Learning the Difference Between Conductive, Dissipative, Insulative and Antistatic
Quick Answer
In ESD control, materials are classified by how quickly electrical charge moves through them. Conductive materials (surface resistivity <10⁵ Ω/sq) allow charge to flow freely and quickly. Dissipative materials (10⁵–10¹¹ Ω/sq) allow charge to flow in a controlled, slower manner — the ideal range for most ESD control applications. Insulative materials (>10¹¹ Ω/sq) hold charge indefinitely and cannot be grounded. Antistatic is a general term for materials that prevent static buildup — both conductive and dissipative materials qualify; insulative materials do not.
In this guide: Resistance explained, the four material classifications with resistance ranges, a comparison table, and how to measure surface resistivity.
When referring to ESD products, the terms conductive, dissipative, insulative, and antistatic are used to describe how materials interact with static electricity. If you don't know the difference, it can be very confusing — especially when selecting mats, packaging, garments, or flooring for an ESD-controlled area. For a complete ESD program guide, visit our ESD Program Essentials resource hub.
What Is Resistance?
Resistance is the foundational concept for understanding ESD material classifications. For ESD control purposes, materials are classified by how quickly electrical charge moves through them. The speed is referred to as the "resistance" of the material — how strongly the material resists charge movement.
Resistance is measured in Ohms (Ω) and is typically expressed in powers of 10. The lower the resistance value, the more easily charge flows through the material. The higher the resistance, the more the material holds charge in place.
The Four ESD Material Classifications
The following ranges and definitions are from ESD Association and EIA standards publications:
Conductive Materials
With low electrical resistance, electrons flow easily across the surface or through the bulk of conductive materials. Charges go to ground or to another conductive object that the material contacts or comes close to. Conductive materials have a surface resistivity less than 1 × 10⁵ Ω/sq or a volume resistivity less than 1 × 10⁴ Ω-cm. Conductive materials are classified as antistatic. Examples include metal, carbon-loaded plastics, and conductive flooring.
Dissipative Materials
For dissipative materials, charges flow through the material slowly and in a more controlled manner than with conductive materials. This controlled flow is actually preferable for many ESD applications — it prevents the rapid discharge that can damage sensitive components. Dissipative materials have a surface resistivity of 1 × 10⁵ to 1 × 10¹¹ Ω/sq or a volume resistivity of 1 × 10⁴ to 1 × 10¹¹ Ω-cm. Dissipative materials are classified as antistatic and are considered the ideal range for ESD control materials including mats, bags, and garments.
Insulative Materials
Insulative materials prevent or limit the flow of electrons across their surface or through their volume. They have high electrical resistance and cannot be grounded. Static charges remain in place on insulative materials for a very long time — making them a persistent ESD hazard in any controlled environment. Insulative materials have a surface resistivity of at least 1 × 10¹¹ Ω/sq or a volume resistivity of at least 1 × 10¹¹ Ω-cm. Insulative materials are not classified as antistatic. Standard plastic bags, cardboard, and most packaging materials are insulative.
Antistatic
Antistatic is a general term used to describe materials that prevent the buildup of static electricity. Both conductive and dissipative materials may be classified as antistatic depending on their resistance values. Insulative materials are not antistatic. The term is often used loosely in product marketing — when precision matters, always check the actual resistance specification rather than relying on the label alone.
Quick Reference: ESD Material Classification Ranges
| Classification | Surface Resistivity (Ω/sq) | Antistatic? | Typical Use |
|---|---|---|---|
| Conductive | < 1 × 10⁵ | Yes | Flooring, mats, grounding straps |
| Dissipative | 1 × 10⁵ – 1 × 10¹¹ | Yes | ESD bags, mats, garments, trays |
| Insulative | > 1 × 10¹¹ | No | Standard plastics, cardboard (avoid in EPAs) |
How to Measure Surface Resistivity
The SRM200 Surface Resistance Meter is an easy-to-use tester for measuring surface resistivity. It uses parallel electrodes to accurately measure RTT, RTG, or resistivity for periodic verification, factory audits, or test lab evaluation.
This meter is designed for use across engineering, maintenance, quality control, incoming inspection, and manufacturing departments for testing ESD mats, floor finishes, paints, wrist straps, ESD garments, footwear, bags, and containers. The SRM200 meets periodic test requirements per Compliance Verification ESD TR53 and conforms to ANSI/EOS/ESD (S4.1, S7.1, S12.1, S2.1).
Frequently Asked Questions
What is the difference between conductive and dissipative materials in ESD control?
Conductive materials (surface resistivity <10⁵ Ω/sq) allow charge to flow freely and quickly to ground. Dissipative materials (10⁵–10¹¹ Ω/sq) allow charge to flow in a slower, more controlled manner. For most ESD control applications, dissipative materials are preferred because the controlled discharge rate reduces the risk of damaging sensitive components through rapid charge transfer. Both are classified as antistatic.
What does antistatic mean?
Antistatic is a general term for materials that prevent the buildup of static electricity. Both conductive and dissipative materials qualify as antistatic based on their resistance values. Insulative materials — which hold charge indefinitely — are not antistatic. The term is often used loosely in product marketing, so always verify the actual resistance specification when selecting materials for an ESD-controlled environment.
Why are insulative materials a problem in ESD-controlled areas?
Insulative materials (surface resistivity >10¹¹ Ω/sq) cannot be grounded — static charges remain on their surface indefinitely. This makes them a persistent ESD hazard in any controlled environment. Common insulative materials include standard plastic bags, cardboard boxes, Styrofoam, and most packaging materials. These should be kept out of ESD-protected areas (EPAs) or neutralized with an ionizer, which is the only way to address charge on insulative surfaces.
What resistance range is ideal for ESD control materials?
The dissipative range — surface resistivity of 1 × 10⁵ to 1 × 10¹¹ Ω/sq — is considered ideal for most ESD control materials including mats, bags, garments, and trays. Dissipative materials allow charge to flow to ground in a controlled manner that is fast enough to prevent static buildup but slow enough to avoid the rapid discharge that can damage sensitive components. This is why most ESD-rated products are designed to fall within the dissipative range.
How do I measure whether a material is conductive, dissipative, or insulative?
Surface resistivity is measured using a surface resistance meter with parallel electrodes, such as the SRM200. The meter applies a known voltage across the surface and measures the resulting current to calculate resistance in ohms per square. Results below 10⁵ Ω/sq indicate a conductive material; 10⁵ to 10¹¹ Ω/sq indicates dissipative; above 10¹¹ Ω/sq indicates insulative. Regular surface resistivity testing is required under ANSI/ESD S20.20 for mats, flooring, and other ESD control surfaces.
Content courtesy of Transforming Technologies.
For more on ESD compliance standards and testing, visit our Cleanroom Compliance & Best Practices guide and our ESD Program Essentials hub.
