The addition of the solid fraction (particles of the order of magnitude nm-μm) cangreatly alter physical properties of liquid, such as color, density, viscosity or even its visco-elastic behavior (Newtonian, shear-thinning, shear-thickening). Such mixtures of particles (internal phase or solid fraction) with a solvent (external phase) are known as suspension. Information on the physical properties and behavior of the suspensions can be very useful during manufacturing and QC procedures. That is the reason why this article tells about main parameters of suspensions such as: particle concentration (solid fraction); types of crystal system (cubic, body-centered cubic, hexagonal close-packed, face-centered cubic) and its maximum occupied volume; particle size and particle size distribution; shape of particles (spherical, elliptic, irregular); surface charge of particles (zeta-potential) and about physical phenomena and processes that can be observed in suspensions. Here you can read about viscosity variable, which arises due to the addition of particles to the liquid and here you can find the equations to evaluate this change; the shear-thinning and shear-thickening behavior of the mixture, that is determined by size and shape of the particles; how particles surface charge(zeta potential) can influence viscosity and the general physical behavior of the suspension. The rheological behavior of the suspension (particle size distribution, zeta potential and solid fraction) can be described by such optical methods as: dynamic light scattering, laser diffraction, high resolution images and electrophoretic light scattering. After conclusions one can find contacts of our company.