O'-SialOn thermOcOuple prOtectiOn tubeS (tcpt) - Pyrotek

O’-SialOn thermOcOuple 

prOtectiOn tubeS (tcpt) 

O’-SialOn / SilicOn carbide thermOcOupleS 

O’-Sialon thermocouple protection tubes are available in a range of standard 

lengths and diameters. they are ideally suited for use in the aluminium 

industry; they are non-wetted by aluminium, have a high level of oxidation 

resistance, have a high resistance to chemical corrosion, high abrasion 

resistance and excellent thermal response properties. 

SUPPLY OPTIONS 

the unit can be supplied as ceramic tube only, or they can be supplied 

complete with steel head and thermocouple fitted. 

APPLICATIONS 

• holding furnace dip well, launders and 

table tops 

• bail out crucibles 

• casting furnaces—gravity 

• crucible holding furnaces 

• low pressure die casting furnaces 

• degassing crucibles 

ADVANTAGES 

• all small and medium tcpt’s are dip 

tested in aluminium to ensure good 

thermal shock properties 

• non-wetting to aluminium 

• less dross build up at metal line 

• high resistance to oxidation 

• high chemical corrosion resistance 

• high abrasion resistance 

• excellent response time 

• narrow temperature control band for 

energy conservation 

TECHNICAL DATA 

composition Sic 65% 

O’-Sialon 35% 

bulk density 2.6 g/cm3 167.19 lbs/ft3 apparent 18.10% 

porosity 

modulus of 34 mpa 

rupture 

coefficient of 4.4 x 10 

expansion 

-6 /°c 

2.44 x 10-6 /°F 

thermal 8.9 W/m·K @ 720°c 

conductivity 

modulus of 

elasticity (c 203) † 

78 mpa 

®

O’-SIALON THErmOCOUPLE PrOTECTION TUbES (TCPT) 

rESPONSE TImE 

the response time for four different thermocouple protection tubes is graphed below. the tcpts were placed in a ladle of 

liquid aluminium and a solid aluminium ingot was added to the ladle causing the liquid metal temperature to fall. the graph 

shows how each tcpt responded. 

USE & CLEANING 

• before use, ensure the tcpt is dry. 

• if possible, preheat to approximately 400°c (750°F). 

• continuous max use is 1500°c (2730°F). 

• O’-Sialon tcpt’s can be damaged by mechanical mishandling. to prevent damage, it is recommended that the tcpt is 

removed from the furnace or crucible prior to skimming, stirring or using other tools in the metal bath that may come in 

contact with the tcpt. care needs to be taken to avoid bumping or hitting the tcpt. 

• if possible, remove the tcpt when filling the crucible or furnace. 

• clean the tcpt while still hot (straight from molten metal) using a wooden or calcium silicate tool. 

PYrOTEk INC. PAGE 2


AVAILAbLE SIzES 

Small diameter 

17 mm Od 9 mm id 

SerieS 

auckland 

part no 

length 

(mm) 

OSitpt001 300 

OSitpt002 400 

OSitpt003 460 

OSitpt004 500 

OSitpt005 600 

OSitpt006 700 

OSitpt007 800 

OSitpt008 850 

OSitpt009 900 

medium diameter 


SerieS 

auckland 

part no 

length 

(mm) 

OSitpt022 400 

OSitpt023 460 

OSitpt024 500 

OSitpt025 600 

OSitpt026 700 

OSitpt026-1 750 

OSitpt027 800 

OSitpt028 850 

OSitpt029 900 

OSitpt030 1000 

OSitpt031-1 1070 



larGe diameter 


SerieS 

auckland 

part no 

length 

(mm) 

OSitpt041 300 

OSitpt042 450 

OSitpt043 600 

OSitpt044 750 

OSitpt045 900 



Small Diameter Protection Tube 

medium Diameter Protection Tube 

Large Diameter Protection Tube 

PYrOTEk INC. PAGE 3


PINNACLE THErmOCOUPLE PrOTECTION TUbES 

O’-Sialon (bonded silicon carbide) tcpt 

pyrotek’s pinnacle thermocouple protection tubes are made from O’-Sialon, 

a long-life, non-wetting, temperature-sensitive (bonded silicon carbide) 

thermocouple protection tube for foundry and other temperature-sensitive 

applications. 

the robust properties of the pinnacle thermocouple protection tubes make 

it an excellent alternative to competitive tubes in temperature measurement, 

maintenance and product life areas. 

THrEADED 

part id l(mm) 

pptp01 152.4 (6") 

pptp02 254 (10") 

pptp03 304.8 (12") 

pptp04 457.2 (18") 

pptp05 609.6 (24") 

pptp06 762 (30") 

pptp07 914.4 (36") 

pptp08 1066.8 (42") 

pptp09 1219.2 (48") 

pptp10 1371.6 (54") 

pptp11 1524 (60") 

pptp12 1828.8 (72") 

part id l(mm) 

pptp21 535 (22") 

pptp22 152.4 (6") 

pptp23 254 (10") 

pptp24 304.8 (12") 

pptp25 457.2 (18") 

pptp26 609.6 (24") 

pptp27 762 (30") 

pptp28 914.4 (36") 

pptp29 1066.8 (42") 

pptp30 1219.2 (48") 

pptp31 1371.6 (54") 

pptp32 1524 (60") 

note: the physical and chemical properties listed represent typical, average values obtained in accordance 

with accepted test methods and are subject to normal manufacturing variations. they are supplied as a 

technical service and are subject to change without notice. 

contact Information: www.pyrotek.info/locations 

AVAILAbLE SIzES 

2” Od x 1/2” or 3/4” pipe in lengths as listed. 

lengths available 

6, 10, 12, 18, 24, 30, 36, 42, 48, 54, 60, and 

72 inch. 

cap colors 

Green 3/4” npt 

red 1/2” npt 

Yellow 3/4” bSp 

White 1/2” bSp 

part id l(mm) 

pptp40 535 (22") 

pptp41 152.4 (6") 

pptp42 254 (10") 

pptp43 304.8 (12") 

pptp44 457.2 (18") 

pptp45 609.6 (24") 

pptp46 762 (30") 

pptp47 914.4 (36") 

pptp48 1066.8 (42") 

pptp49 1219.2 (48") 

pptp50 1371.6 (54") 

pptp51 1524 (60") 

pptp52 1828.8 (72") 

part id l(mm) 

pptp61 152.4 (6") 

pptp62 254 (10") 

pptp63 304.8 (12") 

pptp64 457.2 (18") 

pptp65 609.6 (24") 

pptp66 762 (30") 

pptp67 914.4 (36") 

pptp68 1066.8 (42") 

pptp69 1219.2 (48") 

pptp70 1371.6 (54") 

pptp71 1524 (60") 

pptp72 1828.8 (72") 

pptp73 535 (22") 

Product type: 177 

commodity code: 06002 

Pyrotek Inc. • corPorate offIce • 9503 e. MontgoMery avenue • SPokane valley, Wa 99206, uSa • P: 509-926-6212 • f: 509-927-2408 

www.pyrotek.info • email: info@pyrotek.info feB-08-e4-854

O'-SialOn thermOcOuple prOtectiOn tubeS (tcpt) - Pyrotek

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