Lite home packaging products company will teach you how to identify polyvinyl chloride (PVC)

VC conventional identification methods generally summarized as the following three categories, namely:
(1) combustion method to identify:
Soften or melt temperature range: 75 ~ 90 ° C;
After combustion situation: ignite self-extinguishing;
Under the burning flame state: yellow green smoke; Situation: after away from the fire from the fire goes out; Bouquet: irritating sour.
This method is the most simple and direct, generally in the first place.
(2) solvent processing identification:
Solvent: tetrahydrofuran, cyclohexanone, ketone, dimethyl formamide;
Non solvent, methanol, acetone and heptane.
By adding suspected PVC plastic above solvents, observe the situation to determine the dissolution of the plastic is PVC. Solvent after heating, dissolving the effect will be more obvious.
(3) the proportion of law:
The proportion of PVC is 1.35 ~ 1.45, usually around 1.38.
Can measure the proportion by weight difference or the method of distinguish between PVC and other plastic.
But because the PVC can pass to add plasticizer, modifier and filler, make PVC weight difference is very big, hard and soft difference is very big, also because of the addition of some ingredients, which changes a lot of properties of PVC plastic, resulted in a common method to identify the effect is not obvious, we even phenomenon change, unable to make an accurate judgment. Such as density, plasticizing PVC plasticizer (containing about 40%) was 1.19 ~ 1.35; And the rigid PVC products is up to 1.38 ~ 1.50. If it is a highly filled PVC products, density, sometimes more than 2.