---
kind: "section"
citation: "40 C.F.R. § 1090.1330"
title: "40"
number: "1090.1330"
heading: "Preparing denatured fuel ethanol."
url: "https://uscodex.org/cfr/40/1090.1330"
---

# §1090.1330. Preparing denatured fuel ethanol.


Instead of measuring every batch, a DFE producer or importer may calculate the sulfur content of a batch of DFE as follows:

- (a) Determine the sulfur content of ethanol before adding denaturant by measuring it as specified in [§ 1090.1310](/cfr/40/1090.1310.md) or by estimating it based on your production quality control procedures.
- (b) **Use the ppm sulfur content of certified ethanol denaturant specified on the PTD for the batch.** If the sulfur content is specified as a range, use the maximum specified value.
- (c) Calculate the weighted sulfur content of the DFE using the values determined under paragraphs [(a)](#a) and [(b)](#b) of this section.

## Notes

### Authority

Authority: 42 U.S.C. 7414, 7521, 7522-7525, 7541, 7542, 7543, 7545, 7547, 7550, and 7601.

### Source

Source: 85 FR 78469, Dec. 4, 2020, unless otherwise noted.