall a known distance. A funnel viscometer, such as a Ford, Zahn, or Shell cup, measures the time it takes a known volume of fluid to flow from the base of a cone through a short tube. A bubble viscometer measures the time required for an air bubble to rise through a fluid. Viscosity measurements are used in laboratories, research and development, process control, and plant quality control applications. Some viscometers are manufactured to meet industry or governmental standards, including Ingress Protection (IP), National Institute of Standards and Technology (NIST), International Standards Organization (ISO), and ASTM International (formerly American Society for Testing and Materials)

Thomas Scientific manufactures instruments, equipment, supplies, and chemicals for laboratory and scientific applications. The company, founded in 1900, is headquartered in Swedesboro, NJ.