Selecting the proper media for grinding and milling operations is essential. Grinding media is used in these processes to grind or crush material to both reduce particle size and refine material. Grinding media is available in a broad variety of materials, shapes, and sizes. Which media is appropriate depends on the specifics of the intended application.
Mixing, crushing, dispersing, and purifying variable materials generally requires some type of grinding media ball or bead. Various properties influence how the work material is processed and how long the media can be used for. Many facets of grinding media can be customized, such as:
STR Industries is a professional ball manufacturer and we have been manufacturing media for 30 years. We are TS 16949(auto industry standard, higher than ISO 9001) certified. Our 200,000 square foot facilities produce more than 400 metric tons of balls per month. Our product sizes range from 0.8mm to 80mm in chrome, carbon, stainless steel, plastic and ceramics material.
Our grinding media is approved by customers not only in the ink but also pigment, paste, ferrite and food industries. We have been providing customers worldwide directly with our products saving substantial amount of money. If you are not sure what media you need, we offer free consultations to make sure you get the perfect product for your operation.
Ceramic media is ideal for applications that call for highly efficient grinding with low grinding media abrasion. Applications where mixing and dispersing effects impact the final outcome of a project will benefit from the use of ceramic media.
While steel media is common for grinding in many instances, it cannot be used to manufacture bright colors. Contamination from the steel is also an issue for some product types.
Ceramic beads present a number of benefits, such as:
At STR, we offer grinding media with ceramic materials such as:
Zirconia is used in grinding media, cutting tools, jewelry, refractory materials and a variety of other applications due to beneficial physical properties such as high hardness, strength, toughness, excellent wear resistance, electrical conductivity, and low thermal conductivity.
Zirconia beads make the best use of the structural properties in specific characters of zirconia. The various classifications of zirconia include:
Featuring high density and exceptional hardness, Yttria Stabilized Zirconia Beads ZY offer higher productivity, longer mill life, and lower long-term operational costs. These 100% round and uniform beads are available in sizes ranging from 0.1–2.7 mm.
Ceria Stabilized Zirconia Beads CZ offer the highest density, optimized wear resistance, and cost effectiveness as an efficient milling media. Available sizes range from 0.3–2.7 mm, and these beads are also guaranteed to be 100% round and uniform.
|Composition||Density g/cm3||Bulk Density kg/l||Hardness Hv||Color|
|ZY||ZrO2 / Y2O3||>6.02||> 3.7||>1350||Ivory|
|CZ||ZrO2 / CeO2||>6.20||> 3.9||>1250||Brown|
|Steel||See steel info||7.8||4.9||60-65 RC||Silver|
Aluminum oxide is known for high strength and surface area properties, along with corrosion and heat resistance.
|AISI Number||C %||Si %||Mn %||Mo %||P %||S %||Hardness|
|AISI 1008||0.10 Max||0.30 Max||0.50 Max||0.012||0.07 Max||0.06 Max||Case Hardened
|AISI 1015||0.13~0.18||0.10~0.30||0.30~0.60||0.02||0.04max||Case Hardened
|AISI 1045||0.43~0.50||0.10~0.30||0.60~0.90||0.025||0.04 Max||0.05 Max||Through Hardened
HRC 60 Min
|AISI 1086||0.83~0.88||0.10~0.30||0.30~0.70||0.04||0.04 Max||0.04 Max||Through Hardened
HRC 60 Min
3 ~ 1000
Casters, bicycle parts, light-duty bearing, hardware, toy and etc.
|C %||Si %||Mn %||Cr %||Cu %||S %||P %|
|0.90~1.05||0.15~0.35||0.25~0.45||1.35~1.65||0.3 Max||0.03 Max||0.03 Max|
Through hardened, HRC 60 Min. Grade
5~ 1000 grade
Bearing, Ball Screw, Linear motion guide, Auotomotive parts, Chemical, food processing.
|C %||Si %||Mn %||Cr %||Ni %||Mo %||P %||S %||Character|
|AISI 302||0.15 Max||1.00 Max||2.00 Max||17.0~ 19.0||8.0~ 10.5||0.045 Max||0.03 Max||Slightly
|AISI 304||0.07 Max||1.00 Max||2.00 Max||17.0~ 19.0||8.50~ 10.5||0.045 Max||0.03 Max||Slightly
|AISI 316||0.07 Max||1.00 Max||2.00 Max||16.5~ 18.5||10.5~ 13.5||2000~ 2.50||0.045 Max||0.03 Max||Nonmagnetic
|AISI 420J||0.17~ 0.25||1.00 Max||1.00 Max||12.0~ 14.0||0.045 Max||0.03 Max||Magnetic
48 Min fair
|AISI 430||0.08 max||1.00 Max||1.00 Max||15.5~ 17.5||0.045 Max||0.03 Max||Fair- good
|AISI 440C||0.95~ 1.20||1.00 Max||1.00 Max||16.0~ 18.0||0.40~ 0.80||0.04 Max||0.02 Max||Fair corrosion
Dispenser valve ball, stainless steel bearing, chemical related application
Some of the industries that rely on ceramic grinding media include:
In addition to ceramic media, we also offer a selection of metallic grinding media. Balls may be made of carbon steel, glass, chrome steel, or stainless steel and range from 0.8–80 mm.
Our grinding media is subjected to a variety of production and inspection processes before being sent to the customer, such as:
STR Industries has been manufacturing media of various types for 30 years and we are TS 16949 certified for quality assurance. We operate more than 200,000 square feet of facility space that produces more than 400 metric tons of balls per month. Our grinding media is used by customers in sectors ranging from inks and pigments to food and beverage. Some of our customers include BASF, Akzo Nobel, Sun Chemical, and many large mill manufacturers and users.
For more information on our capabilities or available grinding media, please contact us.
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