Author: MP

Antistatic bags and static shielding bags are often confused, but they are not the same tool. Choosing the correct bag matters when components or PCB assemblies move outside the protected workbench area.

What antistatic bags are for

Antistatic bags are designed to reduce static generation during handling. They are useful for items that need protection from tribocharging, which is charge created by contact and separation. They are commonly used for parts, small assemblies, and internal movement where the environment is already controlled.

What static shielding bags add

Static shielding bags provide a barrier against external electrostatic fields. This is important when products are shipped, stored, or handled outside an ESD protected area. A shielding bag is usually the better choice for sensitive PCB assemblies, integrated circuits, memory modules, and customer dispatch.

Simple selection guide

• Use antistatic bags for controlled internal handling where charge generation is the main concern.
• Use static shielding bags when assemblies leave the EPA or may be handled by unknown users.
• Use cushioning such as ESD-safe bubble bags when shock and abrasion are also concerns.
• Never put a sensitive assembly inside ordinary plastic packaging.

Marvel Products lists these options in the Antistatic Packaging category. If a connector, pin header, or port requires individual protection, also review Conductive Dust Caps.

The lowest-cost bag can become expensive if it allows latent ESD damage. Match the packaging to the journey of the product, not only to its size.

Many operators do not remain at one bench. They collect material, move trolleys, inspect assemblies, load machines, and walk between stores and production. For these people, footwear is often the practical way to maintain grounding while they move.

When footwear is the right choice

ESD footwear is useful in standing assembly, SMT support, stores, kitting, QA inspection, packing, and material movement. It works with a suitable floor system so charge generated on the body can dissipate while the person walks. Marvel Products lists antistatic slippers, shoes, slipons, heel straps, and conductive sole slippers under Personnel Grounding.

Economy and coverage

For simple static-safe environments, Conductive Sole Slippers provide an economical personnel grounding option for mobile users. The final choice should consider floor condition, comfort, shift duration, visitor control, and cleaning practices.

Footwear needs testing

Do not assume footwear is working because it is labelled ESD. Dirt, worn soles, wrong socks, damaged straps, or poor contact can make the system fail. Entry testing with the Wrist Strap and Footwear Tester helps confirm the operator is within the required resistance range before entering the EPA.

For best results, combine footwear rules with floor maintenance, daily records, and clear storage of approved ESD footwear. Mobile grounding only works when the whole path from person to floor to ground is maintained.

An ESD bench needs more than a mat and wrist strap. It needs a reliable grounding point that connects the operator, work surface, and accessories to a common reference. Poor grounding points are a common cause of inconsistent ESD protection.

Use a common point connection

A common point keeps the wrist strap and mat connected through the same grounding arrangement. This avoids random wiring and makes inspection easier. The connection should be secure, labelled, and positioned where operators can use it without stretching cords across the bench.

Choose the correct accessories

Marvel Products lists bench and grounding accessories under Miscellaneous Products, including bench mount dual connectors, 3 pin grounding plugs, ESD portable kits, and self adhesive copper tape. These products support the physical side of the grounding system.

Test the complete path

A connector can look fine while the path to ground is broken. Test the mat and surface-to-ground path regularly with a suitable instrument from ESD Instruments. For critical benches, continuous monitoring with the Single Cord Work Station Monitor can detect failures during work.

Avoid common mistakes

• Do not connect wrist straps to painted metal or unknown screws.
• Do not allow cords to be shared, stretched, or tied in knots.
• Do not use damaged snaps or loose banana jacks.
• Do not skip periodic resistance testing.

A clean grounding layout makes the bench safer, easier to audit, and easier for operators to use correctly.

Field service engineers often handle sensitive boards outside the controlled factory environment. They may work at customer sites, in repair rooms, on laboratory benches, or beside installed equipment. An ESD portable kit helps create a temporary protected workstation wherever the repair takes place.

