NANMAC's
NC-12 protection tube is a dense, sintered ceramic especially
designed for use in many molten non-ferrous metals and corrosive
chemicals. It is very strong, thermally shock resistant
and dimensionally stable. Additionally NC-12 is vacuum-tight
and it has high electrical resistance. Mechanical strength
is retained at extremely high temperatures (over 1000C in
air). These features together with very low wear resistance,
makes NC-12 an ideal Thermocouple protection tube for applications
such as molten aluminum, lead, tin and zinc. Preheating
is not necessary because NC-12 has very low thermal expansion
coefficient.
NANMAC'S
NC-12 Protection tubes are also recommended for
use in oxidizing environments to 2200 Deg. F. Most acids,
such as hydrochloric, nitric, sulphuric, and phosphoric,
do not attack NC-12. This material is also resistant to
hydrogen gas. It is not recommended for use with caustic
solutions and hydrofluoric acid.
Information
about corrosion resistance and melting points of different
materials can be found in the Resource Center.
NOTES:
•
Standard units come with an ANSI-K Thermocouple installed.
•
For Duplex units or other calibrations, contact
factory.
•
Standard support tube is 5" long stainless steel.
This support tube is of universal design. It either 1
inch or 1-1/4 inch NPT pipe threads (depending on length
of protection tube), wrench flats for ease of installation
and can also accept flanges. Longer length support tubes
are available,
contact factory
Typical
Test Results of NC-12 Resistance to Molten Metals
Material |
deg.
F |
deg.
C |
Holding
Time in Hours |
Remarks |
| Aluminum |
| Lead |
| Tin |
| Zinc |
| Magnesium |
| Copper |
|
1800 |
752 |
872 |
1022 |
1382 |
2120 |
|
|
|
No
attack |
No
attack |
No
attack |
No
attack |
Slightly
attacked |
Badly
attacked |
|
