{"id":5583,"date":"2016-11-25T08:00:28","date_gmt":"2016-11-25T14:00:28","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=5583"},"modified":"2016-12-08T10:40:36","modified_gmt":"2016-12-08T16:40:36","slug":"pc-electrically-conductive-speciality-coating","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/5583\/pc-electrically-conductive-speciality-coating\/","title":{"rendered":"Specialty Coatings: Protecting Against Electromagnetic Emissions"},"content":{"rendered":"<figure id=\"attachment_5585\" class=\"thumbnail wp-caption alignright\" style=\"width: 300px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-5585\" src=\"https:\/\/ulprospector.ul.com\/media\/2016\/11\/45828395_m-300x191.jpg\" alt=\"Learn about the applications of electrically conductive specialty coatings in the Prospector Knowledge Center.\" width=\"300\" height=\"191\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2016\/11\/45828395_m-300x191.jpg 300w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2016\/11\/45828395_m-768x488.jpg 768w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2016\/11\/45828395_m.jpg 868w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><figcaption class=\"caption wp-caption-text\">Copyright: <a href=\"http:\/\/www.123rf.com\/profile_nexusplexus\">nexusplexus \/ 123RF Stock Photo<\/a><\/figcaption><\/figure>\n<p>EMI shielding, thermal and electrical conductivity, electro dissipation &#8211; these type of specialty coatings are sometimes classified under the general heading of \u201csmart\u201d coatings. However, I define \u201csmart\u201d as coatings that respond \u201cintelligently\u201d to various mechanical, electrical, thermal and optical stimuli, and don\u2019t feel these fit in the category. An excellent article, \u201cSmart Coatings: The Next Big Opportunity in the Coatings Industry\u201d<sup>1<\/sup> can be found in <em>Paint &amp; Coatings Industry<\/em> magazine.<\/p>\n<h4>Electromagnetic Compatibility and Interference<\/h4>\n<p><strong>Electromagnetic compatibility (EMC)<\/strong> means an electronics device will perform according to the rated specification in its electromagnetic environment.<\/p>\n<p><strong>Electromagnetic Interference (EMI)<\/strong> occurs when an external source disrupts an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction. Electromagnetic interference can be categorized in two ways:<\/p>\n<ul>\n<li><strong>Broadband<\/strong> is unintentional radiation from sources such as electric power transmission lines and other high voltage electrical devices, electronic instrumentation and generators<\/li>\n<li><strong>Narrowband EMI<\/strong>, which transpires from radio and TV stations or cell phones, happens intentionally.<\/li>\n<\/ul>\n<p>Additional sources include: transmitters, doorbell transformers, toaster ovens, electric blankets, microwaves and touch controlled lamps. Electromagnetic interference at 2.4 GHz can be caused by 802.11b and 802.11g wireless devices, Bluetooth devices, baby monitors, cordless telephones, video senders, and microwave ovens.<\/p>\n<h4>EMI Shielding<\/h4>\n<figure id=\"attachment_5584\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 267px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-5584\" src=\"https:\/\/ulprospector.ul.com\/media\/2016\/11\/speccoatings-Picture1.png\" alt=\"Learn about &quot;smart&quot; specialty coatings from Marc Hirsch on Prospector Knowledge Center.\" width=\"267\" height=\"213\" \/><figcaption class=\"caption wp-caption-text\">Figure 1. Shielding screen can shield the radiation from mobile, radios<sup>2<\/sup><\/figcaption><\/figure>\n<p>Since 1979, the U.S. Federal Communications Commission (FCC) has imposed legal limits on electromagnetic emissions from all digital equipment in response to the increased number of digital systems that interfere with radio communications.<\/p>\n<p>In addition, as analytical and other sensitive equipment became more sophisticated and delicate, these devices required protection from external sources of electromagnetivity which would affect the performance.<\/p>\n<p>Although there have been methods to dampen the effect of EMI for many years, these included the use of metallic (often copper) Faraday cages (Figure 1), which are actually mesh structures. In the case of analytical labs, these had to be built in to the walls, which has led to the search for more cost-effective and simpler methods.<\/p>\n<p>The discovery of single- and multi-walled nanotubes as well as other conductive, carbonaceous materials, has led to the next generation of EMI-shielding materials. Metals such as copper, silver, nickel and nickel-plated carbon fibers, are also used in coatings, sealants and gaskets to mitigate or eliminate EMI, as well as dissipate Electrostatic Discharge (ESD)<sup>3<\/sup>. Other materials are also used, including conductive paints, sealants, and composites.