I have been sporadically following the Palladium thread and thought
I might post some data for you. Palladium is a Platinum family metal
and does behave a lot like Platinum. Hoover & Strong has a patent
pending 950 Palladium product called Tru-Pd(tm) that is a unique
alloy that can be used for all manufacturing techniques. We use the
same alloy for casting, die striking and drawing. To quote our Mill
and Refining Director, Stewart Grice:
"I would like to point out that palladium alloys do not need to be
tuned for specific purposes, and that "the best casting alloy is
different than the best fabrication alloy", is not necessarily true.
Hoover & Strong is the sole supplier of TruPd99, which is a patent
pending, general purpose 950 palladium alloy that is excellent at
both investment casting and as a mill product. There are no cracking
problems with this alloy, it is malleable, ductile, and once the
investment casting parameters are tuned in, gives porosity and
We do not sell different alloys for different purposes because we do
not need to. As any jeweler knows, using the same alloy for both
purposes gives several distinct advantages. versatility, and above
all color match. If you don't have enough casting grain for your job,
when the alloy composition is identical, you can use some
fabrication scrap to make up the weight. Conversely, you can use some
casting sprue to fabricate some sizing wire if needed. Versatility
and complete color match.
While I'm sure that other 950 palladium alloys are excellent at
specific tasks, TruPd masters ALL fabrication techniques."
ALLOY NAME 950 Palladium "TruPd"
ALLOY COLOR White
ALLOY DESCRIPTION General purpose
PRODUCT FORMS AVAILABLE Casting grain, flat sheet,round wire, sizing
wire, shape wire, pattern wire, bezel strip & wire, findings, ring
RECOMMENDED USES 950 palladium is suitable for all general
fabrication techniques. It can withstand high levels of deformation
between anneals. This alloy does not require rhodium plating.
Working: For best results, H&S recommend 950 palladium is reduced by
a minimum of 50% area/section thickness between anneals.
Annealing: If using a furnace, anneal between 1650 - 1832 F (900 -
1000 C) for 15 30 minutes depending on size. If using a torch, heat
to an orange color. This alloy can be quenched after annealing.
Investment casting: Melting range: 2462 - 2516 F (1350 - 1380 C).
Casting temperature range: 2820 - 2910 F (1550 - 1600 C).
Flask temperature range: 1250 - 1350 F (675 - 730 C).
Investment type: Platinum (phosphate bonded).
Cover gas: Argon.
Tru-Pd must be cast using similar techniques to platinum alloys due
to the high melting range of the alloy. Sprues and gates must be
typical of those used for platinum castings.
Tru-Pd must be melted under an argon protective atmosphere to
prevent gas absorption. It is recommended that induction casting
equipment with a sealed melt chamber be used. Ideally the melt
chamber should be vacuumed after loading the charge, and then
back-filled with argon. If an open crucible is used, care must be
taken to ensure complete cover with argon. While it may be possible
to successfully cast Tru-Pd using a torch, results cannot be
guaranteed. Temperatures may differ from these recommendations
depending on processing considerations.
After casting, the flask may be quenched and de-vested once the
button has returned to black heat. Final de-vesting may use
techniques standard to platinum alloy processing.
Soldering: Standard soldering techniques may be used with 950
RECOMMENDED SOLDERS H&S palladium hard, medium and easy solder.
MATERIAL PROPERTIES Melting range: 2462 - 2516 F (1350 - 1380 C)
Specific gravity: 11.84
Density: 6.24 troy ozs/in3
Hardness: Cast 115 HV
We have technical advisors that can help you fine tune the use of
this new metal. Our brochure also has a lot of technical
Please call 800-759-9997 to order one.
I hope this is helpful.
Eugene C. Gentile (Gino)
National Accounts Manager
Hoover & Strong, Inc.
295 Princeton-Hightstown Road
West Windsor, NJ 08550