Hexoloy® Seal Blanks

Sintered Silicon Carbide Blanks

Low volume Hexoloy® SA sintered silicon carbide blanks are available in a range of outer and inner diameter combinations.These blanks are typically less than 25.4 mm thick, though thicker blanks are available.

High volume blanks with quantities over 500 pcs are available as dry-pressed product up to 130.18 mm outer diameter. Blanks are typically unground and sold with ‘as-fired’ tolerances.

Features and Benefits

Benefits
  • Exceptional hardness
  • Chemically inert to a wide range of chemicals
Applications
  • Seal face and seat for mechanical seals used in industrial pumps
Material Properties

Hexoloy® SA Properties
 

Physical Properties Units SA
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***
                                 @ 1,000°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

These blanks are typically less than 25.4 mm thick, though thicker blanks are available. High volume blanks with quantities over 500 pcs are available as dry-pressed product up to 130.18 mm outer diameter.