Heat Treatment Block Kit
Quantity in Basket:
Catalog No.: BL-KIT
Shipping Weight: 12.00 pounds
Corbin Manufacturing now offers easily-machinable
ceramic foam heat treatment blocks, to make jacket and
bullet holders for bonding cores and heat treating
The new blocks are available both as a simple "kit",
with two ceramic blocks, a drill template, and
instructions, and as individual add-on blocks to
build additional jacket holders or to construct
minature heat treatment furnace enclosures, for use
with an ordinary propane torch.
Bullet makers often wish to bond the core to the jacket,
to prevent separation on impact and provide nearly 100%
retained weight. Although jackets can be "propped up"
against a fire-resistant surface and the lead melted
inside them by applying a propane torch flame (in the
presence of one or two drops of Corbin Core-Bond agent),
it is quicker to use a drilled ceramic block to support
up to 36 jackets at a time (of up to 50 caliber, with
slightly larger than 1/2-inch drilled holes).
A second block resting on its narrow edge forms a
back-stop for the flame, behind the drilled block.
This helps to reflect the flame and heat to the back
side of the jackets, evenly distributing the heat for
a faster melt.
Corbin's special ceramic foam blocks can withstand up
to 2,600 degress (F) and protect the work surface.
Only about 800 to 1000 degrees is required for rapid
melting of the lead core while the bonding flux is
still present as a hot vapor, to effect perfect bonded
cores and to heat treat drawn copper or gilding metal
jackets for better expansion without cracking.
The ceramic blocks are not "hard" in the usual sense,
but can be drilled easily with an ordinary wood drill
(spade bit) or cut with a coarse-tooth hacksaw. This
makes it simple to drill a pattern of 32 half inch
(or smaller) holes partly through the 4-1/2 inch by 9
inch side of the block, to create a high temperature
"holding tray" for bullet jackets.
The blocks are 4.5 by 9 by 2.5 inches high. Drilling
holes one inch deep into them makes an effective, easy
to use holder for nearly any size or length of bullet
jacket. At least 3/8 inch should be left between
adjacent drill holes for strength. The block should be
held firmly but not clamped directly with a c-clamp,
for drilling (it may crack if compressed too firmly
without a wood, rubber, or leather pad under the clamp).
Ceramic Heat Treatment Block
Ceramic Blocks, Pk/10