Heat Sink
Pressurex® is a thin flexible mylar film that reveals pressure distribution and magnitude between any two contacting surfaces. Pressurex® can aid significantly in performing thermal analysis between a heat sink (transistor) and heat source. Examining a typical heat sink/heat source interface reveals microroughness and planarity problems that can not be detected by the human eye alone. Pressurex® can determine exactly how much pressure is occurring atany point of the interface surface, helping balance the tradeoff between greater thermal conductivity (more tension at the interface) and substrate cracking due to overtensioning of the mounting bolts. Finally, Pressurex indicates how interface materials compress and comply under load.
Upon the application of force the microcapsules rupture, producing an instantaneous and permanent color change. Like Litmus paper, the color intensity of Pressurex® is
quantifiable; the color intensity reveals precisely what pressure level (PSI or kg/cm²) was applied at any discrete point on the surface of the film.
Specifications
| Temperature Range | .41ºF/5ºC to 95ºF/35ºC (higher for brief exposure) |
| Humidity Range | 20 to 90% RH |
| Gauge (thickness) | 4 8, 20 mils |
| Spatial Resolution | 5 to 5 microns |
| Substrate | Polyethilene Terephthalate (PET) |
| Accuracy | ± 10% visual, ± 2% utilizing optical measurement system |
| Shelf life | 2 Years |
Film Type - Pressure Range
| Micro | .2 - 20 PSI /(14 - 11.4 kg/cm²) |
| Ultra Low | 28 - 85 PSI/ (2 - 6 kg/cm²) |
| Super Low | 70 - 350 PSI /(5 - 25 kg/cm²) |
| Low | 350 - 1.400 PSI/ (25 - 100 kg/cm²) |
| Medium | 1.400 - 7.100 PSI /(100 - 500 kg/cm²) |
| High | 7.100 - 18.500 PSI /(500 - 1.300 kg/cm²) |
| Super High | 14.000 - 43.200 PSI (984 - 3.000 kg/cm²) |
Refer to our applications menu for more detail on uses of Pressurex® for pressure measurement.
NOTE: You may also have read about pressure sensitive paper, tactile pressure indicating sensor film, pressure sensitive film, Fuji Paper or Fuji Prescale. These terms are synonymous with our Pressurex® pressure indicating film.
