Proper storage of pressure measurement film is essential to maintain its sensitivity and ensure accurate pressure analysis. Improper storage conditions can lead to premature chemical reactions, reduced color response, or unreliable measurement results.
Avoid Direct Sunlight and High Temperatures
Pressure-sensitive film should always be stored away from direct sunlight and heat sources. Exposure to high temperatures may accelerate the internal chemical activity of the microcapsules, which can reduce sensitivity and affect color development during testing.
For long-term storage, it is recommended to keep the film in a cool and dark environment, ideally below 15°C. Stable temperature conditions help preserve the original performance characteristics of the film.
Unused L-sheets and K-sheets should be returned to their original protective packaging immediately after use:
- L-sheets: stored in black light-proof bags
- K-sheets: stored in blue protective bags
Both should then be placed back into the packaging box to minimize exposure to light, humidity, and environmental contamination.
Avoid Contact with Reactive or Contaminating Materials
During storage, pressure measurement film must be kept away from substances that may interfere with its chemical coating. Contact with certain materials can cause unwanted reactions or reduce measurement reliability.
Avoid exposure to:
- Carbonless copy paper
- Water, oil, or industrial solvents
- Chemical substances or cleaning agents
- Plastics containing plasticizers
- Rubber materials or erasers
- Oil-based inks
These materials may either damage the coating surface or trigger partial color development, even without applied pressure.
Storage of Developed K-Sheets
After testing, developed K-sheets should be handled and stored carefully to preserve the recorded pressure data.
It is recommended to store them in paper envelopes rather than plastic bags, as paper allows better moisture control and reduces the risk of surface damage.
When storing multiple samples:
- Do not allow developed surfaces to touch each other
- Place clean white paper sheets between each sample
This prevents color transfer, contamination, or mechanical damage to the recorded pressure pattern.
Fading and Long-Term Data Preservation
Over time, the color developed on pressure measurement film may gradually fade due to environmental exposure and natural chemical changes.
For critical applications or record-keeping purposes, it is strongly recommended to:
- Scan the developed film at high resolution
- Take photographs under consistent lighting conditions
Digital records help preserve measurement results for future analysis, comparison, or reporting, especially in quality control and process validation scenarios.
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