Tensiometers

Photo of DU-NOUY Method Interfacial Tensiometer
Interfacial, DU-NOUY, ring method, ASTM approved. Tensiometer gives precise readings of both surface and interfacial tensions by the ring method to values reproducible to within 0.05 dyne/cm. This instrument is specified for determining interfacial tension of oil against water by the ring method in ASTM Method D-971 and solutions of surface-active agents in ASTM Method D-1331.
Photo of DU-NOUY Method Precision Tensiometer
Precision DuNouy Tensiometer, ring method, ASTM. Tensiometer gives precise readings of upward interfacial and surface tensions by the ring method to values reproducible within 0.05 dyne/cm. This instrument is specified for determining interfacial tension of oil against water by the ring method of ASTM Method D971 and solutions of surface-active agents in ASTM Method D1331. It is also specified for determining the surface tension of industrial water and industrial waste water in ASTM Method D1590. The ring and support stirrup are made of platinum-iridium wire with welded joints.