Project Description

DeMattia Flex Tester

AT-R7016 Demattia flex-cracking Tester China Manufacturer

Demattia Flex Tester is used to determine the cracking resistance and crack growth of vulcanized or thermoplastic rubbers when subjected to repeated flexing.

For measuring the growth of the crack, a cut pierced in the test sample is required before initiating the test.

In addition to being used for rubber testing, It is also applicable to coated leathers, sole and coated fabrics.

Test Principle

A pair of opposing grips is separated to the maximum distance. One end of the test piece is mounted in the upper stationary clamp, and the other end of the test piece is secured in the lower movable clamp, ensuring that the groove on the outside of the test piece sits in the middle of two clamps. The specimen is placed at 90° to the clamps. Visual examinations at frequent intervals are needed after machine actuation until the first small sign of cracking is detected on the specimen. Measurements of the length of cut on the test piece before and during the test are necessary for the determination of crack growth.

The DeMattia flex machine features static clamps for fixing one end of each of the specimens in a fixed position, and the similar but moving clamps for holding the other end of each of the specimens. The stroke of each of movable clampss is 57 ± 0.5 mm. The maximum distance between each set of opposing grips is 75 ± 1 mm. The planes of the gripping surfaces of each opposing pair of grips remain parallel during the motion. The eccentric which actuates the  to-and-fro movement is driven by a constant-speed motor to give as high as 5 Hz, to flex 6 test pieces at one determination.

Test Standards

ASTM-D813 ASTM-D430, BS-903, ISO-132, GB/T13934, GB/T13935, JIS-K6301 etc.

Core Technical Parameters

Model AT-R7016
Test Station 6, 12 or specified
Specimen (L x W x D) (140 ~ 155) x (20~25) x 6.3mm
Grip Space 19 ~ 75 mm, 57 ~ 75 mm Optional and adjustable
Reciprocating Motion Travel 57 mm
Test Speed (300 ± 10) CPM
Counter 0 ~ 999,999
Dimension 55 × 44 × 69 cm
Weight 78 kg
Power 1 phase, AC 220 V ± 10%, 3 A or specified

DeMattia Flex Tester Features

  • Capable of conducting cracking resistance test and crack growth test.
  • As many as 12 test pieces can be clamped into one machine and tested at the same time.
  • Powered by an excellent motor with constant velocity to drive the flexing run.
  • The flexing cycles can be counted automatically and presented via a digital screen.
  • It has easy accessibility with simple buttons and operations.
  • Complies with different international and domestic test standards.

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