HGT 915

Gum Test

Test Methods
ASTM D381, EN 5, IP 131, IP 540, ISO 6246


Safe, simple quality control of aviation fuels & gasoline


The Herzog Gum Test Apparatus is designed to measure evaporation residue in aviation fuels, motor gasolines, and other volatile distillates in accordance with ASTM D 381, ISO 6246, EN 5 and IP 131 test methods.
The HGT 915 uses air evaporation, while the HGT 917 offers the versatility of either air or steam evaporation. Both models are capable of testing three 100 ml samples simultaneously.

Results indicate the likelihood of induction system deposits and potential sticking of intake valves. Block temperature is factory set for a temperature of approximately 162ºC in air evaporation units and 232ºC in steam evaporation units. The temperature of the evaporation air or steam is controlled by pressure regulation. Model 917 includes an integral steam super heater as well as a built-in switch which permits changeover from air to steam evaporation when required.


Herzog’s Gum Test Apparatus consists of an aluminum block with ducts for air or steam flow. Sample beakers are placed in wells within the block and hot air or steam is blown across the samples, causing rapid evaporation of volatile constituents. The beaker’s weight is then compared to its empty weight; the difference is existent gum.




Features & Benefits

  • Three test stations
  • Choice air or steam evaporation
  • Aluminum heating block with electronic heat control
  • Integral steam super heater
  • Includes beaker, shielded thermometer and precision pressure
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