EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 1853 testing. This standard specifies requirements for laboratory testing of the volume resistivity of specially prepared test pieces of vulcanized or thermoplastic rubber compounds made conductive or emissive by the addition of carbon black or ionizable materials.
The tests are suitable for materials with a resistivity of less than about 10 8 Ω⋅m.
Rubber is normally considered a material with high electrical resistance; As a result, it is widely used as an insulator. However, the inclusion of various materials, especially certain forms of carbon black, greatly reduces the electrical resistance, so that volume resistances between 1013 Ωm and 0,01 Ωm can be achieved.
There are various technical and industrial purposes for which reduced resistivity rubber is a useful material, the most common application being the dissipation of static charges. In certain cases, a lower resistance limit is specified on a product with this last application as a safety precaution to prevent ignition or serious shock to a person in contact, in case of faulty insulation or nearby electrical equipment.
Products that do not meet safety requirements are called "conductive" rubber. Given the dimensions of the product, it is not possible to define a suitable range of volume resistivity for any of these classes, only to define a range of resistance values between defined points. However, conductive materials are generally considered to have a resistivity below 106 Ωm, and dissipative materials have a resistivity between 105 Ωm and 1010 Ωm.
Apart from static electricity, the main danger in most buildings and most electrical equipment is leakage currents from the normal voltage supply network. To guard against these hazards, it is recommended that the lower resistance limit for an energy consuming rubber product be 5 250 Ω for a 5 V mains supply with a maximum current of 104 mA. The limit may be proportionally less for lower voltages.
The maximum resistance that will allow static charges to dissipate depends on the rate of charge generation required to produce the minimum voltage that can be considered a hazard in a given application.
The resistance of rubbers and plastics made conductive by the addition of carbon black is very sensitive to stress and temperature history because the resistance depends on the structural configuration of the carbon particles in the matrix.
EUROLAB assists manufacturers with ISO 1853 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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