The IKA Basic Analytical Mill A 11 and the IKA Universal Mill M 20 are designed for carrying out grinding of hard and brittle substances, without releasing dust, and for pulverizing softer, fibrous materials.
Crushing causes the material to be milled to heat up. This may not always be desirable because of oxidation, loss of moisture, evaporation of volatile compounds and other such changes.
The Universal Mill M 20 has a jacketed chamber and hose adapters to circulate cooling water or brine from a tap or circulating bath, and that is usually sufficient for materials that smear when hot or that produce oil.
Substances can also be cooled to make them brittle for grinding if they are relatively soft at room temperature. Dry ice (approximately -78°C) or liquid nitrogen (approximately -196°C) can both be applied in the chamber of the Analytical Mill A 11, but nitrogen cooling for material in the Universal Mill M 20 has to be done outside the unit.
These grinders are designed for bursts of activity, as the motors can overheat, and they have built in protection to prevent damage.
The grinders beaters and blades are replaceable. Fineness is primarily a function of how long the grinding operation is performed, but also depends on the properties of the material and the amount in the chamber.
Many substances can be ground, but in certain cases there is danger of dust explosion as a result of electrostatic charge. Check with the manufacturer IKA if the substances to be ground are not examples published in operating manuals such as grain, barley, corn, malt, pectin, roasted coffee, bark, roots, nutshells, bones, ergot, compressed materials, peat, cellulose, pharmaceuticals, fertilizers, feed materials, spices, resin, potash, seeds, salts, slag. Cutters are for leaves, fibers, spices, grain, hops, cardboard, paper, hay, plastics, tobacco, peat, feed goods, dough and roots, and fish or meat.
Features of the A 11 Analytical Mill:
Features of the M 20 Universal Mill:
|Model:||Analytical Mill A 11||Universal Mill M 20|
|Operating principle:||Impact and Cutting||Impact and Cutting|
|Motor rating input/output: (W)||160/100||620/260|
|Maximum speed: (rpm)||28,000||20,000|
|Circumference speed: (m/s)||53||72|
|Usable volume (maximum): (ml)||80||250|
|Feed hardness maximum: (mohs)||6||5|
|Feed grain size maximum: (mm)||10||7|
|Material beater/cutter:||stainless steel standard A 11.1 supplied||stainless steel standard M 21 supplied|
|Material milling chamber:||stainless steel||stainless steel|
|Power-on time ON: (m)||1||7|
|Power-on time OFF: (m)||10||10|
|Milling chamber, can be cooled with water:||no||Yes|
|Mill feed can be cooled in milling chamber with dry ice:||Yes||Yes|
|SMill feed can be cooled in milling chamber with liquid nitrogen:||Yes||no|
|Dimensions: W × H × D (mm)||85 × 240 × 85||170 × 350 × 170|
|Permissible ambient temperature: (°C)||5 – 40||5 – 40|
|Permissible relative moisture: (%)||80||80|
|RS 232 interface||no||no|