---
kind: "section"
citation: "40 C.F.R. § 355.16"
title: "40"
number: "355.16"
heading: "How do I determine the quantity of extremely hazardous substances present for certain forms of solids?"
url: "https://uscodex.org/cfr/40/355.16"
---

# §355.16. How do I determine the quantity of extremely hazardous substances present for certain forms of solids?


For the three forms of solids that are listed in [§ 355.15(a)(1) through (3)](/cfr/40/355.15.md?p=a-1..a-3), use these instructions to determine the quantity of extremely hazardous substance present:

- (a) **Solid in powdered form with a particle size less than 100 microns.** Multiply the weight percent of solid with a particle size less than 100 microns in a particular container by the total weight of solid in the container.
- (b) **Solid in solution.** Multiply the weight percent of the non-reactive solid in solution in a particular container by the total weight of solution in that container. Then multiply by 0.2.
- (c) **Solid in molten form.** Multiply the weight of the non-reactive solid in molten form by 0.3.

## Notes

### Amendments

[73 FR 65462, Nov. 3, 2008, as amended at 77 FR 16688, Mar. 22, 2012]

### Authority

Authority: Sections 302, 303, 304, 325, 327, 328, and 329 of the Emergency Planning and Community Right-to-Know Act of 1986 (EPCRA) (42 U.S.C. 11002, 11003, 11004, 11045, 11047, 11048, and 11049).

### Source

Source: 73 FR 65462, Nov. 3, 2008, unless otherwise noted.

### Amendments

[73 FR 65462, Nov. 3, 2008, as amended at 77 FR 16688, Mar. 22, 2012]