A compound is defined as a substance formed when two or more elements are chemically bonded together. But how does PVC resin transform to vinyl compound? 

New compound formulations are developed to meet an application requirement or a processing limitation. Chemists and formulation engineers create custom compounds by blending a variety of additives, modifiers and stabilizers with PVC resin to achieve specific properties.

The difference between rigid and flexible PVC compounds, in a word is – plasticizer.

Rigid PVC compounds sometimes listed as rPVC or uPVC (unplasticized) – have high hardness, excellent mechanical properties, and high melt point. These work well in some applications, such as deck and rail or for pipe fittings, but there are other applications that call for a less rigid, more malleable material.

Flexible PVC compounds are formulated to meet performance requirements for applications such as medical tubing, electrical wiring, automotive body side molding, and garden hose just to mention a few. They are also formulated with our customer’s processability needs in mind. Flexible PVC compounds contain plasticizers, softening agents which help give them “rubber like” properties.  

Market needs, scientific advancements, regulatory guidelines and raw material economics compel R&D technicians and formulation engineers to push the envelope, looking for more versatile and cost-effective materials to use in their custom compound formulations. Due to their inherent versatility, vinyl compounds have proven to be very cost-effective materials across many markets and applications.

Below is a generalized list of the ingredients used in the formulation of vinyl compounds.

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