ASTM D412 and ISO 37 are good tensile test methods to characterize the general stress-strain characteristics of natural rubber, synthetic rubber, silicone rubber, and TPEs (Thermoplastic Elastomers). Both ASTM D412 and ISO 37 specify the test method details to determine tensile stress-strain properties of molded and die cut rubber and elastomers. Rubber and elastomers both feature high extensibility and so extensometers are typically required to accurately measure elongation or stretch while loading is applied. An application engineer can assist in the selection of the best grip and jaw face for rubber tests. Pneumatic air grips with serrated or rubber coated faces are common. A constant gripping force can prevent specimen slippage when specimens elongate. Self-tightening grips, such as roller grips, are also adequate for rubber tests.
Applicable Testing Standards
Recommended Test Machine
Forces up to 5 kN (1,125 lbf)
Low force tabletop systems
Tests at speeds up to 2,500 mm/min (100 in/min)
Best for high travel or high elongation test requirements
Force range of 5 kN to 600 kN (1,125 lbf to 135,000 lbf)
Adjustable test space
The most popular choice for static tension and compression tests
These dual column testers are available in both tabletop and floor standing models
Recommended Testing Accessories
Load ratings from 1 kN to 10 kN (225 lbf to 2,250 lbf)
Maximum specimen thicknesses of 7 mm or 8 mm (0.28 in. or 0.31 in.)
Works very well with flat, thin specimens
Eccentric design increases gripping force with tension
Rated to 500 N (112 lbf)
Maximum specimen thickness of 6 mm (0.23 in)
Pneumatic design allows for quick specimen setup
Consistent clamping force between tests
Designed for applications that deal with very elastic material, such as rubber
No inherent gage length, allowing it to be used for almost any sized specimen
Maximum travel ratings up to 1,100 mm (43 in)
Adjustable clips allow for gripping onto various specimen thicknesses and materials
Standard temperature range of -155°C to 620°C (-247°F to 1150°F)
Accompanied by a broad set of accessories that are capable of withstanding the heat or cold
PID controlled internal temperature
Mounts directly to the test frame
Cuts test specimens from stock material
Available for a wide variety of ISO and ASTM standards
Consistent specimens for consistent results
Manufactured with tool steel to resist damage and wear over time