China manufacturer aluminum oxide mesh 80 for sandblasting

White corundum standard physical detection:

• 1, the size of sand grain size composition according to GB / T2481-1998 "abrasive particle size composition determination method" for testing, the results should be consistent with GB / T24 77-96 "abrasive particle size and its composition" requirement; section sand grain size coarse particles ≤ 5 %, Fine particles ≤ 5%, 90% of the basic particles through.
• 2, magnetic and ferrous alloy particles to allow the content according to JB / T6570-1993 "abrasive magnetic content determination method" in the provisions of the test.
• 3, the bulk density according to JB / T7984.2-1995 "common abrasive bulk density measurement method" for testing.
• 4, particle density by JB / T7984.3-1995 "common abrasive particle density measurement method" for testing.

Criteria for corundum blocks:

• 1, corundum: excellent grade 96.3% ≤AL2O3 ≤ 96.9% TiO2 <2.6% first grade 95.5% ≤AL2O3 ≤ 96.3% TiO2 <3.0%
• 2, white corundum: excellent grade 99.6% ≤AL2O3 ≤ 99.8% Na2O <0.3% first grade 99.0% ≤AL2O3 ≤ 99.5% Na2O <0.45%

Corundum Chemical analysis criteria: Corundum: GB / T3043-2000 "Corundum analysis method" GB / T3044-1989 "white corundum analysis method"

Finished product testing methods and standards: corundum: GB / T2478-1996 standard white corundum: GB / T2479-1996 standard

• 1.White corundum chemical composition, corundum is divided into natural corundum and artificial corundum. Natural corundum is a pure alumina (Al2O3). The main mineral composition of artificial corundum is physical corundum. Artificial corundum is divided into corundum (A), white corundum (WA), chrome corundum (PA), zirconia corundum (ZA), black corundum (BA), monocrystalline corundum (SA), microcrystalline corundum (MA) Corundum is mainly made of bauxite, iron and anthracite in the arc furnace by melting and reducing impurities; white corundum is made of aluminum oxide powder in the electric arc furnace by melting crystal; other corundum is based on different alumina content A certain amount of other oxide-derived material with different properties is added during the melting process. A large number of applications of corundum for corundum, white corundum.

• 2. Main features and uses

Corundum with a considerable hardness and a certain degree of toughness, can be granulated into different sizes and grain shape neat and uniform grain, with high temperature stability and chemical stability. Corundum Mohs hardness of 9, the hardness of 1800-2200kg / mm2; white corundum Mohs hardness of 9, micro hardness of 2200-2400kg / mm2, second only to the diamond. Corundum, white corundum is the manufacture of consolidated abrasive and advanced refractory materials and products of the main material, can also be used for non-slip, grinding, investment casting, senior ceramics and so on.

• 3. Main specifications and technical indicators

(1) Specifications: At present, China's regulations apply to the manufacture of abrasive or abrasive materials used corundum, according to the size of the size can be divided into 41 specifications: 16 #,24#,30#,36#,46#,54#,60#,70#,80#,100#,120# 150 #, 180 #, 220 #, 240 #. W63, W50, W40, W28, W20, W14, W10, W7, W5, W3.5, W2.5, W1.5, W1.0, W0.5. The particle size of each particle size composition should be consistent with GB2477-83 "abrasive particle size and its composition" requirement, apply to refractory materials and their products, corundum specifications and particle size composition can be determined according to user requirements.

(2) chemical composition: corundum physical properties of the pros and cons is mainly determined by the chemical composition, the conventional processing of broken corundum, coarse grain size of the general Al2O3 content is higher, fine particle size due to the relative increase in impurities, Al2O3 content decreased.

(3) density: corundum density is to determine the size of corundum crystal density of the main factors to 46 # particle size as the representative number of not less than 3.90g / cm3, in the absence of 46 # case can also be replaced by the adjacent number.