46 CFR § 30.10-27 - Flashpoint—tb/all.

---
identifier: "/us/cfr/t46/s30.10-27"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 30.10-27 - Flashpoint—TB/ALL."
title_number: 46
title_name: "Shipping"
section_number: "30.10-27"
section_name: "Flashpoint—TB/ALL."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "D"
subchapter_name: "TANK VESSELS"
part_number: "30"
part_name: "GENERAL PROVISIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 2103, 3306, 3703; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGFR 65-50, 30 FR 16657, Dec. 30, 1965, unless otherwise noted."
cfr_part: "30"
---


# 30.10-27 Flashpoint—TB/ALL.

The term *flashpoint* indicates the temperature in degrees Fahrenheit at which a liquid gives off a flammable vapor when heated in an open-cup tester. For the purpose of the regulations in this subchapter, flashpoints determined by other testing methods will be equivalent to those determined with an open-cup tester, as follows:

Table 30.10-27—Equivalent Flashpoints

[In degrees Fahrenheit]

| Open-cup tester | Tag closed-cup tester (A.S.T.M.) | Pensky-Martens closed tester (A.S.T.M.) |
| --- | --- | --- |
| 80 | 75 |  |
| 150 |  | 140 |

[CGFR 65-50, 30 FR 16657, Dec. 30, 1965, as amended by USCG-2014-0688, 79 FR 58279, Sept. 29, 2014]