Electronic Component Tray Cases: Sorting & ESD Protection

An electronic component handling case has to solve four problems at once: sorting thousands of parts by part number, blocking electrostatic discharge from destroying devices, slowing moisture uptake in moisture-sensitive components, and preventing reels and stick tubes from deforming or cracking in transit. The conclusion first: a competent component case is not a black plastic crate. It is a graded control system built from static-dissipative materials, adjustable dividers or molded cavities, a moisture barrier and a labeling system. Its design and acceptance should cover the packaging material requirements of ANSI/ESD S20.20 and ANSI/ESD S541, the general ESD framework of IEC 61340-5-1, the moisture-sensitive device handling requirements of IPC/JEDEC J-STD-033, and the sealing grades of IEC 60529 / GB/T 4208 together with the GB/T 4857 transport test methods.

Components rarely fail because they were used up. They fail because they were handled badly or stored badly. A single 01005 resistor costs almost nothing, yet its failure can scrap an entire control board. When a QFN device absorbs moisture and suffers internal cracking during reflow, the loss is measured in line takt time and customer delivery commitments.

Yet the real-world handling chain is casual. Reels sit in original plastic bags at the bottom of a shelf. Stick tubes are bundled with rubber bands and dropped into a carton. Loose parts are divided into ordinary plastic bags. In that state, neither ESD risk nor moisture risk can be measured, let alone managed.

This article is written for SMT materials engineers, ESD control owners, warehouse and logistics supervisors, and purchasing staff. It covers sorting logic, material selection, humidity management, structural design and acceptance methodology, so that ESD and moisture protection becomes a measurable and traceable hardware specification rather than a slogan.

Contents

• 1. The Four Core Tasks of a Component Handling Case
• 2. Sort Before You Select: Reels, JEDEC Trays, Stick Tubes and Bulk Parts
• 3. The ESD Protection System: Standards Framework and Resistance Bands
• 4. Grounding and Equipotential Bonding: Connecting the Case to the ESD Zone
• 5. Moisture-Sensitive Devices and J-STD-033: Drying, Baking and Floor Life
• 6. Mechanical Protection: Reel Deformation, Tube Cracking and Tray Misalignment
• 7. Inserts and Dividers: Adjustable Partitioning Versus Molded Cavities
• 8. Case Structure and Stacking: Workshop, Inter-Plant and Export
• 9. Choosing a Sealing Grade: IP54, IP65 or IP67
• 10. Flammability and Cleanliness: UL94 and Cleanroom Classes
• 11. Labeling and Traceability: Barcodes, QR Codes and Poka-Yoke
• 12. Standards Reference and Transport Validation
• 13. Cleaning, Maintenance and Service Life Management
• 14. Common Misconceptions and Engineering Recommendations
• Frequently Asked Questions
• Conclusion and Related Reading

1. The Four Core Tasks of a Component Handling Case

Task one: sorting and preventing mix-ups. A single SMT line can have several hundred part numbers live at once, and many of them look nearly identical: same 0402 package, same black body, no markings. Once a mix-up reaches the placement stage, the result is board rework or scrap. Sorting is not cosmetic tidying. It is the first physical barrier against error.

Task two: preventing electrostatic discharge. MOS structures, thin-film resistors, thin-film capacitors, laser diodes and some sensors are static-sensitive. ESD damage divides into hard failures and latent failures. Latent failures do not appear in outgoing inspection but surface later as early-life failures at the customer.

Task three: moisture control and MSL management. Plastic packages including QFP, BGA and QFN absorb moisture during storage. During reflow, that moisture flashes to steam and creates internal vapour pressure, causing delamination, cracking (commonly called popcorning) and bond wire damage. The key to moisture sensitivity level management is controlling exposure duration, and that clock starts the moment the dry pack is opened.

Task four: preventing mechanical damage. Reels deform under stacking pressure, which disturbs tape tension and causes feeder jams. Stick tubes crack or bend under compression. JEDEC trays misalign when stacked and crush leads. All three failure modes originate in the packaging structure rather than in the devices themselves.

2. Sort Before You Select: Reels, JEDEC Trays, Stick Tubes and Bulk Parts

Different package formats need fundamentally different protection logic. Complete the bill of materials review before choosing a case.

