Equipment summary

The rubber low-temperature brittleness tester is the highest temperature when the sample is damaged by impact under the specified conditions, that is, the brittleness temperature, which can be used to compare the performance of plastics and other elastic materials under low temperature conditions. It can measure the brittleness temperature and low temperature performance of vulcanized rubber of different rubber materials or different formulations. Therefore, it is indispensable in the quality inspection of scientific research materials and their products, and the control of production processes. The instrument is designed according to GB1682 national standard. The technical indicators meet the requirements of HG 2-162-1965 plastic low temperature impact compression test method and GB5470-2008 plastic impact embrittlement temperature test method.

Comply standard:

ISO 812

ISO 974

GB/T 15256

GB/T 5470-2008

GB/T 1682

HG2-165-65

ASTM D746

Technical parameters

1. Test temperature and time: -70 degrees (normally more than 1 hour)
2. Impact speed: 2m/s±0.2m/s
3. After the constant temperature, the temperature fluctuation during the test within 3 minutes: <±0.5°C fluctuation is small, and the temperature control is more accurate.
4. Distance from the center of the impactor to the lower end of the holder: 11±0.5mm

5, size: 910×510×860 studio size: 240×170×150 (length × width × height)

6, power: 800W

The method of use

3.1 Turn on the power, and the temperature controller and timer display lights.

3.2 Inject cold medium (usually industrial ethanol) into the cold well, and the injection amount should ensure that the distance from the lower end of the holder to the liquid surface is 75±10mm.

3.3 Hold the specimen vertically on the holder. The clip should not be too tight or too loose to prevent the sample from deforming or falling off.

3.4 After the test temperature is reached, press the start button, the test machine will work automatically (press the gripper, start freezing the sample, start the timing control switch or press the stopwatch. The sample freezing time is specified as 3.0±0.5min. During the freezing period, the temperature of the freezing medium should not exceed ±1 °C)

3.5 Remove the sample and bend the sample to 180° in the direction of impact. Observe the damage carefully.

3.6 After the sample is impacted (only one impact per sample), if there is damage, the temperature of the freezing medium should be increased, otherwise the temperature will be lowered and the test will continue.

3.7 Temperature adjustment method: a, press the set button, the temperature controller enters the setting state

1. Press the “<” button to move to the position you want to set.
2. Press the “∧” button to adjust the temperature.

d, press the “set” button to confirm

Through trial and error, the lowest temperature at which at least two samples are not destroyed and the highest temperature at which at least one sample is destroyed are determined. If the difference between the two results is not more than 1 ° C, the test is finished.