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Electrostatic discharge (ESD) is the sudden release of static electricity between two objects with different electrical charges.
Have you ever felt a sudden zap when touching a doorknob or screen? This familiar shock is caused by static electricity. In everyday situations, it is harmless but in electronics, electrostatic discharge (ESD) can cause serious and costly damage to sensitive components.
This guide explains everything you need to know about electrostatic discharge (ESD), including what it is, what causes it, the types of damage it can create, and the most effective ways to prevent it in professional and industrial environments.
Static electricity is a build-up of electric charge on the surface of a material, usually caused by friction between two different materials.
All materials are made of atoms containing protons (positive), neutrons (neutral), and electrons (negative). When materials come into contact or rub together, electrons can transfer from one surface to another — a process known as triboelectric charging.
If the material is an insulator, the charge cannot move freely and remains on the surface. This stored charge is what we call static electricity.
Electrostatic discharge (ESD) is the sudden flow of electricity between two objects with different electrical charges. It occurs when built-up static electricity is released, often in a fraction of a second.
In technical terms, ESD is an uncontrolled electrical discharge that occurs when two objects at different electric potentials come into contact, near-contact, or are connected through a conductive path. The charge equalises rapidly sometimes in nanoseconds generating heat and electromagnetic energy that can damage nearby components.
In simple terms, ESD is the “shock” caused when static electricity suddenly moves between two objects.
Electrostatic discharge can occur when two surfaces come into contact or interact and create an imbalance of electrical charge. Common causes include walking over synthetic floors, rubbing clothing, handling plastic materials, or moving components across surfaces.
When this happens, one surface becomes positively charged and the other negatively charged. If the charged object comes into contact with a conductive path, the stored energy is released instantly as an ESD event.
The amount of static electricity generated depends on several factors, including the materials involved, the level of friction, and environmental conditions such as humidity. In dry environments, static charge builds up more easily and discharges more frequently.
In everyday environments, many ESD events occur without being seen or felt. Typically, a person only feels a discharge at around 2,000 volts, but sensitive electronic components can be damaged by as little as 10 to 100 volts.
While static shocks are usually harmless to people, ESD is a serious issue in electronics manufacturing and handling environments. Even small discharges can burn, melt, or weaken sensitive components such as printed circuit boards and microchips.
ESD damage can result in:
Electrostatic voltage levels can vary widely depending on the activity and environment. Even everyday actions can generate thousands of volts of static electricity.
Common examples include:
In most cases, people do not feel a static shock until it exceeds around 2,000 volts, which means many ESD events go completely unnoticed.
Sensitive electronic components can be damaged by extremely low voltage levels.
In many cases, as little as 10 volts is enough to cause damage, depending on the size and sensitivity of the component. However, humans typically cannot feel static discharge below around 2,000 volts.
To meet industry standards, the maximum allowable electrostatic voltage within an Electrostatic Protected Area (EPA) is typically 100 volts, ensuring safe handling of sensitive devices.
ESD damage falls into two categories, and both are serious:
The component is immediately and visibly destroyed. Circuits are burnt out, junctions are melted, and the device fails to function at all. This type of damage is at least easy to detect during testing.
The component appears to work normally after the ESD event but has been weakened internally. It may fail hours, days, or months later — often during use by the end customer. Latent defects are far more dangerous because they are difficult to catch in quality control and generate costly warranty claims and reputational damage.
Industries most exposed to ESD risk include:
Electrostatic discharge (ESD) is a serious and costly issue across many industries, particularly those that rely on sensitive electronic components. In fact, people are the primary source of electrostatic charge in most environments, making ESD difficult to control without proper systems in place.
A Long-Standing Industrial Challenge
Static electricity has been recognised as an industrial risk for centuries. As early as the 1400s, European forts used static control methods to prevent electrostatic discharge from igniting gunpowder and explosives.
The phenomenon of electrostatic discharge has been understood since ancient civilisations, with its effects more noticeable in dry, low-humidity environments where static charge builds up more easily.
The impact of ESD increased significantly with the evolution of electronics:
As electronic components became smaller and more powerful, they also became far more vulnerable to even minor electrostatic discharges.
Today, ESD is widely recognised as a major cause of electronic component failure. Damage caused by ESD costs the global electronics industry billions each year.