SMD reels. Common diameters are 7 inch, 13 inch and 15 inch, with tape widths from 8 mm to 88 mm. Three risks dominate. First, side compression deforms the reel flange, which warps the tape edge and causes feeder jams. Second, axial compression squeezes the tape layers and damages component terminations. Third, static. The protection rule for reels is vertical storage, no axial load bearing and limited lateral travel, not flat stacking.

JEDEC matrix trays. Precision devices such as BGA, QFN, LGA and CSP commonly ship in standard matrix trays. Trays designed to JEDEC specifications have fixed outlines and stacking features, locating against each other through bosses and recesses. The transport case must keep tray stacks level, aligned and free of lateral shear. The tray itself has limited strength, and once a stack tilts, the devices on the top tray carry the entire lateral load.

Stick tubes. Used for SOP, SOIC and TSSOP packages with exposed leads. A stick tube is a long, thin-walled structure that is most vulnerable to bending and end compression. It should be transported horizontally with multi-point support so both ends are not left unsupported.

Bulk and bagged parts. Samples and repair spares often move in bulk. These should go into ESD shielding bags and then into a case with individual cavities. Do not simply pour them into a case, because mutual collision is itself a mechanical damage source and counting becomes impossible.

3. The ESD Protection System: Standards Framework and Resistance Bands

Standards framework. ANSI/ESD S20.20 specifies requirements for an electrostatic discharge control program, covering organization, personnel training, work areas, packaging and marking. IEC 61340-5-1 provides the international general framework for protecting ESD-sensitive devices. For packaging materials specifically, ANSI/ESD S541 is the most direct basis for selection and acceptance. Domestic programs often reference the GB/T 32304 family of electrostatic protection standards.

The difference between four material categories.

• Insulating materials: extremely high surface resistance, so charge cannot drain, and triboelectric charging is pronounced. Ordinary plastic crates fall into this category and are the most dangerous choice for component handling.
• Static-dissipative materials: resistance sits in the middle band, allowing charge to drain at a controlled rate. This is the most common category for inserts, dividers and case interior surfaces. A frequently cited working band is roughly 10 to the fifth through 10 to the eleventh ohm, though the exact band and test method should be fixed in the technical agreement.
• Conductive materials: very low resistance and the fastest drainage, but they can produce rapid discharge and may scratch devices. Commonly used for shielding bags, conductive foam and some stick tubes.
• Shielding materials: include a conductive layer that blocks external fields, used mainly for outer bags and transport of highly sensitive devices.

Why the measurement method matters. Surface resistance values depend heavily on the test method and electrode geometry. ANSI/ESD STM11.11 and STM11.12 define methods for surface resistance and volume resistance respectively. A resistance figure without an agreed test method cannot be compared, and this is the single most overlooked point between suppliers and buyers.

For detailed design of electrostatic shielding structures, see ESD shield case design.

4. Grounding and Equipotential Bonding: Connecting the Case to the ESD Zone

Dissipative material is necessary but not sufficient. Charge also needs a path to ground.

Three practical paths.

Path one: equipotential bonding with the work surface. In an ESD protected area, the case sits on a static-dissipative bench surface that is bonded to ground. If the case body is pure plastic, it must be electrically connected to that surface through metal components such as hinges, latches or handle shafts.

Path two: personnel grounding. Operators wear wrist straps or conductive footwear and garments so that the human body does not become a charge source. A wrist strap is the highest-value ESD investment and also the most frequently skipped control.

Path three: reducing charge generation. Reduce friction, avoid rapid separation (peeling ordinary adhesive tape or ordinary plastic film is a classic high-charge action), and avoid highly insulating padding and packaging materials.

Three structural details.

• For one-piece plastic cases, consider a conductive coating or conductive insert on the interior wall, bonded to an external metal component.
• Dividers and inserts should be static dissipative. Avoid the combination of a dissipative case with insulating dividers, because the dividers are what actually touch the devices.
• Contact between dissimilar materials generates triboelectric charge, so the material system inside the case should be as consistent as possible and extreme mismatches within one cavity should be avoided.

For a cross-comparison of insert materials and selection logic, see case foam material comparison and custom foam insert design guide.

5. Moisture-Sensitive Devices and J-STD-033: Drying, Baking and Floor Life

What moisture sensitivity level means. IPC/JEDEC J-STD-033 specifies handling, packing, shipping and use requirements for moisture-sensitive surface mount devices. The MSL rating reflects how long a device can tolerate exposure under defined conditions, and higher levels allow shorter exposure. The central concept is floor life: the permitted time between opening the dry pack and completing reflow.

