If you’ve ever walked through a electronics manufacturing floor, you’ve probably seen a small antistatic wrist strap hung by an assembly line, or a warning sign on a box of microchips that says “ESD Sensitive.” For us as an ESD supplier, we talk about ESD risk assessment all the time—but not everyone knows it’s the backbone of any effective static control program. Too many teams skip this step, buy random antistatic products, and end up with damaged parts, rework costs, and even product recalls. A proper ESD risk assessment isn’t just checking boxes on a compliance form; it’s a practical, site-specific process that identifies where static electricity could harm your products, equipment, or people. Over the 15+ years we’ve been in this business, we’ve worked with small startups and large automotive manufacturers, and the ones that avoid ESD issues always start with a detailed risk assessment. Let’s break down exactly how to do it right, from the initial walkthrough to the final report, and why it matters for your bottom line. ESD
First, what even is an ESD risk assessment? At its core, it’s a systematic review of your entire workspace, processes, and materials to find sources of static, vulnerable items, and gaps in your current controls. It answers three key questions: What can generate static electricity? What is at risk of being damaged by that static? And how likely is that damage to happen, and how severe would the consequences be? If you skip this, you might waste money on an overhead ESD mat for a desk that never handles sensitive components, or miss a big static source from a brand-new conveyor belt that’s damaging every batch of PCBs. We’ve seen a client do this last year: they installed antistatic workstations across their entire SMT line, but didn’t test the plastic tote bins they used to transport boards between steps. Those bins were generating 8,000 volts of static when dragged across the floor, which was enough to kill the tiny transistors on their 5G modules. They didn’t catch this until a third-party audit, and the rework cost them $120,000 in two weeks. That’s exactly why the assessment has to be comprehensive, not just a quick check of wrist straps.
Let’s start with the pre-assessment prep. You can’t walk into a space and know what to look for without some background info. First, gather all your product specifications: which components are ESD sensitive? For example, a microcontroller might have a damage threshold of 250 volts, while a high-power resistor might not care unless the static is high enough to cause a shock hazard. We keep a quick reference guide in our office that lists common ESD sensitive parts and their voltage thresholds—this is the first thing we share with new clients before an on-site assessment. Next, map your workspace: draw a simple layout of every area that handles sensitive parts, including storage zones, assembly lines, testing stations, and shipping docks. Note any equipment that moves or touches your products: conveyor belts, robotic arms, storage bins, packaging materials. Also, talk to your operators—they’re the ones who are there every day, and they’ll notice little things like a new floor finish that makes their shoes generate more static, or a workbench that feels “shockier” than others. We always schedule a 15-minute chat with line leads before any assessment; last year, a supervisor told us their new packaging tape was leaving residue on PCBs and building up static, which we never would have found just looking at a spec sheet.
The next step is the on-site walkthrough, where you’ll measure static voltages and observe processes. This is the most hands-on part, and it’s where most teams cut corners. First, test the static generation in common work practices: have an operator pick up a sensitive part from a plastic bag, move it across a workbench, and set it down, then measure the voltage on the part and the workbench surface. Do this with different shoes—some footwear, like rubber soles, generate way more static than antistatic shoes. Test materials you might not think about: packing foam, cable wraps, even the plastic chairs operators sit on. We always carry a hand-held electrostatic field meter and a surface resistance meter—these two tools are non-negotiable. The field meter will tell you how much voltage is being generated, while the resistance meter checks if a surface is conductive, antistatic, or insulating. Insulating materials (like regular plastic) can hold static charges for hours, while conductive materials drain static immediately. For example, if your workbench surface is insulating, that’s a big risk because static can build up on the bench and transfer to parts. We also test the environment: relative humidity. Static generation goes way up when humidity is below 30%, because dry air doesn’t conduct electricity well. If your factory is in a dry climate or uses industrial dehumidifiers, you might need to adjust humidity levels or add moisture to materials to reduce static. We once worked with a aerospace client in Arizona where humidity was consistently 22%—their main issue wasn’t equipment, it was dry air making every surface generate 5,000+ volts. The fix was a simple industrial humidifier in the ESD protected area (EPA) that cut static voltages by 70%.
Once you have all your measurements, you need to assess the risk level of each issue. Not every static source is a critical problem—you have to prioritize based on how much damage it could cause. We use a simple risk matrix: score each risk on two factors: likelihood (how often does this happen? 1 = rare, 5 = daily) and severity (how much would this cost if it happens? 1 = minor rework, 5 = product recall, safety hazard). Multiply them, and any score over 10 is a high-priority risk, 5-9 is medium, and below 5 is low. For example, a wrist strap that doesn’t work when operators are wearing thick gloves: likelihood is 4 (most operators wear gloves), severity is 5 (damaged PCBs can be recalled), so score 16—high priority. On the other hand, a poster on the wall that’s made of insulating plastic: likelihood is 1 (no one touches it), severity is 2 (rarely interacts with parts), score 2—low priority, you can address that later. This matrix helps teams focus their budget on the things that will actually prevent losses, not just the latest trendy ESD product.
