White corundum fine powder 325 mesh 200 mesh white corundum for precision casting

• White corundum is made of high-quality aluminum oxide powder as raw material, crystallized by electromelting, high purity, good self-sharpening, acid and alkali corrosion resistance, high temperature resistance, stable thermal performance, it is slightly harder than brown corundum, slightly lower toughness, strong grinding ability, small calorific value, high efficiency. It can be made into an abrasive, which can be applied to grinding fine-grained abrasives such as high carbon steel, high speed steel and stainless steel; It can also be used for precision casting and advanced refractories.
• Physical and chemical indicators:
  

  Physical properties	chemical composition	Content(%)
  Crystalline hexagon	Al2O3	≥99.55
  Main crystal: Al2O3
  Color: White	Na2O	≤0.3
  True density ≥3.9 g/cm3
  Bulk density 1.75-1.95 g/cm3	SiO2	≤0.01
  9 on the Mohs scale
  The coefficient of linear expansion is 8.3×10-4	Fe2O3	≤0.03

• Product model particle size comparison table:

• White corundum grain size sand		White corundum powder
  Granularity number	Particle size range (μm)	Granularity number	Particle size range (μm)
  12 #	2000-1700	W63	63-50
  16 #	1400-1180	W50	50-40
  20 #	1180-1000	W40	40-28
  22 #	1000-850	W28	28-20
  24 #	850-710	W20	20-14
  30 #	710-600	W14	14-10
  36 #	600-500	W10	10-7
  40 #	500-425	W7	7-5
  46 #	425-355	W5	5-3.5
  54 #	355-300	W3.5	3.5-2.5
  60 #	300-250	W2.5	2.5-1.5
  70 #	250-212	W1.5	1.5-0.5
  80 #	212-180	W0.5	0.5-0.3
  90 #	180-150
  100 #	150-125
  120 #	125-106
  150 #	106-75
  180 #	90-63
  220 #	75-53
  240 #	63-50
  280 #	50-40
  320 #	40-28

• White corundum sandblasting abrasive particle size sand performance and advantages:
• 1. Does not affect the color of the processed parts;
• 2. It can be used for sandblasting in the process where iron powder residues are strictly prohibited;
• 3. Micronized grade is very suitable for wet sandblasting and light polishing operations;
• 4. Fast processing speed and high quality;
• 5. The amount of iron oxide contained in it is extremely low, which is suitable for sandblasting operations where iron residues are strictly prohibited;
• 6. After pickling steps to remove.
• Suitable for all kinds of high-end products, processes or hardware and other products surface beautification treatment, after sandblasting the surface is white without any impurities, eliminating cleaning troubles. Fine white corundum can be used as a choice for polishing and grinding, and can also be used as a product additive.
• 1. Surface processing: metal oxide layer, carbide black skin, metal or non-metal surface rust removal, such as gravity die casting mold, rubber mold oxide or release agent removal, ceramic surface black spots, uranium color removal, painted rebirth.
• 2. Beautification processing: all kinds of gold, K gold jewelry, precious metal products matting or matte treatment, crystal, glass, corrugation, acrylic and other non-metallic matte processing and can make the surface of the processed object into metallic luster.
• 3. Etching processing: jade, crystal, agate, semi-precious stones, seals, elegant stones, antiques, marble tombstones, ceramics, wood, bamboo pieces, etching art.
• 4. Pre-treatment processing: Teflon, PU, rubber, plastic coating, rubber roller barrel (ROLLER), electroplating, metal spray welding, titanium plating, etc. before treatment, so that the surface adhesion increases.
• 5. Burr processing: bakelite, plastic, zinc, aluminum die-casting, electronic parts, magnetic core, etc. Force elimination processing.
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