• Maximum Temperature: 1121°C (2050°F)
  • Volts: 230
  • Watts: 20 kw
  • int_dims: 18X19X24
  • ext_dims: 38X45X56
  • controls: Digital
  • high_limit: Analog

Vestibule Blocks for all Diffusion Furnaces

Product Overview

Thermcraft’s vestibule blocks and insulation tubes are high quality, high purity, vacuum formed ceramic fiber with a low sodium inorganic bond. Made to customer specifications, these are available to fit all diffusion furnaces and specialty insulation applications.

Top Quality…Prompt Delivery…Reasonable Prices…Custom Made to Customer Specifications…

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Diffusion Elements

Product Overview


A = Overall Length

B = Outside Diameter

C = Inside Diameter


A = Overall Length

B = Small Outside Diameter

C = Inside Diameter

D =Large Outside Diameter

E = Small Outside Diameter Length

F = Large Outside Diameter Length

Stepped or straight blocks are available for either load or source end. Inside diameters are available in 1/8″ increments. Eccentric I.D. blocks are also available.