GB/T 28957.1-2023 in English

《GB/T 28957.1-2023道路车辆 用于滤清器评定的试验粉尘 第1部分：氧化硅试验粉尘》由TC114（全国汽车标准化技术委员会）归口，TC114SC25（全国汽车标准化技术委员会滤清器分会）执行，主管部门为工业和信息化部。

GB/T 28957.1-2023 Road vehicles - Test dust for filter evaluation - Part 1: Silicon dioxide test dust

1 Scope

This document defines particle size distribution and chemical content limits involving two kinds of test dusts, namely, four grades of test dust made from Arizona desert sand, and BF silicon dioxide series test dust.

This document is applicable to the performance evaluation for filter of road vehicles, it is also applicable to the performance evaluation for filter of general-purpose internal combustion engines, as well as wear studies involving bearings, seals, etc.

This document is not applicable to the calibration of particle counters. For this purpose, please refer to GB/T 18854.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 176-2017 Method for chemical analysis of cement (ISO 29581-1:2009, NEQ)
GB/T 19077-2016 Particle size analysis - Laser diffraction methods (ISO 13320:2009, IDT)
GB/T 21780-2008 Particle size analysis - Sedimentation analysis in the gravitational field - Pipette method (DIN 66115:1983, IDT)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1
bulk density
mass of the particle divided by the volume of the container when the container of a known volume is filled in the natural way

Note: See GB/T 31057.1-2014 for the test method.

[Source: GB/T 16418-2008, 2.2.4.7]

3.2
true density
mass of the particle divided by its volume, excluding open and closed pores

Note: See 4.2 of GB/T 16913-2008 for the test method.

[Source: GB/T 16418-2008, 2.2.4.1]

4 Test dust description

4.1 Arizona test dust

4.1.1 General

Arizona test dust is manufactured from Arizona desert sand. Arizona desert sand is a naturally occurring dust consisting primarily of silicon dioxide with smaller amounts of other compounds. It is collected from the Salt River area of Arizona desert and sized to specific particle size. Arizona desert sand has also been referred to as Arizona road dust, Arizona test dust, Arizona silica, AC fine or coarse test dust, and SAE fine or coarse test dust.

4.1.2 Classification, coding and loose bulk density

Arizona test dusts are divided into four categories according to the particle size: The true density of Arizona desert sand is approximately 2,650kg/m3. Bulk density of Arizona test dust varies with particle size (see Table 1 for specific data).

Table 1 Bulk density of Arizona test dust

Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Test dust description
5 Particle size distribution
6 Chemical composition
Annex A (Informative) Comparison of clause/subclause numbers between this document and ISO 12103-1:2016
Annex B (Informative) Technical differences between this document and ISO 12103-1:2016 and their justifications
Annex C (Informative) Particle size distribution of BF silicon dioxide test dust
Annex D (Normative) Analysis equipment and operating procedure
Annex E (Informative) Handling and preparation
Bibliography