Grinding Balls & Other Grinding Media

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How to Select Grinding Media Video
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"How to Select Grinding Media"


Union Process is the source for the most up-to-date information on grinding balls and other media. Click the link at left to download a detailed sheet, outlining factors to consider when selecting grinding media, along with specifications on the most common types of media.


How To Select Your Grinding Balls and Other Grinding Media

Union Process, Inc., innovator and custom-manufacturer of the ATTRITOR and DMQX-Mill, meets all your grinding and dispersing requirements with a full line of the highest quality grinding media, including carbon steel, stainless steel and chrome steel grinding balls. Selection of grinding media depends upon several factors, some of which are interrelated:

* Initial feed size-Smaller media cannot easily break up large particles.

* Final particle size-Smaller media are more efficient when ultrafine particles are desired.

* Specific gravity-In general, high-density media give better results. The media should be more dense than the material to be ground. Also, highly viscous materials require media with a higher density to prevent floating.

* Hardness-The harder the media, the better the grinding efficiency and, consequently, the longer the wear.

* pH-Some strong acid or basic slurries may react with certain metallic media.

* Discoloration-Certain media result in color development and are, therefore, not suitable in the production of some materials such as white coatings.

* Contamination-Material resulting from the wear of the media affect the product and may need to be removed by a magnetic separator, chemicals, or a sintering process.

* Costs-Media that may be 2-3 times more expensive may last considerably longer, and therefore, be well worth the extra cost over the long run.

Our skilled technical service representatives are always available for consultation and ready to assist you with the selection of media that best answers your particular needs.

GRINDING MEDIA SPECIFICATIONS
Sizes shown in red indicate media that is recommended for use in small media mills except where stated otherwise.

Metallic

Carbon Steel Grinding Balls (SAE 1013 -- case-hardened, SAE 1065--through-hardened)

Specific Gravity: 7.8

Hardness: ROCKWELL C 60 - 62

Relative Cost: Low

Sizes Available:

1/8". 3/16", 1/4", 5/16". 3/8". 1/2"

Chrome Steel Grinding Balls (SAE 52100)

Specific Gravity: 7.8

Hardness: ROCKWELL C 62 - 66

Relative Cost: Low to Moderate

Sizes Available:

1mm, 1.59mm, 2mm

1/8", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", 1/2", 2mm, 2.38mm, 3.2mm

Stainless Steel Grinding Balls (AISI 440-C)

Specific Gravity: 7.7

Hardness: ROCKWELL C 55-64

Relative Cost: Moderate

Sizes Available:

1/8", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", 1/2", 3/4"

Steel Shot, Through-Hardened

Specific Gravity: 7.7

Hardness: ROCKWELL C 55 - 60

Relative Cost: Low

Sizes Available:

.25mm, .40mm, .50mm, .71mm, 1.18mm, 1.40mm, 1.70mm, 2mm

2.36mm, 2.80

Non-Metallic

Alumina

99.9% Balls

Specific Gravity: 3.9

Hardness: Hv 1750 kg/mm2

Relative Cost: Moderate

Sizes Available:

0.2mm, 0.5mm

1mm, 2mm, 3mm, 5mm, 10mm

99.5% Balls

Specific Gravity: 3.4 - 3.7

Hardness: Hv 1350 kg/mm2

Relative Cost: Moderate

Sizes Available:

0.2mm, 0.5mm

1mm, 2mm, 3mm, 5mm, 8mm, 10mm, 15mm, 20mm

 

99% Satellites

Specific Gravity: 3.4 - 3.7

Hardness: ROCKWELL 45N 78-79

Relative Cost: Moderate

Sizes Available:

3/16", 1/4"

 

96% Satellites

Specific Gravity: 3.4 - 3.7

Hardness: Hv 1400 kg/mm2

Relative Cost: Low to Moderate

Sizes Available:

1/4", 1/2"

94% Satellites

Specific Gravity: 3.4 - 3.7

Hardness: Hv 1200 kg/mm2

Relative Cost: Low to Moderate

Sizes Available:

1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 13mm, 15mm, 20mm

90% Satellites

Specific Gravity: 3.4 - 3.7

Hardness: ROCKWELL 45N 75

Relative Cost: Low

Sizes Available:

3mm, 7/32", 1/4", 3/8". 1/2"

Ceramic (Steatite) Satellites

Specific Gravity: 2.6 - 2.7

Hardness: ROCKWELL 45N 60-65

Relative Cost: Low to Moderate

Sizes Available:

1/8", 1/4", 5/16", 3/8", 1/2"

Glass Beads (Lead Free)

Specific Gravity: 2.5

Hardness: KNOOP 515 kg/mm2
Cost: Low
Sizes Available:

0.4 – 0.6mm, 0.5 – 0.75mm, 0.6 – 0.8mm, 0.75 – 1.0mm,0.8 – 1.0mm, 1.0 – 1.2mm, 1.0 – 1.25mm, 1.1 – 1.3mm,

