Rubber Rebound & Resilience Testing Equipment

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Rubber Rebound & Resilience Testing Equipment
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Rebound resilience shows how much of an impact a compound gives back and how much it absorbs, which matters in compounds developed for shock and vibration. It is also a sensitive way to follow aging and fatigue in an elastomer. NextGen supplies rebound testers for rubber and elastomers, working to ASTM D1054, ISO 4662 and DIN 53512.

The range covers a pendulum tester in manual and fully automatic versions, with optional specimen heating, and a vertical tester that drops a free-falling hammer and records how high it rebounds over repeated impacts. Instruments are installed and calibrated on site, your team is trained on conditioning and reading results, and support continues for the life of the instrument.

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What Rebound Resilience Measures

Rebound resilience is the share of impact energy that a rubber returns after a strike. A very elastic material stores the energy of an impact and releases it, while a plastic one absorbs it. Higher resilience means more energy return, or bounce, and lower resilience means more energy loss, or damping. That makes the test useful for compounds meant for vibration and shock, and for following how a compound changes after aging or fatigue. In production it supports quality assurance on the process and on the finished product.

Standards for Rebound Resilience

ISO 4662 specifies two methods for vulcanized and thermoplastic rubber, a pendulum method and a tripsometer method, within a hardness range that ISO reports as 30 to 85 IRHD. ASTM D1054 uses a Goodyear-Healey rebound pendulum and also addresses penetration. ASTM D2632 measures the impact resilience of solid rubber by the vertical rebound of a dropped mass and is not intended for cellular rubber or coated fabrics. DIN 53512 describes a Schob pendulum method and is marked withdrawn in the DIN catalog, so older specifications that cite it may need to be mapped to a current document.

What Affects Rebound Results

Rebound is a dynamic impact measurement, so specimen thickness and condition, conditioning, the condition of the instrument and the temperature all matter. ASTM D2632 notes sensitivity to temperature and to the design of the rebound instrument, so values are comparable within a controlled setup and not automatically between instrument types. Heating the specimen during the test shows how elasticity changes with temperature. Specimens are small flat pieces, and the pendulum tester takes diameters of 29 to 53 mm at a thickness of 12 mm.

Rebound Testing Equipment from NextGen

The pendulum rebound resilience tester comes in manual and fully automatic versions with a geared motor, a frictionless encoder, a resolution of 0.1 % and optional specimen heating up to 100 °C. Its pendulum is 200 mm long, falls through 90° and strikes at 2 m/s. Results go to a PC over an RS232 interface for processing in HardTest software, and a DAkkS calibration certificate is available from the manufacturer. The vertical GenRebound releases a plunger onto the specimen for a set number of impacts and averages the fourth to sixth.

For Laboratories

One partner to equip your complete rubber laboratory

Resilience testing is one station of an elastomer laboratory. NextGen equips the rest of it too, from tensile frames to cure testing, hardness, abrasion and specimen preparation, and stays responsible for it after delivery.

  • Equipment, fixtures and software
  • Installation, training, calibration
  • Lifetime technical support

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FAQs

Follow the one your specification names. The pendulum tester is listed under DIN 53512, ASTM D1054 and ISO 4662, and the vertical GenRebound product summary cites ASTM D2632. Values from different instrument types are not automatically interchangeable, so keep comparisons within one method. Because DIN 53512 is marked withdrawn, contact our team if a legacy callout needs mapping.

The machine is leveled, the plunger is raised to a set height and released onto the specimen for a given number of impacts. The first three are discarded, and the average of the fourth, fifth and sixth is the result. Test films sit 14 mm from the edge of the specimen. The analog GenRebound drops a 28 g hammer from 40 cm and suits compounds made to absorb shock or vibration.

Specimens are 29 to 53 mm (1.14 to 2.09 in) in diameter and 12 mm (0.47 in) thick, and the instrument adjusts for specimen thickness from 0 to 60 mm. A 200 N clamping device holds the specimen against the anvil. Results leave the independent electronic unit through an RS232 interface, and HardTest software collects and processes them.

An optional heating module brings the contact surface of the specimen to a selectable temperature from 10 °C to a maximum of 100 °C, and a second specimen can be preconditioned at the same time. The pendulum tester can therefore simulate the effect of heat on the elasticity of samples with different formulations.

Foam and cellular rubber are better served by a ball rebound method. ASTM D2632 states it is not intended for cellular rubber, and ISO 4662 notes that foams may need a different method. The digital ball rebound tester on the GenRebound page drops a 16 mm magnetic ball from 500 mm onto the specimen, and ball rebound testers are also listed in the Plastic and Foam Rebound category.