Conventional abrasive-White fused alumina
1 Scope
This document specifies the grade, technical requirements, test methods, inspection rules and packaging, marking, transportation and storage of white corundum abrasives.
This document applies to the manufacture of solidified abrasives, coated abrasives use of white corundum abrasives.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through the normative references in the text. Among them, the date of the reference document, only the date of the corresponding version applicable to this document; undated reference document, its latest version (including all the revision of the list) applicable to this document.
GB/T 2481 (all parts) Abrasives for solidified abrasives Testing and marking of particle size composition
GB/T 3044 Chemical analysis method for white corundum and chrome corundum
GB/T 4676 General abrasives Sampling method
GB/T 9258 (all parts) Abrasives for coated abrasives Particle size analysis
JB/T 6569 General abrasives Packaging
JB/T 6570 General abrasives Determination method of magnetic substance content
JB/T 11433 General abrasives Determination of density
3 Terms and Definitions
There are no terms and definitions that need to be defined in this document.
4 Grades
The grades of white corundum abrasives are specified as follows:
--White corundum for ceramic bonded cemented and coated abrasives is available in grades WA;
--The grade of white corundum for organic bonded abrasives is WA-B.
5 Technical requirements
5.1 Chemical composition
The chemical composition of each grade should be in accordance with the provisions of Table 1.
Table 1 Chemical composition
Brand
Particle size range Chemical composition(mass fraction,%)
Al2 O3
No less than Na2 O
No more than
WA F4~F80 P12~P80 99-20 0-30
F90~F150 P100~P150 99-20 0-35
F180~F220 P180~P220 98-70 0-40
F230~F800(J240~J1500) P240~P1500 98-50 0-50
F1000~F1200(J2000~J2500) P2000~P2500 98-30 0-60
J3000~J8000 . 97-60 0-80
WA-B F4~F80 . 99-10 0-40
F90~F150 . 99-10 0-50
F180~F220 . 98-70 0-50
F230~F800(J240~J1500) . 98-50 0-50
F1000~F1200(J2000~J2500) . 98-30 0-60
J3000~J8000 . 97-60 0-80
5.2 Particle size composition
The particle size composition of abrasives for solidified abrasives shall conform to the provisions of GB/T 2481 (all parts).
The particle size composition of abrasives for coated abrasives shall conform to the provisions of GB/T 9258 (all parts).
5.3 Density
F220(P220) and the density of coarse grain size should be not less than 3-90g/Cm3, F230(J240, P240) and the density of fine grain size should be not less than 3.85g/Cm3.
5.4 Ferroalloy grain content
F30 (P36) and coarser particle sizes are zero for ferroalloy grains that do not pass the 355μm mesh sieve; F36 to F90 (P40 to P100) are zero for ferroalloy grains that do not pass the size check at the bottom sieve; F100 to F220 (P120 to P220) are zero for ferroalloy grains that do not pass the size check at the second bottom sieve.
5.5 Magnetic content
The magnetic content of each product grade should be in accordance with the provisions of Table 2.
Table 2 Magnetic content
1 Scope
2 Normative references
3 Terms and Definitions
4 Grades
5 Technical requirements
6 Test Methodology
7 Inspection rules
