December, 2019


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Page 53 Avoiding Five Common Mistakes in ESD Control Continued from previous page


equipment selected shall be capable of making the measurements defined in the compliance verifica- tion plan.”


Improperly reusing shielding bags or using shielding bags with holes or scratches. ESD shielding bags are used to store and transport ESD-sensitive items. When used properly, they create a Faraday cage effect, which causes charges to be conducted around the outside surface. Since similar charges repel, charges will rest on the exte- rior and ESD-sensitive items on the inside will be safe. However, if the shielding layer of an ESD shielding bag is damaged, ESD-sensitive items on the inside will not be protected. Reusing shielding bags is acceptable, as long


as there is no damage to the shielding layer. Shielding bags with holes, tears or excessive wrin-


function of all work surfaces. Ensure that the cleaning products used to not leave an electrically insulative residue, which is common in some household cleaners that contain silicone,” states the ESD TR20.20 handbook. It is important to train all personnel using


ESD surfaces should be cleaned with specific cleaners. Many household cleaners contain silicone which can create an insulative surface, negating the effects of an ESD mat.


ESD products or equipment to follow proper ESD control programs and maintenance procedures to avoid common ESD control mistakes. Basic ESD control principles should be followed for an ESD control program to be successful, which includes grounding conductors, removing, converting or neutralizing insulators with ionizers, and shield- ing ESD-sensitive items when storing or trans- porting them outside the EPA. Contact: Desco Industries, Inc., 3651 Walnut


Avenue, Chino, CA % 909-627-8178 E-mail: matt.hempel@desco.com Web: www.descoindustries.com r


Booth 2536


Located in Wearing an ESD coat is not


enough. The garments must be properly grounded.


kles should be discarded. Use a sys- tem of labels to identify when the bag has gone through five handling cycles. ESD shielding packaging is to be used particularly when transport- ing or storing ESD-sensitive items outside an ESD protected area (EPA). According to ANSI/ESD fore-


word, “Transportation of ESDS items outside an ESD protected area (here- after referred to as “EPA”) requires enclosure in static protective materi- als, although the type of material depends on the situation and destina- tion. Inside an EPA, low charging and static dissipative materials may pro- vide adequate protection. Outside an EPA, low charging and static dissipa- tive shielding materials are recom- mended.”


Using household cleaners on ESD matting. The use of standard house- hold cleaners on ESD matting can put an ESD control program at risk and damage the ESD properties of items. Many household cleaners contain sil- icone or other insulative contami- nants, which create that lovely shine when wiping surfaces in a home. The problem is that silicone and other chemical contaminants can create an insulative layer that reduces the grounding performance of the mat. Extra money should not be


spent on ESD matting to then coat it with an insulative layer by using household cleaners. There are many specially formulated ESD surface and mat cleaners available on the market. Only clean ESD working surfaces using these types of cleaners. “Periodic cleaning, following the


manufacturer’s recommendations, is required to maintain proper electrical


February 4-6 San Diego Convention Center CA


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