Why field repair is risky

Unlike a production EPA, a customer site may have ordinary tables, plastic chairs, dry air, carpets, non-ESD packaging, and no tested grounding point. A board removed from equipment may be exposed to static during diagnosis, programming, connector cleaning, or replacement.

What a portable setup should include

A practical field kit should provide a safe work surface, a wrist strap connection, grounding accessories, and a way to pack or protect removed boards. Marvel Products lists Miscellaneous Products such as ESD portable kits and grounding accessories. For operator grounding, also review the Antistatic Wrist Strap.

Protect parts during return shipment

Failed boards and spare boards should not travel in ordinary plastic or paper envelopes. Use suitable Antistatic Packaging and, where required, shielding bags for transport back to the repair center.

Train service engineers to set up the kit before opening equipment, not after the board is already on the table. Portable ESD control is most effective when it becomes the first step in the service procedure.

Repair cells are high-risk areas because boards are handled repeatedly, often after they have already failed in the field. The work may involve diagnosis, soldering, programming, cleaning, inspection, and repacking. Each step creates another chance for ESD damage if the cell is not controlled.

Failure 1: untested wrist straps

A repair technician may wear a wrist strap all day, but the cord or contact can fail at any time. Use daily testing and replace worn straps promptly. Marvel Products’ Antistatic Wrist Strap and the Wrist Strap and Footwear Tester support this control.

Failure 2: unsafe temporary surfaces

Boards are often placed on paper, foam, plastic boxes, or ordinary trays during repair. Use approved ESD Work Surfaces and conductive trays or PCB carriers from Conductive Storage.

Failure 3: no packing control after repair

A repaired board may pass testing and then be damaged during dispatch. Use suitable Antistatic Packaging before moving the product out of the cell.

Failure 4: missing evidence

If there is no log of wrist strap tests, mat resistance checks, and corrective action, it is difficult to prove the repair process is controlled. Add simple records and audit them monthly.

Repair cells should be treated as production areas, not as informal troubleshooting corners. The product risk is the same, and sometimes higher.

Components and PCBs often move through several hands before the final product is complete. The danger is not only at the assembly bench; it is also in the transfer between workstations, inspection points, stores, and packing.

Create a defined transfer method

Every sensitive item should have a defined carrier, tray, bag, or rack. Avoid hand-carrying bare boards, stacking assemblies directly, or placing components in ordinary containers. Marvel Products’ Conductive Storage category includes bins, boxes, trays, PCB carriers, and component organisers for controlled movement.

Use packaging when the item leaves the EPA

If an item moves outside the ESD protected area, it should be packed for that journey. Use the correct option from Antistatic Packaging, such as antistatic bags, air bubble bags, or static shielding bags depending on risk and distance.

Train the handover point

Many failures happen during handover: one operator removes a board from a protected tray, another places it on an ordinary table, or QA moves it into a non-ESD bin. Use labels, colour coding, and short work instructions at each handover point.

Check people and surfaces

Movement control still depends on grounded people and safe surfaces. Review Personnel Grounding for mobile operators and use ESD instruments to verify benches and floors.

The safest transfer method is the one that operators can follow quickly, repeatedly, and without guessing.

Static eliminators are often installed and then forgotten. Over time, dust, fibres, oil mist, and process contamination can reduce ion output. A simple maintenance routine helps keep static control effective on moving webs, films, sheets, and industrial lines.

Why cleaning matters

Ionizing bars use emitter points to generate ions. If those points become contaminated, the ion balance and output can drop. The process may then show familiar symptoms again: sticking film, dust attraction, poor stacking, shocks, or unstable feeding.

Build a maintenance schedule

• Inspect the bar and cable condition during routine machine checks.
• Clean emitter points at intervals based on dust level and process speed.
• Confirm the power source is secure and protected from damage.
• Measure static before and after cleaning to confirm improvement.

Marvel Products’ Static Eliminator AC Bar is designed for eliminating charge on moving surfaces. The product page notes rugged construction, easy installation, and periodic cleaning as part of normal use.

