Vitreous carbon and carbon (graphite) planchets are ideal substrates for X-ray analysis and backscattered electron imaging in a SEM or electron microprobe. The spectroscopically pure carbon discs provides an excellent conductive, low emission X-ray background free of any characteristic X-ray peaks except carbon. Carbon planchets are favored over the non-conductive diamond planchets (charging will have negative effects on the analytical results and can distort X-ray mapping and imaging).
The vitreous carbon and carbon (graphite) planchets can be cleaned and used again. For fine powders and imaging applications the vitreous carbon is the best choice. For X-ray applications of larger particles or specimens or for applications where the planchets can not be used again, the carbon (graphite) planchets are adequate.

vitreous carbon (graphite) planchetvitreous carbon (graphite) planchetvitreous carbon (graphite) planchet

Physical Properties of Vitreous Carbon
Maximum Service Temperature (vacuum or inert gas) 3000°C
Density 1.42 g/cm³
Open Porosity 0%
Permeability Coefficient 10-9 cm²/s
Vickers Hardness 230HV
Flexural Strength 260 MPa
Young's Modulus 35 GPa
Compressive Strength 480 MPa
Electrical Resistivity (30°C) 45Ωµm
Thermal Conductivity (30°C) 6.3 W/(Km)
Expansion Coefficient (20-200°C) 2.6 x 10-6/K

Vitreous Carbon Planchet

Lapped surface on one side for smoothness, also known as glassy carbon or glass-like carbon. For analytical SEM/EDX, X-ray analysis and chemical analysis applications.

Vitreous carbon is an advanced materials of pure carbon combining glassy and ceramic properties with those of graphite. Impermeable to gases and liquids, high purity, corrosion resistant, thermal stability in air up to 600°C and in vacuum or inert gas up to 3,000°C. Good electrical conductivity, low thermal expansion and extreme resistance to thermal shock. Hard and strong (hardness = 230 HV1). Applications in the fields of chemical analysis, metallurgy, crystal growth, medical technology and in glass and ceramics research. MSDS (95KB PDF)

High purity vitreous carbon with impurities less than 30ppm total.
Typical chemical analysis of these vitreous carbon planchet is:

Al 0.270   Cu 0.030   Sn 0.440
Ba 0.081   Fe 0.920   Si 13.860
Be 0.044   K 0.340   Sr 0.061
Bi 0.050   Mg 0.052   Ti 0.096
Ca 9.710   Mn 0.041   V 0.044
Cd 0.044   Mo 0.044   W 0.089
Co 0.089   Na 0.780   Zn 0.044
Cr 0.091   Ni 0.120   Zr 0.062

Prod # Description Unit Price Order / Quote
16524 High Purity Vitreous Carbon Planchet 12.7mm dia. x 2mm each $113.00
16526 High Purity Vitreous Carbon Planchet 25mm dia. x 3mm each 148.00
16528 High Purity Vitreous Carbon Planchet 32mm dia. x 3.2mm each 184.00

carbon planchets for JEOL, Hitachi, pin stubs

Properties of Grade 1 Carbon
Density 1.58 - 1.63 g/cm³
Hardness 30 - 35 Shore
Electrical Resistivity 58 - 71 Ωµm
Flexural Strength 24 - 31 MPa
Tensile Strength 22 MPa
Compressive Strength 48 MPa
Thermal Expansion 1.9 x 10-6/°C
Porosity 28 - 30%
Purity Impurities < 2ppm

Carbon Planchets

Spectroscopically pure carbon Grade 1 (graphite) planchets with total impurities equal to or less than 2ppm with each single element 1ppm or less. Trace elements can be Si, Al, Fe, Mg, Ca or B. The carbon discs have a fine ground finish on one side; 0.80µm (32µ inches). All carbon planchets are 1.6mm (1/16") thick. Sizes from 10 to 32mm diameter to fit all styles of SEM pin and cylinder mounts varying from 10 to 32mm diameter.

Prod # Description Unit Price Order / Quote
16504 Carbon Planchets, 10mm, for JEOL 10mm mounts pkg/10 $13.30
pkg/100 123.00
16500 Carbon Planchets, 12.7mm, for pin stubs pkg/10 16.50
pkg/100 149.00
16505 Carbon Planchets, 15mm, for Hitachi and ISI/ABT/Topcon mounts pkg/10 14.50
pkg/100 135.00
16508 Carbon Planchets, 18mm, for 18mm pin stubs pkg/10 14.00
pkg/100 130.00
16510 Carbon Planchets, 25.4mm, for large pin stubs, JEOL metallographic mounts and Hitachi 25mm mounts pkg/10 22.00
pkg/100 209.00
16512 Carbon Planchets, 32mm, for large pin stubs, Hitachi and JEOL mounts pkg/10 34.50
pkg/100 323.00

Highly Polished Carbon Planchets

Highly Polished Carbon Planchets

The highly polished carbon planchets have a smooth, virtually mirror finish on one side with a surface roughness of 0.05 to 0.01um. The material for the cabon discs is spectroscopically pure carbon Grade 1 (soft graphite) with total impurities equal to or less than 2ppm with each single element 1ppm or less. Properties same as Carbon Planchets above. The polished planchets are 1.4 to 1.5mm (0.055" to 0.06") thick. Available in the popular 12.7mm (1/2") and 25.4mm (1") diameter.

Prod # Description Unit Qty Price Order / Quote
16500-P Highly Polished Carbon Planchets, 12.7mm diameter each 1-9 $20.00
10+ 18.50
16510-P Highly Polished Carbon Planchets, 25.4mm diameter each 1-9 24.50
10+ 22.50

Carbon Discs on Pin Stubs

Carbon Discs on Pin Stubs

Carbon planchets with a 1.6mm thickness mounted on standard pin stubs, supplied in the #16709 pin mount storage box. Convenient and ready to use. Provides a durable and economical solution for SEM/EDS microanalysis or low emission surface backscatter imaging applications needing light element surface. Surface roughness of the carbon discs is 0.05-0.01um, material is spectroscopically pure carbon with total impurities less than 2ppm. The aluminum stub underneath the carbon disc provides more rigidity that the carbon stubs. Available for 12.7, 18 and 25.4mm (1/2", 0.7" and 1") pin stubs. Sold in storage box with 10 of the 12.7mm pin stubs and 8 of the 18 or 25.4mm pin stubs.

Prod # Description Unit Price Order / Quote
16530 Carbon Discs Mounted on 12.7mm Pin Stubs, Box of 10 each $44.50
16532 Carbon Discs Mounted on 18mm Pin Stubs, Box of 8 each 54.50
16534 Carbon Discs Mounted on 25.4mm Pin Stubs, Box of 8 each 54.50