PVC conventional identification methods are generally grouped into the following three categories, namely: identification (1) combustion method: softening or melting temperature range: 75 ~ 90 ° C; combustion conditions: self-extinguishing after ignition; combustion flame Status: under yellow green smoke ; away from the fire situation: from the fire goes out; Odor: pungent smell. This method is the most convenient and direct, generally the first choice. (2) solvent treatment Identification: Solvent: tetrahydrofuran, cyclohexanone PVC shaped pipe, ketone PVC profiled plastic pipe, dimethylformamide; non-solvent: methanol PVC shaped pipe manufacturers, acetone, heptane. Suspected by the above solvent is added PVC plastic PVC pipe shaped product, dissolution was observed to determine whether the plastic is PVC. After the solvent is heated to dissolve the effect will be more pronounced. (3) the proportion method: PVC specific gravity of 1.35 to 1.45, usually about 1.38. By gravity method for determining the proportion of the difference or distinction between PVC and other plastics. PVC by adding plasticizers, modifiers, and fillers, so that PVC becomes large difference in specific gravity, hardness vary widely, but also due to the addition of some ingredients, many properties of PVC plastic is changed, so that we used The identification method is not obvious, even the phenomenon of change, can not make accurate judgments. For example: density, plasticized polyvinyl chloride (containing about 40% plasticizer) is 1.19 to 1.35; and rigid PVC products has increased to 1.38 to 1.50. If you are highly filled PVC products, density and sometimes more than two. Shaped PVC pipe manufacturers _PVC shaped pipe _ sea Widex Widex provided by Qingdao Rubber Material Co., Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) strong, credible, in Qingdao, Shandong industrial products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the sea Widex and you work into the brilliant, for a better future!