ISO 27668-1-2016 pdf free.Gel ink ball pens and refills一Part 1: General use. This part of Iso 27668 establishes minimum quality requirements for gel ink ball pens (refillable and non-refillable) and refills for general use. Additional requirements for gel ink ball pens for documentary use are given in ISO 27668-2. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1O5-A02, Textiles — Tests for colourfastness — Part A02: Grey scale for assessing change in colour ISO 105-B02, Textiles — Tests for colourfastness — Part B02: Colourfastness to artificial light: Xenon arc fading lamp test ISO 534, Paper and board — Determination of thickness, density and specific volume ISO 535, Paper and board — Determination of water absorptiveness — Cobb method ISO 536, Paper and board — Determination ofgrammage ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore hardness) ISO 2144, Paper, board and pulps — Determination of residue (ash) on ignition at 900 degrees C ISO 5627,…