<\/p>\n<h4>Beyond Electronics<\/h4>\n<p>Besides the obvious applications for electronics, EMI-shielding materials can also be employed to reduce the radar signature of vehicles such as aircraft, ships and ground vehicles. This, along with specific shapes, have enabled the military to effectively and wholly hide structures from radar detection. They can also be used to protect rooms from eavesdropping; which often use enhanced listening devices.<\/p>\n<p>In the metallic coating solution, it has to be filled sufficiently enough such that the particles are in close proximity to one another and touch. This means small particles, or a distribution to minimize volume voids, which then can affect rheology, etc.<\/p>\n<p>With carbonaceous materials, they also have to touch, but are less dense, and in the case of single- or multi-walled nanotubes, can be effective at a relatively low loading in coatings, including paints, sealants and adhesives.<\/p>\n<h4>Thermal and Electrical Conductivity<\/h4>\n<p>In some ways, electrical and thermal conductivity are similar. The types of technologies to achieve each in coatings can be comparable. Both are presented here, but an article in Coatings Tech, \u201cBeing Creative with Electrically Conductive Paint\u201d<sup>4<\/sup> offers a thorough explanation of the latter, should you want a more complete overview.<\/p>\n<p>Over the past several years, electrically conductive inks and paints have been developed to replace wiring in printed circuit board circuitry, which has helped decrease production costs and makes many electronic devices affordable.<\/p>\n<p>Thermal conductivity is important in mitigating heat build-up or removing heat as quickly as possible. One specific example is in air conditioning. Coils are typically copper, while the fins are aluminum. An increase in heat removal from the fins and coils will increase the efficiency of the heat exchange by 5-15 percent, thus reducing operating costs. For large (e.g. 20 ton) units, this translates to hundreds of thousands of dollars annually.<\/p>\n<p>On the other end of the spectrum is non-conductivity (insulation). This is the key to maintaining the temperature in equipment like an oven, refractory, or gas turbine. Many of these are ceramic-based, since they deploy high temperatures, and ceramic or glass microspheres provide an insulating air void.<\/p>\n<h4>Electrostatic Dissipation (aka Electrostatic Discharge)<\/h4>\n<p>When you walk across a carpet in a dry room and touch a metal object, static creates a spark. If the metal object you touched was a sensitive instrument, you may damage it, or throw off its calibration. For that reason, it is important to dissipate the charge, so it doesn\u2019t create a spark. Lightning is an extreme case of electrostatic dissipation as it hits an object on the ground. Sometimes a discharge is desired, as in corona discharge, which may be used to treat the surface of plastics to improve adhesion of an applied coating.<\/p>\n<p>Sparks around flammable gasses, medical equipment, integrated circuits, etc. are highly undesirable. For that reason, various techniques are utilized such as grounding, or ESD. Measures to eliminate the potential for sparks include grounding human workers, providing antistatic devices, and controlling humidity. Many sites utilize floor mats at the entranceways to areas of high sensitivity, but coatings can also be used to mitigate and eliminate the generation of small electrical discharges.<\/p>\n<p>In summary, these applications areas for coatings are not well-known, but very important to the markets in which they are used.<\/p>\n<h4>References:<\/h4>\n<ol>\n<li>\u201c<a href=\"http:\/\/www.pcimag.com\/articles\/102455-smart-coatings-the-next-big-opportunity-in-the-coatings-industry\" target=\"_blank\">Smart coatings: the next big opportunity in the coatings industry<\/a>\u201d<\/li>\n<li><a href=\"http:\/\/www.wovenwirecloth.org\/wovenwire\/shielding-screen.html\" target=\"_blank\">Shielding Screen information<\/a><\/li>\n<li><a href=\"https:\/\/www.cybershieldinc.com\/conductive-shielding-paint\/\" target=\"_blank\">Conductive Shielding Paint Application<\/a><\/li>\n<li>\u201c<a href=\"http:\/\/www.paint.org\/article\/creative-electrically-conductive-paint\/\" target=\"_blank\">Being Creative with Electrically Conductive Paint<\/a>\u201d<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>EMI shielding, thermal and electrical conductivity, electro dissipation &#8211; these type of specialty coatings are sometimes classified under the general heading of \u201csmart\u201d coatings. However, I define \u201csmart\u201d as coatings that respond \u201cintelligently\u201d to various mechanical, electrical, thermal and optical &hellip; <a href=\"https:\/\/ulprospector.ul.com\/5583\/pc-electrically-conductive-speciality-coating\/\">Continued<\/a><\/p>\n","protected":false},"author":26,"featured_media":5586,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":""},"categories":[16],"tags":[198,217],"ppma_author":[1242],"class_list":{"0":"post-5583","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-paint-coatings","8":"tag-coatings","9":"tag-formulating-advice","10":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>&quot;Smart&quot; specialty coatings help protect digital equipment and more<\/title>\n<meta name=\"description\" content=\"Electrically-conductive specialty coating formulation can help address EMI shielding, thermal conductivity, and electro dissipation. 