40 CFR § 792.135 - Physical and chemical characterization studies.

---
identifier: "/us/cfr/t40/s792.135"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 792.135 - Physical and chemical characterization studies."
title_number: 40
title_name: "Protection of Environment"
section_number: "792.135"
section_name: "Physical and chemical characterization studies."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "R"
subchapter_name: "TOXIC SUBSTANCES CONTROL ACT"
part_number: "792"
part_name: "GOOD LABORATORY PRACTICE STANDARDS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 2603."
regulatory_source: "54 FR 34043, Aug. 17, 1989, unless otherwise noted."
cfr_part: "792"
---


# 792.135 Physical and chemical characterization studies.

(a) All provisions of the GLPs shall apply to physical and chemical characterization studies designed to determine stability, solubility, octanol water partition coefficient, volatility, and persistence (such as biodegradation, photodegradation, and chemical degradation studies).

(b) The following GLP standards shall not apply to studies designed to determine physical and chemical characteristics of a test, control, or reference substance:

Section 792.31 (c), (d), and (g)

Section 792.35 (b) and (c)

Section 792.43

Section 792.45

Section 792.47

Section 792.49

Section 792.81(b) (1), (2), (6) through (9), and (12)

Section 792.90

Section 792.105 (a) through (d)

Section 792.113

Section 792.120(a) (5) through (12), and (15)

Section 792.185(a) (5) through (8), (10), (12), and (14)

Section 792.195 (c) and (d)