IKA MultiDrive MI 250.1 Standard Hammer, Stainless Steel, 0020023166

Kinetics of high-speed impact comminution

In demanding inorganic analysis, geochemistry and pharmaceutical quality control, the physical comminution of hard and brittle sample matrices (such as minerals, ceramics, tablets or cereals) is the fundamental first step in the process. The IKA MultiDrive MI 250.1 standard grinding tool operates according to the process principle of impact and shock comminution. Driven by the MultiDrive base station at up to 30,000 revolutions per minute, the rotating stainless steel beater generates immense peripheral velocities at its outer edges. The massive kinetic energy generated in this process is transferred directly to the sample material in fractions of a millisecond. This extreme mechanical impulse overcomes the material’s internal tensile and compressive strength, leading to the immediate, abrupt shattering of the crystal lattices and macroscopic structures.

Particle kinematics in the enclosed grinding chamber

The fragmentation of dry samples requires controlled kinematics within the grinding chamber. The specific geometry of the MI 250.1 beater is physically precisely matched to the radius of the 250-ml grinding chamber. Due to the high-speed rotation, the particles are not only struck by the beater itself, but are also hurled with enormous acceleration against the stainless steel wall of the chamber, where they are further comminuted by additional impact energy. This continuous kinetic cycle of impact and rebound results in a highly homogeneous, reproducible particle size distribution in the analytically relevant micrometre range, without the formation of fluid dynamic dead zones.

Material integrity and abrasion resistance

When processing materials with a high Mohs hardness, the grinding tool is subjected to massive tribological stresses (wear caused by friction and impact). To physically minimise sample contamination by metallic abrasion (carry-over), the MI 250.1 beater is manufactured from a highly wear-resistant, solid stainless steel. This single-material design guarantees exceptional structural integrity, even during continuous intermittent grinding. For laboratories operating under strict GLP (Good Laboratory Practice) guidelines, the smooth, seamless metal surface enables thorough decontamination and residue-free thermal sterilisation in an autoclave.

Technical details

• Product type: Standard beater (replacement / interchangeable tool)
• Processing principle: Impact milling
• Physical scope of application: Dry grinding of hard and brittle matrices
• Compatibility (vessel): Suitable exclusively for the IKA MultiDrive MI 250 (including the T version)
• Compatibility (drive): IKA MultiDrive basic and MultiDrive control
• Material: Solid, highly wear-resistant stainless steel
• Installation: Tool-free, form-fit replacement in the grinding vessel
• Cleaning and hygiene: Fully autoclavable and chemically sterilisable

Contents

• 1 x IKA MultiDrive MI 250.1 standard beater (stainless steel)

(Important note: The MultiDrive drive unit and the MI 250 grinding chamber are not included in the scope of delivery!)

Customised requirements & accessories

The MI 250.1 beater is the primary wear part in impact grinding. Despite the extreme hardness of the stainless steel, the continuous grinding of highly abrasive samples (such as quartz sand or ores) inevitably leads to gradual blunting and deformation of the striking edges. To maintain the thermodynamic efficiency and kinetics of the grinding process at the standardised laboratory level in the long term, regular replacement of the tool is essential. Please contact our procurement service at any time for the strategic procurement of consumables.