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ISO 11540:1993 Caps for writing and marking instruments intended for use by children up to 14 years of age -- Safety requirements
standard by International Organization for Standardization, 09/01/1993
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Full Description
Specifies safety requirements for cap size, ventilated caps (vent area, air flow) and marking. Annex A describes the test for air flow. Caps which do not comply should have the instrument or its packaging labelled with a warning as to the dangers of asphyxiation from pen caps.