What happens to wax on the nozzle tips of FREON PDIs?

The melting point of wax on the nozzle tips of FREON PDIs (Propellant-Driven Inhalers) is critical for the effective functioning of the device. When the wax melts at 78°, it allows for the proper release of the medication contained within the inhaler. This melting point is designed to ensure that the wax only liquefies under specific temperature conditions, facilitating the correct operation of the nozzle tips and ensuring that the medication can be vaporized and delivered effectively when the inhaler is used.

Understanding the melting temperature is essential for anticipating the performance of the FREON PDIs during different environmental conditions and ensuring that users can rely on the device for proper medication delivery when needed. The other options do not accurately capture the specified melting point, highlighting the importance of knowing this precise threshold for the effective operation of these inhalers.