Standard No.:	GB/T 32698-2016
English Name:	Rubber compounding ingredients一Determination of particle size distribution for silica,precipitated,hydrated—Laser diffraction
Chinese Name:	橡胶配合剂 沉淀水合二氧化硅粒度分布的测定 激光衍射法
Chinese Classification:	G49    Carbon black
Professional Classification:	GB    National Standard
ICS Classification:	83.040.20 83.040.20    Rubber compounding ingredients 83.040.20
Issued by:	AQSIQ; SAC
Issued on:	2016-06-14
Implemented on:	2017-1-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	5500 words
Price(USD):	130.0
Delivery:	via email in 1 business day

Rubber Compounding Ingredients — Determination of Particle Size Distribution for Silica, Precipitated, Hydrated — Laser Diffraction Warning: The personnel using this part shall have practical experience in standard laboratory work. This part does not address all of the safety problems. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This standard specifies a method for the determination of particle size distribution for silica, precipitated, hydrated, by laser diffraction. This standard is applicable to silica, precipitated, hydrated, for rubber compounding ingredients. The particle size range is 0.1 μm to 300 μm. Note: Since the optical model used in the laser diffraction method to determine the particle size distribution is set as spherical particle size, the particle size distribution of non-spherical particle size is equivalent to that of spherical particle size. The results of the associated particle size distribution may be different from those determined by other physical principles (e.g., sedimentation, sieving). 2 Normative References The following referenced documents are indispensable for the application 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 6003.1 Test Sieves — Technical Requirements and Testing — Part 1: Test Sieves of Metal Wire Cloth GB/T 8170 Rules of Rounding Off for Numerical Values & Expression and Judgment of Limiting Values GB/T 15445.1 Representation of Results of Particle Size Analysis — Part 1: Graphical Representation GB/T 19077.1 Particle Size Analysis — Laser Diffraction Method — Part 1: General Principles HG/T 3061 Rubber Compounding Ingredients — Silica Precipitated Hydrated 3 Terms and Definitions For the purposes of this document, the terms and definitions given in GB/T 19077.1 and the following apply. 3.1 silica, precipitated, hydrated material in the form of amorphous particles precipitated from an aqueous solution of soluble silicate 3.2 obscuration ratio of the cross-sectional area of the incident (excited) beam blocked (partially) by the measured sample particle to the total cross-sectional area of the incident (excited) beam 3.3 volume distribution particle size distribution based on particle volume. It is expressed as the percentage of the volume of particles in a certain size to the total volume of all particles 3.4 diameter add up 10% D10 particle size, in microns (μm), of the sample when the cumulative percentage of laser particle size distribution reaches 10% 3.5 median diameter D50 particle size, in microns (μm), of the sample when the cumulative percentage of laser particle size distribution reaches 50% 3.6 diameter add up 90% D90 particle size, in microns (μm), of the sample when the cumulative percentage of laser particle size distribution reaches 90%

Foreword II 1 Scope 2 Normative References 3 Terms and Definitions 4 Principle 5 Reagents 6 Apparatus 7 Sampling 8 Sampling Method and Disperse Medium 9 Test Conditions 10 Instrument Calibration 11 Procedures 12 Repeatability 13 Expression of Results 14 Test Report