IMultiparametric chemical indicator for formaldehyde

Class 4 indicators are intended to demonstrate that the material has been exposed to a vaporized formaldehyde process and react to all critical process variables (time, temperature and concentration of formaldehyde in the vapor). They can be used to distinguish between processed and non-processed items. The back of the strip is removable and exposes the adhesive for easy application of the strip to packages during exposure and/or for record-keeping purposes after exposure.

Class 1 indicator requirements:

• ≥70°C, ≥15 minutes, ≥1.0 M vaporized formaldehyde

Class 4 indicator requirements:

• ≥70°C, ≥15 minutes, ≥1.0 M vaporized formaldehyde