FUJIFILM Prescale reveals contact pressure and pressure distribution through changes in red colour density. Place the film between contacting surfaces to identify uneven loading and compare contact patterns.
FUJIFILM Prescale helps make contact pressure visible. When pressure is applied, the film develops a red impression whose colour density varies with the applied pressure. This allows users to examine contact patterns and pressure distribution across a surface.
Contact Seacom Process Instruments in Malaysia for help selecting a film grade for your inspection conditions.
Pressure breaks microcapsules containing colour-forming material. The released dye reacts with a developer to produce a red image. Compare the result with the appropriate reference chart, taking the test temperature and humidity into account.
Two-sheet type: two separate films carry the colour-forming and colour-developing layers. Place their coated surfaces facing each other for measurement.
Mono-sheet type: the colour-forming and developing layers are combined on a single film.
Select a grade that covers the expected contact pressure. The table below lists the standard Prescale range.
| Film grade | Pressure range | Film type |
|---|---|---|
| 5LW | 0.006–0.05 MPa | Two-sheet |
| 4LW | 0.05–0.2 MPa | Two-sheet |
| LLLW | 0.2–0.6 MPa | Two-sheet |
| LLW | 0.5–2.5 MPa | Two-sheet |
| LW | 2.5–10 MPa | Two-sheet |
| MW | 10–50 MPa | Two-sheet |
| MS | 10–50 MPa | Mono-sheet |
| HS | 50–130 MPa | Mono-sheet |
| HHS | 130–300 MPa | Mono-sheet |
Selection note: MW and MS cover the same pressure range but have different film constructions. Confirm the required grade and supply format when ordering.
| Parameter | Specification |
|---|---|
| Accuracy | ±10% or less when measured using a densitometer at 23°C and 65% RH. |
| LLLW, LLW, LW, MW, MS and HS | Recommended temperature: 20–35°C. Recommended humidity: 35–80% RH. |
| 5LW and 4LW | Recommended temperature: 15–30°C. Recommended humidity: 20–75% RH. |
| HHS | Recommended temperature: 15–30°C. Recommended humidity: 35–70% RH. |
Follow the instructions supplied with the selected grade, including the pressure application time and reading procedure. The stated accuracy applies under the specified measurement conditions.
Use the following examples as a starting point when discussing your test arrangement and required pressure range.
Placing the film at the test interface produces an impression of the contact pressure pattern after tightening.
A pressure impression can help identify uneven contact around a flange or sealing surface.
The developed film shows the contact pattern between the tyre and the test surface.
Compare the impression across the roller width when investigating uneven contact or adjusting the equipment.
Send us the following details so we can help check the appropriate film:
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