Low temperature brittleness tester (semiconductor)

1、 Purpose:

The single sample rubber low-temperature brittleness tester is used to measure the highest temperature at which the vulcanized rubber sample fails due to impact under specified conditions, which is the brittleness temperature. Comparative evaluation can be conducted on the performance of non rigid plastics and other elastic materials under low temperature conditions. It can determine the brittleness temperature and low-temperature performance of vulcanized rubber with different rubber materials or formulations. Therefore, regardless of the quality inspection of scientific research materials and their products. The control of the production process and other aspects are indispensable. This instrument is based onGB/T1682-94Designed according to national standards, all technical indicators meet the requirements of national standards.

IItechnical parameter

2.1Test temperature:-60℃—0℃ (normal)1Half an hour) requires continuous circulation of water to cool down

2.2Impact speed:2m/s±0.2m/s

2.3After constant temperature, conduct the experiment3minTemperature fluctuation within time:< ±1℃

2.4Distance from the center of the impactor to the lower end of the gripper:11±0.5mm

2.5External dimensions:720×700×1300mm

2.6Power:1100w

2.7Cold well volume:700ml

2.8Power Supply:220V

IIIStructural principle

3.1Lift gripper

The lifting gripper consists of a cylinder with a gripper and a cylinder seat

The distance from the impact site of the specimen to the lower end of the gripper is11.0±0.5mm

3.2Impact device

The impact device consists of an impactor and an impact cylinder

3.3Impactor

The shape and size of the impactor head conform toGB1682Standard regulations. The weight of the impactor is200±20gTheir work schedule is40±1mmIn the reset state of the impact cylinder, the distance from the end of the impactor to the specimen is25±1mm.

3.4Freezing medium

Usually industrial ethanol is used

3.5This measuring instrument uses semiconductor refrigeration.

4、 Usage method

4.1Connect the power, and the temperature controller and timer display lights will turn on.

4.2Inject freezing medium (usually industrial ethanol) into the cold well, and the injection amount should ensure that the distance from the lower end of the clamp to the liquid level is75±10mm.

4.3Clamp the sample vertically onto the gripper. The clamp should not be too tight or too loose to prevent deformation or detachment of the sample.

4.4After reaching the test temperature, press the start button, and the testing machine will automatically start working (press the gripper to start freezing the sample, and at the same time, start the timing control switch or press the stopwatch to time. The sample freezing time is specified as3.0±0.5minDuring the freezing period of the sample, the temperature fluctuation of the freezing medium shall not exceed ±1℃）

4.5Remove the sample and bend it in the direction of impact180Carefully observe for any damage.

4.6After the sample is impacted (each sample is only allowed to be impacted once), if damage occurs, the temperature of the freezing medium should be increased. Otherwise, the temperature should be lowered and the test should continue.

4.7Temperature regulation method:a, PresssetKey, the temperature controller enters the setting state

bPress the "<" key to move to the desired position

cPress the "∧" key to adjust the temperature

d, Press“set”Key OK

Through repeated experiments, determine the minimum temperature at which at least two samples remain intact and the maximum temperature at which at least one sample fails, such that the difference between these two results is not greater than1At ℃, the experiment ends.

4Test standards

5.1Specifications

The length of the sample is25.0±0.5mmThe width is6.0±0.5mm, thick as2.0±0.3mm.5.2requirement

The surface of the sample should be smooth, free of foreign impurities and damage. The finished product should be polished and cut to the corresponding size.

VImatters needing attention

6.1During the experiment, the cooling cycle cannot be cut off, otherwise there will be a phenomenon of no cooling.

6.2The cylinder pressure has been adjusted before leaving the factory and cannot be changed arbitrarily.