Both LDPE and LLDPE have excellent rheology or melt fluidity. LLDPE has less shear sensitivity because of its narrow molecular weight distribution and short branched chains. LLDPE maintains a higher viscosity during shearing, so it is more difficult to process than LDPE with the same melt index. In extrusion, the lower shear sensitivity of LLDPE makes the stress relaxation of polymer molecular chain faster, and thus the sensitivity of physical properties to the change of blow up ratio decreases. In melt elongation, LLDPE usually has lower viscosity at various strain rates. That is to say, it will not produce strain hardening in tension like LDPE.

Linear low density polyethylene is non-toxic, tasteless and odorless milky white particles with a density of 0.918~0.935g/cm3. Compared with LDPE, it has higher softening temperature and melting temperature, high strength, good toughness, high rigidity, good heat resistance, cold resistance and other advantages, as well as good resistance to environmental stress cracking, impact strength, tear strength and other properties, and can withstand acid, alkali, organic solvents and so on, and is widely used in industry, agriculture, medicine, health and daily necessities and other fields.