The role of a transport case in humidity management. Components normally leave the factory already dry packed with a desiccant and a humidity indicator card. The handling case has two jobs. First, during post-opening workshop circulation, it should slow moisture uptake as much as possible. Second, when baking is required to reset floor life, it should provide a load-bearing structure compatible with baking conditions.

Engineering constraints on baking. Baking is typically performed at 125 degrees Celsius for an extended period, or in a low-humidity environment at 40 to 90 degrees Celsius. The load-bearing structure must survive the baking temperature. Ordinary PE and EVA inserts soften and deform at high temperature, and some materials are unsuitable at 125 degrees Celsius. If the case must enter a baking process, specify heat-resistant materials such as certain engineering plastics, metal trays or dedicated high-temperature racks. For temperature zone considerations, see extreme temperature case design.

Moisture barrier and desiccant sizing points.

• Size the desiccant from internal free volume, target humidity, expected duration and packaging moisture vapour transmission rate.
• Use a humidity indicator card so moisture ingress can be judged on opening.
• The more often a sealed case is opened, the faster internal humidity recovers. Record opening frequency where practical and replace desiccant once the limit is exceeded.

For the relationship between pressure equalization and sealing, see case pressure equalization valve.

6. Mechanical Protection: Reel Deformation, Tube Cracking and Tray Misalignment

Reel deformation. Reels are mostly injection-moulded plastic, and their flanges bulge outward or dent inward under lateral pressure. A deformed reel loads the tape edge unevenly, producing jams and feed deviation in the feeder. The protection rule is to avoid flat stacking and side compression.

Stick tube cracking. The ends of a stick tube are stress concentration points that crack under compression or impact, while a long tube left unsupported in the middle sags under its own weight over time. The protection rule is horizontal placement, multi-point support and buffered clearance at the ends.

Tray misalignment and lead crushing. JEDEC trays rely on their stacking features to hold relative position. If the case allows movement and the stack misaligns, the underside of an upper tray contacts the devices below and crushes leads and solder balls directly. The protection rule is perimeter retention, light top pressure and a limited number of layers.

7. Inserts and Dividers: Adjustable Partitioning Versus Molded Cavities

Trade-offs between two basic approaches.

Approach one: molded cavity inserts. Molded EVA or PE cavities sized to reel diameter or tray dimensions deliver high locating accuracy and strong error prevention, and suit stable part numbers with high volumes. The drawback is high changeover cost.

Approach two: adjustable divider systems. Rails inside the case allow dividers to slide and lock at the required position, accommodating different reel widths and tray quantities. Flexibility is high, but divider position stability after transport needs attention.

The recommended combination strategy. Use molded cavities for high-runner parts, adjustable dividers for variable parts, and set a physical zone boundary between the two so they cannot mix. For implementation approaches to adjustable partitioning, see removable divider system design.

Surface treatment and cleanliness requirements. Insert materials should not shed. Machining debris from forming must be removed. If the surface powders after long use, replace it rather than continuing to use it. In component handling, insert cleanliness directly affects the solderability of device terminations and pads.

8. Case Structure and Stacking: Workshop, Inter-Plant and Export

The key stacking constraint. Stacking load travels through the case walls into the insert and then into the components. If the insert provides insufficient vertical support, the load is carried directly by the reels or trays. Stacking capability must therefore be designed for both case strength and insert load path. For reels, vertical load should be carried mainly by the vertical dividers of the insert rather than by the reel flange.

On long-distance transport. Export scenarios must handle temperature and humidity cycling plus salt spray, so sealing grade, desiccant quantity and rust prevention all need re-evaluation. See transport packaging test procedures and ISTA.

9. Choosing a Sealing Grade: IP54, IP65 or IP67

IEC 60529, and the equivalent GB/T 4208, uses two digits to define enclosure protection. The first digit covers solid ingress including dust, and the second covers water.

Common misconceptions. First, reading IP67 as absolutely watertight. It actually means no ingress under defined conditions for a defined duration, and aged seals plus more open-close cycles weaken real capability. Second, assuming higher is always better. Higher ratings mean tighter sealing and greater opening resistance, which reduces efficiency for a high-frequency workshop case. Third, judging the case by its rating while ignoring the seals. Protection is limited by the weakest link, and gaskets, hinges, latches and pressure valves are all potential leak paths. For further reading, see waterproof case IP ratings explained and IP67 protective case design and validation.