Electrostatic discharge can:
In high-risk environments such as cleanrooms, laboratories, and production lines, static discharge can also:
Even very small amounts of static electricity can cause damage:
This means many damaging ESD events happen completely unnoticed.
Industries such as aerospace, medical devices, electronics manufacturing, and data centres rely on highly sensitive components. In these environments, even a minor failure can lead to significant financial loss, safety risks, or system failure.
Without proper ESD control measures, businesses risk:
This is why implementing effective ESD protection is not optional — it is essential for maintaining product quality and reliability.
ESD is not just a laboratory concern. It shows up in everyday situations:
| Situation | ESD Cause |
| Touching a door handle after walking on carpet | Triboelectric charging from footwear and carpet |
| Unpacking a motherboard from a bag | Contact/separation between board and packaging |
| Handling a memory module without a wrist strap | Charge transfer from hands to component pins |
| Plugging in a USB device in dry conditions | Induction from the user’s charged body |
| Moving across a workbench with synthetic clothing | Friction between fabric and chair/surface |
ESD symbols are standardised markings used to identify electrostatic-sensitive devices and ESD-protective equipment. They help users recognise where precautions are required to prevent electrostatic discharge damage in electronics handling and manufacturing environments.
The ESD protective symbol identifies products designed to prevent electrostatic discharge, such as bags, garments, and containers.
Just like the ESD susceptibility symbol, the ESD protective symbol features a hand inside a triangle. However, it includes an arc above the hand and does not have a diagonal slash — indicating protection rather than sensitivity.
This symbol is used on ESD protective products that provide at least one static control property. It is also commonly referred to as the ESD packaging symbol.
It is used to designate ESD-safe items such as:
A letter is often added under the symbol to indicate its function:
Colour of the ESD Protective Symbol
The color is optional except “the color red shall not be used because it suggests a hazard to personnel.” [ANSI/ESD S8.1 clause 5.2.1 color].
Normally, a hand symbol is used on a black triangle on a yellow background.
The ESD susceptibility symbol indicates that a device is sensitive to electrostatic discharge and must be handled using proper ESD precautions.
This symbol features a hand inside a triangle with a diagonal slash, clearly warning that the item is vulnerable to static damage.
It is used to identify:
Correct usage includes:
Colour of the ESD Susceptibility Symbol
The color is optional except “the color red shall not be used because it suggests a hazard to personnel.” [ANSI/ESD S8.1 clause 4.2.1 color].
Normally, the hand and slash symbol is used on a black triangle on a yellow or orange background.
| Symbol Type | Meaning | Where Used |
| Protective Symbol | Identifies ESD-safe products | Packaging, garments, EPA tools |
| Susceptibility Symbol | Warns device is ESD-sensitive | Components, PCBs, work areas |
ESD prevention is not a single action — it is a system of controls applied together. In professional settings, this system is formalised as an Electrostatic Protected Area (EPA), where every element of the environment is designed to prevent charge buildup and discharge.
Anti-static wrist straps connect the wearer to earth ground through a 1 megaohm resistor. This safely bleeds off any charge the person accumulates during work. Heel grounders and ESD footwear serve the same purpose when working while standing.
Standard work surfaces accumulate and hold charge. ESD-safe mats and benchtops are made from dissipative or conductive materials that allow charge to flow to ground slowly and safely, rather than remaining on the surface or discharging suddenly.
Conductive and dissipative ESD flooring materials provide a controlled path for electrical charge from personnel and equipment to ground, operating in conjunction with ESD footwear to ensure continuous grounding across the facility.
Ionisers generate positive and negative ions that neutralise static charges on surfaces that cannot be grounded such as non-conductive materials, packaging, or products in transit on conveyor systems. Bench-top ionisers and overhead ionising blowers are common in assembly environments.
Maintaining relative humidity between 40% and 60% in work areas reduces static generation significantly. At higher humidity, moisture on surfaces provides a natural conductive path that dissipates charge gradually.
Components must be stored and transported in shielding bags or conductive containers. Standard plastic bags and foam packaging are triboelectric and will charge the components they are meant to protect.
Nowadays, investing in ESD protection is an essential element of all electronics-based industries as it’s applied in every manufacturing, production, repair, and testing stage.
