Fully Automatic DMA

Model : VR-7130

  • Rubber and Plastics
  • Viscoelasticity (DMA)

VR-7130 Automatic DMA was designed to minimize possible causes of measurement errors and variability by adopting the full automatic system and the unique temperature sensor. In combination with THERMO JETTER, it can measure viscoelasticity down to -90°C (-100°C as an option) without using liquid nitrogen.

A high-polymer material is a viscoelastic material, unlike elastic materials such as metals. In the case of elastic body, strain (response) comes up simultaneously to the given force (input). On the contrary, in case of a high polymer material, time lag will occur between input and response. These relations are different by the sample components and also dependent on temperature, velocity and strain. High polymer materials are used for various uses in various fields by using such characteristics.
As these properties are mainly treated as material properties, response to very minute input (force or strain) will be mainly measured. (Strain is measured to force or force to strain.) The VR-7130 has minimized possibility of human errors and realized excellent precision in viscoelasticity measurement of high-polymer materials.

  • Possible to load 100 max. samples automatically

  • Sample chucking, measurement and discharge are automated, thus minimizing human errors.

  • The temperature difference between the sample and the measurement point was solved by using a thermocouple with a rubber coating of the same thickness as the sample and adopting the step temperature control method.

  • In the measurement of viscoelasticity, minute deformations such as several μm to several tens of μm are measured, so the rigidity (deflection) of each component affects the test results. The DMA adopts a piezoelectric load cell to minimize deflection of the load cell itself, realizing more precise load measurement.

  • The compact body minimizes the influence of resonance and realizes accurate measurements within the measurement frequency of 0.1 to 200Hz (except for the character frequency of the sample).

  • Thermo Jetter cooling system enables measurement at low temperature down to -90°C(-100 °C as an option) without using liquid nitrogen

  • Direct calculation of the phase realizes improve measurement accuracy.

  • Master curve is available optionally.

  • Frequency: 0.1 to 200Hz (Variable)

  • Maximum load: 200N (with Load cell ±450N)


 Simulation of product property by test pieces


 Tire: Abrasion/Friction/Rolling Resistance/Evolution of heat etc.
Car: Ride/Vibration-proof performance/noise

Other Vibration control and/or suppression/Sealing ability………


 Molecular structure/degradation level etc.


 Fixed point measurement


 Temperature dispersion


 Frequency Dispersion


 Strain dispersion


 Absolute complex modulus[E✽]


 Storage modulus E’


 Loss Modulus E’’


 Tangent delta tanδ


 Database software

 Management of testing conditions

 Management of testing results

 Management of equipment conditions​​​​​​

 Data backup



 Measurement software

Test Condition Input Screen

 Choice of testing modeFixed point measurement, Temperature dispersion, Frequency dispersion, Strain dispersion etc.

 Setup of testing conditionsTesting temperature, frequency and strain

 Sample conditionsThickness, Breadth​​​​​​



Testing Screen

 Real time indications while testing(Graph and numeric display)

 Present conditions are available by status display. Error handling is easy also

 Reporting output and text conversion(CSV form) after testing are possible



 Master curve software

Viscoelasticity at high-frequency, under impossible conditions for actual testing,  can be estimated by experimental formula

 Low temperature propertyHigh-frequency property

 High temperature propertyLow-frequency property


Name Fully Automatic DMA
Model VR-7130
Sample dimensions Rectangular shape 40(L) x 4(W) x 2(t) mm
Testing method Vertical tensile method
Sample convey system Automatic: 100 samples max. 
Distance between chucks 20mm (Option: 10mm)
Load detection (1)Load detector: Piezoelectric type load cell(Choose rating:±45N or±450N)
(2)Maximum load: 200N(with Lod cell ±450N)
(3)Resolution: 1% F.S.
Displacement detection (1)Displacement sensor: Optical fiber, non-contact type small displacement sensor
(2)Maximum displacement: 1,000μm
(3)Resolution: 0.3μm
Vibrator (1)Vibration system: Electric vibrator (Lower chuck drive)
(2)Vibration waveform: Sinusoidal wave
(3)Vibration frequency: 0.1 to 200Hz continuously variable
(4)Vibration amplitude (strain): ±0.1 to ±2.5% (40 to 1,000μm p-p) continuously variable (±0.2 to ±5% in case of 10-mm chuck distance)
Initial tension (1)Mechanism: Lower side chuck tension by the vibrator
(2)Method: Constant strain method, constant load method (calculated to strain)
(3)Tension: 0μm to 2,000μm
Thermostatic chamber Framework: Opens and closes automatically
Testing temperature range

-90 to 200℃(optionallly down to -100℃ without using liquid nitrogen)

Safety device (1)Emergency stop switch
(2)Overheat limiter
(3)Pneumatic limiter
(4)Ground-fault circuit breaker
Connection for control (1)Main unit control: USB
(2)Temperature control: RS-232C (D-SUB 9pin)

(1)Main unit : Power source AC100V 1-phase 2kVA Dry air 0.4MPa
(2)Thermo Jetter:Power source AC200V 3-phase 4kVA Dry air 0.5MPa Flow rate 250L/min (under atmospheric pressure)

Usage environment (1)Temperature : 5 to 40℃
(2)Humidity : 35 to 80%RH
Dimensions Main unit and the rack: approx. 470 (W) x 470 (D) x 1320 (H) mm
Thermo Jetter (cooling air generator): approx. 510(W)x740(D)x1110(H) mm
Accessories Load calibration tool, tool set and connection cables


 Master curve software


 Temperature/strain dispersion, Temperature/frequency dispersion


 Sample cutting blade, the exchangeable blade type


Inquiries about Fully Automatic DMA

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