Stainless Steel Wafer Cassettes
YES cassettes are designed to achieve accurate wafer support with minimal mass. Temperatures remain uniform throughout heat up and cool down applications minimizing hot/cold spots due to heat sinking. Cassettes are placed with the wafers vertically in YES-450PB Series ovens to facilitate the laminar flow process. The result is a better, more uniform process.

Why YES Cassettes Use Stainless Steel vs. Quartz

The outer surface of a quartz cassette vitrifies (changes over time due to heat). This causes two problems: increased particle introduction and cassettes become more brittle with each process run, until eventually the boat (cassette) breaks. When a quartz cassette breaks inside a process oven, it creates particle issues that are time-consuming and costly to fix.

Also, the quartz boat is an insulator. When the wafer becomes statically charged, there is nowhere for the charge to go and the charged wafers begin to attract particles. Stainless steel cassettes are a conductor, which allows the static charge on the wafer to dissipate when placed on a grounded surface.


  • Stainless steel
  • No particles
  • Automated or manual transfer
  • Uniform substrate temperature processing
  • Lightweight design, available in vertical and horizontal
  • Ideal for polyimide bake, BCB cure, copper anneal, as well as other cure processes


  • All 316L SST welded, electro-polished construction (no screws or fasteners)
  • Outside dimensions similar to SEMI standard plastic process carriers
  • Temperature: Although 316L SST is suitable up to 760º C, recommended continuous operating temperature without causing distortion is 500º C
  • Corrosion Resistance: 316L SST offers better resistance than 302 and 304 SST. Resists many industrial chemicals and solvents including – sodium and calcium brines, hypo chlorite solutions, phosphoric acid, sulfite liquors and sulfurous acids
  • 25-Wafer Cassettes are available in 2-inch, 3-inch, 100mm, 125mm, 150mm, 150mm short, 200mm, 200mm short, 300mm and 300mm load port
  • 13-Wafer Cassettes are available in 300 mm and 300mm load port
  • Cassette Handlers are available in 2-inch, 3-inch, 100mm, 125mm, 150mm, 200mm and 300mm
  • Load port adaptor and info pads assembly are available
  • Custom wafer cassettes are also available

YES Sales

Talk to one of our sales representatives about how the Cassettes can meet your application needs. When you are ready to run process tests, we would be happy to arrange a demonstration using your chemicals and samples.
Contact a YES Customer Development Center