Choosing the right humidity indicator card requires prioritizing application scenarios, environmental compliance, detection accuracy, and color-changing characteristics. For most electronic components, precision instruments, or export products, cobalt-free environmentally friendly humidity indicator cards are recommended to ensure compliance with international regulations and safe use.
Clarify Application Scenarios and Protection Requirements
Different industries have significantly different humidity control requirements. The appropriate specification should be selected based on the specific application:
Electronic product packaging (e.g., PCBs, ICs, sensors): A 6-point humidity card (10%~60%RH) is recommended for comprehensive monitoring of low-humidity environment changes.
Pharmaceuticals and biological products: High sensitivity and traceability are required; composite indicator cards with irreversible warning functions are recommended.
Long-term warehousing or transportation: Prioritize cobalt-free models with good stability and long-lasting color change to avoid frequent replacements.
Focus on Technical Parameters and Specifications
Number and Range of Indicator Points
Three-point card: Suitable for specific threshold monitoring (e.g., 5%/10%/60%RH)
Six-point card: Covers a wider humidity gradient, suitable for multi-level judgment
Color Change Reversibility
Reversible: Can recover blue color in dry environments, supports reuse
Irreversible: Once the color changes, it is permanently retained, used to record historical humidity exposure
Size and Material
Common size: 103mm × 38mm × 0.04mm, paper-based material, thin and easy to place
Surface coating design prevents chemical backflow and improves durability