UL 626:2018 pdf download.Water Fire Extinguishers.
4.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
4.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions， such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.
5 Glossary
5.1 For the purpose of this standard,the following definitions apply.
5.2 ANTIFREEZE CHARGE - A water based extinguishing medium that uses an alkali metal salt as afreezing point depressant.
5.3 DISPOSABLE (NONRECHARGEABLE)FIRE EXTINGUISHER - A fire extinguisher not capable ofnor intended to undergo complete maintenance including internal inspection of cylinder，replacement ofparts and seals and hydrostatic testing.
5.4 EFFECTIVE DISCHARGE - The time of discharge of extinguishing agent from the extinguisheruntill gas point.
5.5 EXPELLANT GAS - A compressed or pressurized gas used to propel the liquid extinguishing agentfrom a single cylinder.
5.6 GALVANIC COMPATIBILITY - Fire extinguisher cylinder and component parts which are notsusceptible to 10-day stress corrosion cracking or corrosion from combination of dissimilar materials.
5.7 GAS POINT -The point in time when the discharge changes from a liquid to a gas and liquidcombination.
5.8 LOADED STREAM CHARGE - A water based extinguishing medium that uses an alkali metal saltas a freezing point depressant.
5.9 PORTABLE FIRE EXTINGUISHER - A fire extinguisher carried or on wheels and operated byhand.
5.10 PRESSURE GAUGE- A gauge that shows the pressure in the cylinder and the operating rangeof the extinguisher based upon the operating temperature-pressure relationship in appropriate pressureunits.
5.11 PRESSURE INDICATOR -An indicator that shows that the extinguisher is pressurized with itsrated expellant gas pressure.
5.12 RECHARGEABLE (REFILLABLE)FIRE EXTINGUISHER - A fire extinguisher capable of undergoing complete maintenance including internal inspection of cylinder, replacement of parts andseals and hydrostatic testing.
