Prescale : Features | Fujifilm [Thailand]

Structure and principle

Structure of Prescale

There are two types of Prescale: the two-sheet type and the mono-sheet type. The two-sheet type is composed of two films of which are respectively coated with color-forming material and color-developing material. This type is used by placing the sides coated with the chemical agents over each other. The mono-sheet type is a film with a single base film with a coating of color-forming material and developer.

How Prescale works

The microcapsules in the color-forming layer are broken by pressure, and the colorless dye is absorbed into the developer, causing a chemical reaction to produce a red color. The microcapsules containing the color-forming material are adjusted to varying sizes and strengths, and is coated uniformly, producing a color density that corresponds to the amount of pressure.

Pressure chart

By checking the standard chart, the pressure value can be confirmed visually.

for medium-pressure [MW]

* The parts represented by the dotted lines may exceed the allowable error range, so it should only be used as a reference.
* Prescale is used by selecting curves A, B, or C depending on the temperature and humidity conditions.
* The measured pressure reaching time for continuous pressure of Ultra extreme low pressure (5LW), extreme low pressure (4LW), and ultra extreme low pressure (LLLW) is 5 seconds, and the measurement maintenance time is 2 minutes.
* Super high pressure (HHS) is only for continuous pressure.