Frequently Asked Questions

Microgrid® – Answers to Frequently Asked Questions


    What variables can be changed to increase or decrease the weight per unit area of a given product?

    Increases or decreases in the base metal thickness and/or strand width are two of the most frequently used methods of accomplishing this goal… especially when the appropriate metal and mesh size have already been identified. Please let us know if the weight is important in the final application and we will work with you to define the other variables.

    I would like to make a change in the amount of surface area per unit area.How can that be accomplished?

    Let’s say for instance, you would like to increase the amount of surface area. An increase in the strand width will increase the surface area. Choosing a smaller mesh size or LWD will make a more significant change as well.

    The sample I have is 5 Al 10-125. The 125-mesh size is what I need for my process but I would like to increase the percentage of open area slightly. What can you do?

    The first variable that we would change is the strand width. A decrease in the strand from 10 mils down to 7 mils will increase the open area approximately 10%, assuming the SWD stays constant.

    How do I order Dexmet MicroGrid® precision expanded foils or PolyGrid® Thermoplastics?

    MicroGrid®, and PolyGrid® are OEM products, engineered, configured and custom manufactured to stringent specifications developed in unison with our customers. But, once we have determined the product code, all we need is the desired width and quantity. The quantity is always determined by length of the material required as opposed to weight.


    I am interested in Dexmet EM for its superior electrical, shielding or heat transfer properties. What variables can be changed to increase the conductivity across the width as well as in the roll direction?

    An increase in the base metal thickness and/or strand width will result in an increase in the conductivity in both directions. Altering the SWD or LWD can make more subtle changes. In general, the conductivity will be greater across the width than in the roll direction by about 2 to 1.

    What are the methods used to protect aircraft from lightning strikes?

    There are three methods that can be used to ensure that an aircraft is properly protected from lightning strike damage: capacitor filtering, diode suppression and shielding. If proper precautions are taken, lightning strike damage can be greatly diminished or completely avoided.

    What if I need a product with conductivity or resistance that is equal in both directions?

    You may need a “Distex Brick”” product. The controlled stretch will decrease the LWD and increase the SWD. This change in the geometry of the diamond will result in the desired characteristics.


    Does Dexmet offer a corrugated product?

    Dexmet offers a process variation of corrugating their precision expanded materials. This process variation was developed for high-performance applications that require the expanded material to be much thicker or larger, that require more surface area and better cross-directional flow.

    What expanded plastics do you offer for caustic environments?

    For applications requiring high temperatures to filter caustic gases or fluids, such as the semiconductor, chemical processing, and petroleum/gas industries, the filtration media typically being utilized is polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), and ethylene chlorotrifluoroethylene (ECTFE). Dexmet also offers PEEK which provides a superior combination of mechanical strength, chemical and high temperature resistance.

    What effect does tarnish on copper have on product parameters?

    Through in-house testing we have found that levels of tarnish appear to have little or no effect on surface resistance.

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