Material requirements
A material intended to dissipate electrostatic charges must meet at least one of the following requirements:
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t50% < 4 s or S > 0.2, verified according to test method 2 (induction charging) specified in EN 1149-3.
or else
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a surface resistance less than or equal to 2.5 x 109 Ω, verified according to EN 1149-1, on at least one surface.
For a material containing grids or stripes of conductive threads the spacing between conductive threads in one direction must not exceed 10 mm.
Material requirements (standard EN 1149:1995)
For homogeneous materials the surface resistivity after testing must be less than 5 x 1010 Ω
For inhomogeneous materials which are coated or laminated, at least one surface must comply with the requirement for homogeneous materials.
Inhomogeneous materials containing conducting threads must have:
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a) at least one surface with no resistances measured to be greater than 109 Ω;
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b) a grid pattern of conductive fibres;
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c) a maximum spacing of 10 mm between conductive fibres
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