Alumina & Ceramics

All of our performance ceramics are available in tubes, rods, discs, and other custom fabrications while providing the highest quality, best service, and lowest price. Please contact us directly or send prints for a custom quote. Additionally, some stocked items are available in our store for immediate shipment. If you need help with your application our Engineering Team is available for scheduled consultations.

  • Oxide Ceramics
  • Alumina 85-99.9% purity
  • Mullite
  • Zirconia, MgO, Yttria SZ, ZTA, and others.
  • Cordierite
  • Porcelain
  • Sapphire
  • Fused Quartz
  • Ceramic Composite
Alumina and performance Ceramics from CeraMaterials
  • Non-oxide Ceramics & Carbides
  • Silicon Carbide, SiC, all types
  • Silicon Nitride (Si3N4)
  • Boron Nitride (BN, all types)
  • Boron Carbide (BC)
  • Tungsten Carbide (WC)
  • Aluminum Nitride (AIN)

Useful Charts

Sintered Ceramics Properties
PropertiesUnitsTestMulliteAlumina
94%		Alumina
96%		Alumina
99.5%		Alumina
99.8%
Densitygm/ccASTM-C202.803.703.723.903.92
Crystal Size AverageMicronsThin-section1012666
Water Absorption%ASTM-37300000
Gas Permeability--00000
Color--TanWhiteWhiteIvoryIvory
Flexural Strength
(MOR) 20℃		MPa (psi x 10³)ASTM-F417170 (25)352 (51)358 (52)379 (55)375 (54)
Elastic Modulus 20℃GPa (psi x 10³)ASTM-C848150 (22)303 (44)303 (44)370 (54)370 (54)
Poisson's Ratio ℃-ASTM-C848-0.210.210.220.22
Compressive Strength 20℃MPa (psi X 10³)ASTM-C773550 (80)2103 (305)2068 (300)2600 (377)2500 (363)
HardnessGPa (kg/mm²)
R45N		Knoop 1000gm
Rockwell 45 N		7.4 (750)
70		11.5 (1175)
78		11.5 (1175)
78		14.1 (1440)
83		14.1 (1440)
83
Tensile Strength 25℃ MPa (psi x 10³)ACMA Test #4-193 (28)221 (32)262 (38)248 (36)
Fracture Toughness
K(l c)		MPa m1/2Notched Beam24-54-54-54-5
Thermal Conductivity 20℃W/m °KASTM-C4083.522.424.730.030.0
Coefficient of Thermal Expansion
25-100℃		1 x 10-6/℃ASTM-C3725.38.28.28.28.2
Specific Heat 100℃J/kg*KASTM-E1269950880880880880
Thermal Shock Resistance
Δ Tc		℃Note 3300250250200200
Max Use Temperature℃No-Load Cond.17001700170017501750
Dielectric Strengthac-kV/mm
acV/mil		ASTM-D1169.8
248		8.3
210		8.3
210		8.7
220		8.7
220
Dielectric Constant 1 MHz25℃ASTM-D1506.09.199.79.8
Dielectric Loss
(tan delta) 1 MHz		25℃ASTM-D1500.00200.00040.00020.00010.001
Volume Resistivity
25℃
500℃
1000℃		ohm-cmASTM-D1829 
> 1014
5 x 1012
3 x 105		 
> 1014
4 x 109
5 x 105		 
> 1014
4 x 109
1 x 106		 
> 1014
2 x 1010
2 x 106		 
> 1014
2 x 1010
2 x 107
Impingement-Note 4-0.520.500.470.47
Rubbing-Note 4--0.60--
1. Data Measurements – All data measurements are typical and made at room temperature unless otherwise noted.
2. Composition Control – all ceramic compositions are controlled using modern chemical, spectrographic, and X-ray fluorescent methods.
3. Thermal Shock Resistance – Tests are run by quenching samples into water from various elevated temperatures. The change in temperature where a sharp decrease in flexural strength is observed is listed as DTc.
4. Wear Resistance – Impingement tests are run using a dry fused alumina abrasive. Rubbing tests are run using a dry 240 grit fused alumina abrasive. The indices in the chart are calculated by dividing the material volume loss by the volume loss of an AD-85 alumina control. The lower in the index, the better the wear resistance.
5. Dielectric Strength numbers represent measurements on samples that were 0.25” thick.
