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Carbon rods
Graphite is the stable form of carbon. Graphite is one of the softest; diamond is one of the hardest minerals known to man. Carbon is harder than graphite. For TEM and SEM applications, graphite is recommended.
Carbon /graphite films are most usable in TEM and SEM due to its value characteristics: uniformity amorphous and high transparent to electron beams. Because of low molecular weight and their unique structure (graphite have a sheet like structure, where the atoms all lie in a plane), carbon/graphite films have excellent mechanical stability, and even film thickness is about 1 - 2nm.
These carbon/graphite rods are CVP (Chemical Vapour Process) purity and spectrographic grade, grade 1, produced to ASTM tolerances or even tighter as well we have a technical grade. The technical grade has a typical impurity level of 50ppm or greater. Technical grade may be used in applications of non critical SEM coating applications.
Spectro-Grade Carbon Rods (graphite) have an impurity level of 2ppm or less with a maximum level element of each of 1 ppm. These rods are ideal for all TEM, SEM and all other critical applications.
Properties:
Name | Carbon |
Symbol | C |
Atomic number | 6 |
Atomic weight | 12.0107 |
Group number | 14 |
Period number | 2 |
CAS I.D. | 7440-44-0 |
Block | p-block |
Specific gravity (graphite) | 2.2 g/cm3 |
Specific gravity (diamond) | 3.51 g/cm3 |
Specific gravity (amorphous) | 1.88 g/cm3 |
m. p. sublimes | ~3550°C |
Boiling point | 4200°C |
Evaporation Temp (at which a substance has a vapour pressure of 1.33 x 10-2 mbar) | 2400°C |
Density | 1.85 g/cc |
Shore Scleroscope Hardness | 45 |
Resistivity Ohms-in | 4.0 x 104 |
Ash Content | <2 ppm |
Flexural Strength | 8000 lb/in2 |
Porosity | 16.5% |