{"id":4285,"date":"2026-06-25T07:48:39","date_gmt":"2026-06-25T07:48:39","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=4285"},"modified":"2026-06-25T07:48:39","modified_gmt":"2026-06-25T07:48:39","slug":"esd-protective-bags-for-safe-shipping-shielding-vs-dissipative-selection-guide","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/esd-protective-bags-for-safe-shipping-shielding-vs-dissipative-selection-guide\/","title":{"rendered":"ESD Protective Bags for Safe Shipping: Shielding vs. Dissipative Selection Guide"},"content":{"rendered":"<p><span data-font-family=\"Arial\">Selecting the wrong ESD packaging for shipping sensitive components introduces failure modes invisible until field returns arrive. This guide explains how to choose between metallic shielding bags and dissipative poly bags based on threat environment, device sensitivity class, and compliance requirements.<\/span><\/p>\n<table style=\"height: 368px;\" width=\"866\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"624\">\n<h2><b><span data-font-family=\"Arial\">Key Takeaways<\/span><\/b><\/h2>\n<ul>\n<li><span data-font-family=\"Arial\">The 10\u2076 \u03a9 boundary: metallic shielding bags (&lt;10\u00b3 \u03a9\/sq) block external fields; dissipative bags (10\u2076\u201310\u00b9\u00b2 \u03a9\/sq) bleed charge slowly. The resistance decade you select determines whether you contain a threat or channel it away from the device.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Shielding for transit: metalized shielding bags attenuate electrostatic fields by at least 35 dB at 1 MHz per ANSI\/ESD S11.4. This makes them the correct choice for ungrounded shipping environments.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Charge decay matters: a dissipative bag with 10\u2079 \u03a9\/sq surface resistance discharges a 1,000 V event below 100 V in under one second. A standard poly bag, by contrast, sustains &gt;5,000 V indefinitely.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Compliance is non-negotiable: JEDEC JESD625 and IEC 61340-5-1 mandate ESD protective packaging for all Class 1C ESDS devices (HBM &lt;100 V). Mismatched packaging voids most semiconductor supplier warranties.<\/span><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\">What Is an <a href=\"https:\/\/blogs.lcsc.com\/blog\/esd-protection-for-usb-ports-a-complete-engineering-guide\/\">ESD Protective Bag<\/a>?<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">An ESD protective bag is a packaging enclosure engineered to either block external electrostatic fields from reaching enclosed devices (shielding) or prevent charge accumulation on its surface through controlled charge dissipation (dissipative).<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Internal Construction and Materials<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Shielding bags use a multi-layer laminate: outer polyester film, an aluminium metalised layer with sheet resistance below 10\u00b3 \u03a9\/sq, a middle insulating layer, and an inner polyethylene layer forming a Faraday cage analogue. Dissipative bags use carbon-loaded polyethylene or nylon with surface resistivity tuned to 10\u2076\u201310\u00b9\u00b2 \u03a9\/sq, slowing charge flow through distributed resistance rather than reflecting it.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Why ESD Bags Are Indispensable for Engineers<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">An unprotected CMOS device in a standard poly bag can sustain surface potentials above 5,000 V from triboelectric contact. A metallic shielding bag reduces electrostatic exposure to levels compliant with ESD Sensitivity Class 1 (ESDS \u22641,000 V HBM) throughout the full logistics chain.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What Are the Key Features and Advantages of ESD Bags?<\/span><\/b><\/h2>\n<table style=\"height: 373px;\" width=\"804\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><b><span data-font-family=\"Arial\">Feature<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"266.6666666666667\"><b><span data-font-family=\"Arial\">Description<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"210.66666666666666\"><b><span data-font-family=\"Arial\">Engineering Benefit<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><b><span data-font-family=\"Arial\">Field shielding (metallic)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"266.6666666666667\"><span data-font-family=\"Arial\">Metalised layer achieves &gt;35 dB attenuation at 1 MHz per ANSI\/ESD S11.4; sheet resistance &lt;10\u00b3 \u03a9\/sq<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"210.66666666666666\"><span data-font-family=\"Arial\">Protects Class 0 and Class 1 ESDS devices in ungrounded transit without requiring a wrist strap or ESD mat at the receiving dock<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><b><span data-font-family=\"Arial\">Controlled dissipation<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"266.6666666666667\"><span data-font-family=\"Arial\">Surface resistivity 10\u2076\u201310\u00b9\u00b2 \u03a9\/sq per IEC 61340; decay from 1,000 V to &lt;100 V in &lt;1 s<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"210.66666666666666\"><span data-font-family=\"Arial\">Prevents sudden discharge through the device when opened at a grounded ESD workstation<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><b><span data-font-family=\"Arial\">Moisture barrier (MBB)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"266.6666666666667\"><span data-font-family=\"Arial\">WVTR &lt;0.001 g\/m\u00b2\/day at 38\u00b0C\/90% RH in foil-reinforced variants per J-STD-033C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"210.66666666666666\"><span data-font-family=\"Arial\">Enables combined MSL and ESD protection for ICs requiring dry-pack storage before reflow<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">How Metallisation Thickness Drives Shielding Effectiveness<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">At 1 MHz, the aluminium skin depth is approximately 84 \u00b5m. A 10 \u00b5m metalised layer achieves roughly 1.5 skin depths, yielding ~13 dB per layer. A standard 4-ply laminate with two metalised plies exceeds 26 dB \u2014 above the 20 dB Class B floor in ANSI\/ESD S11.4.