GRINDING MEDIA

SIZES SHOWN IN RED INDICATE MEDIA THAT ARE 2MM OR SMALLER DESCRIPTION SPECIFIC GRAVITY HARDNESS RELATIVE COST SIZES AVAILABLE METALLIC Carbon Steel Balls (SAE 1065 – Through-Hardened) 7.8 ROCKWELL C 60 – 62 Low 1 ⁄ 8 " , 3 ⁄ 16 " , 1 ⁄ 4 " , 5 ⁄ 16 " , 3 ⁄ 8 " , 1 ⁄ 2 " Chrome Steel Balls (SAE 52100) 7.8 ROCKWELL C 60 – 67 Low to Moderate 1mm , 2mm , 1 ⁄ 8 " , 5 ⁄ 32 " , 3 ⁄ 16 " , 7 ⁄ 32 " , 1 ⁄ 4 " , 5 ⁄ 16 " , 3 ⁄ 8 " , 1 ⁄ 2 " , 3 ⁄ 4 " , 1 " Stainless Steel Balls (AISI 440-C) 7.7 ROCKWELL C 58 – 65 Moderate 2mm *, 1 ⁄ 8 " , 5 ⁄ 32 " , 3 ⁄ 16 " , 7 ⁄ 32 " , 1 ⁄ 4 " , 5 ⁄ 16 " , 3 ⁄ 8 " , 1 ⁄ 2 " , 3 ⁄ 4 " , 1 " Steel Shot, Through-Hardened 7.6 ROCKWELL C 55 – 60 Low 0.25mm , 0.50mm , 0.60mm , 0.71mm , 0.85mm , 1mm , 1.18mm , 1.40mm , 1.70mm , 2mm , 2.36mm, 2.80mm Forged Steel Balls N/A 55 – 63HRC Very Low 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 65mm, 75mm, 90mm, 100mm, 125mm High Chrome Cast Balls 10–13% N/A Surface=≥60HRC Core=≥58HRC Very Low 6mm, 8mm, 10mm, 12mm, 15mm, 17mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm High Chrome Cast Balls 14–18% N/A Surface=≥62HRC Core=≥60HRC Very Low 6mm, 8mm, 10mm, 12mm, 15mm, 17mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm NON-METALLIC Alumina 99.9%— Balls 3.9 Hv 10 = 1800 High 0.5mm , 1mm , 2mm , 3mm, 5mm, 10mm, 15mm, 20mm, 25mm 99.5%— Balls 3.8 Hv 1300 kg/mm 2 Moderate 0.2mm , 0.3mm , 0.5mm , 1mm , 2mm , 3mm, 5mm, 8mm, 10mm, 15mm, 20mm 94%— Balls 3.59 Hv 1200 kg/mm 2 Low to Moderate 0.5mm , 1mm , 2mm , 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 13mm, 15mm, 20mm 90%— Beads and Satellites 3.4 – 3.7 ROCKWELL 45N 75 Low 3mm, 7 ⁄ 32 " , 1 ⁄ 4 " , 3 ⁄ 8 " , 1 ⁄ 2 " Note: 3mm size are Beads-remaining four sizes are satellites Alumina Beads N/A Mohs 9 VICKERS (0.5 kg) 1200 ± 50 Low to Moderate 0.25–0.34mm , 0.34–0.44mm , 0.4–0.6mm , 0.8–1.2mm , 1.2–1.6mm , 1.4–1.6mm , 1.6–1.8mm , 1.8–2.0mm , 2.0–2.5mm, 2.5–3.0mm Burundum Cylinders Alumina 90%— (White) 3.42 Mohs 9 Moderate 1 ⁄ 4 " , 1 ⁄ 2 " , 13 ⁄ 16 " , 1 1 ⁄ 4 " 96%— (White) 3.65 Mohs 9+ Moderate 1 ⁄ 4 " , 1 ⁄ 2 " , 13 ⁄ 16 " , 1 1 ⁄ 4 " 99%— (Tan) 3.85 Mohs 9+ Moderate 1 ⁄ 2 " , 13 ⁄ 16 " , 1 " , 1 1 ⁄ 4 " Ceramic (Steatite) Satellites 2.6 – 2.7 ROCKWELL 45N 60 – 65 Low