PVC is produced in two general forms: rigid PVC and flexible PVC, rigid PVC is twice flexible PVC of market

Generally, PVC can be divided into soft PVC and rigid PVC. The rigid PVC for about two-thirds of the market, soft PVC accounted for a third. Soft PVC have plasticizers, such as phthalates, adipates, and phosphate, while rigid PVC contains little or no plasticizer.

Soft PVC is used for floor, ceiling and leather surface, although soft PVC can be made to be resistant to chemical and liquid damage, is not easy to preserve, it has less utility. Rigid PVC features good suppleness, easy molding, can be preserve for long, non-toxic, it can be used for broad application. The essence of the PVC is a kind of vacuum suction Plastic Film, used in the various types of panel surface Packaging, so they are called PVC Decoration film, with film, used in building materials, packaging, medicine, and many other industries.

The building materials industry accounted for the largest proportion, at 60%, followed by packaging industry, and many other small range application industry. Polyvinyl chloride (PVC) molecules containing chlorine atom. It is a kind of polarity strong material. PVC has the very good acid and alkali resistance, wear resistance, fire resistance and insulation performance, but light, heat stability is poor.

There are four methods for preparation of PVC: suspension method, ontology method, emulsion method and solution method. The most common suspension method, most applications of PVC resin is this kind of resin. The product contains according to the amount of plasticizer (typically dibutyl phthalate, dioctyl phthalate) is divided into hard, half hard and soft three kinds of materials. Rigid PVC including plasticizer for 10-25%, half hard PVC for 30 ~ 40%, soft PVC for forty to 70%. All PVC products must contain a certain amount of stabilizing agent, in order to avoid degradation occurred in machining process. Soft PVC products of the plasticizer is to make polymer become soft. Plasticizer choice or plasticizer of combination, and finally the finished expected performance to decide. Most of the plasticizer to some extent also plays the role of processing aid. Plasticizer reduced resin melt temperature and viscosity, which can prevent resin adhesive to processing equipment on the metal parts. Some products need impact modifier to improve durability and toughness. In generally, different types of PVC require different impact modification additives to achieve the right performance goals. The flexible pvc will be improved durable strength and property retention, the rigid pvc will be enhanced filler compatibility and lower processing temperature etc.