MXC56789 Maximum Humidity Indicator Card - HUMIDITY INDICATOR CARDS

Description

MXC56789 provides a permanent visual record of moisture exposure in sealed packaging. It monitors 50, 60, 70, 80, 90% RH, helping identify whether a moisture-sensitive shipment has encountered conditions above its marked thresholds.

Each marked level contains a blue crystal. Sustained exposure above that level dissolves the crystal and produces a large blue spot. The supplier sheet describes exposure periods of 24 hours or more; this is a record of prolonged exposure, rather than an instantaneous peak reading. The maximum indication does not reset when conditions become dry, and the card cannot be reactivated.

The MXC56789 combines the permanent 50–90% RH record with a separate reversible 10–100% RH current-humidity scale. This allows an inspector to distinguish earlier exposure from the conditions when the package is opened.

Key specifications

• Indicator levels: 50, 60, 70, 80, 90% RH
• Card dimensions: 4 1/2 × 4 1/2 in
• Behaviour: Non-reversible maximum record plus reversible current humidity indication
• Pack configuration in supplier sheet: 25 cards per gallon can; 125 per case

Applications

• Recording peak humidity exposure while also showing the humidity at inspection.
• Logistics through changing climates and long-term storage of moisture-sensitive goods.
• Electronics, automotive and aerospace components, military supplies and conservation packaging.

Handling and storage

Keep the card sealed in its original container until installation. Store in a cool, dry place away from direct sunlight, liquid water and steam. Inspect the permanent indication after transport or storage and replace a used card rather than attempting to reset it.