Many industries want to avoid the occurrence of an ESD event and reduce static discharge in the workplace. By ensuring you have the essential EPA equipment, you would prevent the risk of static discharge from damaging components and entering your EPA.
1) Assume that all active components are sensitive to ESD.
2) Handle electronic components only in the ESD protected area (EPA) and only when you are correctly grounded.
3) Store and transport the ESD-sensitive items in ESD protective containers.
4) Check regularly the ESD protection system, internal and external (suppliers).
An EPA (ESD Protected Area) is a defined space where no items or activities can cause damage to a sensitive device. In the simplest case, a workstation may consist of a dissipative mat, a wrist strap and a standard grounding facility for both. The maximum allowed electrostatic field in an EPA is 100V/cm.
Once you have established an Electrostatic Protected Area (EPA), you then have a designated space where you can handle static-sensitive components safely.
International standards define best practices for ESD control programs, providing measurable benchmarks for compliance:
Compliance with these standards is increasingly required by OEMs, contract manufacturers, and regulated industries. Certification demonstrates to customers that a facility has effective, audited ESD controls in place.
Do your employees require ESD training? Improve your employee’s knowledge of electrostatic discharge with Bondline’s ESD training course. Our program is excellent for those who are complete beginners to ESD, and even those who would like to refresh their knowledge. The course is ideal for production personnel, engineers, support staff, managers and even purchasing staff who require some basic knowledge on ESD.
Why invest in ESD training for your employees? By taking our course, your employees will not only learn about the causes of static generation, the effects of static discharge, and the materials and methods necessary for prevention and protection, but also help them to avoid common ESD control mistakes.
Our ESD training course can be tailored to your requirements at your own premises, so your employees can be learning at the comforts of their own workplace. The course content will reflect the facilities and current practice.
Understanding the phenomenon is enhanced through practical demonstrations and audience participation. Courses can also be presented on a ‘one-to-one’, ‘train-the-trainer’ basis.
Costs will depend on the amount of information/training required. All training is designed to meet the requirements of IEC-61340-5. Please contact us below if you would like more information about our ESD training course.
Electrostatic discharge is one of the most underestimated risks in electronics handling. It is invisible, often silent, and its effects can be delayed making it difficult to detect until significant damage has already been done to products and reputation.
Understanding what ESD is, how it is generated, and the mechanisms by which it damages components is the foundation of any effective prevention strategy. Whether you are equipping a single workbench or designing a full-scale EPA for a manufacturing facility, the principles remain the same: control the charge, ground the people, protect the components.
For businesses that handle sensitive electronics at any scale, investing in proven ESD control measures is not optional it is essential to product quality, reliability, and customer trust.
Ans. ESD is the sudden release of built-up static electricity from one surface to another. It is the same principle as the shock you receive from a door handle in winter but in electronics, even tiny discharges can cause permanent damage.
Ans. Static electricity is the accumulated charge sitting on a surface. ESD is the event the moment that charge moves rapidly to another surface. Static electricity is the stored energy; ESD is the discharge of that energy.
Ans. Yes. Most damaging ESD events in electronics are completely invisible and unfelt by the handler. The human body cannot detect voltages below about 3,000 volts, but electronic components can be destroyed by as little as 10 to 100 volts.
Ans. A latent defect is damage caused by ESD that does not immediately disable the component. The device appears to pass testing but has been weakened internally. It fails later sometimes during customer use making latent defects particularly costly and difficult to trace back to an ESD event.
Ans. The most effective approach is establishing an Electrostatic Protected Area (EPA) using a combination of anti-static wrist straps, ESD-safe flooring, dissipative work surfaces, ionisers, humidity control, and proper ESD-safe packaging. Using any single method alone provides only partial protection.
Ans. No. ESD is relevant anywhere electronic components are handled including IT equipment maintenance, data centre operations, medical device assembly, automotive electronics, and even consumer electronics repair. Any person working with circuit boards, memory modules, processors, or similar components should follow ESD precautions.
Our company’s objective is to prevent ESD with our diverse range of anti-static products. Using our anti-static products can prevent further damage to electrical components and devices whilst also promoting a static-safe working environment.
If you would like further advice on how to control ESD or are interested in our ESD training programme, please contact our sales team on [email protected] or 01793 511000, where we will be happy to help you find a solution to answer any queries.
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