Static Electricity

EN 1149-5

EN 1149-5: 2008 – This European Standard specifies material and design requirements for electrostatic dissipative clothing, used as part of a total earthed system, to avoid incendiary discharges. The requirements may not be sufficient in oxygen enriched flammable atmospheres. This European Standard is not applicable for protection against mains voltages.

Test methods of EN 1149-5: 
There are 2 different test methods in EN 1149-5. These are EN 1149-1 and EN 1149-3.

EN 1149-1
, test method for measurement of surface resistivity.  
The specimen is placed on an insulating base plate and an electrode assembly is rested on the specimen. A Direct Current (DC) potential is applied to the electrode assembly and the resistance of the fabric is measured. This test determines the resistance over a short distance and is most appropriate for materials for which the electrostatic behavior is based on surface conductivity.  

EN 1149-3
, test method for measurement of charge decay,  
The dissipation of electrostatic charge from the surface of materials for garments. A specimen is charged by an induction effect. The induced charge on the test material influence the net field that is observed by a field-measuring probe, positioned above the test surface. The decrease in field is used to determine the half decay time and the shielding factor. This test method is applicable for homogeneous and non homogeneous materials.

Physicial requirements
Dimensional change due to cleaning ISO 5077 Max 3%
Tensile strenght ISO 13934-1 300N
Tear strenght ISO 13937-1 15N


Test Method Requirement
Electrostatic requirements
Materials with conduction threats in stripe or grid pattern, the maximum space shall not exceed 10 mm in one direction
Surface resistance EN 1149-1 < 2.5 x 109 Ω
Induction Charging EN 1149-3-2
  • Half decay time  < 4 s
  • Shielding factor > 0.2
TenCate Protective Fabrics - Industrial Safety