ISO 20823:2003规定了一种试验方法，以确定流体在固定温度下与铁水表面接触时的相对可燃性，但也可以通过调节歧管温度来测量流体点火温度。 它主要用于评估耐火液压油的点火阻力，根据定义，耐火液压油难以点火。 它可以在较低的表面温度下与其他类型的易燃液体一起使用，但这可能会显著增加该程序的危险。

ISO 20823:2003 specifies a test method to determine the relative flammability of fluids when contacted with a hot metal surface at a fixed temperature, but it is also possible to gauge fluid ignition temperatures by adjustment of the manifold temperature. It is primarily used is to assess the resistance to ignition of fire-resistant hydraulic fluids which are, by definition, difficult to ignite. It may be used with other types of more flammable fluids at lower surface temperatures, but this could significantly increase the hazards of this procedure.