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SPECIALTY GRAPHITE GRADE DESCRIPTION
Extruded Graphite Grades
Mini Rods (GMMR-50 & GMMR) : Fine grain extruded graphite small diameter rods. Diameters ranging from 3 mm to 65 mm with a maximum particle size of 0.2 mm. Mini rods are manufactured in two grades GMMR - 50 and GMMR. GMMR-50 is used for general applications. GMMR is a denser version of GMMR-50 used for applications requiring higher strengths and lower porosity.
Nominal
Size of unmachined Mini rods
| Inches |
Millimeters |
| Dia |
Length |
Dia |
Length |
|
|
|
|
| 1/8 |
12 |
3 |
300 |
| 1/4 |
12 |
6 |
300 |
| 3/8 |
12 |
10 |
300 |
| 1/2 |
12 |
13 |
300 |
| 1/2 |
24 |
13 |
610 |
| 5/8 |
12 |
16 |
300 |
| 5/8 |
24 |
16 |
610 |
| 3/4 |
12 |
19 |
300 |
| 3/4 |
24 |
19 |
610 |
| 1 |
12 |
25 |
610 |
| 1 |
24 |
25 |
300 |
| 1 |
36 |
25 |
915 |
| 1 |
48 |
25 |
1220 |
| 1.1/4 |
12 |
32 |
300 |
| 1.1/4 |
24 |
32 |
610 |
| 1.1/4 |
36 |
32 |
915 |
| 1.1/4 |
48 |
32 |
1220 |
| 1.1/2 |
12 |
38 |
300 |
| 1.1/2 |
24 |
38 |
600 |
| 1.1/2 |
36 |
38 |
915 |
| 1.1/2 |
48 |
38 |
1220 |
| 1.3/4 |
12 |
45 |
300 |
| 1.3/4 |
24 |
45 |
610 |
| 1.3/4 |
36 |
45 |
915 |
| 1.3/4 |
48 |
45 |
1220 |
| 2 |
12 |
50 |
300 |
| 2 |
24 |
50 |
610 |
| 2 |
36 |
50 |
915 |
| 2 |
48 |
50 |
1220 |
| 2.1/2 |
12 |
65 |
300 |
| 2.1/2 |
24 |
65 |
610 |
| 2.1/2 |
36 |
65 |
915 |
| 2.1/2 |
48 |
65 |
1220 |
Typical
Properties of graphite
Mini rods
|
|
(Metric units) |
| Grade |
GMMR
- 50 |
GMMR |
| Max Particle
size
mm |
0.25 |
0.25 |
| Apparent Density
g/cc |
1.66 |
1.74 |
| Hardness Rockwell
"R" |
40 |
55 |
| Porosity,
% |
18 |
12 |
| Electrical Resistivity
micro ohm-m |
10 |
10 |
| Modulus of rupture
N/mm² |
22 |
28 |
| Tensile Strength
N/mm² |
13 |
16 |
| Compressive
strength
N/mm² |
30 |
38 |
| Modulus of elasticity
10-³ N/mm² |
11 |
19 |
| Thermal Conductivity
W/m°C |
160 |
180 |
| Coefficient
of thermal expansion
10-7 °C |
6.9 |
7 |
|
|
( British
units) |
| Grade |
GMMR
- 50 |
GMMR |
| Max Particle size,
inch |
0.01 |
0.01 |
| Apparent Density,
Ib/ft³ |
104 |
109 |
| Hardrness Rockwell,
"R" |
40 |
55 |
| Porosity,
% |
18 |
12 |
| Electrical Resistivity,
x10-5 ohm.in |
39.4 |
39.4 |
| Modulus of rupture,
psi |
3191 |
4061 |
| Tensile Strength,
psi |
1885 |
2331 |
| Compressive strength,
psi |
4351 |
5511 |
| Modulus of elasticity,
x10-6 psi |
1.6 |
2.8 |
| Thermal Conductivity,
BTU/ft.h.°F |
92.5 |
104 |
| Coefficient of thermal expansion,
x10-7/°F |
3.8 |
3.88 |
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