Anyone who has felt a small spark from a door handle after walking across a carpet has met electrostatic discharge. For people it is a nuisance. For modern electronics it can be a hidden killer. A discharge too small for a person to feel can damage a sensitive component, cause a latent defect that fails later or corrupt data. In facilities that build, repair or house electronics, controlling static is a basic part of quality and reliability. Request a free estimate to discuss your project.
The floor plays a surprising role. It is the one surface that every person and every cart touches, and it can be designed to drain static charge safely to ground. This article explains how ESD flooring works, what the terms mean and how a floor fits into a wider program. For the service itself, see our ESD and anti-static epoxy page.
What Static Electricity Is and Why It Matters
Static charge builds up when two materials touch and separate, for example when a shoe sole leaves a floor or when a cart rolls. The charge stays on an insulating surface, because it has nowhere to go. When a charged object comes close to a grounded or differently charged object, the charge jumps across in a tiny spark.
Walking across an ordinary insulating floor can generate thousands of volts on a person’s body, depending on humidity and materials. Many electronic components can be damaged at levels far below what humans can feel. In electronics assembly, semiconductor handling, repair labs and data centres, that risk justifies a controlled environment.
How an ESD Floor Controls Static
An ESD floor is designed so that charge on a person or object that touches it can flow away to ground at a controlled rate, rather than building up or discharging suddenly. Two things make that possible: the floor material and the grounding system.
Conductive or Dissipative Materials
ESD floors contain materials that allow electrical charge to move. They are commonly described as conductive or dissipative, based on their electrical resistance. A frequently cited convention treats floors with very low resistance to ground, on the order of less than one million ohms, as conductive, and those with higher resistance, up to roughly one billion ohms, as dissipative. Exact limits and test methods are set by the standards your program follows, and sources do not always draw the boundary in the same place, so always confirm against the current standard.
A Grounding Network
A floor does nothing unless it is connected to ground. During installation, grounding points are connected to the building’s electrical grounding system, often through conductive copper tape laid under the coating, and the coating is applied over and in contact with it. The number and position of grounding points are planned for the size and layout of the room and verified after installation.
The floor works with what people wear. A static-control floor drains charge from people through their footwear. If staff wear insulating shoes, the best floor in the world cannot help. Footwear, floors and procedures have to be considered together.
Standards and Testing
Static control programs for electronics commonly follow ANSI/ESD S20.20, which sets requirements for an ESD control program, and test floors using methods in ANSI/ESD STM7.1, which describes how to measure the electrical resistance of floor materials and installed systems. The International Electrotechnical Commission publishes related standards in the IEC 61340 series. Your customers, auditors and quality system may specify which standard applies and what resistance range is acceptable.
Testing does not end on installation day. Resistance can change as a floor wears, collects dirt or is cleaned with products that leave an insulating film. Regular testing, as part of your ESD program, keeps performance in range. The standards also address body voltage, the charge that builds up on a person walking on the floor in typical footwear, and a floor that passes a resistance test still needs to deliver acceptable results in use.
Where ESD Floors Are Used
- Electronics manufacturing and assembly: production lines where components are handled
- Semiconductor and cleanroom-adjacent areas: where particle and static control are both critical
- Repair and test labs: benches and areas where boards and devices are opened
- Data centres and server rooms: to protect equipment during installation and maintenance
- Explosive or flammable environments: where a static spark could ignite vapours or dust, though these need specialist engineering
- Medical device and aerospace work areas: where electronics are built or maintained
Epoxy as an ESD System
Many ESD floors are built from epoxy or polyurethane-based systems formulated with conductive materials. They have advantages for industrial environments: they are seamless, durable and easy to clean, and they can be installed over existing concrete. A typical system includes grounding copper strips connected to building ground, a conductive primer or layer and a static-dissipative topcoat. The topcoat sets the electrical performance, the wear resistance and the appearance, including colour and gloss.
Because ESD performance depends on the system as a whole, a floor that looks like ordinary epoxy can behave very differently. Only systems formulated and installed for ESD should be used for static control areas. Our article on why epoxy floors fail explains why preparation and installation quality matter, and in ESD floors the consequences extend to electrical performance as well.
Installation and Preparation
- Slab assessment: condition, moisture and flatness are checked before design
- Preparation: diamond grinding and repair give a clean, sound surface for the system
- Grounding layout: copper strips or other grounding points are installed according to the design and connected to ground
- Layer-by-layer application: each layer is applied to a controlled thickness, with checks on conductivity as the system builds
- Verification: resistance testing after cure confirms the floor meets the required range
- Handover: documentation, cleaning instructions and a retest schedule
Moisture matters here too, since it affects both bond and electrical behaviour. See our article on concrete moisture testing before epoxy for why we test.
Keeping an ESD Floor Working
- Clean with products approved for ESD floors, since some cleaners and polishes leave insulating residues
- Avoid applying wax, polish or unapproved sealers to the surface
- Keep the floor free of dust and dirt that can interfere with grounding
- Test resistance regularly and after any repair or recoating
- Check grounding points and connections periodically
- Control what rolls across the floor, including carts and wheels, with ESD-suitable components
Questions to Ask Before You Specify an ESD Floor
- Which standard and resistance range does our ESD program require?
- Is conductive or dissipative the right choice for our process and footwear?
- How many grounding points are needed, and how will they be verified?
- How will the installed floor be tested, and by whom?
- What cleaning method and products are approved?
- How will repairs and future recoating be handled without losing performance?
Common Mistakes with ESD Floors
- Treating the floor as standalone. Static control depends on footwear, grounding, procedures and the floor together.
- Using a standard coating in a controlled area. An ordinary epoxy can act as an insulator and make static problems worse.
- Forgetting to test after installation. Assumed performance is not verified performance.
- Letting cleaning products leave a film. Residue can raise resistance and defeat the floor.
- Skipping periodic retesting. Wear and contamination change electrical performance over time.
A short conversation with your ESD coordinator before specifying the floor avoids most of these problems.
Key Takeaways
- ESD floors drain static charge to ground at a controlled rate, protecting sensitive electronics
- They rely on conductive or dissipative materials plus a verified grounding network
- The floor works together with footwear, workstations and procedures, not on its own
- Testing after installation and at regular intervals keeps performance in range
- Use the standards and limits your own ESD program requires, and confirm them before design
Why you can rely on this guidance. Supreme Epoxy is a commercial, industrial and residential flooring contractor established in 2019, WSIB and business insured, with a 4.9 out of 5 rating from 117 Google reviews. We install the floors we write about, including warehouses completed in as little as three days and overnight installs for operations that cannot stop. This article is general information, not engineering or legal advice. We install static-control floors as part of a verified system and plan testing and handover with your quality team. Every site is different, so confirm requirements for your own space.
Standards and Sources
These public sources are useful starting points. Standards are updated, so check the current version and the requirements of your own ESD program.
- ESD Association: publishes ANSI/ESD S20.20 (development of an ESD control program) and ANSI/ESD STM7.1 (resistive characterization of floor materials and installed floor systems)
- International Electrotechnical Commission, IEC 61340 series: international standards on electrostatics
- The technical data sheet and test reports of the chosen ESD floor system, which state its electrical performance
Resistance limits and test conditions differ between standards and between programs, so rely on the documents your program follows rather than on general ranges.
Plan Your ESD Floor
A static control floor is a technical system, so the best starting point is a conversation with your quality and engineering team. Book a free site visit and we will review the area, discuss your standards and testing needs and give you a written proposal.