1.2 – 1.4mm, 1.25– 1.55mm, 1.4 – 1.6mm, 1.55 – 1.85mm, 1.6 – 1.8mm, 1.7 – 2.0mm, 1.8 – 2.0mm
2.0 – 2.3mm, 2.0 – 2.4mm, 2.3– 2.6mm, 2.3 – 2.7mm, 2.5– 2.85mm, 2.8 – 3.2mm, 2.85– 3.3mm, 3.2 – 3.8mm,

3.3– 3.6mm, 3.6 – 4.1mm, 3.7 – 4.3mm, 4.2 – 4.8mm, 4.7 – 5.3mm, 5.0mm, 5.7 – 6.3mm, 6.0mm,

6.7 – 7.3mm, 7.0mm, 7.6 – 8.4mm, 8.0mm, 8.6 – 9.4mm, 9.0mm, 9.5 – 10.5mm, 10mm, 10.5 – 11.5mm, 12mm, 14mm, 15mm, 16mm

Mullite Beads

Specific Gravity: 2.8

Hardness: ROCKWELL 45N 70

Relative Cost: Low

Sizes Available:

1/8"

Nylon Pellets

Specific Gravity: 0.7 - 1.2

Relative Cost: Low to Moderate

Sizes Available:

1/8"

Silicon Carbide Satellites

Specific Gravity 3.1

Hardness: KNOOP 2800 kg/mm2

Relative cost: Very High

sizes Available:

3/16", 1/4"

Silicon Nitride Balls

Specific Gravity: 3.2

Hardness: Hv 1400 - 1500 kg/mm2

Relative cost: Very High

Sizes Available:

0.5mm, 0.8mm, 1mm

2mm, 3mm, 5mm, 10mm, 15mm, 20mm, 25mm

Tungsten Carbide Satellites

Specific Gravity: 14.4 - 14.8

Hardness: 88 - 89HRA

Relative Cost:  Moderate to High

Sizes Available:

3/32", 1/8",  5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 3/8", 7/16", 1/2"

Zirconium Oxide, High-Purity (Y203 Stabilized)

95% - Balls

Specific Gravity: 6.0

Hardness: Hv 1280 kg/mm2

Relative Cost: High

Sizes Available:

0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.65mm, 0.8mm, 1mm, 1.25mm, 1.5mm, 1.75mm

2mm, 3mm, 5mm, 6mm, 8mm, 10mm, 20mm, 25mm

 

93% - Beads

Specific Gravity: 6.0

Hardness: Hv 1280 kg/mm2

Relative Cost: High

Sizes Available:

0.5–0.7mm, 0.7–0.9mm, 0.9–1.1mm, 1.1–1.4mm, 1.3–1.6mm, 1.5–1.9mm

 

Zirconium Oxide (CeO2 rare earth stabilized) Sizes up to 3/16" are beads, 3/16" or larger are satellites.

Specific Gravity: 6.0

Hardness: Hv 1150 kg/mm2

Relative Cost: Moderate

Sizes Available:

0.4–0.6mm, 0.6–0.8mm, 0.8–1.0mm, 0.7–1.2mm, 1.0–1.2mm, 1.2–1.4mm, 1.4–1.6mm

1.7–2.4mm, 2.4–2.8mm, 2.8–3.3mm, 3/16", 1/4", 5/16". 6mm, 8mm, 10mm, 12.5mm, 16mm, 21mm, 26mm, 31mm

Zirconium Oxide (MgO stabilized)  Sizes up to 1/4" are beads, 1/4" or larger are satellites.

Specific Gravity: 5.4

Hardness: Hv 900 - 1000kg/mm2

Relative Cost: Moderate

Sizes Available:

0.6–0.85mm, 0.85–1.18mm, 1.18–1.4mm, 1.4–1.7mm, 1,7–2.3mm

1/4", 3/8", 1.2", 3/4"

Zirconium Sillcate Beads

Specific Gravity: 3.85

Hardness: MOHS 7.0

Relative Cost: Moderate

Sizes Available:

0.1–0.2mm, 0.2–0.3mm, 0.3–0.4mm, 0.4–0.6mm, 0.6–0.8mm, 0.8–1.0mm, 1.0–1.25mm, 1.25mm. 1,25–1.6mm, 1.6–2.0mm

2.0–2.5mm, 2.5–2.8mm, 2.5–3.15mm



NOTE: Grinding balls and media are sold on a per pound basis, but ATTRITORS and DMQX-Mills are loaded by volume. Therefore, the more dense the media, the more pounds of media required. For instance, a machine requiring only 40 lbs. of stainless steel may require up to 80 lbs. of tungsten carbide. Information contained herein is accurate and reliable to the best of our knowledge, but our suggestions and recommendations cannot be guaranteed because the conditions of use are beyond our control.

For more information, contact Media Sales.
Phone: (330) 929-3333 x228
Fax: (330) 929-3034
E-mail: mediasales@unionprocess.com

 



1925 Akron-Peninsula Rd.     •     Akron, Ohio 44313     •     330.929.3333     •     Fax: 330.929.3034     •     

 

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