UNE EN 1149-1 Electrostatic properties. Surface resistivity (test methods and requirements)
This test method is not applicable to fabrics with conductive fiber core.
Inhomogeneous material: material which contains small amounts of threads distributed in a network, or material coated or laminated with polymeric or metallic materials and the properties of electricity were substantially different material components (eg more than one factor of 10) of each other
Test method: the sample is placed on an insulating base plate, then place the group of electrodes on the sample, apply a continuous stream and measure the resistance of the sample
Requirements: the surface resistivity must be less than 5 · 1010 Ω
The inhomogeneous material must have a conductive yarn net and the maximum distance between this conductive threads must be of 10 mm.
This standard does not apply to specify the protection against electrical stresses
The electrodes are placed on opposite surfaces of the test material. Apply a DC voltage to the electrodes and determining the electrical resistance of the tested material
UNE EN 1149-3 Electrostatic properties. Test methods for measurement of charge decay
Charging by induction: the burden of the test sample is performed by inductive effect. Immediately below the test sample, which remains horizontal and no contact with it, an electrode is placed in the field. The field electrode is subjected to high voltage abruptly. If the sample is conductive or contain conductive elements is induced on it a charge opposite to the field electrode. Electrode field incident on the conductive elements does not cross the sample and the resulting field is reduced in a manner that is characteristic of the material tested. This effect is measured and recorded by behind of the sample with a probe of appropriate action.
EN 1149-5 Electrostatic properties. Material performance and design requirements
- surface resistance equal to or less than 2.5 x 109 Ω in at least one of the surfaces tested according to the norm EN 1149-1