HAST (Highly Accelerated Stress Test) chambers reduce the time it takes to complete humidity testing for semiconductors. By elevating temperatures above 100°C and increasing the pressure, simulation of normal humidity tests can be made while maintaining the same failure mechanisms. Tests can be completed in days, not weeks. Our HAST systems have a modern design that's easier to use:

  • Automatic humidity filling
  • Automatic door lock
  • A round workspace, allowing wider sample boards to be loaded
  • Convenient, hermetic power-pin system for bias testing

We now offer an “Air HAST” modification for faster testing of lead-free solder whisker resistance to humidity.

Features for HAST - Highly Accelerated Stress Test Chambers
  • Unsaturated or saturated humidity control
  • Multi-mode 'M' system controls humidity (via wet bulb/dry bulb), even during heat-up and cool-down. Fully conforms to EIA/JEDEC test method A110 & 102C.
  • Touch-screen controller with temperature, humidity, and count-down display. Includes Ethernet interface.
  • Specimen power terminals, allows power-up of specimens

Cabinet Features:

  • Inner cylinder and door shield protect specimens from dew condensation
  • Interior is cylindrical for maximum product loading
  • Two stainless steel shelves
  • Set of casters for easy movement of the chamber (except double units)

Safety Features:

  • Overheat & over-pressure protectors
  • Door lock safety mechanism to prevent opening of the door while the chamber is pressurized
  • Specimen power control terminal: shuts down the product power in the event of an alarm

Two vessel sizes to choose from. Double units give twice the test capacity without increasing footprint

Related Resource Center Articles
Model Number Interior Dimensions
(W x D x H)
Interior Volume Temperature Range Humidity Control Notes
EHS-212M 11.5" x 11.6" x 11.5" 0.64 cu. ft. 105 to 142°C Yes Pressure: 0.02 to 0.196 MPa gauge (0 to 28 psig)
EHS-222M 15.5" x 16" x 15.5" 1.62 cu. ft. 105 to 142°C Yes Pressure: 0.02 to 0.196 MPa gauge (0 to 28 psig)
EHS-212MD 11.5" x 11.6" x 11.5" 0.64 cu. ft. 105 to 142°C Yes Pressure: 0.02 to 0.196 MPa gauge (0 to 28 psig) . Two chambers in one unit.
EHS-222MD 15.5" x 16" x 15.5" 1.62 cu. ft. 105 to 142°C Yes Pressure: 0.02 to 0.196 MPa gauge (0 to 28 psig) . Two chambers in one unit.
EHS-412M 11.5" x 11.6" x 11.5" 0.64 cu. ft. 105 to 162°C Yes Pressure: 0.02 to 0.392 MPa gauge
EHS-412MD 11.5" x 11.6" x 11.5" 0.64 cu. ft. 105 to 162°C Yes Pressure: 0.02 to 0.392 MPa gauge (0 to 57psig). Two chambers in one unit.
EHS-431M 22" x 22" x 22" 4 cu. ft. 105 to 162°C Yes Pressure: 0.02 to 0.392 MPa gauge. Cylindrical workspace (Replaced model #: TPC-432ZM)

      Click model number for details, including metric & english units.

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