10. Flammability and Cleanliness: UL94 and Cleanroom Classes

Flammability. Electronics manufacturing and warehousing often require the case material to be rated to UL94. UL94 V-0 means the specimen self-extinguishes within 10 seconds after flame removal in the vertical burning test and does not produce dripping that ignites cotton. Note that specimen thickness and orientation both affect results, so data should always be quoted with its conditions.

Compatibility between antistatic and flame-retardant performance. Antistatic function is normally delivered by conductive fillers or antistatic masterbatch, and flame retardancy by flame retardants. Adding both can cause mutual interference. When a product requires both properties, rely on measured data from the finished part.

Cleanliness. Cases used in high-class cleanrooms must be assessed for particle shedding and volatile outgassing. Cleanrooms are generally classified under the ISO 14644 family. For high-cleanliness applications, cases and inserts should be cleaned and allowed to outgas before being put into service. For material system comparisons, see case foam material comparison.

11. Labeling and Traceability: Barcodes, QR Codes and Poka-Yoke

Hidden losses come from invisibility. The most common loss in component handling is not damage but wrong parts, missing parts and expired material reaching the line.

A three-level labeling system.

• Case level: material category, owning line or customer, last inventory date, responsible role.
• Zone level: part number and quantity limit for each cavity or divider zone, matching its intended content one to one.
• Item level: reels, trays and stick tubes keep their original barcode or QR code. For MSL devices, record the bag-opening date and floor life expiry.

Poka-yoke design. Use differently coloured zone liners for similar part numbers. Use different slot widths for different reel sizes so misloading is physically impossible. Apply a prominent time label to opened MSL devices. Physical error prevention beats procedural error prevention, because procedures get rushed when production pressure rises.

Integration with information systems. A case-level QR code can connect to the warehouse management system for scan-based issue and receipt, automatic consumption posting and batch traceability. Labels are not decoration. They are the interface that connects a physical carrier to a digital management system.

12. Standards Reference and Transport Validation

Framing MIL-STD-810H correctly. It is an environmental test methods standard. In a commercial protective case context, citing it means that corresponding methods were used to run environmental tests, not that a military certification was obtained. See MIL-STD-810H environmental testing and case compliance.

Validation workflow. Step one, define the distribution environment (transport mode, handling cycles, stacking layers, temperature and humidity range). Step two, select the test procedure (GB/T 4857 series, an ISTA procedure, or an ASTM D4169 distribution cycle). Step three, set quantified criteria (no rupture, no seal failure, no insert displacement, and no solderability anomaly on device terminations and pads after removal). Step four, execute and record (drop height and orientation, vibration spectrum and duration, stacking load, internal humidity before and after). See GB/T 4857 transport packaging testing and ASTM D4169 distribution cycle testing.

13. Cleaning, Maintenance and Service Life Management

Cleaning points.

• Use a neutral cleaner and a soft cloth. Avoid solvent cleaners, which can damage the antistatic layer and the flame retardant system.
• Inserts must be fully dry before being put back into service, so moisture is not introduced into a sealed case.
• Avoid linting cloths during cleaning, because fibres remain inside cavities.

Periodic inspection items.

• Gaskets: hardening, cracking, deformation, and debris on sealing faces.
• Latches and hinges: spring fatigue and cracking.
• Inserts: cavity deformation, surface powdering, and antistatic retest results.

Replacement criteria. Obvious cavity deformation, surface powdering, antistatic retest outside specification, or a gasket that has lost elasticity without recovering. For cleaning steps and service life factors, see how to clean a protective case and protective case service life and influencing factors.

A total cost of ownership view. Purchase price is only part of the cost. The real cost items include rework and scrap from mix-ups, reflow defects from moisture uptake, line stops and replacement costs from reel deformation or tube cracking, and labour spent on counting and tracing. Evaluated as avoiding one batch rework event, protection investment usually pays back quickly.

14. Common Misconceptions and Engineering Recommendations

Misconception one: storing components in ordinary plastic crates. Insulating, no zoning, no sealing, and an active static generator. This is the most frequent error.

Misconception two: putting a single label on the outside of the case only. Without zone-level labels inside, staff must rummage bag by bag after opening, and the mix-up risk is unchanged.

