79-25 Bending Resistance Tester
  • TMI Bending Resistance Tester & Optional GraphMaster™ Software


    Model 79-25 is a user-friendly microprocessor controlled instrument to determine the bending resistance of paper, paperboard, plastic film, medical tubing, and wire. Bending stiffness is a characteristic associated with the rigidity of a material. This property is related to the modulus of elasticity of the material's stiffness. Our Bending Tester was originally developed to produce a more concise, consistent measurement for the paper industry. This property is now used in a variety of industries including personal products, paper, flexible films, packaging and non-wovens.

    Our two-point method secures the specimen into a pneumatic clamp and bends the sample up to 90° against a force transducer.

    What makes our Bending Resistance instrument so unique is its versatility and accuracy. Bending forces are measured at selectable bending angles from 5.0 to 90°. The instrument is available with a 100 or 1000 gram precision load cell. The advanced data acquisition system senses forces down to 0.5g. Materials can range from 5 to 50mm in length, up to 2.5mm thick.

    • Very flexible for performing different types of tests and for different standards.
    • Pre-certified weights and sample cutter options
    • Ability to add special formulas to meet unique bending stiffness requirements
    • Competitive advantages for accuracy and usability
    • Motorized testing and pneumatic clamping eliminates operator influence

    • Choice of 10N or 1000mN load cell
    • Min. force sensitivity: 0.5mN with 1000mN load cell
    • Selectable bending angle 5.0-90° and test length 5-50mm
    • Meets ISO 2493, AS/NZ 1301-4535, BS 3748, DIN 53121, SCAN P29, TAPPI T556
    • RS232 serial data output, printer output and analog signal output
    • Can be directly calibrated to traceable National standards

    • Direct sample to load cell contact for accurate measurement
    • Easy selection of test parameters from a comprehensive range through a setup menu
    • Motorized test length setting
    • Pneumatic clamps with fast release provide consistent clamping pressures for fast, repeatable results
    • Large, clear display showing peak value and angle
    • Load cells are fitted with overload protection
    • Direct data output via RS-232 to printer or optional GraphMasterTM analysis software
    • Calculates Taber Stiffness, Youngs Modulus, Gurley Stiffness units.
    • Can be directly calibrated to traceable national standards


    ISO 2493, AS/NZ 1301-4535, BS 3748, DIN 53121, SCAN P29, TAPPI T556
    Can be directly calibrated to traceable national standards

      Depth:   330 mm (13 in.)
      Height:   180 mm (7 in.)
      Width:   330 mm (13 in.)
      Weight   15 kg (33 lb)

      Electrical:   Specify voltage requirements when ordering
      Air:   (instrument quality) 400-600 kPa700 kPa (90 psi) max. supply pressure

    • Clear plastic table for dead weight calibration

    • Certified dead weight set to meet ISO requirements
    • Sample Cutter
    • Printer

      Load cell   Catalog Number
      10 N   79-25
      1,000 mN   79-25 (specify 1,000 mN)

    Download Brochure PDF