{"id":196,"date":"2009-06-16T20:17:04","date_gmt":"2009-06-16T20:17:04","guid":{"rendered":"http:\/\/www.esdpros.com\/?p=196"},"modified":"2009-06-16T20:17:04","modified_gmt":"2009-06-16T20:17:04","slug":"how-do-we-test-esd-conductive-or-dissipative-gloves","status":"publish","type":"post","link":"https:\/\/www.gndzero.com\/blog\/how-do-we-test-esd-conductive-or-dissipative-gloves\/","title":{"rendered":"How do we test ESD conductive or dissipative gloves?"},"content":{"rendered":"

Q:<\/strong> How do we test ESD conductive or dissipative gloves?<\/p>\n

A:<\/strong> The glove industry offers gloves for the protection of ESD sensitive items by using materials that will provide specific measurable \u201cintrinsic electrical resistance of gloves and finger cots\u201d as per ANSI\/ESD SP15.1-2005.<\/p>\n

Some materials are being used which reduce the amount of charge generation \u201cand\/or have static dissipative properties to reduce charge accumulation\u201d, such as Nitrile or vinyl.\u00a0 I would image cotton could be effective based on the layer of sweat on our skin.\u00a0 But if you require ESD gloves in the Static Conductive range, those would need to be specifically made for that purpose.\u00a0 I\u2019m currently working on nailing down an exact value of what these gloves should read and how that affects the ESD testing of it and the closest I could find comes from a test fixture from Prostat called the CAF\u00c9, or Constant Area & Force Electrode.\u00a0 They recommend using 1.5 to 10 volts when the measurement of glove in combination with personnel through a wrist strap assembly without the 1 meg \u2126 resistor is less than 1 meg ohm.\u00a0 They use 10 volts between 1.0E6 \u2126 and 1.0E7 \u2126.\u00a0 Then they use\u00a0 100 volts for above that.\u00a0 This is fairly easy to do using a sophisticated megger like the 801 in manual mode, otherwise the mere testing of the glove per 15.1 could be a challenge.<\/p>\n

Here\u2019s what\u00a0confuses about ANSI\/ESD S20.20-2007 and -1999 \u2026<\/p>\n

\u00a0What\u2019s the range of the glove and finger cots?\u00a0 Only in 20.20-2007 Tables 1, 2, and 3 final column does it give us \u201cRequired Limits\u201d to measure up against.\u00a0 So then what?\u00a0 Go to manufacturing specs.\u00a0 Some list a value, some don\u2019t.\u00a0 Be careful how they\u2019re categorized; anti-static (describes that it\u2019s low charging but doesn\u2019t really quantify a resistance range unless you\u2019re talking about packaging), static dissipative (1.0E6 \u2126 to 1.0E9 \u2126 ??), and static conductive (less than 1.0E6 \u2126 but greater than what??\u00a0 1.0E4 \u2126 rings a bell, but I\u2019d hope it\u2019s not less than that.).<\/p>\n

Ok, so for our Static Conductive or black finger cots, they measure between 1.0E6 \u2126 and 1.0E8 \u2126 per ASTM D257 and meet the static decay specs per MIL-STD-81705B from 5000 to less than 100 volts in less than 0.01 seconds.<\/p>\n

So here\u2019s the upshot;\u00a0\u00a0 My improvisation in measuring ESD gloves and finger cots involves using the PFA-861-H Handle (see attached), a DUT (esd glove), and a wrist strap without the 1 meg ohm resistor for measurements known to be below about 1.0E7 \u2126\u00a0 , I hook that up to my meg ohmmeter and see what I get (see attached photos).<\/p>\n

\"wand\"\u00a0\"wand-and-sd-glove\"\u00a0\"wand-and-sc-glove\"<\/p>\n

\u00a0<\/p>\n

This ESD TR20.20-Handbook has a wealth, a plethora of information about ESD gloves and finger cots, such as referring to yet other standards such as ANSI\/ESD STM11.11 Surface Resistance Measurement of Static Dissipative Planar Material , and let\u2019s not forget ANSI\/ESD STM11.12 Volume Resistance Measurement of Static Dissipative Planar Materials, oh, and of course ANSI\/ESD STM11.13 Two-Point Resistance Measurement of Static Dissipative and Insulative (what the??) Material, then it goes on to tell us to use the CAF\u00c9 method, which is specifically designed for resistance measurements at the thumb and fingertips, which can yield much lower results than those obtained by the above test BECAUSE THEY INVOLVE A REAL LIVE PERSON, THE WAY THEY ARE ACTUALLY USED IN PRACTICE!\u00a0 Oh, and they say you can only measure once due to a \u201cperson\u2019s skin emissions\u201d.\u00a0 Fair enough.\u00a0 Time to reorder<\/a>?<\/p>\n

So\u2026\u00a0 If\u00a0this info\u00a0helps anybody, let me know and send over a comment.<\/p>\n","protected":false},"excerpt":{"rendered":"

Q: How do we test ESD conductive or dissipative gloves? A: The glove industry offers gloves for the protection of ESD sensitive items by using materials that will provide specific measurable \u201cintrinsic electrical resistance of gloves and finger cots\u201d as per ANSI\/ESD SP15.1-2005. Some materials are being used which reduce the amount of charge generation […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30,4,8,13,14,20],"tags":[78],"class_list":["post-196","post","type-post","status-publish","format-standard","hentry","category-apparel","category-cleanroom","category-esd-protection","category-garments-esd-protection","category-gloves","category-shielding","tag-esd-gloves-static-dissipative-gloves-static-conductive-gloves-test"],"_links":{"self":[{"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/posts\/196","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/comments?post=196"}],"version-history":[{"count":0,"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/posts\/196\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/media?parent=196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/categories?post=196"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gndzero.com\/blog\/wp-json\/wp\/v2\/tags?post=196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}