Now, let’s talk about common mistakes we see in risk assessments, especially from teams that don’t work with ESD regularly. One big one is only testing the workstations and forgetting about storage. We had a customer who spent $50,000 on ESD workstations, but stored their sensitive parts in regular plastic bins on a metal shelf. When they pulled a part out, the static from the bin arced to the shelf, damaging 10% of their inventory. Another mistake is ignoring non-static risks that tie into ESD: like improper grounding of equipment, or operators not training on correct static control practices. A wrist strap is only effective if it’s connected to a proper ground point, not a random screw on a workbench. We’ve also seen teams test static voltages once, when they first set up a line, but not re-test after changes. A new floor, a different type of packaging material, or even a change in shift staff can all alter static levels. That’s why we recommend re-doing a full ESD risk assessment at least once a year, and doing spot checks after any process changes.
Another key part of the assessment is identifying non-product risks: static can harm equipment or even people. If a high-voltage arc hits a sensitive test instrument, it could damage the instrument’s circuit board, leading to calibration errors. For operators, even a small static shock might not damage a part, but it’s uncomfortable and can distract them, leading to mistakes down the line. We once helped a medical device client where operators were getting small shocks from their workbenches—no parts were damaged, but line errors went up 15% because operators were nervous about touching parts. Fixing the workbench surface to be antistatic eliminated the shocks and brought errors back down.
Once you’ve completed the assessment, you need to put together a clear action plan. Don’t just list the risks—tie each fix to a specific cost and timeline. For high-priority risks, like broken wrist straps or insulating storage bins, act within 30 days. Medium-priority, like training or humidity adjustments, within 90 days. Low-priority can be handled when you have extra budget. As an ESD supplier, we don’t just sell products—we help clients turn their risk assessment into a plan. For example, if your assessment finds that 60% of operators’ wrist straps aren’t grounded correctly, we can provide training on proper ground points, plus affordable grounding cords that are easy to check. If your storage bins are the issue, we have a range of antistatic bins that are compatible with your existing shelves, so you don’t have to replace everything at once. We always emphasize that the action plan doesn’t have to be a full overhaul—small, consistent changes are more effective than big, expensive projects that get abandoned.
Finally, don’t forget that an ESD risk assessment isn’t a one-time project. Static generation and risks change over time, so your assessment should evolve too. Every time you add a new product, a new piece of equipment, or change your facility layout, do a quick check to make sure static risks haven’t changed. We offer annual assessment updates for all our clients, because even the best program can slip if you don’t stay on top of it. Last year, a client added a robotic conveyor system to their line—they didn’t do an assessment on the new equipment, and the conveyor’s plastic rollers were generating 10,000 volts, damaging $20,000 worth of parts. A quick pre-install assessment would have caught that, and we could have recommended antistatic rollers before they started production.
At the end of the day, ESD risk assessment is about protecting your most valuable assets: your products, your reputation, and your bottom line. We’ve seen teams save hundreds of thousands of dollars in rework and recalls by taking the time to do a thorough assessment, and we’ve seen teams lose business because they skipped this step. If you’re not sure where to start, or you want a second look at your current process, we’re here to help. We can walk through your facility, measure static risks, and help you build an action plan that fits your budget and needs. Don’t wait for a bad batch or an audit to force you to fix this—take control of your ESD risks today.
Want to discuss your specific needs and build a tailored ESD solution? Reach out to our team to connect with our procurement department to start the conversation.
Transistor References
- ANSI/ESD S20.20-2022, ESD Association Standard for an Electromagnetic Static Control Program
- ESD Handbook, ESD Association, 2021
- “Static Electricity Damage in Electronics Manufacturing,” Journal of Electrostatics, Vol. 95, 2018
- OSHA Guidelines for Static Control in Industrial Facilities, 2020
- “Humidity’s Impact on Static Generation in Dry Environments,” International Journal of Industrial Ergonomics, Vol. 72, 2019
Tongke Electronic Co., Ltd
Tongke Electronic Co., Ltd. is one of the most experienced esd manufacturers and suppliers in China, featured by quality products and low price. Please rest assured to wholesale advanced esd made in China here from our factory. Contact us for pricelist.
Address: No.3,Chayuan Rd, Street 3, AilingKan, Dalingshan, Dongguan, Guangdong, China.
E-mail: jack@ctk-elec.com
WebSite: https://www.ctkchip.com/
