Cap safety for writing pens 

Cap safety for writing pensThere are separate standards/requirements for pen caps and end plugs in writing and markings instruments for children up to 14 years of age for reducing risk to asphyxiation. 
These are detailed below. Expensive and professional pens and refills are excluded. 
BS7272 Part 1 
British Standard for detachable pen caps 
Applies to the pen cap size and airflow 
BS7272 Part 2 
British Standard for pen end closures and plugs 
Applies to size; security, including inaccessibility and minimal protrusion; air flow; and additional safeguards 
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