Local thermal sensitivity meter (local thermal sensitivity test)

purpose

Local thermal sensitivity is used to test the reaction of samples at different temperatures, such as thermal decomposition, combustion, etc. Through testing, its thermal stability, thermal sensitivity and other properties can be understood, providing a basis for subsequent optimization and improvement. Local thermal sensitivity testing is a method of evaluating the reaction characteristics of energetic materials under local heating conditions. It can be used to characterize the difficulty of combustion or explosion of a sample under the action of a local heat source. The level of local thermal sensitivity directly affects the safety and reliability of energetic materials. If the local thermal sensitivity of energetic materials is too high, it means that they are more prone to combustion or explosion when heated, thereby increasing the safety risk during use.

Sample explosion removal diagram

application

Through local thermal sensitivity testing, the safety risks of energetic materials in different environments can be evaluated, and corresponding safety measures and emergency plans can be formulated. This helps to reduce the likelihood of accidents and ensure the safety of personnel and equipment. The local thermal sensitivity tester can be used as a quality control measure in the production process of energetic materials. Through testing, problems in the production process can be identified in a timely manner, such as unstable raw material quality, improper production processes, etc., and measures can be taken to improve them in a timely manner. In the development process of new energetic materials, local thermal sensitivity testing can provide critical data support. By conducting local thermal sensitivity tests on new materials, their thermal stability, thermal sensitivity, and other properties can be understood, providing a basis for subsequent optimization and improvement. Many countries and regions have established safety standards and regulations regarding energetic materials. Conducting local thermal sensitivity testing helps ensure that energetic materials comply with relevant regulatory requirements, avoiding legal disputes and economic losses caused by non-compliance with standards. (Local thermal sensitivity test, energetic material local thermal sensitivity test, local thermal sensitivity tester, local thermal sensitivity analyzer)

The level of local thermal sensitivity directly affects the safety and reliability of the medication. If the local thermal sensitivity of the medication is too high, it means that it is more prone to combustion or explosion when heated, thereby increasing the safety risk during use. Therefore, in the design, production, and use of pharmaceuticals, strict testing and control of local thermal sensitivity are required to ensure their safety and reliability.

technical parameters

1. Heating furnace: Room temperature -800 ℃.

2. Accuracy: ± 2 ℃.

3. Combustion chamber: The material of the window and ventilation device is stainless steel, with a specification of 600 × 600 × 300mm.

4. Sample pool: Made of stainless steel, the tray is located at the center of the bottom of the combustion chamber.

5. Steel ball: stainless steel, specification 6.0mm, solid.

6. Steel ball distance from the bottom of the sample pool: 420mm.

7. Phototube: Operating voltage is 15V, dark current is less than 30nA.

8. Sensitivity: 0.5uA/uw.

9. Rise time: 50ns, fall time is 50ns.

10. Photocurrent: not less than 50uA.

11. Light sensitive area: 3.0mmx3.0mm.

12. Temperature sensor range: 0~1100 ℃, accuracy better than 1 ℃.

13. The photoelectric cell is located on the vertical centerline of the combustion chamber sidewall, 90mm from the bottom of the combustion chamber, and 300mm horizontally from the center of the tray.

14. Timing unit: accuracy of 1ms.

15. Frequency: 1500Hz.

16. Trigger ports: 2, trigger voltage 24VDC.

17. Trigger delay time: 18ms.

18. Combustion time timer: accuracy better than 1ms, timing length of 60s.

Thermal sensitivity, thermal stability, decomposition temperature, and thermodynamic testing methods:

1. Automatic explosion point tester: The automatic explosion temperature tester is used to test and evaluate the thermal sensitivity of energetic materials. Thermal sensitivity is a key indicator to measure the ease of explosion of energetic materials under external thermal energy, which is crucial for ensuring the safety of energetic materials during storage, transportation, and use.