Misconception three: a dissipative case with insulating dividers. The dividers are what touch the devices. If they insulate, the whole system fails.

Misconception four: stacking reels flat. Flange compression deforms them and feeding problems follow.

Misconception five: ignoring the MSL floor life clock. The clock starts when the bag is opened. No case can reset floor life; only baking can.

Misconception six: marketing MIL-STD-810H as a military certification. This creates compliance risk.

Engineering recommendation checklist:

1. Complete the bill of materials review first, sorted by format (reel, tray, stick tube, bulk).
2. Use molded cavities for high-runners and adjustable dividers for variable parts, with a physical zone boundary.
3. Use static-dissipative material for both inserts and dividers, and provide a grounding path in the case.
4. Specify the resistance band and the test method in the technical agreement, referencing ANSI/ESD STM11.11 and STM11.12.
5. Record bag-opening dates and floor life for moisture-sensitive devices, and fit desiccant plus a humidity indicator card.
6. Store reels vertically so vertical load is carried by the insert, not the flange.
7. Choose the sealing grade from the actual distribution environment rather than chasing the highest rating.
8. Build a three-level labeling system across case, zone and item, and connect it to the warehouse system.
9. Agree the transport test procedure and quantified acceptance criteria.

On supplier selection. In OEM and ODM cooperation, confirm whether the supplier can support insert drawing review, sample trial fitting, antistatic performance testing and transport test coordination. In the protective case sector, JUNZHJIA provides end-to-end support from case structure design and insert customization through sealing and transport validation. Its manufacturing system under Kexin New Materials (Guangdong) Co., Ltd. can develop molded cavities for reels, JEDEC trays and stick tubes, and configure static-dissipative materials and sealing solutions as required. For selection methodology, see instrument case selection guide and how to choose a case OEM factory.

Frequently Asked Questions

Q: Is a more expensive, higher-rated component case always better? A: No. Requirements are set by the use scenario, and higher ratings are not monotonically better. A case used frequently inside a workshop benefits more from handling efficiency, clear zoning and reliable static control. Chasing IP67 brings side effects: greater opening resistance, a more pronounced internal pressure differential and faster desiccant consumption. Conversely, an export sea freight application with only IP54 will suffer moisture ingress because sealing is insufficient. The correct method is to map the full flow path of the material, identify the static, humidity, mechanical and environmental risk at each step, and then define material, structure and sealing grade. Key parameters should be written into the technical agreement, covering resistance band and test method, sealing grade and test method, and insert locating accuracy and acceptance criteria, rather than judging only on unit purchase price.

Q: Do antistatic materials lose effectiveness over time? A: Yes. Antistatic capability relies mainly on a conductive network formed by conductive fillers or antistatic masterbatch, and its effect decays with humidity variation, cleaning method, UV exposure and mechanical wear. The rate depends heavily on usage intensity, cleaner type and ambient humidity, so no universal fixed interval applies. In practice, specify the initial resistance band and test method in the technical agreement, retest samples at a fixed interval during use, and schedule replacement when results fall outside the agreed band or when the insert surface visibly powders, whitens or loses gloss. Another frequently overlooked point is cleaning method: solvent cleaners can directly destroy the antistatic layer, so a neutral cleaner should be used.

Q: Should reels be stored flat or upright in a handling case? A: Upright is recommended. The reel flange is a thin-walled moulded structure, and when stacked flat the vertical load passes through the flange, which easily bulges outward or dents inward and then warps the tape edge, causing feeder jams. When stored upright, load is carried by the insert dividers and the reel body only sees limited restraint, which greatly reduces risk. Implement this with vertical slots or divider rails inside the case, with slot width adjustable to reel width and slot depth at least the reel radius. Note that upright storage creates a tendency for the case contents to sway during movement, so slot depth, top retention and stack layer limits must be designed together. For 15 inch reels, also calculate the fully loaded case weight and the handling method.

Q: Can floor life for MSL devices be paused while they sit in a handling case? A: No. Floor life counts from the moment the dry pack is opened. A case can only slow the moisture uptake rate; it cannot reset the clock. The only way to reset floor life is to bake per IPC/JEDEC J-STD-033 and repack in a dry pack. The correct role of the case is therefore to lower ambient humidity during post-opening workshop circulation through sealing and desiccant, reducing the actual moisture absorbed by the devices and buying the line more time. A recording mechanism should also be in place, marking bag-opening date and floor life expiry so that overdue devices do not reach reflow. If the case must enter a baking process, the insert and case materials must withstand the baking temperature.

