User manual

Appendix I
ZCast Design Guide - 8
PREPARING AND BAKING MOLDS
WARNING
Bake ZCast molds until all moisture is removed before metal
casting. Residual moisture in the mold can cause the mold
to unexpectedly fail, releasing entrapped gases and molten
metal and causing serious personal injury.
WARNING
Do not bake ZCast molds in unvented ovens. Irritating and
toxic fumes are formed at elevated temperatures during
oven baking. Ovens must be vented to the outside. Refer to
the ZCast 501 powder MSDS for more information on the
irritating and toxic fumes.
CAUTION
Depowdering with compressed air will generate airborne
particles. Only trained or supervised individuals should
depowder a mold. Use hood ventilation and safety goggles
or faceshield to protect the eyes and face. Refer to the
ZCast 501 powder MSDS for more information.
CAUTION
Pouring sleeves attached to the ZCast mold with core paste
may shift while pouring molten metal into the mold. Leaking
of molten metal may cause personal injury. Attach sleeves
with clamps and securing wires as needed.
POURING MOLTEN METAL
WARNING
Do not use ZCast 501 molds with molten ferrous metals or
other metals with pouring temperatures above 1100
o
C
(2000
o
F). The molds can suddenly fail unexpectedly
releasing entrapped gases and molten metal causing
serious personal injury.
WARNING
Do not handle molten metal without heat-resistant
faceshield, gloves and apron and tools suitable for handling
molten metal in foundry operations.
WARNING
Do not handle molten metal without adequate local exhaust
ventilation. Hot gases emitted during the casting process
can burn skin and are irritating and toxic. Refer to the ZCast
501 powder MSDS for more information.
WARNING
Inadequate venting in the mold or core can lead to the
unexpected release of entrapped gases and molten metal
causing personal injury during metal casting. Venting paths
in the mold must be arranged and directed away from the
metal path to avoid entrapment of gases.
CAUTION
Do not cast metal parts in molds with multiple sections
without core paste or adhesive. Molten metal may leak from
the mold seams and cause personal injury. Avoid blocking
vents with paste or adhesive.
CAUTION
Attachment of risers and cups without core paste may result
in the unexpected release of molten metal and personal
injury. Always use core paste or adhesive for attachments.
Additional clamps or securing wires may also be needed.