BS7272 mainly tests the ventilation volume of pens, focusing on two parts: the pen cap and the pen tail. The part exposed outside the 16 - mm - diameter test ring should be no shorter than 5 mm. Under a pressure difference of 1.33 KPA, there should be a ventilation volume of at least 81 L/min in both directions.
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Definitions
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Brief Introduction to the Testing Content of BS7272
Parts 1 and 2 of BS7272 set safety requirements for writing and marking instruments used by children under 14 years old under normal or possible circumstances. When children put pen caps in their mouths to play with, they may accidentally inhale the end caps or pen caps. The inhaled parts may get stuck below the throat, blocking the trachea. The provisions of the above - mentioned regulations minimize the risk by reducing the likelihood of inhaling pen caps and end caps and can delay suffocation until medical treatment is available. The last update of this standard was in 2000. The following are some of the main changes compared with the current BS7272 standard.
BS 7272 - 1:2008Clauses and Definitions
"When not in use" was added to the definition: Pen cap - "A detachable pen cap is designed to cover the nib when not in use."
Requirements
For the ventilation area of ventilated pen caps, instead of measuring the continuous airway, it is changed to design - guiding instructions. The remaining options to be complied with are pen cap size and air flow.BS 7272-2008+A1:2014Requirements
Additional requirements were added. When the end cap is cap - shaped, just covers the pen barrel (non - insert type), and its length exceeds its diameter, or the end cap is fixed by threads but does not meet the "size" requirement or the "non - accessible" requirement, the end cap should meet the "safety" and "air flow" requirements.