LORD TECHNICAL DATA

MRF-140CG Magneto-Rheological Fluid
Description

Features and Benefits

LORD MRF-140CG fluid is a hydrocarbon-basedmagneto-rheological (MR) fluid formulated for generaluse in controllable, energy-dissipating applications suchas shocks, dampers and brakes.

Fast Response Time – responds instantly and reversibly
to changes in a magnetic field.

MRF-140CG fluid is a suspension of micron-sized,
magnetizable particles in a carrier fluid. When exposed
to a magnetic field, the rheology of MRF-140CG fluid
reversibly and instantaneously changes from a freeflowing liquid to a semi-solid with controllable yieldstrength. Altering the strength of the applied magnetic
field precisely and proportionally controls the consistency
or yield strength of the fluid.
MRF-140CG fluid can be used in valve mode (fluid
flowing through an orifice) or in shear mode (fluid
shearing between two surfaces). In the absence of amagnetic field, MRF-140CG fluid flows freely or allows
free movement. Upon application of a magnetic field,
the fluid’s particles align with the direction of the field in
chain-like fashion, thereby restricting the fluid’s movement within the gap in proportion to the strength of themagnetic field.

Dynamic Yield Strength – provides high yield strength
in the presence of a magnetic field and very low yieldstrength in the absence of a magnetic field; allows for awide range of controllability.
Temperature Resistant – performs consistently
throughout a broad temperature range, meeting therequirements of demanding applications such as automotive shock absorbers.
Hard Settling Resistant – provides high resistance tohard settling; easily redispersed.
Non-Abrasive – formulated to not abrade the devices inwhich the MR fluid is used.

Application
Mixing – Under common flow conditions, no separation
is observed between particles and the carrier fluid.
However, a degree of separation may eventually occur
under static conditions. If needed, use a paint shaker toredisperse the particles into a homogeneous state prior
to use.

Storage
Keep container tightly closed when not in use.

Typical Properties*
Appearance
Viscosity, Pa-s @ 40°C (104°F)

Dark Gray Liquid0.280 ± 0.070

Calculated as slope 800-1200 sec-1

Densityg/cm3(lb/gal)
Solids Content by Weight, %Flash Point, °C (°F)
Operating Temperature, °C (°F)

3.54-3.74(29.5-31.2)
85.44>150 (>302)-40 to +130 (-40 to +266)*Data is typical and not to be used for specification purposes.

LORD TECHNICAL DATA
Cautionary Information

Yield Stress vs. Magnetic Field Strength70

Before using this or any LORD product, refer to the Safety
Data Sheet (SDS) and label for safe use and handling
instructions.

60

YieldStressStress(kPa)(kPa)
Yield50

For industrial/commercial use only. Not to be used inhousehold applications. Not for consumer use.

403020

Shear Stress as a function of Shear Rate withno Magnetic Field applied at 40°C (104°F)

10400.00050100200250

Typical Magnetic Properties

300.0

2250.01.5

1200.00.5

B(Tesla)B (Tesia)StressShear Shear
Stress(Pa)(Pa)150

HH(kAmp/m)(kAmp/m)

350.0

150.0

100.00-800-600-400-2000200

400

600

800-0.5-150.00
-1.5

00

200.0

400.0

600.0

800.0

Shear Rate
Rate (1/sec)
Shear(1/sec)

1000

1200-2H (kAmp/m)

H (kAmp/m)

Tesla

Values stated in this technical data sheet represent typical values as not all tests are run on each lot of material produced. For formalized productspecifications for specific product end uses, contact the Customer Support Center.
Information provided herein is based upon tests believed to be reliable. In as much as LORD Corporation has no control over the manner in which
others may use this information, it does not guarantee the results to be obtained. In addition, LORD Corporation does not guarantee the performance of the product or the results obtained from the use of the product or this information where the product has been repackaged by any thirdparty, including but not limited to any product end-user. Nor does the company make any express or implied warranty of merchantability or fitness
for a particular purpose concerning the effects or results of such use.
LORD provides valuable expertise in adhesives and coatings, vibration and motion control, and magnetically responsive technologies. Our
people work in collaboration with our customers to help them increase the value of their products. Innovative and responsive in an ever-changing
marketplace, we are focused on providing solutions for our customers worldwide.
LORD Corporation
World Headquarters
111 Lord DriveCary, NC 27511-7923
USACustomer Support Center (in United States & Canada)+1 877 ASK LORD (275 5673)
www.lord.com
For a listing of our worldwide locations, visit LORD.com.
©2019 LORD Corporation OD DS7012 (Rev.2 6/19)