to Moderate 1 ⁄ 4 " , 5 ⁄ 16 " , 3 ⁄ 8 " , 1 ⁄ 2 " , 20mm, 25mm Glass Beads (Lead Free) 2.5 KNOOP 515 kg/mm 2 Low 0.25–0.50mm , 0.40–0.60mm , 0.6–0.8mm , 0.75–1.0mm , 0.80–1.0mm , 1mm , 1.5mm , 1.0–1.25mm , 1.25–1.55mm , 1.55–1.85mm , 1.7–2.0mm , 2mm , 2.0–2.4mm, 2.4–2.9mm, 2.85–3.45mm, 3mm, 3.5mm, 3.6–4.1mm, 3.8–4.1mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 16mm Nylon Pellets 0.7 – 1.2 Low to Moderate 1 ⁄ 8 " Silicon Carbide Balls 3.1 Hv 2500 kg/mm 2 Very High 5mm, 10mm, 15mm, 20mm Silicon Nitride Balls 3.2 Hv 10 = 1300 Very High 2mm , 3mm, 5mm, 10mm, 15mm, 20mm, 25mm Tungsten Carbide Satellites or Balls 14.4 – 14.8 92.0 ± 0.5 Hra Moderate to High 3 ⁄ 32 " , 1 ⁄ 8 " , 5 ⁄ 32 " , 3 ⁄ 16 " , 7 ⁄ 32 " , 1 ⁄ 4 " , 9 ⁄ 32 " , 5 ⁄ 16 " , 3 ⁄ 8 " , 7 ⁄ 16 " , 1 ⁄ 2 " , 9 ⁄ 16 " , 3 ⁄ 4 " , 1 " Note: Smaller sizes beginning at 0.5mm available upon request. Zirconium Oxide, High-Purity (Y 2 O 3 Stabilized) 95%— Balls 6.0 Hv 1150 kg/mm 2 High 0.03mm , 0.05mm , 0.1mm , 0.2mm , 0.3mm , 0.4mm , 0.5mm , 0.65mm , 0.8mm , 1mm , 1.25mm , 1.5mm , 2mm , 3mm, 5mm, 6mm, 8mm, 10mm, 15mm, 20mm, 25mm Note: 6mm and 8mm limited availability. Cylinders available in 3 ⁄ 8 " and 1 ⁄ 2 " sizes. 93%— Beads 6.0 Hv 1250 HV1 Moderate 0.1mm , 0.15–0.28mm , 0.25–0.35mm , 0.35–0.45mm , 0.45–0.55mm , 0.6mm , 0.8mm , 1.0mm , 1.25mm , 1.5mm , 1.75mm , 2.0mm , 2.3mm Zirconium Oxide (CeO 2 Rare Earth-Stabilized) Sizes up to 2.8–3.3mm are beads, 6mm and larger are satellites. 6.0 Hv 1200 – 1250 Moderate 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, 6mm, 8mm, 10mm, 12.5mm, 16mm, 21mm, 26mm, 31mm Zirconium Silicate Beads Sintered (58% ZrO 2 , 37% SiO 2 ) 4.0 800 HV1 Moderate 0.8–1.0mm , 1.0–1.2mm , 1.2–1.4mm , 1.4–1.6mm , 1.6–1.8mm , 1.8–2.0mm , 2.0–2.2mm, 2.2–2.4mm, 2.4–2.6mm, 2.5–2.8m Fused (68% ZrO 2 , 30% SiO 2 ) 3.8 700 HV1 Moderate 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 , 1.25–1.6mm , 1.6–2.0mm , 2.0–2.5mm 1925 Akron-Peninsula Road • Akron, Ohio 44313-4896 Phone: 330.929.3333 • Fax: 330.929.3034 unionprocess@unionprocess.com • www.unionprocess.com © 2018 Union Process, Inc. All Rights Reserved. *These sizes are available in large quantities only as a special order.

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