Open Stainless-Steel Trays

Filling Requirements

Low speed filling in Class-A environment, close to dryer loading area, required to minimize splashing

Tray Handling

Requires multiple slow and careful manipulations to fill, load, download, and transport open trays without incident

Open trays cannot be stacked

Impact on Thermal Transfer

Metal trays may warp creating inconsistent tray-to-shelf contact, resulting in poor thermal transfer


Highly vulnerable to cross-contamination of product


Highly vulnerable to fly-out, which can:

  • significantly reduce production yields
  • require extra cleanup after fly-out

Product Recovery

Spatula use requires a slow, careful process

Remedial Cleanings

After spills or fly-out, cleaning of freeze dryer requires additional validation, consuming worker time and resources