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Foldable rubber ESD mat

Modifying a rubber ESD mat to fold into a tool case

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ESD mats are not only important to prevent damage to your electronics, rubber ones also make great work surfaces for soldering. This project alters a rubber mat to fold and fit inside a soldering tool case for portability.

I've had a portable tool case with dual soldering irons, tools and pretty much everything I need for soldering. Often though, I would be working somewhere that I needed to protect the table when working. Scrap cardboard often worked, but it was not a great solution, and not great for ESD. When cleaning out a lab, a rubber ESD mat was being tossed out because a large portion of it was damaged, and it was no longer useful on a bench. Part of it however was in reasonable shape, and it occurred to me that I could convert it to a portable mat that fits in my tool case.

Certainly one can just roll a mat and put it in a case, but this takes much more room, and results in a curled mat that you have to flatten when you want to use it. Using the fact that a good quality mat is a laminate of rubber sheets, this project simply scores it so it folds neatly, and when laid out, sits flat.

This cannot be done with a PVC mat, or mats which do not have a conductive bottom side.

  • 1 × Rubber ESD mat
  • 1 × Grounding wire for ESD mat

  • 1
    Step 1

    Supplies: Start with a rubber ESD mat, either the final size you want, or larger to cut from it. You will also need the associated grounding cable, and appropriate snap.

    Tools: Ruler and straight edge, and a knife. I used a curved blade for an x-acto type knife to make it easier and smoother to get the correct depth. You will also need a cutting surface if you are reducing the size of your mat, such as scrap cardboard or a cutting mat.

  • 2
    Step 2

    Size your mat: If your mat is already the final size, you can skip this step. Place your mat on a cutting surface, and measure out the final size you want. Using the straight edge, score and cut through the mat with the knife. The rubber ESD mat will offer resistance to cutting, but will cut cleanly. Optionally use this step to practice cutting part way through the mat, getting a consistent depth.

  • 3
    Step 3

    Figure out your folding points: To fit my tool case, I made my mat 16 inches deep, and I used the width of the original mat section that was still good, 28 inches. My goal was to have it fold to 16 inches by 10 inches. If you have a single fold, you can use whatever size you wish. If you have two or more folds like I do, plan out the measurements so that the layers do not cause a problem in folding due to the thickness of the mat. For instance, I would not want to make it three 10 inch segments because the second fold would not fold flat due to the thickness of the first. You can prevent this issue by making the first section shorter. In my case, my sections were 10, 10 and 8, with the 8 end folding first/inside.

    Important: Your scoring must be done on the dissipative(top) side of the mat, and not on the conductive(bottom) side of the mat. If you were to cut into the conductive part, you would no longer have a good connection between your sections, and it would not provide good ESD protection.

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