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I usually delete spam from my inbox without reading it, but recently an email caught my eye, touting the new Pressurex Tactile Pressure Indicating Sensor Film. I looked up the website and it looks like a handy tool for determining whether two surfaces mate well. The film has tiny “microcapsules.” When you tighten or clamp two surfaces together with the film in between, it makes the microcapsules rupture and makes a permanent picture of the forces on the surface.

Here’s an article showing the applications in assessing disc brake contact with the rotor. It seems like it would be great for any automotive assembly where you want even pressure around a gasket. It’s also a good way to diagnose any adhesive bonding problems, especially when the members are clamped as the adhesive dries. The site says they’ll provide free samples, and free is a great price.

Pressurex [Website]


5 Responses to Pressurex Tactile Pressure-Indicating Sensor Film

  1. Ben says:

    So anybody else use lipstick for this? I learned the trick a long time ago for marking cut-outs in dry wall and have since used it for lots of stuff. Put a little lipstick on what you are trying to measure and push your paper or dry wall or whatever against it and the lipstick transfers right over. Works good for making gaskets on the car too.

    Now you know why that gnarly old contractor has hot pink lipstick in his tool box. Uh, at least i hope that’s why.

  2. Ben says:

    Ah, maybe I should have RTFA first 🙁

  3. Chris says:

    I assume you meant “assessing brake pad contact with the rotor”; the “disc” part of a “disc brake” *is* the rotor :-p


  4. Randy says:

    This is good stuff. We used it for engineering and forensic analysis.

  5. wackyvorlon says:

    The old-school technique is to use spotting blue. A thin coating is spread on the one surface, the two surfaces are put together and taken apart. The blue transfers to where the parts mate. There’s also plastigage, a plastic wire that is crushed when the parts are bolted together. The width of the crushed gauge indicates how far apart the two pieces are.

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