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  The Testing Center provides basic information necessary in designing and controlling a dry powder compaction process. The tests are also used for evaluation and quality control of powders not destined for compaction. The testing capability covers a wide range of powders: metallic, ceramic, refractories, nuclear, pharmaceutical, abrasives, explosives, chemicals and others. A pressure holding option accommodates powders that require time for internal reactions. The testing process is computer controlled and automated. A typical test takes less than 10 minutes (for cold dies) allowing testing for direct quality control on production lines.

The new Powder Testing Center Model PTC-04DM offers all the features of the older PTC-04DT and PTC-03DT versions. The main difference is that the unit can be separated into 3 modules: testing and control module, power module, and bulk powder testing module. Each of the modules is light and can be shipped for service as an ordinary small package. The bulk powder testing module is an independent unit and can be used by itself in determining bulk powder properties: angle of repose, bulk density, tap density, room humidity and temperature.

 The new software program provides a user interface that is almost identical to all other versions of the PTC program. The program automatically creates and stores test data files (tables and figures data) in the csv format for spreadsheets.

We offer an Upgrade Kit for all older versions of the PTC.

Tested Powders: all types of powders

Load Capacity: 10 metric tons

Pressing Capacity: 3,210 MPa (225 TSI)

Die Temperatures: up to 300oC (570 F)

Powder Sample: approximately 30 cm3

Die Diameters: 6.35-19.05 mm (0.25-0.75")

Compact Length: 2-16 mm (0.08-0.630")

Controlled by: PC with MS Windows

Size: 180-584-279 mm (7.1-23-11 inches)


Powder Testing Center Model PTC-03DT

Test Time:

Below 10 minutes

Test Data

  • angle of repose

  • bulk density
  • tap density
  • compactibility
  • die friction
  • ejection properties
  • ejection energies
  • green expansions
  • axial strength
  • energy at fracture
  • radial strength
  • diametral strength
  • cohesiveness
  • room humidity and T


  • Test compaction characteristic: pressing pressure, net (isostatic) pressure, closing punch pressure

  • Compactibility coefficient variations with green density
  • Slide coefficient variations with green density
  • Ejection characteristic for the test compact
  • Axial crushing characteristic for the test compact
  • Radial crushing characteristic for the test compact
  • Diametral crushing characteristic for the test compact
  • Compaction characteristic
  • Isostatic compaction characteristic
  • Local pressure distribution in arbitrary compacts
  • Local density distribution in arbitrary compacts
  • Local shrinkage perpendicular to pressing direction
  • Local shrinkage parallel to pressing direction.



  • Fixed Compact Density/Length - pressing to a desired in-die average compact density or length

  • Fixed Punch Pressure - pressing to a desired maximum pressing pressure.

  • Fixed Net Pressure - pressing to a desired net (isostatic) pressure.

  The pressing position and pressure are controlled by a high precision gauges. A motor brake stops the compaction at a desired point. The final pressure may be held for a selected time period before release. For hot pressing, the die (with or without the powder) is heated to the desired temperature immediately before the compaction.


  • Cold Pressing Test Die. It may be solid, with inserts, or surface coated. Dies made of different materials are used for friction optimization. The mounting of a die in the test unit takes approximately 5 minutes. This die may be used in WARM PRESSING at up to 70oC (160 F) with a band heater and a temperature sensor.

  • Cold/Hot Adaptable Test Die. This die consists of a mounting head with supporting hardware and interchangeable die cylinders. The cylinders are shielded with ceramic insulator bushings. These dies can test continuously at any temperatures up to 300oC (570 F). This die type is the most convenient and inexpensive setup for die material optimization and lubrication studies.



Powder Quality Control:

- direct in-line quality control of powder after mixing and before pressing. If tested parameters are out of predetermined limits, the powder is remixed or rejected.

- control of a lubricant content in a powder mixture

- control of a binder content in a powder mixture

Development & Optimization:

- determination of an optimum average green density for new compacts and powders

- determination of an optimum lubricant and binder content

- determination of an optimum die material to minimize friction

- optimizing die temperature effects

R & D:

- new powders and mixtures

- temperature effects on pressing

- optimizing die materials

- die surface coatings

- improving lubricants and binders

- improving product quality

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