SPI Supplies^® Brand Pyrolytic Graphite Planchets

With unique wetability characteristics

The SPI Pyrolitic Graphite Planchets are a far higher quality product than "ordinary" pyrolytic graphite coatings on a more regular type of graphite substrate. While there might be some controversy as to just how really "ordered" is this material, there is no question that the slow growth in one direction and high crystallinity result in a growth situation that excludes the normal kinds of impurities typically found in more ordinary pyrolytic graphite. There is also a far higher level of "order" to the resulting material, and while it surely would not be considered "single crystal" it is far more ordered because of the almost columnar growth from a substrate.

The particular type of pyrolytic graphite offered presently by SPI Supplies is of the type that is "substrate nucleated" or sometimes referred to as "SN Grade". This is separate and distinct from another form of the product called "continuously nucleated" or "CN Grade".

Furthermore this "special unique form of" pyrolytic graphite can be diamond polished into a truly "glass-like" mirror reflective surface.

The low Bremsstrahlung background radiation alternative:
Most forms of carbon have associated with them high background radiation levels in an EDS spectra, thereby reducing the sensitivity for a high precision analysis. A good alternative would be the SPI Diamond Planchets, since carbon in the form of diamond has a very low level of Bremsstrahlung radiation, and approaches that of beryllium.

Cleaning for reuse:
We realize that these pyrolytic graphite planchets are expensive and should not be treated as a consumable. One can carefully remove the sample, and then re-polish on a standard metallographic polishing table, using diamond paste down to 1 µm diamond. If there are scratches or gouges, one might have to start with a larger size diamond paste (or slurry).

Physical description:
Two thicknesses are available both 25.4mm diameter. Almost always reusable with proper cleaning.

	SPI#	each	10+, ea	30+, ea	In Stock
3.2mm thick	428GP-AB	$ 150.00	$ 135.00	$ 127.50	Yes
1.6mm thick	427GP-AB	132.00	118.80	112.20	Yes

StudenTek™ Polished Planchets:

Not all our polished planchetes make through our operation. Small chips sometimes occur at the edges, or a small internal flaw in the graphite crystal is noted. Usually these problems are not noted until the completion of the final polishing step. Rather then toss these otherwise good planchets away, we can now offer them at a reduced price. These are in as-is condition, though they all will have the same high quality polished finish as the standard product on almost all of the surface, so most of the surface area is quite suitable for sample preparation.

Two thickness are available, both 25.4mm in diameter.

	SPI#	Each	10+, ea	30+, ea	In Stock
3.2mm thick	428GPST-AB *	$ 45.00	$ 40.50	$ 38.25	Yes
1.6mm thick	427GPST-AB *	39.60	35.64	33.66	Yes

* AVAILABLE WHILE SUPPLIES LAST

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SPI Supplies® Brand Pyrolytic Graphite Planchets

SPI Supplies^® Brand Pyrolytic Graphite Planchets