EN 1081 Flexible, Laminate and Modular Multilayer Flooring - Determination of Electrical Resistance

The European standard “EN 1081 Flexible, laminate and modular multilayer flooring – Determination of electrical resistance” describes test methods for determining the following properties of flexible, laminate and modular multilayer flooring according to the test piece or assembly:

• Vertical resistance
• Resistance to soil
• Surface resistance

For the purposes of this standard, the following terms and definitions apply:

• Vertical resistance: This is the electrical resistance measured between a tripod electrode on the surface of the test piece and an electrode attached to the bottom of the test piece.
• Ground resistance: The electrical resistance measured between a charged three-pronged electrode on the surface of the floor covering and the ground.
• Surface resistance: This is the electrical resistance measured between two three-pronged electrodes placed 100 mm apart on a floor covering.

Method A: For vertical resistance, or when measurements are performed in a laboratory, a representative sample is taken from the entire available material. In the case of rolls, approximately one-third of the test piece is taken from the area near the edges, such that the distance between the outer edge of the sample and the nearest edge of the roll is between 50 mm and 100 mm.

The main equipment used in the tests are:

• Tripod electrode: It should consist of a triangular aluminum plate with an insulating layer on its upper surface and three cylindrical conductive rubber feet placed 180 mm apart on its lower surface. The hardness of the rubber feet should be between 50 IRHD and 70 IRHD according to the ISO 48 standard, and the electrical resistance of each rubber foot should be less than 103 Ohms when tested between two metal surfaces. This type of soft electrode can provide closer contact with a smooth ground surface, and in practice, this type of electrode is the most satisfactory.
• Load: The tripod must be able to apply a minimum force of 300 N on the electrode. This can be achieved using a person's body weight. In Method C, a person can stand with one foot on each electrode.
• Power supply: Must meet the requirements specified in the EN 62631-3-1 standard.
• Resistance meter: Must meet the requirements given in the EN 62631-3-1 standard. It must be calibrated to determine the resistance of the floor covering with an accuracy of plus/minus 5% in the range of 103 Ohms to 1010 Ohms, and plus/minus 10% for resistances greater than 1010 Ohms. The open-circuit voltage should be 10 V DC for resistances less than or equal to 106 Ohms, and 100 V DC if possible for resistances greater than 106 Ohms. If not possible, 500 V DC should be used. Alternatively, a device with an internal resistance of 100 kOhms and compatible with digital current reading can be used.
• Temperature and humidity: Temperature and humidity measuring devices should have an accuracy of plus/minus 2 degrees Celsius for temperature and plus/minus 5 percent for relative humidity, respectively.

EN 1081 is a key European standard that includes test methods for measuring the electrical resistance of flexible, laminate, and modular multilayer flooring. This standard plays a critical role in ensuring flooring safety in environments where static electricity poses a risk, such as hospitals, clean rooms, electronics manufacturing facilities, data centers, and areas containing flammable materials. It helps classify flooring as antistatic, static dissipative, or conductive.

Flexible flooring materials are flexible and durable, returning to their original shape underfoot. Common types include:

• Vinyl (PVC) sheets or tiles
• Linoleum
• Rubber
• Luxury vinyl tiles
• Laminate and modular multilayer systems

These are widely used in homes, offices, and commercial spaces due to their comfort, water resistance, and ease of maintenance.

Static electricity buildup from walking or equipment movement can cause the following:

• Sparks that cause explosions in hazardous areas.
• Damage to sensitive electronic devices.
• Discomfort or electric shock in humans

Soils with controlled resistance distribute loads safely:

• Conductive: Low resistance (maximum 10^6 Ω). Suitable for high-risk ESD areas.
• Distributor: Medium resistance (10^6 to 10^9 Ω). Provides a balance between safety and comfort.
• Antistatic: Higher resistance (at least 10^9 Ω). Prevents charge accumulation.

Typical applications include electrostatic discharge (ESD) protected cleanrooms and operating rooms.

The EN 1081 standard describes three rigorous testing methods performed under controlled conditions (e.g., temperature of 23 degrees plus/minus 2 degrees, relative humidity of 25 percent plus/minus 5 percent):

• Vertical resistance: Measures the resistance along the thickness of the material (from top to bottom).
• Ground resistance: Measured from the ground surface to a grounded point, simulating a real installation.
• Surface resistance: Measured along the top surface of the flooring.

These tests utilize specialized equipment. Results are expressed in ohms (Ω) and must meet project-specific threshold values.

Manufacturers use the EN 1081 standard to certify their products and ensure CE marking where appropriate. Installers verify compliance on-site to avoid liability. Relevant standards include the EN 14041 standard and the IEC 61340 standard for ESD control.

This standard is considered important because it prevents the following risks:

• Fires and explosions in hazardous areas: A static spark can ignite flammable gases, vapors, solvents, or dusts. This risk is particularly high in operating rooms (where anesthetic gases or oxygen-enriched atmospheres may be present), laboratories, pharmaceutical manufacturing facilities, chemical plants, or explosives processing plants.
• Damage to sensitive electronic devices: Electrostatic discharge can destroy or damage microchips and electronic components, leading to hidden defects that can cause sudden or premature failures. This is critical in electronics manufacturing, clean rooms, data centers, server rooms, and medical equipment areas.
• Contamination in clean environments: Charged surfaces attract dust and particles, increasing the risk of contamination in pharmaceutical manufacturing facilities, hospitals, or semiconductor plants, potentially leading to product defects or hospital-acquired infections.
• Personnel safety and comfort: Uncontrolled discharges can cause painful shocks or, in extreme cases, frighten workers, contributing to accidents.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services in accordance with the EN 1081 standard.