Back درجة حرارة الاشتعال الذاتي Arabic Temperatura d'autoignición AST Temperatura d'autoignició Catalan Teplota vznícení Czech Zündtemperatur German Σημείο αυτανάφλεξης Greek Memsparka temperaturo Esperanto Temperatura de autoignición Spanish دمای خودآتشگیری Persian Itsesyttymislämpötila Finnish
The autoignition temperature (often called self-ignition temperature, spontaneous ignition temperature, minimum ignition temperature, or shortly ignition temperature, formerly also known as kindling point) of a substance is the lowest temperature at which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark.[1] This temperature is required to supply the activation energy needed for combustion. The temperature at which a chemical ignites decreases as the pressure is decreased.[2]
Substances which spontaneously ignite in a normal atmosphere at naturally ambient temperatures are termed pyrophoric.
Autoignition temperatures of liquid chemicals are typically measured using a 500-millilitre (18 imp fl oz; 17 US fl oz) flask placed in a temperature-controlled oven in accordance with the procedure described in ASTM E659.[3]
When measured for plastics, autoignition temperature can also be measured under elevated pressure and at 100% oxygen concentration. The resulting value is used as a predictor of viability for high-oxygen service. The main testing standard for this is ASTM G72.[4]
- ^ Cite error: The named reference
LAURENDEAUwas invoked but never defined (see the help page). - ^ Lin, Guanyou (29 March 2023). "Auto-Ignition Temperature: Understanding the Science behind Spontaneous Combustion". To Chemistry Journal. 10 (1): 1.
- ^ E659 – 78 (Reapproved 2000), "Standard Test Method for Autoignition Temperature of Liquid Chemicals", ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.
- ^ S. Grynko, "Material Properties Explained" (2012), ISBN 1-4700-7991-7, p. 46.