3M™ Water Contact Indicator Tape 5559i is an ultra-thin, 5.0 mil (127 micron) thick tape used to indicate water contact. The tape turns from white to red upon direct water contact. It is designed for transparent substrates.
Features and Benefits
Highly absorbent, transports water to show indications
Very high bond strength to most surfaces including low surface energy plastics such as polypropylene and powder coatings
Rotary die cuttable
Thinner to enable slim electronics device design
No film top layer
"i" stands for inverted. It is designed transparent substrates to view indication from opposite side