Prescale Pressure Measurement Film

Prescale allows you to easily measure pressure distribution and range. Created using Fujifilm’s advanced thin film coating technologies, the pressure inspection sensor on the entirety of the film allows you to confirm pressure distribution of the entire surface at a glance. The colour appears red where pressure is applied, and the colour density varies according to the amount of pressure. To cover a wide pressure range (0.006 to 300 MPa), we supply nine types of Prescale.

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 colour-forming material and colour-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 colour-forming material and developer.

How Prescale Works

The microcapsules in the colour-forming layer are broken by pressure, and the colourless dye is absorbed into the developer, causing a chemical reaction to produce a red colour. The microcapsules containing the colour-forming material are adjusted to varying sizes and strengths, and is coated uniformly, producing a colour 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.

How To Use Prescale

Illustration ~ How To Use

Cut the Prescale or Prescale Sheets into the shapes needed for measurement.

Insert the Prescale between the surfaces to be measured.
Apply normal operating pressure.

Remove the Prescale.

You can now see the pressure and its distribution.

Pressure measurement film Prescale Sheet type

Prescale Sheets are a version of Prescale that are pre-cut into easy-to-use sizes. It is recommended for first-time users and for small-scale applications. To cover a wide pressure range (0.2 to 300 MPa), we supply six types of Prescale Sheets.

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Product Name/Model	Prescale (Two-sheet type/Mono-sheet type)
Precision	±10% or less (measured by a densitometer at 23°C, 65% RH)
Recommended Temperature	20°C to 35°C^*1
Recommended Humidity	35% RH to 80% RH^{2 3}

*1 Ultra extreme low pressure (5LW) / Extreme low pressure (4LW) / Super high pressure (HHS): 15°C–30°C
*2 Ultra extreme low pressure (5LW) / Extreme low pressure (4LW): 20% RH–75% RH
*3 Super high pressure (HHS): 35% RH–70% RH

< How to calculate pressure value (MPa) >

We supply nine types of Prescale and six types of Prescale Sheets for use depending on the pressure range.
Each product is made for a certain pressure range (MPa). Customers must confirm the pressure value of their application environment.

1 MPa = 1 N/mm² ≒ 10.2 kgf/cm²

To obtain the pressure value, you need the mass (kg) or newtons (N), as well as the surface area (mm² or cm²).
For instance, if 100 kg is applied on a 100 mm² (1 cm²) surface, the calculation is 100 kgf/cm².
Divide this value by 10.2. The formula is 100 kgf/cm² / 10.2 = 9.8 MPa.