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What Are the Critical Technical Specifications to Verify?<\/span><\/b><\/h2>\n<table style=\"height: 297px;\" width=\"836\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.66666666666667\"><b><span data-font-family=\"Arial\">Shielding Bag<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><b><span data-font-family=\"Arial\">Dissipative Bag<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66.66666666666667\"><b><span data-font-family=\"Arial\">Unit<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170.66666666666666\"><b><span data-font-family=\"Arial\">Compliance<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Surface resistivity (outer)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.66666666666667\"><span data-font-family=\"Arial\">&lt;10\u00b3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">10\u2076\u201310\u00b9\u00b2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66.66666666666667\"><span data-font-family=\"Arial\">\u03a9\/sq<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170.66666666666666\"><span data-font-family=\"Arial\">IEC 61340-2-3; ASTM D257<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Electrostatic shielding<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.66666666666667\"><span data-font-family=\"Arial\">&gt;35<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">N\/A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66.66666666666667\"><span data-font-family=\"Arial\">dB at 1 MHz<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170.66666666666666\"><span data-font-family=\"Arial\">ANSI\/ESD S11.4<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Charge decay to 10% of 1 kV<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.66666666666667\"><span data-font-family=\"Arial\">&lt;0.5<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">&lt;2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66.66666666666667\"><span data-font-family=\"Arial\">seconds<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170.66666666666666\"><span data-font-family=\"Arial\">ANSI\/ESD S11.31<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">Triboelectric potential<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.66666666666667\"><span data-font-family=\"Arial\">&lt;10<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">&lt;50<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66.66666666666667\"><span data-font-family=\"Arial\">V on surface<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170.66666666666666\"><span data-font-family=\"Arial\">IEC 61340-5-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">WVTR (MBB variant)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.66666666666667\"><span data-font-family=\"Arial\">&lt;0.001<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Not rated<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66.66666666666667\"><span data-font-family=\"Arial\">g\/m\u00b2\/day<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170.66666666666666\"><span data-font-family=\"Arial\">J-STD-033C, IPC-1601<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"160\"><span data-font-family=\"Arial\">RoHS \/ REACH<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.66666666666667\"><span data-font-family=\"Arial\">RoHS 3 (EU 2015\/863)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">RoHS 3 (EU 2015\/863)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"66.66666666666667\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"170.66666666666666\"><span data-font-family=\"Arial\">EU Directive 2011\/65<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">How Do These Specifications Affect Real-World Performance?<\/span><\/b><\/h3>\n<p><b><span data-font-family=\"Arial\">Resistivity floor: <\/span><\/b><span data-font-family=\"Arial\">Surface resistivity below 10\u2075 \u03a9\/sq reclassifies a bag as conductive, creating a low-impedance path to ground. This risks a CDM event when device pins contact the interior at a grounded station.<\/span><\/p>\n<p><b><span data-font-family=\"Arial\">Humidity derating: <\/span><\/b><span data-font-family=\"Arial\">Carbon-loaded dissipative films rise approximately one resistance decade per 20% RH drop below 50% RH (IEC 61340-4-1). A bag at 10\u2079 \u03a9\/sq at 50% RH may reach 10\u00b9\u00b9 \u03a9\/sq at 10% RH, approaching the insulative boundary.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What Customisation and Configuration Options Are Available?<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Package Form Factors<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Open-top heat-seal bags suit automated sealing lines with nitrogen purge for J-STD-033C dry-pack compliance. Ziplock reclosable bags serve service kits requiring repeated access. Gusseted stand-up bags accommodate populated PCBs with component height above 20 mm without stressing sealed seams.