### Question
What is the definition of category of mixtures?


### Answer
The definition of **category of mixtures** is as follows in *15 U.S.C. § 2625*:

> a group of mixtures the members of which are similar in molecular structure, in physical, chemical, or biological properties, in use, or in the mode of entrance into the human body or into the environment, or the members of which are in some other way suitable for classification as such for purposes of this chapter

#### Citation:
  - *15 U.S.C. § 2625*
  - Heading: **CHAPTER 53-TOXIC SUBSTANCES CONTROL > SUBCHAPTER I-CONTROL OF TOXIC SUBSTANCES**