Sintered Alumina Info & Pricing
Sintered Alumina ProductsSizePrice
Alumina Rods
Grade: 99.7% 		0.5" OD x 4"$7.00
0.5" OD x 6"$9.00
Alumina Insulators
Grade: 99.8% 		1.505" OD x 1.254" ID x 0.635" L$5.00
Alumina Rings
Grade: 99.8% 		0.695" OD x 0.540" ID x 0.565" L$3.00
Alumina Tiles
Grade: 99.7% 		0.25" x 4" x 4"$22.00
0.25" x 6" x 6"$35.00
0.25" x 8" x 8"$50.00
0.25" x 12" x 12"$150.00
Alumina Tiles
Grade: 95% 		0.25" x 4" x 4"$18.00
0.25" x 6" x 6"$30.00
0.25" x 8" x 8"$45.00
0.25" x 12" x 12"$140.00
Need a custom size? Contact us for a quote.
Zirconia Ceramic Properties
PropertiesUnitsTestZirconia Toughened Alumina (ZTA)Magnesia Partially Stabilized Zirconia (MgO)Yttria Partially Stabilized Zirconia (YTZP Sintered)Yttria Partially Stabilized Zirconia (YTZP HIPpED)
Color--WhiteIvoryIvoryGray
Densitygm/cm³ASTM-C204.015.726.026.07
Crystal Size AverageMicronsASTM-E11222511
Water Absorption%ASTM-3730000
Gas Permeability--0000
Flexural Strength
(MOR)		MPa (psi x 10³)
@68℉ | @20℃		ASTM-F417450 (65)900 (131)1240 (180)1720 (249)
Elastic ModulusGPa (psi x 106)
@68℉ | @20℃		ASTM-C848360 (52)200 (29)210 (30)210 (30)
Poisson's Ratio@68℉ | @20℃ASTM-C8480.300.300.300.30
Compressive StrengthMPa (psi X 10³)
@68℉ | @20℃		ASTM-C7732900 (421)1750 (254)2500 (363)2500 (363)
HardnessR45N
GPa (kg/mm²)		Rockwell 45 N
KNOOP 1000gm		85
14.5 (1475)		77
11.8 (1200)		81
12.7 (1300)		81
12.7 (1300)
Tensile Strength MPa (psi x 10³)
@77℉ | @25℃		ACMA Test #4290 (42)483 (70)--
Fracture Toughness
MPa m1/2
Klc		NOTCHED BEAM5-6111313
Thermal ConductivityW/m °K
@68℉ | @20℃		ASTM-C40827.02.22.22.2
Coefficient of Thermal Expansion1 x 10-6/℃
@25℉ - 1000℃		ASTM-C3728.310.210.310.3
Specific Heat J/kg*K
@212℉ | 100℃		ASTM-E1269885400400400
Thermal Shock ResistanceΔ Tc
℃		WATER QUENCH300350350350
Dielectric Strength
@ 6.35mm		ac-kV/mm
ac V/mil		ASTM-D1169.0
228		9.4
240		9.0
228		9.0
228
Dielectric Constant1 MHz
@77℉ | 25℃		ASTM-D15010.628.0029.029.0
Dielectric Loss
(Tan Delta)		1 MHz
@77℉ | 25℃		ASTM-D1500.00050.0010.0010.001
Volume Resistivity
@77℉ | 25℃
@932℉ | 500℃
@1832℉ | 1000℃		ohm-cmASTM-D1829 
>1014
2 x 109
3 x 106		 
>1013
2 x 104
<103		 
>1013
2 x 104
<103		 
>1013
2 x 104
<103
Carbide Ceramic Properties
PropertiesUnitsTestReaction Bonded
Silicon Carbide		Direct Sintered
Silicon Carbide		CVD Sintered
Silicon Carbide		Reaction Bonded
Boron Carbide		Hot Pressed
Boron Carbide		Tungsten
Carbide
Color--BlackBlackBlack-BlackGray
Densitygm/cm³ASTM-C203.103.153.212.652.514.90
Crystal Size AverageMicronsASTM-E112124--151
Water Absorption%ASTM-373000000
Gas Permeability--000000
Flexural Strength
(MOR)		MPa (psi x 10³)
@68℉ | @20℃		ASTM-F417462
(67)		480
(70)		470-520
(68-75)		250
(36)		410
(59)		2330
(338)
Elastic ModulusGPa (psi x 106)
@68℉ | @20℃		ASTM-C848393
(57)		410
(59)		435-460
(63-67)		379
(55)		460
(67)		614
(89)
Poisson's Ratio@68℉ | @20℃ASTM-C8480.200.210.210.180.17-
Compressive StrengthMPa (psi X 10³)
@68℉ | @20℃		ASTM-C7732700 (392)3500 (508)-1721 (250)-4343 (630)
HardnessR45N
GPa (kg/mm²)		Rockwell 45 N
KNOOP 1000gm		-
24.5 (2500)		-
27.4 (2800)		-
27 (2750)		-
25.5 (2600)		27
(2750)		15.2
(1548)
Tensile Strength MPa (psi x 10³)
@77℉ | @25℃		ACMA Test #4307 (44.5)-----
Fracture Toughness
MPa m1/2
Klc		NOTCHED BEAM443.53-42.524
Thermal ConductivityW/m °K
@68℉ | @20℃		ASTM-C408125.0150.0140.050.090.084.0