2. Explosion resistant differential thermal analyzer: The explosive differential thermal analyzer is specifically used to test the thermal stability, stability, and compatibility of energetic materials. The test results can accurately describe the relationship between the physical and chemical properties of the material and temperature changes. The device can test the starting decomposition temperature, peak temperature, ending decomposition temperature, temperature difference up to large temperature, Onset point temperature, as well as the full temperature range curve of the sample during the heating process from room temperature to 550 ℃.

3. Dynamic vacuum stability tester: tests the amount of gas released by energetic materials during heating to evaluate their chemical stability and compatibility. The main applications include: thermal safety testing, storage life assessment, compatibility testing, aging testing, full decomposition temperature and decomposition time testing, small parallel reaction vessels, thermal decomposition process kinetics testing, etc.

4. Large scale critical temperature tester: Under external conditions such as strong electromagnetic radiation or high temperature, solid propellants will absorb electromagnetic energy and be heated. When a certain temperature is reached, a thermal decomposition reaction occurs inside, causing a sharp increase in temperature and potentially leading to combustion or explosion. Therefore, understanding and mastering the critical temperature of solid propellants is very important. In addition, critical temperature testing can provide guidance for the storage and transportation of propellants.

5. Explosive heat tester: can be used to test the explosive heat, explosive volume, and pressure of explosive systems of energetic materials; It can also be used to test the combustion calorific value of various organic or inorganic samples. The experiment can be conducted in different atmospheric environments (air, nitrogen, oxygen, vacuum). The ignition system can resist the impact of detonation waves, high temperature, high pressure, and active oxygen environment. The pressure collection system detects real-time pressure changes inside the explosive container and draws pressure curves.

6. Solid propellant burning rate testing system: used to test important parameters of material combustion process, such as burning rate coefficient, burning rate pressure index, burning rate temperature sensitivity coefficient, etc. These parameters are key indicators for characterizing the combustion performance of propellants. They not only help evaluate the combustion efficiency of propellants, but also provide important theoretical basis for the formulation design and production process of propellants.

7. Automatic lifting acceleration aging tester: Energy containing materials undergo exothermic decomposition during use or storage, and the exothermic reaction rate is proportional to temperature. Under normal conditions, the decomposition rate is very low, and accelerated aging tests can be used to predict the service life of explosives. During the experiment, evaluate changes in sample sensitivity, stability, chemical composition, or mechanical properties.

8. Bergman Kink tester: tests the thermal stability of substances and is used to evaluate the chemical stability of energetic materials. This test is based on measuring the content of gas products released during the thermal decomposition process of the sample. The generation of gas products is evaluated by volumetric analysis of acids in water extracts.

9. Viennese tester: used to test the chemical stability of energetic materials, and can also test the chemical stability of nitrocellulose and its products. Add a quantitative sample to a test tube and heat it under specified conditions to test the heating time required for the litmus paper to turn red or for the sample to release brown smoke, in order to evaluate its chemical stability.

10. Methyl violet tester: Evaluate the thermal stability of energetic materials. This method mainly uses NO2 produced by the decomposition of nitrate esters to evaluate the stability of the tested substance, which is determined by the change in color of the test paper. The testing time starts from the insertion of the sample into the heating module until the color of the test paper changes.

11. Absolute heat calorimeter: It can directly simulate uncontrolled reactions on a factory scale in the laboratory. The use of insulated Dewar vessels can minimize the heat loss between the calorimeter (low phi factor value) and the environment. The Dewar system consists of a double shell 1.1 L stainless steel reaction vessel. The rated pressure at room temperature is 35 bar, and a mechanical stirring device is provided.

12. Local thermal sensitivity meter：Used to test the reaction behavior of samples at different temperatures, such as thermal decomposition, combustion, etc. Through testing, its thermal stability, thermal sensitivity and other properties can be understood, providing a basis for subsequent optimization and improvement. Local thermal sensitivity testing is a method of evaluating the reaction characteristics of energetic materials under local heating conditions. It can be used to characterize the difficulty of combustion or explosion of a sample under the action of a local heat source.

13. Slow burning test instrument: The burning test of energetic materials is designed to test the sensitivity of chemicals to unexpected thermal stimuli and the severity of their reactions in manufacturing, storage, transportation, and practical environments.