EN 1149-5:2008

PROTECTIVE CLOTHING - ELECTROSTATIC PROPERTIES - PART 5: MATERIAL PERFORMANCE AND DESIGN REQUIREMENTS

This European Standard specifies material and design requirements for electrostatic dissipative protective 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.
This European Standard is part of a series of standards for test methods and requirements for electrostatic properties of protective clothing. Different parts are necessary, because of the various fields of application and materials.

EN 1149 consists of the following parts;

• Part 1: Test method for measurement of surface resistivity;
• Part 2: Test method for measurement of the electrical resistance through a material
  (vertical resistance);
• Part 3: Test methods for measurement of charge decay;
• Part 5: Material performance and design requirements.

Design requirements (part 5)

• Electrostatic dissipative protective clothing shall be able to permanently cover all non-complying materials during normal use (inclusive bending and movements). If the electrostatic dissipative protective clothing comprises multiple layers, e.g. liner, insulation, outer, the outermost material shall meet the material requirements;
• Electrostatic dissipative protective clothing shall provide proper fitting with sizing according to EN 340 and allow full body movement with all closures fastened according to manufacturer’s instructions;
• Thin non-dissipative attachments, such as labels, reflective stripes, shall be permanently attached. This shall be done in such a way that separation between the attached elements and the clothing material is avoided;
• Conductive parts (zippers, buttons etc.) are permitted provided they are fully covered by the outermost material when in use.

An electrostatic dissipative material shall meet at least one of the following requirements:
1. t50 < 4 of S > 0,2 tested according to EN 1149-3:2004 (induction charging);
2. surface resistance ≤ 2,5 x 109 Ω on at least one surface according to EN 1149-1

For a material containing conductive threads in a stripe or grid pattern the spacing of the conductive threads in one direction shall not exceed 10 mm in any part of the garment.