Subscribe to the EPMA Mailing List

Defects And Extrusion Issues In Powder Metallurgical Pastes Originating From The Thermogelation Of Cellulose Ether Lubricants - Proposals To Solve The Issue

  • : Roland Bayer1
  • : 1Dow Chemical
  • : PDF Download
  • : 2016


Methylcellulose, hydroxypropyl methylcellulose and hydroxyethyl methylcellulose are largely used as plasticizers and lubricants in the paste extrusion of tungsten carbide, steel and other powder metallurgical pastes. The process is performed in aqueous or solvent based media.

While the extrusion process normally runs quite well at very low temperatures, above a certain temperature the extrusion paste gets brittle, the extrusion pressure increases significantly and defects like crack formation occurs. this "temperature window of best processing" is larger or smaller depending on the conditions. We found that the upper temperature limit depends on the cellulose ether gelation temperature. The lecture will explain the different influencing parameters steering the gelation temperature in the formulation up- or downwards. Numerous examples of extrusion pastes will demonstrate the problem and its solution.


Non-EPMA member price shown. If you are an EPMA member please log in for your discount.
If you are logged in as a member but are still seeing this message, please contact us at
If you would like to find out about becoming an EPMA member, click here.
This product is currently only available to purchase via this website to companies with a valid EU VAT Number. If you are an individual or company without an EU VAT number wishing to purchase this, please contact EPMA directly at Alternatively, past Euro PM papers are available via ProQuest and Elsevier.
* This field is required
Go To Top