Electrostatic dissipative protective clothing
EN 1149-5 sets material and design requirements for clothing that helps prevent incendiary electrostatic discharges as part of an earthed system.
Measures surface resistance or induction charge decay after cleaning.
At least one criterion must be met.
| Measured property | EN 1149-5:2018 criterion |
|---|---|
| Surface resistance — geometric mean | ≤ 2.5 × 10⁹ Ω on at least one surface |
| Half-decay time t50 — geometric mean | < 4 s, EN 1149-3 Method 2 |
| Shielding factor S — arithmetic mean | > 0.2, EN 1149-3 Method 2 |
Measures the spacing of conductive fibers in stripe or grid patterns.
Maximum spacing: 10 mm in at least one direction throughout the material.
Checks the garment as part of an earthed system.
Resistance to earth < 10⁸ Ω. Coverage of non-dissipative materials during normal movement.
Checks dissipative performance after the declared cleaning procedure.
5 wash-and-dry cycles if no count is declared. Non-cleanable, single-use garments are tested new.
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