BeJu Bergmann Junk Test Apparatus

BeJu Bergmann Junk Test Apparatus

The BeJu™ (Bergmann Junk) test apparatus is used for the determination of the chemical stability of firearm and rocket propellants by the qualitative analysis of gaseous products evolved during the thermal decomposition of a sample. The sample is heated in a heavy, aluminum heating block at 120 or 132 °C.  Gaseous products evolved during the thermal decomposition are absorbed into a glass adaptor filled with water. The amount of gaseous products is then determined by quantitative volumetric analysis of the resulting aqueous solution. The typical sample mass is 5g and the measured temperature ranges between 120 - 132 with a testing period between up to 6 hours.


The test is designed especially for the determination of the thermal stability of single-base and double-base firearm and rocket propellants during in-service surveillance, manufacturing, quality control and research and development. Additionally, if desired, it can be used for testing other materials and mixtures containing nitrocellulose, nitroglycerine, or other organic nitrates.

The BeJu™ is straightforward and trustworthy--it is an excellent selection for an independent complementary method to the vacuum stability test (STABIL VI®) or the high performance liquid chromatography apparatus (HPLC-OZM1220™).


The BeJu™ instrument consists of a heavy, aluminum heating block with 10 test tube holder holes. The glass test tubes are filled with samples and placed inside the heating block. The tubes are enclosed using a special glass adaptor filled with distilled water. The temperature of the block is administered by a control unit which is comprised of an operational controller and a limit controller. The limit controller operates an independent alarm circuit which halts the heating process if temperatures were to accidentally increase above specified safety limits. Calibrated mercury thermometers or calibrated digital thermometers may be used to correct and control the temperature of the heating block.

The BeJu’s™ standard heavy, aluminum heating block can hold and measure up to 10 samples (with individual time exposures for each one).  Heating blocks with a different desired number of holes are available on request.



  • Safer operation-the aluminum heating block is much safer compared to a traditional reflux heating bath
  • Customized heating blocks available upon request
  • High precision and accuracy of the heating block temperature
  • Independent alarm circuit led by the limit controller eliminates prolonged accidental overheating


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