Description
ZOLI polished alumina ball mill jars are used whenever small quantity of samples need to be grinded. Good temperature endurance, good chemical corrosion resistance, good rapid thermal shock resistance, not easy to burst. Each jar set includes 1pc grinding jar, 1pc jar lid, and 1pc rubber sealing gasket.
We can customize various types of vacuum jar according to customer’s needs.
Physical Parameters
Composition
% | Specific Gravity
g/cm3 | Hardness
Mho’s | Bending strength (Mpa) | Water absorption rate
% |
| Al2O3 ≥ 99 | ≥3.8 | 9 | > 350 | ≤0.005 |
Specification Parameters
| Volume of Jar | Inner Diameter
(mm) | External Diameter
(mm) | Inner Depth
(mm) | Height of without lid
(mm) | Total Height
(mm) |
| 50ml | 38 | 55 | 52 | 60 | 67 |
| 100ml | 50 | 65 | 58 | 66 | 75 |
| 250ml | 74 | 92 | 70 | 78 | 88 |
| 500ml | 84 | 100 | 100 | 108 | 118 |
| 1L | 108 | 128 | 128 | 138 | 148 |
| 2L | 138 | 158 | 140 | 150 | 162 |
| 3L | 138 | 158 | 198 | 208 | 220 |
Packages:
Technical Insights
This product is a precision-engineered milling container designed for maximum durability and grinding efficiency in ball mills. The description itself is packed with technical meaning, which we can unpack as follows:
1. "Cylindrical"
Design Geometry: This refers to the classic, straight-walled cylinder shape of the jar.
Functional Advantages:
Uniform Milling Action: The consistent internal diameter ensures predictable and even movement of the grinding balls and powder, leading to a more homogeneous final product.
Efficient Use of Space: Maximizes the available volume for sample and grinding media.
Ease of Cleaning: The lack of complex contours or shoulders makes it easier to empty and clean thoroughly between uses.
2. "99% Alumina" (Al₂O₃)
This is the most critical material specification.
Purity: "99%" indicates the jar is made from a high-purity alumina ceramic, meaning it contains 99% aluminum oxide and only 1% sintering aids and other trace oxides.
Performance Implications of High Purity:
Extreme Hardness: Corundum (the crystalline structure of Al₂O₃) is 9 on the Mohs scale, second only to diamond. This 99% purity ensures near-maximum hardness for exceptional wear resistance.
Enhanced Mechanical Strength: Higher purity generally translates to higher density and superior fracture toughness, allowing the jar to withstand the high-impact forces of a planetary ball mill.
Superior Chemical Inertness: The high purity minimizes the risk of chemical reactions and ensures excellent resistance to acids and alkalis (with the standard exceptions of HF and strong hot alkalis). It drastically reduces the risk of contaminating your sample.
3. "Grinding Tank" / "Ball Grinding Jar"
Function: These are straightforward terms describing the product's primary purpose: it is a container ("tank" or "jar") in which the grinding process occurs via the action of grinding balls.
4. "Vertical"
Operational Orientation: This typically refers to the jar's intended mounting position in a specific type of mill.
In many planetary ball mills, the jars are mounted vertically on a rotating disk (the "sun wheel").
This is in contrast to traditional horizontal roller mills (jar mills), where jars rotate on their horizontal axis.
The design is optimized for the complex centrifugal forces experienced in this vertical orientation.
5. "Wear-Resistant Corundum"
Material Science Definition: This is a reinforcing and more descriptive term for "Alumina."
Corundum is the natural mineral name for crystalline aluminum oxide (Al₂O₃). Rubies and sapphires are gem-quality forms of corundum.
By stating "wear-resistant corundum," the manufacturer emphasizes that the jar is not just made of alumina powder, but is a sintered ceramic with a corundum crystal structure, which is inherently one of the hardest and most wear-resistant materials available for industrial use.
