Hexoloy^® Seal Tubes

Sintered Silicon Carbide Seal Tubes

Hexoloy^® SA sintered silicon carbide seal tubes are available in a wide range of OD and ID combinations. Typical length of the seal tube is 12”, trough 6” tube is also available. Seal tubes are unground and sold with “as-fired” tolerances.

Exceptional hardness
Chemically inert to a broad range of chemicals

Seal faces for mechanical seals used in industrial pumps

Physical Properties	Units	SE
Composition (phases)		SiC
Density	g/cm³	3.10
Grain Size	Qm	4-10
Hardness (Knoop)**	kg/mm²	2800
Flexural Strength 4pt. @ RT***	MPa x10³lb/in²	380 55
Flexural Strength 3pt. @ RT***	MPa x10³lb/in²	550 80
Compressive Strength @ RT	MPa x10³ lb/in	3900 560
Modulus of Elasticity @ RT	GPa x10⁶ lb/in	430 62
Weibull Modulus (2 parameters)		10
Poisson Ratio		0.14
Fracture Toughness @ RT Double Torsion & SENB	MPa x m^½ 10³lb/in²x in^½	4.60 4.20
Coefficient of Thermal Expansion RT to 700°C	x10^-6mm/mm°K x10^-6in/in°F	4.02 2.20
Max. Service Temp (air)	°C °F	1900 3450
Mean Specific Heat @ RT	J/gm°K	0.67
Thermal Conductivity @ RT	W/m°K Btu/ft h°F	125.6 72.6
@ 200°C	W/m°K Btu/ft h°F	102.6 59.3
@ 400°C	W/m°K Btu/ft h°F	77.5 44.8
Permeability RT to 1000°C		All impervious to gases over 31 MPa
Electrical Resistivity @ RT*** @ 1000°C	ohm-cm	10²-10⁸ 0.01-0.2
Emissivity		0.9

* Composition code: Si = free silicon metal; C = free graphite; SiC = silicon carbide
* Knoop 100-gm load
*** Test Bar Size: 3 x 4 x 45 mm (0.118" x 0.157" x 1.772")
*** Dependent upon dopants in Hexoloy^® SA SiC which will decrease electrical resistivity

Typical length of the seal tube is 12”, through 6” tube is also available.