M6500 Spinning Drop Tensiometer


  • Height: 19.5 in.
  • Width: 11.5 in.
  • Depth: 19 in.
  • Weight: 24 lbs.

High-resolution microscope for enhanced accuracy
The M6500 microscope magnifies up to 25x and enables a numerical display resolution of 0.0001 mm, giving the researcher the greatest measurement accuracy of any comparable device

Light-weight and easy to handle
The M6500 weighs only 24 lbs. and includes a level adjustment control and handles on two sides. This allows the user to pick up and manipulate the unit in order to reposition the test droplet quickly and easily.

The Grace Instrument M6500 Spinning Drop Tensiometer was developed for the measurement of interfacial tension, surface tension, absorption rate and extreme low interfacial tension. Excellent temperature control and optimum synchronization of the instrument allow the sample to be observed over a long period of time under constant conditions.

When measuring low interfacial tension, the Grace Instrument M6500 Spinning Drop Tensiometer features enhanced accuracy compared to automatic, software-controlled units thanks to an advanced much-higher-resolution microscope than on competing models.

Dimensions: 19.5" height x 11.5" width x 19" depth
Weight: 24 lbs.
Temperature Range: Ambient (45°F with chiller) to 212 °F
Speed Range: 0 to 11,000 rpm continuous
Surface Tension Measurement 10-6 to 10^2 mN/m
Capillary diameter:
2.0 mm
Microscope magnification: 25x
LCD Numerical Display Resolution: 0.0001 mm
Voltage: 120V or 240 V (with transformer)
Digital Camera Imaging System: (Requires Microsoft Windows XP or later OS for operation)
Live Resolution: 2.0 MP
Optical Format: 1/3"
Focusable Lens: 16 mm
  • Measurement of extremely low interfacial surface tension
  • Accurate RTD temperature readout
  • Advanced PID temperature controller
  • Accurate speed controller ensures high image synchronization
  • High accuracy of reading with stroboscope illumination
  • LCD numerical display for integrated microscope
  • Light weight
  • Adjustable leveling
  • Optional chiller sleeve for low temperature applications
  • Optional digital camera imaging system (includes third-party PC software for data measurement and image processing)
Downloads for the M6500 Spinning Drop Tensiometer:

Read more about our instrument's technical applications within these scientific and academic publications:

  1. Optimal Salinity Study to Support Surfactant Imbibition into the Bakken Shale
    Study of dilute surfactant formulations and optimal salinities of Bakken formation waters and oils, in order to examine the potential to imbibe into and displace oil from the formation. IFT measurements between oil and surfactant were conducted at temperatures of 30, 60, 90 °C by means of a M6500 Spinning drop tensiometer.
    http://dx.doi.org/10.2118/167142-MS
    SPE 167142
  2. Impact of Surfactants for Wettability Alteration in Stimulation Fluids and the Potential for Surfactant EOR in Unconventional Liquid Reservoirs
    Evaluation and comparison of anionic and nonionic surfactants effect on wettability and interfacial tension alteration in carbonate and siliceous preserved side-wall shale cores. M6500 was used to measure low IFT values (less than 2mN/m) between oil drop and frac fluid.
    http://dx.doi.org/10.2118/169001-MS
    SPE 169001
  3. Interfacial Rheology of Heavy Oil-Aqueous Systems at Elevated Temperatures and Pressures: Effect of Diluents
    The effect of diluents on interfacial rheology of a heavy oil and synthetic brine when subjected to high pressure high temperature as well as room temperature and atmospheric pressure conditions. M6500 was used to measure IFT values between diluted oil and synthetic brine.
    http://dx.doi.org/10.2118/170128-MS
    SPE 170128
  4. Effect of Surfactant Polymer Interaction on the Interfacial Properties for Chemical EOR
    Investigation of surfactant polymer systems and the interfacial tensions occurring between the various formulations and a Saudi Arabian crude oil at temperatures between 30° and 90° C by a means of M6500 spinning drop tensiometer.
    http://dx.doi.org/10.2118/172706-MS
    SPE 172706
  5. Optimizing Water Chemistry to Improve Oil Recovery from the Middle Bakken Formation
    Investigation of interfacial tension reduction between Bakken oil and different surfactant formulations at 90°C. Each individual measurement was run for 2-4 hours before reading after the oil drop was stable in the tensiometer.
    http://dx.doi.org/10.2118/179541-MS
    SPE-179541-MS
  6. Scaling Laboratory-Data Surfactant-Imbibition Rates to the Field in Fractured-Shale Formations
    Interfacial tension between oil and aqueous liquid was measured. The interfacial tension measurements were conducted at 115 °C for four different types of surfactant formulations, and brine water alone at 4% TDS.
    http://dx.doi.org/10.2118/178489-MS
    SPE-178489-PA
  7. Experimental Investigation of Crude Oil Emulsion Physicochemical Properties and Demulsifier Dosage Prediction
    Crude oil emulsions are formed naturally in oil wells with the presence of natural surfactants that form a rigid interfacial film with high interfacial tension. The effect of four demulsifiers was investigated by measuring the interfacial tension of emulsified water with crude oil at 50 °C.
    http://dx.doi.org/10.2118/176465-MS
    SPE-176465-MS