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”, through 6” tube is also available. Seal tubes are unground and sold with “as-fired” tolerances.

Features and Benefits

Benefits
  • Exceptional hardness
  • Chemically inert to a broad range of chemicals
Application
  • Seal faces for mechanical seals used in industrial pumps
Material Properties
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
x10lb/in2
380
55
Flexural Strength
3pt. @ RT***
MPa
x10lb/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 m½
103lb/in2 x in½
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

Size

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