This standard specifies the classification, requirements, test methods, inspection rules and marking, packaging, transportation and storage of microporous pen tips. This standard applies to extruded pen tips made of polyformaldehyde and other materials. This standard does not apply to plastic-coated pen tips.
GB/T 191 Packaging.Pictorial marking for handling of goods
GB/T 2828.1 Inspection procedure by count sampling part 1: Lot by lot inspection sampling plan retrieved by acceptance quality limit (AQL)*, 2013-02-15 Update