关于确定油漆和清漆的吸入危害：如何将根据 ISO 2431 使用流动杯在 23°C ± 5°C 下通过流动时间测量得出的粘度转换为 40°C 下油漆或清漆的运动粘度？

关于确定油漆和清漆的吸入危害：如何将根据 ISO 2431 使用流动杯在 23°C ± 5°C 下通过流动时间测量得出的粘度转换为 40°C 下油漆或清漆的运动粘度？

In relation to the determination of the aspiration hazard of paints and varnishes: how to convert the viscosity derived from flow time measurements using a flow cup at 23°C ± 5°C according to ISO 2431 into the kinematic viscosity of the paint or varnish at 40°C?

根据CLP标准，吸入性危害的分类标准要求确定运动粘度，而基于流动时间的粘度不属于分类标准。ISO 2431标准包含流动时间与运动粘度之间的相关性。然而，目前尚无描述粘度温度依赖性的通用相关性，需要专家判断。

Under CLP, the classification criteria for the aspiration hazard require the determination of the kinematic viscosity while the viscosity based on flow time is not part of the classification criteria. ISO 2431 contains correlations between flow time and kinematic viscosity. However, there is no general correlation describing the temperature dependence of the viscosity, and expert judgement is necessary.