The chief advantage of zinc phosphate cement is its:
Film thickness
The smaller the particle size, less is the film thickness. The thickness is lesser than the size of the particles because, during mixing the particles are crushed and dissolved. The thickness can also be reduced by applying pressure on the casting during seating.
This is the chief advantage of zinc phosphate.
Ref- Manapallil 3rd ED P:92
Good compressive strength
Film thickness
Lack of irritation
Low solubility