European Standard · Protective Clothing
EN 1149 – Electrostatic Properties of Protective Clothing
EN 1149 is a series of European standards specifying test methods and requirements for the electrostatic properties of protective clothing, used to prevent dangerous electrostatic discharge in environments with flammable atmospheres or sensitive electronic equipment.
1. Scope
EN 1149 covers garments designed to dissipate electrostatic charge safely, reducing the risk of spark discharge that could ignite flammable gases, vapours or dust. Different parts of the standard cover surface resistivity (EN 1149-1) and charge decay (EN 1149-3) test methods.
2. Exclusions & Related Standards
- Often combined with flame-resistant clothing under EN ISO 11612 in petrochemical and explosive atmosphere environments.
- Relevant alongside ATEX equipment requirements in explosive atmosphere workplaces.
- Built on the general clothing requirements of EN ISO 13688.
3. Key Requirements & Marking
Garments must meet surface resistivity or charge decay limits specified in the relevant part of the standard, and must be marked with the EN 1149 designation. Anti-static garments must always be properly earthed through footwear or flooring to be fully effective – the clothing alone does not guarantee complete protection.
4. Testing Overview
Testing includes surface resistivity measurement across the garment fabric and charge decay time testing, where a charge is applied to the fabric and the time taken to dissipate is measured under controlled humidity and temperature conditions.
5. Selection Guide
Anti-static clothing is essential in explosive atmospheres (ATEX zones), petrochemical facilities, and cleanrooms or electronics manufacturing where static discharge could damage sensitive components. Always pair anti-static garments with appropriately conductive or dissipative footwear and flooring.
6. Inspection, Care and Maintenance
- Wash according to manufacturer instructions, as some anti-static treatments can degrade with incorrect laundering or softener use
- Never wear insulating garments (such as a non-conductive jacket) over anti-static clothing in hazardous atmospheres
- Ensure footwear and flooring maintain a conductive or dissipative path to earth
- Replace garments once anti-static performance can no longer be verified or fabric is damaged
7. Frequently Asked Questions
Does anti-static clothing work without conductive footwear?
No, anti-static clothing relies on a complete path to earth, so conductive or dissipative footwear and flooring are essential for the system to function correctly.
What environments require EN 1149 clothing?
Explosive atmospheres such as petrochemical plants, grain handling facilities, and areas with flammable dust or gas, as well as electronics manufacturing where static discharge could damage components.
Can normal clothing be worn over EN 1149 garments?
No, wearing insulating garments over anti-static clothing can trap and build up charge, defeating the purpose of the anti-static layer.
Does washing affect anti-static performance?
Yes, incorrect washing, especially using fabric softeners, can degrade the anti-static properties of the fabric over time.
Is EN 1149 the same as flame-resistant clothing?
No, EN 1149 addresses electrostatic dissipation only; flame resistance requires separately certified clothing such as EN ISO 11612, though the two are often combined in a single garment.