What does meltblown salt medium mean?

Meltblown salt medium refers to the medium whose core material is a compound composed of metal ions (including ammonium ions) and acid ions. Melt-blown cloth is the core material of the mask, mainly made of polypropylene, and the fiber diameter can reach 1 ~ 5 microns. Properties of compounds composed of metal ions (including ammonium ions) and acid radical ions. Medium, a substance or space that acts as a medium when a physical quantity or a physical phenomenon occurs. Therefore, melt-blown salt medium refers to a medium whose core substance is a compound composed of metal ions (including ammonium ions) and acid ions.