---
kind: "section"
citation: "40 C.F.R. § 63.2993"
title: "40"
number: "63.2993"
heading: "What test methods must I use in conducting performance tests?"
url: "https://uscodex.org/cfr/40/63.2993"
---

# §63.2993. What test methods must I use in conducting performance tests?

- (a) Use EPA Method 1 ([40 CFR part 60](/cfr/40/part60.md), appendix A-1) for selecting the sampling port location and the number of sampling ports.
- (b) Use EPA Method 2 ([40 CFR part 60](/cfr/40/part60.md), appendix A-1) for measuring the volumetric flow rate of the stack gas.
- (c) Use EPA Method 3 or 3A ([40 CFR part 60](/cfr/40/part60.md), appendix A-2) for measuring oxygen and carbon dioxide concentrations needed to correct formaldehyde concentration measurements to a standard basis.
- (d) **Use EPA Method 4 (40 CFR part 60, appendix A-3) for measuring the moisture content of the stack gas.**
- (e) Use EPA Method 316, 318, or 320 ([40 CFR part 63](/cfr/40/part63.md), appendix A) for measuring the concentration of formaldehyde.
- (f) Use the method contained in appendix A to this subpart or the resin purchase specification and the vendor specification sheet for each resin lot for determining the free-formaldehyde content in the urea-formaldehyde resin.
- (g) **Use the method in appendix B to this subpart for determining product loss-on-ignition.**

## Notes

### Amendments

[84 FR 6694, Feb. 28, 2019]

### Source

Source: 67 FR 17835, Apr. 11, 2002, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.

### Amendments

[84 FR 6694, Feb. 28, 2019]