Technical Forum


Unique Characteristics


General Properties

Post-Machining Treatments

Water Line Sealing

Design Guidelines

Cleaning, Maintenance, and Resin Removal

Porcerax II Insert Installation

Porcerax II Pin Installation

Porcerax II Stock List





General Properties

Machining and Polishing
Porcerax II can be machined by conventional methods using cutoff saws, end mills, grinders, EDM methods, stoning, etc. It is important to remember that this material is honey-combed with thousands of microscopic holes which are affected by metal removal. Oil coolant is recommended.

Average pore size:

7 or 20 microns


25% air by volume

Linear Expansion:

(@68 - 302°F) 6.67 - 6.94 in./in F

Heat transfer co-efficient (at room temperature):

16.93 - 19.35 BTU/ft. hr. F

Tensile strength:

63990-71100 lbs./In2


HMV 350 - 400 (35-40 HRC)

HSS Machinability:




Grinding closes the pores of all grades of this porous steel. Milling will close the pores of 7 micron and reduce the pore size of the 20-micron material down to about 7 microns (when done correctly) by partially closing the pore opening at the surface. Stoning, using a back and forth/side to side method, will re-establish permeability by removing the metal that is crushed over the pores. Stoning and polishing, up to about a number 800 - 1000 stone/paper finish, is possible. During the stoning and polishing process, it is important to occasionally flush the pores at the surface to prevent packing the pores with debris.

Electric Discharge Machining is the best way to re-establish permeability. This method will burn away the metal fragments that are crushed over the pores by milling and/or grinding.

Note: When using wire EDM machining methods, Porcerax II is porous and generates waste particles that can create "arcing" conditions between the wire and the work-piece. This arcing can cut the wire. As a countermeasure, increase wire winding speed.

Note: When using an electrode for EDM, it is important to program a peak-to-valley burn rate that exceeds the pore size; i.e. < 7 micron depth for 7 micron pore size is desirable. 

The illustrations above show how particles created by the wire EDM process carry the electrical current across to the work-piece, creating the potential for a discharge that can break the wire. Increasing the wire winding speed not only greatly reduces the potential for wire breakage but also increases machining times.


NOTE: All technical and engineering data and suggested procedures, specifications and applications contained in this publication are for general information only. Sintokogio, Ltd. International Mold Steel and/or their distributors disclaim any and all express or implied warranties of merchantability, suitability for any particular purpose or use, or freedom from infringement of any patent, trademark or copyright. Porcerax II® is a registered trademark of International Mold Steel, Inc. and Sintokogio, Ltd.

                       HOME  |  ABOUT US  | SEARCH  |  CONTACT US 1-800-625-6653
International Mold Steel, Inc. is a licensed distributor of Porcerax II, a SINTOKOGIO,LTD. product. International Mold Steel, Inc.  
6796 Powerline Drive
Florence, KY  41042  USA
Tel: (859) 342-6000 or  1-800-625-6653   
Fax: (859) 342-6006 
Literature: info@imsteel.com
Sales Desk: salesdesk@imsteel.com

Copyright 2006-2017 International Mold Steel, Inc
Web site published by Marketing Options, LLC