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Cold Mold Rtv Type Silicon Mold Rubber Compound Pewter Tin / Lead Metal Cast Kit For Sale
can make a rubber mold for casting pewter or other low melt alloys without heat and without mixing and
pouring liquids. This 0% shrinkage silicone rubber is a 2-part putty that you
simply knead together and then press into a standard mold frame to cure under
pressure, without heat for 30 minutes. Packaged in two containers, part A and
part B, weighing a total of 1.3 lbs.
Working Time:2 min. (approx)
Cure Time:30 min. (approx)
Tensile Strength:400 psi
Tear Strength:55 ppi
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1- Packaged in two containers, part A and part B Cold Mix
20 - Acorn
Nuts which you will install between the two halves of an unvulcanized rubber mold to
insure the proper orientation of the two halves. Because of their six-sided
configuration, Acorn Nuts have a holding ability superior to any other form of
1- Blade handle shown is used with mold cutting blades.
10 - Mold
Cutting Blades very popular with mold makers for their sharpness
1- Tweezers in the style of the Swiss Boley AA tweezers.
Anti-magnetic stainless steel with very fine points. 5" length.
STEP 1.Prepare at
least 6 brass locators by folding each of the four prongs on each locator
toward the center of the locator. After bending the prongs, press each locator
onto a flat surface so that the prongs are all flush with the table surface.
STEP 2.Weigh equal
quantities of Part A (light blue) and Part B (purple) so that when combined,
they fill approximately half of your mold frame. It is recommended that the
amounts be weighed for accuracy to ensure proper curing of the compound.
STEP 3.Rapidly knead
together Parts A and B until a uniform color is attained. You have a total
working time of approx. 2 minutes, so work quickly. Before proceeding to the
next step, be sure that the compound is entirely mixed with no streaks of
color. Set aside a small amount of compound to fill the locators (step 4).
quickly, press the compound into the mold frame making sure that the compound
reaches the bottom of the frame (the frame should be on top of one of the mold
plates). Position your model in the center of the frame and press it into the
compound until the top edge of the model is nearly flush with the surface of
STEP 5.Fill the
locators with the compound set aside in step 2. Position one locator at each
corner at least 1/8" away from the side walls of the mold frame. Place
your sprue button and rod into position, making sure that the sprue rod is at
least 1/8" away from the model. Press down half-way. As the compound
begins to cure it may be necessary to hold down your model to prevent it from
rising above the surface.
STEP 6.Lightly brush talc
powder or baby powder works fine, over the entire surface of the rubber and
blow off any excess powder from the surface. It is not necessary to wait for
the compound to cure completely before continuing.
STEP 7.Repeat steps 2
and 3, using slightly more compound than is necessary to fill the rest of the
mold frame. Again, make sure that the compound is mixed completely.There
is no need to set aside compound for the locators.
STEP 8.Press the
compound into the mold frame. The top of the compound should be slightly above
the top edge of the mold frame.
STEP 9.Place the
second mold plate on top of the mold frame, pressing the plate down with the
palm of your hand. Although Cold Mold Compound cures without heat, slight
pressure is needed to ensure a good mold. Pressure can be applied to your mold
in any one of the following ways:
approximately 30 minutes under pressure the compound should be completely cured
and the mold can now be removed from the mold frame. Remove the plates from
either side of the frame and push the mold out with your fingers. Using a pair
of scissors, remove the excess compound that has extruded between the frame and
STEP 11.To separate the
mold, simply pull the two halves apart. Remove the model from the mold, flexing
the mold if necessary.
STEP 12.Once the model
is removed, gates are cut into both halves of the mold to join the sprue to the
model cavity. Vents can now be cut into the mold to ensure complete filling
during white metal casting.
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Cold Mold Rtv Type Silicon Mold Rubber Compound Pewter Tin / Lead Metal Cast Kit: $60