ISO 18335:2024 pdf download - Petroleum products and related products - Determination of kinematic viscosity by calculation from the measured dynamic viscosity and density – Method by constant pressure viscometer

ISO 18335:2024 pdf download - Petroleum products and related products - Determination of kinematic viscosity by calculation from the measured dynamic viscosity and density – Method by constant pressure viscometer.
石油产品和相关产品 - 通过测量动态粘度和密度计算运动粘度的测定 - 恒压粘度计法。
This document specifies a procedure for determining dynamic viscosity, η, and density, ρ, for the calculation of kinematic viscosity, ν, of middle distillate fuels, fatty acid methyl ester fuels (FAME) and mixtures thereof, up to 60 % with middle distillate fuels, and lubricating oils (e.g. base oils, formulated oils), and synthetics, using a constant pressure viscometer. The range of kinematic viscosities covered in this test method is from 0,5 mm2/s to 2 000 mm2/s, with precision at 40 °C from 1,0 mm2/s to 1 286 mm2/s, and precision at 100 °C from 3,0 mm2/s to 157 mm2/s.
The result obtained using the procedure described in this document depends on the rheological behaviour of the sample. This document is predominantly applicable to liquids whose shear stress and shear rate are proportional (Newtonian flow behaviour). However, if the viscosity changes significantly with the shear rate, comparison with other measuring methods is only permissible at similar shear rates.
本文件规定了使用恒压粘度计测定中间馏分燃料、脂肪酸甲酯燃料（FAME）及其混合物（最高60%与中间馏分燃料和润滑油（如基础油、配方油）以及合成油）的动态粘度η和密度ρ的程序，以计算运动粘度η。本试验方法所涵盖的运动粘度范围为0.5 mm2/s至2000 mm2/s，在40°C下的精度为1.0 mm2/s至1 286 mm2/s，而在100°C下，精度为3.0 mm2/s至157 mm2/s。
使用本文件中描述的程序获得的结果取决于样品的流变行为。本文件主要适用于剪切应力和剪切速率成比例（牛顿流动行为）的液体。然而，如果粘度随剪切速率显著变化，则仅允许在类似的剪切速率下与其他测量方法进行比较。
The purpose of this document is to specify a procedure for measuring dynamic viscosity and density,and then calculating kinematic viscosity from these measurements,when applied to petroleum and related liquids.Kinematic viscosity is often a characteristic that is specified in product specifications and is afrequent measurement in testing laboratories.The constant pressure viscometer provides a versatile and efficient technique using less time and labour for the laboratory.