Q: Can different component formats share one handling case? A: Yes, but they must be physically zoned. Reels, trays and stick tubes differ entirely in mass, outline and sensitive direction. Reels deform under side load and need upright storage; trays tilt and need a horizontal support platform; stick tubes bend and need multi-point support. If all three share one cavity, acceleration and deceleration during transport will make heavier or stiffer items strike the others. The sensible approach is to divide one case into separate zones with a solid insert wall, each zone clearly labeled, or to use separate cases managed through a unified coding and manifest system. Under no circumstances should loose devices simply be poured into a shared cavity.

Q: How much desiccant should be used, and is there a simple reliable rule? A: There is no universal answer such as two packets per case. The correct quantity depends on internal free volume, target relative humidity, expected transport or storage duration, packaging moisture vapour transmission rate and initial humidity. In practice, first fix the target humidity and maximum exposure duration, then calculate the required mass from the desiccant absorption capacity and keep a safety margin. A humidity indicator card is mandatory so that moisture can be judged visually on opening. For devices with high moisture sensitivity, consider a humidity recording label or data logger inside the case to produce traceable data. Also record opening frequency, because every opening raises internal humidity, and frequently opened cases need shorter desiccant replacement intervals.

Q: How should the sealing grade of a handling case be determined? A: From the harshest step in the distribution environment, not from an average. Map the transport modes (indoor handling, road, sea, air, parcel), the number of handling cycles and whether forklifts are used, whether standing water or rain may be encountered, whether the warehouse is air-conditioned with dehumidification, and whether temperature and humidity cycling occurs. If everything happens inside a temperature-controlled clean workshop, IP54 is sufficient. If there is inter-plant road transport with handling outside a rain canopy, IP65 is advisable. If sea freight and rainy-season intermodal transport are involved, IP67 with a pressure equalization valve is advisable. Note that a higher sealing grade makes the pressure differential issue more pronounced, so pressure relief design must not be omitted.

Q: How can you verify whether a protective case supplier genuinely understands ESD requirements? A: Start with four questions. First, can they provide surface resistance data for inserts and dividers and state the measurement method used, for example ANSI/ESD STM11.11 or STM11.12. Second, can they explain the case grounding path, meaning which structural components carry charge from the insert to ground. Third, can they provide material flammability ratings together with test thickness and orientation. Fourth, can they support sample trial fitting and transport testing and issue quantified acceptance records. If a supplier can only answer that they use antistatic material, it usually means they lack a traceable data system. Write these requirements into the technical agreement as explicit deliverables.

Q: How should the return on investment for this protection system be calculated? A: Use an avoided-loss approach. The main cost items are rework and scrap from mix-ups, reflow defects and rework labour from moisture uptake, line stops and replacement costs from reel deformation or tube cracking, labour spent on counting and tracing, and reputational loss from customer complaints. Compare these against the purchase and maintenance cost of cases and inserts. In most electronics manufacturers, avoiding one batch rework event or one feeding-related line stop recovers the investment. Beyond direct cost, consider management benefits: zoning and labeling raise inventory efficiency, batch traceability improves, and providing compliance evidence during customer audits becomes much easier.

Conclusion and Related Reading

The essence of an electronic component handling case is translating four requirements, sorting, static control, moisture control and mechanical protection, into measurable hardware specifications. Its value lies not in the box itself but in keeping every device in a controlled state from bag opening through circulation, staging and line feeding. The path can be summarized in four steps: first map component formats and the distribution environment, then design inserts and zoning by format, then set static and sealing grades from actual risk, and finally complete acceptance through agreed measurement methods and quantified criteria.

On the supply side, a manufacturer able to support insert drawing review, sample trial fitting, antistatic performance testing and transport test coordination substantially reduces project iterations. In protective case customization, JUNZHJIA supports developing molded cavities for reels, JEDEC trays and stick tubes, configuring static-dissipative materials and sealing solutions, and cooperating on trial fitting and acceptance records, making it suitable for electronics manufacturers that need stable long-term supply and OEM/ODM cooperation.

Related Reading

• ESD shield case design
• Custom foam insert design guide
• Case foam material comparison