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Material Variants and Shielding Architecture<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">Metallic 4-ply (PET \/ Al \/ PE \/ PE): <\/span><\/b><span data-font-family=\"Arial\">Standard Class B shielding. A 6-ply variant adds a second metalised layer for &gt;50 dB, specified for Class 0 ESDS or MIL-PRF-81705E Type I applications.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Pink polyethylene dissipative: <\/span><\/b><span data-font-family=\"Arial\">Resistivity 10\u2079\u201310\u00b9\u00b9 \u03a9\/sq; suited as innermost wrap inside a metallic outer. Not a standalone shipping solution for Class 1 devices.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Black conductive foam-lined: <\/span><\/b><span data-font-family=\"Arial\">Used inside shielding bags for IC tubes and trays; foam-to-lead contact equalises pin potentials and eliminates triboelectric differentials.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Anti-static carrier tape (IEC 60286-3): <\/span><\/b><span data-font-family=\"Arial\">Encloses SMD reels inside a shielding outer for kitting; specify both tape static decay and bag shielding rating.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">How Are ESD Bags Used in Real-World Application Scenarios?<\/span><\/b><\/h2>\n<ul>\n<li><b><span data-font-family=\"Arial\">Bare-die shipping: <\/span><\/b><span data-font-family=\"Arial\">Class 1C CMOS dice (HBM 100\u2013250 V) ship in 4-ply metallic bags with nitrogen purge. The metalised layer blocks induction from handling machinery while nitrogen suppresses bond-pad oxidation.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\"><a href=\"https:\/\/www.lcsc.com\/pcba\">PCB<\/a> assembly kitting: <\/span><\/b><span data-font-family=\"Arial\">Populated boards with BGA and fine-pitch QFN packages use ziplock metallic bags for inter-facility transfer, allowing part-number inspection without cutting the bag.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Military avionics storage: <\/span><\/b><span data-font-family=\"Arial\">GaAs MMIC radar front-ends rated below 50 V HBM require MIL-PRF-81705E Type I bags with &gt;40 dB shielding and WVTR &lt;0.002 g\/m\u00b2\/day for Class 3 long-term storage.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">E-commerce IC fulfilment: <\/span><\/b><span data-font-family=\"Arial\">Distribution EPAs use reclosable dissipative bags (10\u2079 \u03a9\/sq) for bench kitting. The bag prevents charge buildup from pneumatic pick tubes and reseals rapidly between picks.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">How Do Shielding Bags and Dissipative Bags Compare?<\/span><\/b><\/h2>\n<table style=\"height: 388px;\" width=\"966\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133.33333333333334\"><b><span data-font-family=\"Arial\">Attribute<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><b><span data-font-family=\"Arial\">Metallic Shielding Bag<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><b><span data-font-family=\"Arial\">Dissipative Bag<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><b><span data-font-family=\"Arial\">Key Differentiator<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133.33333333333334\"><span data-font-family=\"Arial\">Field attenuation<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">&gt;35 dB at 1 MHz (ANSI\/ESD S11.4)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">None; no metalised layer<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Only shielding bags protect against external induction in ungrounded environments<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133.33333333333334\"><span data-font-family=\"Arial\">Surface resistivity<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">&lt;10\u00b3 \u03a9\/sq<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">10\u2076\u201310\u00b9\u00b2 \u03a9\/sq<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Resistivity decade determines whether bag contains or channels charge<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133.33333333333334\"><span data-font-family=\"Arial\">Moisture barrier<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">Available (4- or 6-ply foil)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">Not available<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">MBB required for MSL devices under J-STD-033C<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"133.33333333333334\"><span data-font-family=\"Arial\">Primary use<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">Shipping, transit, long-term storage<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">EPA bench handling, inner wrap<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"144\"><span data-font-family=\"Arial\">Dissipative bags need a shielding outer for any transit scenario<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">Quick Selection Guide<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">Device HBM \u22641,000 V (Class 1)? <\/span><\/b><span data-font-family=\"Arial\">\u2192 Metallic shielding bag mandatory for all transit and storage.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Handling within a grounded EPA only? <\/span><\/b><span data-font-family=\"Arial\">\u2192 Dissipative bag sufficient; verify resistivity &lt;10\u00b9\u00b2 \u03a9\/sq at lowest expected humidity.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">MSL 2 or higher? <\/span><\/b><span data-font-family=\"Arial\">\u2192 Metallic MBB bag per J-STD-033C with desiccant and humidity indicator card.