Low temperature brittleness tester

ZY-1006OakPlasticLow temperature brittleness testing machine(Compressor refrigeration)

1Characteristics and Applications:

ZY-1006OakPlasticLow temperature brittleness testing machineIt's measuring materialsThe highest temperature at which the specimen fails under specified conditions due to impact is the brittle temperature, which can be used for comparative identification of the performance of 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, quality inspection of scientific research materials and their products, control of production processes, and other aspects are indispensable. This instrument is based onGB/T1682-2014Designed according to national standards, all technical indicators comply withGB/T5470-2008Requirements of national standards such as plastic impact brittleness temperature test method.
II technical parameter

1、Test temperature and time:-75Degree (normal)1More than an hour)Short cooling time, no need for water cooling, more environmentally friendly.

2、Cooling rate:

0℃~ -30℃1.2℃/min

-30℃~ -40℃1℃/min

-40℃~ -75℃0.7℃/min

3Impact speed:2m/s±0.2m/s
4. After constant temperature,Temperature fluctuation<±0.5The fluctuation of ℃ is small, and the temperature control is more accurate.
5. Distance from the center of the impactor to the lower end of the gripper: 11 ±0.5mm
6Maximum external dimensions:900×505×950mm(Length x Height x Width)

7Effective studio space:160×140×100mm(Length x Height x Width)
8Power:800W The power is smaller, and the compressor will automatically shut down after reaching the temperature, which is more environmentally friendly and energy-saving.

IIIStructural principle

1. Lifting gripper

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

The distance from the impacted part of the specimen to the lower end of the gripper is 11.0 ± 0.5mm.

2 Impact devices

The impact device consists of an impactor and an impact cylinder.

3 impactors

The weight of the impactor is200 ± 20g, with a working stroke of 40 ± 1mm. In the reset state of the impact cylinder, the distance from the end of the impactor to the specimen is 25 ± 1mm.

4 Freezing media: Industrial ethanol 5 measuring instrumentsUsing a compressor for direct coolingNo need for cooling circulating water.

4 usage method

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

Inject freezing medium (usually industrial ethanol) into the cold well in two directions, and the injection amount should ensure that the distance from the lower end of the clamp to the liquid level is 75 ± 10mm.

3. Vertically clamp the sample onto the gripper. The clamp should not be too tight or too loose to prevent deformation or detachment of the sample.

Press the gripper to start freezing the sample, and at the same time, activate the timing control switch (or press the stopwatch) to start timing. The freezing time for the sample is specified as 3.0 ± 0.5min. During the freezing period of the sample, the temperature fluctuation of the freezing medium shall not exceed ± 1 ℃.

Lift the lifting gripper and allow the impactor to impact the specimen within half a second.

Remove the sample and bend it 180 ° in the direction of impact, carefully observing for any damage.

After the impact of 7 samples (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.

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 thanAt 1 ℃, the experiment ends.

5、 Test standards

1 Specification:The length of the sample is25.0 ± 0.5mm, width 6.0 ± 0.5mm, thickness 2.0 ± 0.3mm.

Requirement 2: 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.

6、 Precautions

The pressure of cylinder 1 has been adjusted before leaving the factory and cannot be changed arbitrarily.