Coefficient of Thermal Expansion1 x 10-6/℃
@25℉ - 1000℃		ASTM-C3724.34.44.64.55.65.9
Specific Heat J/kg*K
@212℉ | 100℃		ASTM-E1269800800665---
Thermal Shock ResistanceΔ Tc
℃		WATER QUENCH400300----
Dielectric Strength
@ 6.35mm		ac-kV/mm
ac V/mil		ASTM-D116------
Dielectric Constant1 MHz
@77℉ | 25℃		ASTM-D150------
Dielectric Loss
(Tan Delta)		1 MHz
@77℉ | 25℃		ASTM-D150------
Volume Resistivity
@77℉ | 25℃
@932℉ | 500℃
@1832℉ | 1000℃		ohm-cmASTM-D1829 
< 10³
< 10³
< 10³		 
< 105
< 10³
< 10²		 
< 0.10 - > 105
-
-		 
< 10³
< 10³
< 10³		 
< 10²
-
-		 
< 10³
< 10³
< 10³
Nitride Ceramic Properties
PropertiesUnitsTestHot Pressed
Aluminum Nitride		Silicon Nitride
(Glass HIPped)		High Temp Silicon Nitride
(Glass HIPped)
Color--GrayGrayGray
Densitygm/cm³ASTM-C203.263.213.22
Crystal Size AverageMicronsASTM-E1123--
Water Absorption%ASTM-373000
Gas Permeability--000
Flexural Strength
(MOR)		MPa (psi x 10³)
@68℉ | @20℃		ASTM-F417340 (49)1000 (145)900 (131)
Elastic ModulusGPa (psi x 106)
@68℉ | @20℃		ASTM-C848330 (48)310 (45)310 (45)
Poisson's Ratio@68℉ | @20℃ASTM-C8480.250.270.27
Compressive StrengthMPa (psi X 10³)
@68℉ | @20℃		ASTM-C773-2500 (363)-
HardnessR45N
GPa (kg/mm²)		Rockwell 45 N
KNOOP 1000gm		-
11 (1120)		-
16 (1630)		-
16 (1630)
Tensile Strength MPa (psi x 10³)
@77℉ | @25℃		ACMA Test #4--630 (91)
Fracture Toughness
MPa m1/2
Klc		NOTCHED BEAM36.56.0
Thermal ConductivityW/m °K
@68℉ | @20℃		ASTM-C40880.03438
Coefficient of Thermal Expansion1 x 10-6/℃
@25℉ - 1000℃		ASTM-C3725.03.73.1
Specific Heat J/kg*K
@212℉ | 100℃		ASTM-E1269740-724
Thermal Shock ResistanceΔ Tc
℃		WATER QUENCH---
Dielectric Strength
@ 6.35mm		ac-kV/mm
ac V/mil		ASTM-D1168.2 (207)--
Dielectric Constant1 MHz
@77℉ | 25℃		ASTM-D15098-
Dielectric Loss
(Tan Delta)		1 MHz
@77℉ | 25℃		ASTM-D150< 0.001--
Volume Resistivity
@77℉ | 25℃
@932℉ | 500℃
@1832℉ | 1000℃		ohm-cmASTM-D1829 
> 1013
> 105
> 103		 
> 1014
-
-		 
-
-
-
Silicate Ceramic Properties
PropertiesUnitsTestPorcelainSteatiteCordieriteMullite
Color--WhiteBeigeOrange-TanTan
Densitygm/cm³ASTM-C202.402.782.002.80
Crystal Size AverageMicronsASTM-E112---10
Water Absorption%ASTM-37300100
Gas Permeability--00Porous0
Flexural Strength
(MOR)		MPa (psi x 10³)
@68℉ | @20℃		ASTM-F417130 (19)140 (20)66 (9.5)170 (25)
Elastic ModulusGPa (psi x 106)
@68℉ | @20℃		ASTM-C848104 (15)110 (16)103 (15)150 (22)
Poisson's Ratio@68℉ | @20℃ASTM-C848--0.31-
Compressive StrengthMPa (psi X 10³)
@68℉ | @20℃		ASTM-C773590 (86)-165 (24)550 (80)
HardnessR45N
GPa (kg/mm²)		Rockwell 45 N
KNOOP 1000gm		60
5.9 (600)		57
-		50
5.8 (590)		70
7.4 (750)
Tensile Strength MPa (psi x 10³)
@77℉ | @25℃		ACMA Test #4--19 (2.7)-
Fracture Toughness
MPa m1/2
Klc		NOTCHED BEAM2--2
Thermal ConductivityW/m °K
@68℉ | @20℃		ASTM-C4085.02.52.53.5
Coefficient of Thermal Expansion1 x 10-6/℃
@25℉ - 1000℃		ASTM-C3724.993.45.3
Specific Heat J/kg*K
@212℉ | 100℃		ASTM-E1269---950
Thermal Shock ResistanceΔ Tc
℃		WATER QUENCH-100350300
Dielectric Strength
@ 6.35mm		ac-kV/mm
ac V/mil		ASTM-D116--10 (255)9.8 (248)
Dielectric Constant1 MHz
@77℉ | 25℃		ASTM-D1505.9-5.06.0
Dielectric Loss
(Tan Delta)		1 MHz
@77℉ | 25℃		ASTM-D1500.0024-7.00.002
Volume Resistivity
@77℉ | 25℃
@932℉ | 500℃
@1832℉ | 1000℃		ohm-cmASTM-D1829 
-
-
-		 
1013
108
-		 
1012
106
-		 
1014
4 x 105
-

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Downloadables

Sintered Ceramics
Boron Nitride