ISO 2878:2017 pdf download

ISO 2878:2017 pdf download.Rubber, vulcanized or thermoplastic — Antistatic and conductive products — Determination of electrical resistance
1 Scope
This document specifies a method of test to determine the electrical resistance of antistatic and conductive products manufactured wholly or in part from rubber whose electrical resistance measured between defined points, when new, does not exceed 3 × 10 8 Ω and whose conductivity is derived from the addition of carbon black and/or other appropriate substances to the bulk of the material. NOTE Highly conductive mixes cannot be made in this way. This document specifies the electrode configuration for basic geometries, but it is intended that reference be made to relevant product specifications for requirements for specific products. It does not apply to: a) products the relevant surfaces of which are composed of mixtures of insulating and conductive areas; b) products with a substantial surface area of insulating material, except for footwear (which does not normally have a conductive or antistatic upper).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 18899:2013, Rubber — Guide to the calibration of test equipment
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Principle
The resistance between two positions on a product is measured, using a defined system of electrodes,by a system suited to factory inspection or service testing.
5 Apparatus and materials
5.1 Test instrument
The test shall be made with an instrument having a nominal open-circuit voltage of 500 V DC, preferably an insulation tester (ohmmeter), or with any suitable instrument known to give comparable results. The instrument shall be sufficiently accurate to determine the resistance within 10 % and shall not dissipate more than 3 W in the product. The resistance values obtained will vary with the applied voltage, and errors can occur when low test voltages are involved. In cases of dispute, the voltage applied to the product shall be not less than 40 V, except where this conflicts with the requirement not to dissipate more than 3 W in the product.