Polyfvinyl chloride lubricants

Plasticizers—small organic molecules that act as lubricants between chains—eire usually added to thermoplastics to keep them from becoming brittle at room temperature. A good example is polyfvinyl chloride), which is brittle when pure but becomes supple and pliable when a plasticizer is added. In fact, the drip bags used in hospitals to deliver intravenous solutions are made of polyfvinyl chloride). Dialkyl phthalates such as di(2-ethyl-hexyl) phthalate are commonly used for this purpose, although questions about their safety have recently been raised. 

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