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With a force capacity of 250N, Instron’s pneumatically operated grips type 2712-019 are particularly suited for tensile testing of soft biological tissues.

This has been demonstrated by an internal study conducted by Instron to determine the gripping method best suited to these applications.

To prevent slipping and premature specimen failure, the grips should have serrated jaw faces.

Optionally, smooth faces can be used.

In addition – and particularly, if smooth faces are chosen – the use of low-grit sandpaper is advisable for gripping the specimens in order to ensure reliable and repeatable test results.

The adjustable gripping pressure of the Series 2712 pneumatic grips makes them eminently suitable for testing of tissue samples and other delicate specimens such as thin sheets, metal or plastic films, fibres, tapes, fine wires and soft materials.

They allow the gripping force to be reduced to prevent jaw breaks, or inversely, increased, if the specimen slips continually or to accommodate varying specimen widths.

The additional use of sandpaper between the clamping jaws and the specimen ensures higher surface friction and simplifies specimen installation, while also preventing the tissue from sticking to the grips.

Generally speaking, Series 2712 pneumatic grips are equally suited to clamping round and flat specimens.

The surfaces of the clamping jaws automatically adapt themselves to the specimen thickness up to a maximum of 6mm, ensuring that the force flow through the specimen is always in line with the central axis of the gripping device.

Depending on the testing problem on hand, a variety of jaw faces with various surfaces, such as smoothground, rubber coated or serrated, are available, along with special models.

Instron pneumatic grips can optionally be operated by means of a footswitch.

Alternatively, opening and closing can be controlled by the test machine so as to automatically apply a preload or release the specimen fragments following failure.

Instron Series 2712 pneumatic grips are rated for nominal forces ranging from 5N to 10kN, making them suitable for use with the versatile tensile test machine from the new Instron 5900 Series.

Depending on the model, the single- or dual-column table-top machines and the dual-column floor-standing models provide maximum test forces ranging from 2 up to 600kN.

Specifically, the dual-column table-top model Instron 5965, which offers a nominal force capacity of 5kN test rates ranging from 0.001 to 3,000mm/min and a test space height of 1,756mm maximum, is suited to a variety of applications in the testing of biomaterials.


Instron is a leading provider of test equipment for the material and structural testing markets. A global company providing single-source convenience, Instron manufactures and services products used to test the mechanical properties and performances of various materials, components and structures in a wide array of environments.

Instron systems evaluate materials ranging from the most fragile filament to advanced high-strength alloys, providing customers with comprehensive solutions for all their research, quality and service-life testing requirements. Additionally, Instron offers a broad range of service capabilities, including assistance with laboratory management, calibration expertise and customer training.

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