HUMIDITY/MOISTURE INDICATORS

Many pharmaceuticals, dried foods and other perishables, such as potato chips are sensitive to moisture/humidity. The shelf life decreases significantly if they are exposed to high humidity. Our humidity indicators undergo a color change with total exposure to moisture. Time required for the color change can be varied from a few minutes to a few weeks under normal ambient humidity.

UNIQUE FEATURES OF THE HUMIDITY INDICATORS

Applications

• Tamper indicator (if a bag of container is opened it will change color)
• Indicator for moisture sensitive foods, e.g., freeze dried foods, potato-cheeps and certain electronic components
• Pharmaceuticals
• Cigars and cigarettes

Color

• Irreversible color change, e.g., Blue-to-red
• Changes color upon certain exposure to humidity
• No color change below certain level of humidity

Time required for the color change

• Almost instant (e.g., seconds) in humid day of summer
• Time required for the color change can be varied (e.g., from minutes to days)

Temperature

• Temperature for the color change can be varied (e.g., +50 to –0^oC)
• Can be designed to change color over a certain temperature range
• No color change below predetermined temperature

Preparation/Manufacturing

• Easy to make (a simple coating on a substrate)
• Commercially available equipment can be used to manufacture

Simplicity

• Single coating/layer thin device
• Can be prepared in form of labels

Additional information