Products used in this How To:
Tape Mold - Casting a Piece
are going to pressure cast this part using Alumilite’s
Flex 60 with blue dye added to it. The Flex 60 is a 1:1
urethane elastomer that cures to a 60A hardness that is similar
to the hardness of car tire rubber. It has a 5 minute work
time and a 1 hour demold time. So start by measuring out
equal amounts of the Flex 60 A & B and then add Alumilite’s
the material thoroughly. Be sure to scrape the sides and
the bottom well.
a vacuum chamber and pump, degas the Flex 60 to remove all of
the mixed in air.
a large plastic syringe (found at local medical supply companies),
suck up the degassed Flex 60 into the syringe which will allow
you to inject the resin into the mold rather than trying to pour
inject the Flex 60 into the large pour hole.
the resin flow through the mold until it is completely filled.
the mold if necessary to flush air pockets out of trapped areas
of the mold.
the reservoir completely and place the entire mold into your
Alumilite Pressure Pot.
the pressure pot with 40 psi and allow the part to cure under
pressure (approximately 30-60 minutes depending on mass).
Once cured, remove from the pressure tank and open the mold.
the flash from the cast Flex 60 piece and you have a perfectly
cast replica of your SLA original.
Notice the flexibility demonstrated in the cured Flex 60 casting.