"In accordance with Section 21.305(d) of the FAR, the FAA accepts handheld extinguishers approved by Underwriters Laboratories..." Also, in accordance with Section 25.851 (601(b1) "An approved type fire extinguisher includes those approved by the Underwriter's Laboratories, Inc., Factory Mutual, Underwriter's Laboratories of Canada..."
"Non-refillable disposable fire extinguishers (1211-1301) are exempt from the periodic hydrostatic test requirements."
John