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In his career, he has formulated architectural, industrial, military and specialty coatings. He has also worked with and formulated adhesives, inks, and construction products and in general is a material science generalist. He has a keen interest in Sustainable and Bio-based paints, inks, adhesives and elastomers. He was a Developmental Scientist in the Advanced Materials group at Luna Labs 2004-2008, formulating military coatings and adhesives. Previously, he was at Dow Chemical (1999-2004) as the applications and development manager in Core R&amp;D in the Coatings &amp; Functional Polymers Group. He also managed the TS&amp;D group for coatings while at Dow Chemical (1995-99) and held positions at Rhodia (Laboratory Manager, Latex &amp; Specialty Polymers (1989-95)) and was the Development Chemist, exterior latex paints at Benjamin Moore &amp; Co. (1979-89). Mr. Hirsch has served in a consultancy capacity as a Director with the ChemQuest group, (chemquest.com) June 2021-March 2025 at OmniTech (omnitechintl.com) (2015-2022) for soy-based adhesives and coatings, Daikin America (daikin-america.com) (2011-2015) fluoropolymers and materials, and also with organizations that provide formal mentoring (TORCH 2018-present), coaching and leadership training, as well as the facilitation of problem-solving teams. He has several granted patents, many patent applications and internal disclosures for trade secrets. Connect with Marc on LinkedIn...\",\"sameAs\":[\"https:\\\/\\\/ulprospector.ul.com\",\"https:\\\/\\\/www.linkedin.com\\\/in\\\/marchirsch\\\/\"],\"url\":\"https:\\\/\\\/ulprospector.ul.com\\\/author\\\/marc-hirsch\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\"Smart\" specialty coatings help protect digital equipment and more","description":"Electrically-conductive specialty coating formulation can help address EMI shielding, thermal conductivity, and electro dissipation. 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In his career, he has formulated architectural, industrial, military and specialty coatings. He has also worked with and formulated adhesives, inks, and construction products and in general is a material science generalist. He has a keen interest in Sustainable and Bio-based paints, inks, adhesives and elastomers. He was a Developmental Scientist in the Advanced Materials group at Luna Labs 2004-2008, formulating military coatings and adhesives. Previously, he was at Dow Chemical (1999-2004) as the applications and development manager in Core R&amp;D in the Coatings &amp; Functional Polymers Group. He also managed the TS&amp;D group for coatings while at Dow Chemical (1995-99) and held positions at Rhodia (Laboratory Manager, Latex &amp; Specialty Polymers (1989-95)) and was the Development Chemist, exterior latex paints at Benjamin Moore &amp; Co. (1979-89). Mr. Hirsch has served in a consultancy capacity as a Director with the ChemQuest group, (chemquest.com) June 2021-March 2025 at OmniTech (omnitechintl.com) (2015-2022) for soy-based adhesives and coatings, Daikin America (daikin-america.com) (2011-2015) fluoropolymers and materials, and also with organizations that provide formal mentoring (TORCH 2018-present), coaching and leadership training, as well as the facilitation of problem-solving teams. He has several granted patents, many patent applications and internal disclosures for trade secrets. Connect with Marc on LinkedIn...","sameAs":["https:\/\/ulprospector.ul.com","https:\/\/www.linkedin.com\/in\/marchirsch\/"],"url":"https:\/\/ulprospector.ul.com\/author\/marc-hirsch\/"}]}},"authors":[{"term_id":1242,"user_id":26,"is_guest":0,"slug":"marc-hirsch","display_name":"Marc Hirsch","avatar_url":"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2022\/10\/IMG_1016-scaled.jpg","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/5583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/comments?post=5583"}],"version-history":[{"count":0,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/5583\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media\/5586"}],"wp:attachment":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media?parent=5583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/categories?post=5583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/tags?post=5583"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/ppma_author?post=5583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}