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USP Class Plastic Tests are designed to assess the biological reactivity of various types of plastics materials in vivo. Originally developed to test drug containers, the class plastics tests are often performed on unmolded plastic resins as well as containers. Class plastics testing is not a substitute for biocompatibility testing, but is often used by manufacturers to classify materials.

The USP defines six plastics classes, from I to VI (VI being the most strict). Therefore, many plastics manufacturers find it advantageous to have their plastic resins certified as USP Class VI, especially if the resin is a likely candidate to be used in medical devices. A plastic resin material that has passed Class VI certification is assumed to be more likely to produce favorable biocompatibility results.

There are three in vivo tests involved in the classification of plastics.  The Systemic Injection Test and the Intracutaneous Test are designed to determine the systemic and local biological responses to plastics and other polymers by the single-dose injection of specific extracts prepared from a sample.  The third test, the Implantation Test, is designed to evaluate the reaction of living tissue to a test material. The testing for the six different class plastics levels is all done using different combinations of these three tests and different extracts.

USP Class Plastics Testing Servies

  • USP Systemic Injection Test
  • USP Intracutaneuous Test
  • USP Implantation Test

USP Class Plastics Testing Standards

USP Class Plastics Related Testing

Read More About USP Class Plastics


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