ISO 11127-4:2020 标准是针对非金属喷砂清理磨料的硬度评估方法，即玻璃片测试。该测试方法是通过将磨料样品均匀地分布在玻璃片上，然后用标准压力将另一块玻璃片压在样品上，观察样品表面的划痕情况，从而评估磨料的硬度。该测试方法适用于评估非金属喷砂清理磨料的硬度，以及与其他磨料的硬度进行比较。

该标准适用于涂料前钢基底处理。在涂料前，钢基底需要进行清理和处理，以确保涂层能够牢固地附着在钢表面上。非金属喷砂清理磨料是一种常用的清理和处理方法，可以有效地去除钢表面的污垢、氧化物和锈蚀物，从而提高钢表面的粗糙度和表面活性，使得涂层能够更好地附着在钢表面上。

该标准的实施可以帮助用户选择合适的非金属喷砂清理磨料，以及评估不同磨料之间的硬度差异。同时，该标准还可以帮助用户控制磨料的质量，确保磨料的硬度符合要求，从而提高钢表面的清理效果和涂层的附着力。

ISO 11127-4:2020 标准的主要内容包括：术语和定义、测试原理、测试设备、测试程序、测试结果的记录和报告等。该标准还规定了测试时需要注意的事项，如样品的准备、测试环境的控制、测试设备的校准等。

相关标准
ISO 11127-1:2011 Preparation of steel substrates before application of paints and related products — Test methods for non-metallic blast-cleaning abrasives — Part 1: General introduction and classification
ISO 11127-2:2011 Preparation of steel substrates before application of paints and related products — Test methods for non-metallic blast-cleaning abrasives — Part 2: Determination of particle size distribution
ISO 11127-3:2011 Preparation of steel substrates before application of paints and related products — Test methods for non-metallic blast-cleaning abrasives — Part 3: Determination of apparent density
ISO 8501-1:2007 Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings
ISO 8503-1:2012 Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces