1. Viscous, is stretched film in stretched or unstretched state, the existence of adhesion between the two films, this feature allows it to the time of the package, can be tightly wrapped and wrapped together, do not need Strapping or heat-sealing, energy-saving energy and materials, however, it should be placed in a clean place, so as not to stick dust.

2. Elastic recovery, refers to the stretch film in a certain proportion of stretching, to maintain this state for some time, after the release to restore the size of the ratio of the original size. If its ratio is relatively small, indicating that its elastic recovery is better so that it is better on the stretch, not easily deformed.

3. Permanent deformation refers to stretch the stretch film to a certain ratio, the length of the growth and the ratio of the original length. If the length of growth is relatively large, indicating that its elastic recovery is relatively poor, easy to deformation.

4. Pull to maintain, when the stretch film stretch a certain percentage, to maintain this state for a certain time, the ratio of tensile force and F force value is the tension to maintain, F force is the stretch film stretch at a predetermined maximum elongation Force, through the tension to maintain this indicator, you can see the stretch film tensile strength.

5. Anti-piercing, through the process of piercing the rupture of the film when the force value and the displacement through the time that can reflect the stretch film puncture resistance, high-quality stretch film should have good puncture resistance, So as to ensure the safety of packaging.

6, light transmittance, haze, stretch film in the use of the time required to have a higher degree of transparency can be detected by light transmittance and haze.

Analysis of Physical Index of Stretch Films