Summary: Information on testing machines and equipment for performing 4 point bend tests on plastics, according to the practices of ASTM D6272. Flexural Bend Standard Test Methods ASTM D6272 covers the practices for bend testing plastics with a four point bend tests. A rectangular cross section bar rests on twp supports and is loaded at two points. The test specimen is and loading members are symmetrically placed relative to the central axis. The load in increased until failure or rupture occurs at the outside edge of the plastic test specimen. The maximum strain of plastic test specimen that can be achieved with the scope of ASTM D6272 is 5%. Bend testing plastic through the practices of ASTM D6272 should be done to ensure repeatable testing results. Repeatable testing ensures that measurements are not influenced by factors that were not considered. For bend testing plastics this might include loading rate, or specimen thickness.
Applicable Testing Standards
- ISO 178 3 Point Bend of Plastics | Flexural Test Machines & Equipment
- ASTM D790 Testing for Flexural Properties of Plastics and Insulating Materials
- ASTM D6272 Four Point Flexural Bend Test Machine for Plastics and Insulating Materials
Recommended Test Machine
Forces up to 10 kN (2,250 lbf)
Low force tabletop systems
Modular series of five frame options with adjustable test space
Affordable testing option for tension, compression, bend, peel and much more
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 up to 250 kN (56,250 lbf)
Base lengths up to 1200 mm (48 in)
Various roller sizes available
Available in 3-point and 4-point configurations
Load ratings up to 10 kN (2,250 lbf)
Interchangeable roller diameters from 1 mm to 12.7 mm (0.04 in to 0.5 in)
Easily adjustable span
Base lengths of 150 mm (6 in) and 300 mm (12 in)
Available from a 1 mm (0.04 in) measurement range to a 25 mm (1.0 in) measurement range
May be used in a wide variety of tests
Includes a magnetic and adjustable mounting base
Standard units meet Class B-1 of ASTM E83, Class 0,5 of ISO 9513
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
