Purity of graphite layer

ash content

%

< 4

chloride content

ppm

< 50

Initial density

of graphite layer

g/cm³

1.0 - 1.1

Residual stress acc. to DIN 52 913

16 h, 300 °C

N/mm²

> 45

Compressibility and recovery
acc. to ASTM F 36, procedure J

compressibility

%

15 - 25

recovery

%

> 20

Sealability against nitrogen

acc. to DIN 3535, part 6 (FA)

mg/(s·m)

< 0.1

Swelling acc. to ASTM F 146:

in IRM 903 Oil (replaces ASTM Oil No. 3)
5 h, 150 °C

increase in thickness

%

< 5

in ASTM Fuel B
5 h, room temp.

increase in thickness

%

< 10

Operating temperature

in inert or reducing
atmosphere

up to the operating limits of the core material used

in air

°C

-200 up to +450

Operating pressure (max.)

at 450 °C

bar

100