Wear Selection Criteria

Property	Units	Aluminum Oxide P87	Aluminum Oxide P90	Fine Grained Aluminum Oxide Endura
Bulk Density ASTM-C20-87	Kg/M³ lbs./ft³ g/cc	3500 218.3 3.5	3600 224.5 3.6	3600 224.5 3.6
Apparent Porosity ASTM-C20-87	%	0	0	0
Flexural Strength ASTM-C674-88	MPa kpsi	275.8 40	334.4 48.5	334.4 48.5
Elastic Modulus ASTM-C674-88	GPa Mpsi	174.6 25	190.0 27.2	190.0 27.2
Compressive Strength ASTM-C773-88	MPa Kpsi	1723.8 250	1461.7 212	1751.3 254
Tensile Strength ACMA#4	Kpsi MPa	18 125.73	18.5 129.223	18.5 129.2
Vicker's Hardness ASTM-E384-89	VHN	1190	1136	1190
Knoop Hardness ASTM-E384-89	KHN	1063	1014	1063
Rockwell C Scale	Rc	71	71	71
MOH Scale	—	8.0-9.0	8.0-9.0	8.0-9.0
Fracture Toughness Vicker's Indentation	MPa/M²	3.9	3.9	4.2
Crystal Size	MICRON	3.0-5.0	3.0-5.0	2.5-3.5
Linear C.T.E.	PPM/C rt-200 rt-400 rt-600 rt-800 rt-1000	5.04 5.87 7.08 7.64 8.6	5.65 6.2 6.57 7.46 7.7	5 6.42 7.06 7.57 8.7

Property	Units	Zirconia toughened Zirmonite 200	Zirmonite 1000 Tetragonal Zirconia Zirconium Oxide	Si3N4-Si Nitride Bonded Silicon Carbide
Bulk Density ASTM-C20-87	Kg/M³ lbs./ft³ g/cc	4480 279.4 4.48	6000 374.2 6.00	2925 182.4 2.93
Apparent Porosity ASTM-C20-87	%	0	0	0
Flexural Strength ASTM-C674-88	MPa kpsi	758.5 110	806.7 117	93.1 13.5
Elastic Modulus ASTM-C674-88	GPa Mpsi	281.5 40.3	174.6 25	33.2 4.8
Compressive Strength ASTM-C773-88	MPa Kpsi	2930.4 425	2440.8 354	558.5 81
Tensile Strength ACMA#4	Kpsi MPa	70 489	85 593.7	23.8 166.2
Vicker's Hardness ASTM-E384-89	VHN	1650	1150	773
Knoop Hardness ASTM-E384-89	KHN	1473	1027	799
Rockwell C Scale	Rc	75	69	63
MOH Scale	—	9.0	7.0-8.0	6.5-7.5
Fracture Toughness Vicker's Indentation	MPa/M²	6.5	8.6	N/A
Crystal Size	MICRON	2.0-4.0	1.0-2.0	bimodal 500 and 20
Linear C.T.E.	PPM/C rt-200 rt-400 rt-600 rt-800 rt-1000	7.80 8.3 8.6 9.10 9.10	10.26 10.72 11.04 11.11 11.1	2.42 2.97 3.41 3.75 4.09