Stratoplex ASP II

The Stratoplex ASP air classifier has long been a guarantee for high performance in the fine to medium-fine separation range. In close cooperation with our customers, we have improved the classic once again. The result: an optimised machine concept with reduced wear and lower energy requirements.

  • Air classifier for high throughputs in the fine to medium-fine separation range of d97 = 10 to 150 µm
  • High fines yield at high precision of cut and high loading
  • Wear protection through ceramic coating on both sides
  • Low energy demand

Excellent flow behaviour

For higher fineness at the same speed

Small change, big effect: The following advantages result from an optimised design of the ASP II: To achieve the same fineness, the speed can be reduced by up to 20 % compared to the previous model. This means: Compared to the previous model, the Stratoplex ASP II has lower energy consumption and less wear. However, if the speed remains the same, the optimised separator wheel can separate more finely. By changing the classifier wheel, finenesses are now possible that could not previously be achieved.

ASP II 315 400 500 630 800 1000 1250 1500
Drive (kW) 5,5 11 15 30 45 55–75 75–100 90–160
Speed (1/min) 800–
Nominal air volume flow
2.500 4.000 6.300 10.000 16.000 25.000 40.000 64.000
Fineness d97 (μm)* 12 13 14 16 17 19 21 23
Fineness d97 air volume
reduced to 80 % (μm)
10 11 12 14 15 17 18 20
*Reference material limestone with density 2,700 kg/m³

Because the drive of the Stratoplex air classifier is fitted underneath the classifying zone and the feed product is fed centrally from above, the result is an optimum distribution and dispersion of the product. The feed product is charged by means of the feed unit via the product intake to the centrifugal plate of the classifying wheel, where it is distributed uniformly and then catapulted radially towards the baffle ring. The feed material is deflected by the baffle ring and routed downwards into the classifying zone.

The classifying air enters the spiral housing and flows through the helical vanes of the vane ring and the classifying wheel in centripetal direction. The fines portion is removed thereby from the feed material as it gravitates downwards in the classifying zone, i.e. the zone between the vane ring and the classifying wheel.

The fines, extracted as a function of the cut point set on the classifier, are entrained in the classifying air and flow towards the fines discharge. The fines must be separated from the classifying air in a downstream collection device (cyclone, filter). The coarse material is rejected by the classifying wheel and falls into the lower section of the classifier as the result of gravity.

The coarse material discharge must be air-sealed by means of a rotary valve. Rinsing air, either drawn in automatically or supplied under pressure, prevents unclassified product from migrating into the fines through the gap between the classifying wheel and the labyrinth seal. The classifying wheel is usually driven via a V-belt drive with a fixed transmission ratio; the classifier speed can be set by means of a frequency converter. The classifier is delivered complete with filter, fan and cyclone.

The classifier ASP II can be operated in the following modes:

  • Through-air mode
  • Circuit-air mode with approx. 10 % leakage air

The compact and modular design of the Stratoplex air classifier results not only in maximum performance at modest dimensions, but also permits an easy and space-saving system configuration. And because most of the main components can be accessed easily from above, Stratoplex air classifiers are quick and easy to maintain.


The air classifier Stratoplex ASP II is used above all for processing feldspar, quartz, nepheline, wollastonite, etc.

Upgrade now to ASP II!

You already have an air classifier Stratoplex ASP in use? Then your air classifier can easily be converted! Contact our service BLUESERV to learn more!

Brochure ASP II

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