# Elemental Mercury Used in Barometers, Manometers, Hygrometers, and Psychrometers; Significant New Use Rule
> **Rule** · Final rule. · Published 2012-05-30 · Effective 2012-06-29 · 77 FR 31728
## Document
- **Document number:** 2012-13071
- **Category:** chemical-tsca
- **Federal Register citation:** 77 FR 31728
- **CFR reference:** 40 CFR 721
- **Publication date:** 2012-05-30
- **Effective date:** 2012-06-29
- **EPA docket:** EPA-HQ-OPPT-2010-0630
## Abstract

EPA is promulgating a significant new use rule (SNUR) under the Toxic Substances Control Act (TSCA) for elemental mercury use in barometers, manometers, hygrometers, and psychrometers. This action will require persons who intend to manufacture (including import) or process elemental mercury for an activity that is designated as a significant new use by this final rule to notify EPA at least 90 days before commencing that activity. The required notification will provide EPA with the opportunity to evaluate the intended use and, if necessary, to prohibit or limit that activity before it occurs.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/05/30/2012-13071/elemental-mercury-used-in-barometers-manometers-hygrometers-and-psychrometers-significant-new-use)
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