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Military or aerospace? <\/span><\/b><span data-font-family=\"Arial\">\u2192 MIL-PRF-81705E Type I; commercial bags may not meet &gt;40 dB or WVTR limits.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">SMD reel kitting in EPA? <\/span><\/b><span data-font-family=\"Arial\">\u2192 IEC 60286-3 carrier tape inside a shielding bag outer; dissipative alone is insufficient for ungrounded transport.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Conclusion: Choosing the Right ESD Bag for Your Shipping Application<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">The core trade-off is precise: dissipative bags control charge on the bag surface; metallic shielding bags protect the device from charge on everything outside it. For any component leaving a controlled EPA, a metallic bag with verified ANSI\/ESD S11.4 compliance is the correct specification.<\/span><\/p>\n<p><span data-font-family=\"Arial\">When in doubt, the deciding factor is the threat environment. If the device contacts ungrounded handlers or surfaces at any point, dissipative alone fails. A bag providing &gt;35 dB shielding at 1 MHz reduces induced voltage on the enclosed device by a factor of 56 relative to a standard poly bag: that ratio is the engineering argument in a single number.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Frequently Asked Questions<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Q: Can a dissipative bag alone ship a Class 1B device (HBM 200\u2013500 V)?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">No. IEC 61340-5-1 and JEDEC JESD625B require both surface charge control and electrostatic field shielding for Class 1 ESDS devices outside an EPA. A dissipative bag provides zero field attenuation. A metallic shielding bag meeting ANSI\/ESD S11.4 is required. The dissipative bag may serve as an inner wrap inside the metallic outer.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: How does low humidity affect dissipative bag performance?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Carbon-loaded films rise approximately one resistance decade per 20% RH drop below 50% RH per IEC 61340-4-1. A bag at 10\u2079 \u03a9\/sq at 50% RH may reach 10\u00b9\u00b9 \u03a9\/sq at 10% RH. Specify bags with mid-range resistivity (10\u2078\u201310\u00b9\u00b0 \u03a9\/sq) for low-humidity facilities to maintain compliance under worst-case conditions.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: How do I verify incoming ESD bags without lab equipment?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Use a calibrated surface resistance meter per ANSI\/ESD STM11.11 (two 2.5 kg cylindrical electrodes, 10 V applied) for surface resistivity. For shielding bags, the spark-gap tester in ANSI\/ESD S11.4 Annex A confirms field attenuation: a compliant bag prevents a neon indicator from illuminating at 1,000 V. Condition samples at 23 \u00b1 1\u00b0C and 12 \u00b1 3% RH for 24 hours before measurement.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: How many reseals before a ziplock shielding bag loses effectiveness?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">ANSI\/ESD S11.4 sets no reseal cycle limit. However, supplier data from Desco and Protektive Pak shows shielding effectiveness drops 3\u20135 dB after 10 open-close cycles due to metalised layer delamination at the closure fold. Limit reuse to five cycles for Class 1 applications, or specify reinforced metalised fold zone bags and replace per your site ESD control plan.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: <\/span><\/b><b><span data-font-family=\"Arial\">Is a pink anti-static bag compliant with IEC 61340-5-1 for shipping?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Only within a defined EPA. IEC 61340-5-1 Clause 5.3.4 requires electrostatic shielding capability for packaging used outside an EPA. Pink dissipative bags provide no field attenuation. Shipping Class 1 devices in them alone is a documented audit non-conformance and typically voids the component supplier\u2019s warranty.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Selecting the wrong ESD packaging for shipping sensitive components introduces failure modes invisible until field returns arrive. This guide explains how to choose between metallic shielding bags and dissipative poly bags based on threat environment, device sensitivity class, and compliance requirements. Key Takeaways The 10\u2076 \u03a9 boundary: metallic shielding bags (&lt;10\u00b3 \u03a9\/sq) block external fields; [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"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,"footnotes":""},"categories":[27],"tags":[32,395,396],"class_list":["post-4285","post","type-post","status-publish","format-standard","hentry","category-electronic-components","tag-esd","tag-esd-protective-bags","tag-shipping"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ESD Bags Explained: Shielding vs. Dissipative Shipping - LCSC<\/title>\n<meta name=\"description\" content=\"Compare ESD shielding vs. dissipative bags. Choose the best protective packaging for shipping electronics based on resistance levels.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.lcsc.com\/blog\/esd-protective-bags-for-safe-shipping-shielding-vs-dissipative-selection-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ESD Bags Explained: Shielding vs. Dissipative Shipping - LCSC\" \/>\n<meta property=\"og:description\" content=\"Compare ESD shielding vs. dissipative bags. 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