Use measurement, not guesswork

A static charge meter from the ESD Instruments category can help confirm whether the bar is reducing charge at the required point in the process. If charge remains high after cleaning, check distance, placement, speed, grounding, and whether static is being generated again downstream.

Maintenance keeps static eliminators from becoming passive hardware. A clean and correctly placed bar actively improves process stability.

An ESD program is easier to manage when records are simple and consistent. Good records show that controls are working, reveal trends before failures happen, and support customer or internal audits.

What to record daily

Daily records should include wrist strap and footwear test results, entry failures, corrective action, and release back to work. For combined checks, use an entry-point instrument such as the Wrist Strap and Footwear Tester.

What to record periodically

Weekly or monthly checks can include bench mat resistance, floor resistance, work surface condition, storage area compliance, and packaging availability. Use suitable products from ESD Instruments, including the Digital Surface Resistivity Meter, to keep values measurable.

Calibration and confidence

Measurement instruments should be calibrated at a defined interval. Many facilities use a 12-month calibration cycle, but the exact schedule should match customer requirements, internal quality systems, and instrument usage. Record calibration dates, due dates, instrument IDs, and who performed each check.

Use records to improve

Do not keep records only for audits. Use them to find repeated failures, problem shifts, damaged cords, unsuitable footwear, or areas where mats fail earlier than expected. Link corrective actions to product categories such as Personnel Grounding, ESD Work Surfaces, Conductive Storage, and Antistatic Packaging.

The best ESD record system is short enough for operators to use and detailed enough for engineers to act on.

ESD mats are not simply protective table covers. Their job is to control charge on the work surface and provide a defined path to ground. Two common choices are static dissipative mats and conductive rubber mats, and the right choice depends on the parts handled, test method, operator safety, and grounding arrangement.

What a static dissipative mat does

A static dissipative mat allows charge to bleed away at a controlled rate. This is useful on electronics benches because sudden discharge can damage sensitive components. Dissipative surfaces are often chosen for assembly, inspection, rework, and packing benches where PCBs and ICs are handled manually.

What a conductive rubber mat does

A conductive rubber mat offers a lower resistance path and may be selected where a stronger grounding path is required. It should still be used as part of a safe grounding system, not as an isolated sheet on a bench. A mat without a correct ground cord and common point connection cannot protect the process.

How to choose

• Use the process risk: IC handling and PCB assembly usually need controlled dissipation.
• Check the work style: seated operators normally require wrist straps along with the mat.
• Verify the surface: periodic readings matter more than the mat’s age or appearance.
• Keep records: surface resistance values should be logged during audits.

Marvel Products groups these solutions under ESD Work Surfaces. For measurement and verification, use an instrument such as the Digital Surface Resistivity Meter.

The practical rule is simple: select the mat for the risk, ground it correctly, keep it clean, and test it on a schedule.

Visual inspection cannot prove that an ESD surface is working. A bench mat, floor mat, rack, tray, or laminate may look acceptable while its resistance value has moved outside the safe range. Surface resistivity testing gives the ESD team a measurable way to find these hidden gaps.

What should be tested

Common test points include workbench mats, floor mats, table tops, trolleys, storage racks, PCB carriers, conveyor surfaces, and packaging areas. Any surface that touches sensitive components should be included in the test plan. Do not limit testing to new installations; ageing, contamination, cleaning chemicals, and physical wear can change performance over time.

Why records matter

Single readings are useful, but trends are better. If a bench surface is slowly drifting, maintenance can act before it fails. If one area repeatedly shows high readings, it may point to a broken ground path, incorrect cleaning method, or non-ESD material introduced into the process.

Use the correct instrument

Marvel Products’ Digital Surface Resistivity Meter measures surface resistance and resistance to ground over a wide range for ESD protective materials. For a broader list of audit instruments, see ESD Instruments.

Surface testing should be part of incoming inspection for new ESD materials, routine audits for production areas, and corrective action after any ESD event. It replaces guesswork with evidence and helps maintain the ESD control plan across the full shop floor.