Plastic Mold Steels
Heat treating of Porcerax II should be done in a vacuum furnace. As supplied,
Porcerax II has a hardness of 35-40 HRC. It can be heat treated to 50-52 HRC;
however, Porcerax II carries a fairly high potential for movement. Strict
guidelines are supplied by International Mold Steel and should be followed.
Porcerax II is 25% porosity by volume and will give false or misleading readings
if tested with either a Rockwell or Brinell hardness tester. As the load of
either of these testers is applied, the pores beneath the surface will collapse
and render a false reading. It is recommended that a micro Vickers hardness
tester (50 or 30g load) be used to test the hardness of Porcerax II.
Porcerax II (7 micron grade) can be textured. In order to prevent the
possibility of destroying the internal vent structure of the material, certain
procedures must be strictly adhered to. It is imperative that the chosen texture
source know they are working with Porcerax II. If they don't, the likelihood for
permanent, irreparable damage to the piece is virtually assured.
The pores of the material must be thoroughly cleaned and properly sealed prior
to texturing. Failure to do so results in the etchants used in the texturing
process leaching into the pore structure and rusting the venting closed. This
rust is permanent and cannot be removed once it has occurred. The piece will be
useless and must be replaced.
Thousands of molds worldwide have been successfully textured. However, it is
imperative that the molder and/or moldmaker's texture source be supplied with
the information needed from International Mold Steel to properly process the
We strongly advise against inserting Porcerax II into an already textured
surface. The perfect venting of Porcerax II results in much higher resolution of
the grain at the inserted area and a dramatic reduction in gloss. It is
recommended that the entire textured surface be Porcerax II. Also, due to the
pre-treatment procedure required for texturing Porcerax II, expect longer
deliveries and higher costs. Please consult your graining source for more
Porcerax II provides perfect venting of all gases from the mold. While this is
desirable in most cases, the venting of the Porcerax produces a perfect
"marriage" between the resin and the molding surface, thus producing a dull,
matte finish. If Porcerax II is used as an insert on the cavity side, the result
will be two dissimilar appearances due to differences in gloss and texture
definition. This may be acceptable if the parts are painted after molding.
Occasionally the need will arise, due to size or application considerations, to
water-cool Porcerax II. There are a number of ways to accomplish this. In
designs that involve a straight-through water line pattern, a simple, effective
way to seal the line and prevent leakage is electroless-nickel plate the water
lines. In complex circuit-type patterns, it is advisable to use an acceptable
sealant such as Dichtol. Electroless nickel has a tendency to pull away from
sharp corners such as those at intersections of crossing water lines. However
minutely this pulling away from corners may be, it will eventually cause some
leakage into the material and reduce permeability through oxidation. Improper
use of the Dichtol sealant will produce the same results. Regardless of which
sealing process is used, be absolutely certain the material has been thoroughly
cleaned of any residual machining fluids or other contaminants.
It is imperative that anyone coming into contact with Porcerax II during the
mold building or molding operations understand the characteristics and
sensitivity of this material. Any questions should be directed to International
Mold Steel at 1.800.625.6653.
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..