Irreversible humidity indicator cards

Signals and indicators – Indicators – Chemically activated type

Reexamination Certificate

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Details

C116S219000

Reexamination Certificate

active

06877457

ABSTRACT:
An irreversible humidity indicator card comprising an intermediate carrier member containing one or more holes, a clear, water vapor permeable first outer layer secured to the first side of the carrier member, a deliquescent material contained within the holes in the carrier member, a dark colored, absorbent sheet material secured to the back side of the carrier member to cover the holes in the carrier member and a second outer layer which covers the colored absorbent sheet material and a portion or all of the back side of the intermediate carrier member.

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W.B. Abel, Chemical Maximum Humidity Indicator Update Report, BDX-613-1989.

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