TS ISO 11540

TS ISO 11540 addresses the safety features required for caps on writing and marking instruments intended for children up to 14 years of age. Its core concern is the design of the cap as a small part that should reduce the risk associated with accidental swallowing or airway obstruction, helping to define safer cap concepts for pens, markers and similar products used at home or school.

Which product groups are covered

The standard applies to writing and marking instruments designed or clearly intended for use by children up to 14 years old. It explicitly excludes jewelry-type pens, expensive fountain pens and technical drawing pens that are not designed for children or intended for children's use. This distinction matters because cap safety is evaluated in relation to the intended user group and the context of use, not just the instrument format itself.

What cap safety means in practice

In general technical terms, cap safety is about more than whether a cap fits a pen. Shape, size and the way a cap is intended to function all influence the hazard profile, especially if a child places it in the mouth. Standards in this area provide a structured way to think about reducing foreseeable risks in everyday writing products. Although this edition of TS ISO 11540 has been withdrawn, it remains a clear reference point for child-focused cap safety in writing and marking instruments.