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The ULTRAMIC® ceramic heaters from Watlow® are designed for thermal applications where the high performance of an advanced ceramic heater is required to ensure optimal effectiveness of the equipment and process.

ULTRAMIC ceramic heaters are constructed of aluminum nitride (AlN) and incorporate a thermally matched proprietary heating element that provides maximum performance in challenging applications. AlN is especially suitable for applications requiring a clean, non-contaminating heat source. Additionally, the excellent geometric stability ensures consistent part-to-part thermal contact during heating cycles.

Watlow AlN ceramic heaters can operate up to 400°C (752°F) with an ultra-fast ramp rate of up to 150°C (270°F) per second depending on the application, heater design and process parameters. In addition to excellent thermal characteristics, ULTRAMIC ceramic heaters have high electrical isolation and typically provides superior chemical resistance as compared to traditional metal heaters.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Aluminum Nitride  752 400 1000 155
  • Operating temperature up to 400°C (752°F)
  • Watt densities to 155 W/cm² (1000 W/in²)
  • Temperature ramp rate up to 150°C (270°F) per second (depending on application parameters)


  • Wire and die bonding
  • Integrated circuit (IC) chip testing
  • Mass spectrometry
  • Medical devices
  • Plastic welding/sealing
  • Respiratory therapy equipment

Features & Benefits:

Features Benefits
Robust AlN ceramic
  • Creates a homogeneous assembly for atmospheric and vacuum applications
  • Provides durable heater construction and thermal transfer necessary for high temperature and long heater life
  • Supports the design of a high watt density, fast responding heater in a very small package
Superior electrical performance
  • Assures low leakage current
  • Enables high breakdown voltage
High thermal conductivity
  • Makes for an ultra-fast temperature ramp rate of up to 150°C (270°F) per second depending on application parameters)
  • Allows for quick cool-down
  • Provides extremely uniform temperatures over the heater’s surface
Type K thermocouple integrated into assembly
  • Ensures reliability of heater/sensor interface
  • Improves accuracy with optimized temperature sensing
  • Provides high response rate in ramping applications
UL® and CE agency compliance
  • Meets global safety standards
  • Includes RoHS compliance