Batch Control Helix Test (BCHT) for formaldehyde


Helix based tests are recommended to use in every cycle of the formaldehyde sterilizer.

Indicator reaches the end-color when reacting to 10mg/l of formaldehyde at 60°C in 20 minutes.

Failures which are picked-up by the BCHT are:

  • Sterilization temperature too low
  • Sterilization holding time too short
  • Sterilization gas concentration too low
  • Insufficient vacuum in depth and in number of vacuum pulses
  • Insufficient air removal from hollow devices
  • Insufficient sterilant penetration in hollow devices
  • Leakage of piping/valves/door seals

The BCHT consists out of the following items:

1 piece of Helix device (Teflon with 1,5 mtr long tube) for 500 cycles, 100 pieces of Chemical indicator strips with adhesive on the back, 1 piece of Direction For Use (DFU) with color change images.

Additional information


BCHT FORM 100 indicators