How to distinguish between PVC material and PE material shrink film

1, shaking method: pick up the PE shrink film in the hands of shaking, loud, clattering sound for the PVC heat shrink film, while the sound is brittle, the quality of easy to float is PE shrink film;

2, touch method: PVC material shrink film feel hard, PE shrink film feel more lubrication;

3, immersion method: the shrink film immersed in water, press the hand into the water, can float out of the water for the PE shrink film, sinking to the bottom of the water for the PVC heat shrink film, (PE density is less than the water, the density of PVC is greater than the water, respectively, at room temperature for about 0.92g/cm3 and 1.4g/cm3).

4, combustion method: fire is not easy to burn, away from the fire that is extinguished, the flame is green PVC shrink film, flammable, the flame is yellow, burning paraffin-like oil drops, and there are candles burning gas is PE shrink film; you can also take a copper wire, burned in the fire into red, and then, will be a copper wire with the test contraction film contact, resulting in a chemical change, and then dipped in the plastic composition of the copper wire back to the then put the copper wire dipped in the plastic component back into the flame. At this time, you need to carefully observe, if there is a colorful, dazzling green flame, it means that the plastic material contains chlorine, belonging to the PVC heat shrinkable film.