99% Al₂O₃ Ceramic Sleeve

The 99% Al₂O₃ ceramic sleeve is a premium-grade technical ceramic component engineered for the most demanding industrial conditions. Manufactured using ultra-fine, high-purity aluminum oxide, this sleeve delivers exceptional hardness (Mohs 9+), low porosity, and high mechanical strength.

Compared to standard 95% alumina, the 99% version provides superior resistance to acids, alkalis, high-velocity particulates, and extreme temperatures—making it the ideal choice for critical components in power plants, mining operations, chemical processing, and high-temperature kiln systems.

These ceramic sleeves are commonly used as linings for steel pipes, elbows, tees, and equipment housings. They protect against internal abrasion, reduce maintenance frequency, and increase equipment lifespan. Their dimensional accuracy and surface finish make them well-suited for precision assemblies.

Sunny Steel offers customizable dimensions, lengths, and thicknesses, ensuring optimal fit and performance for your unique system needs. Whether applied in pneumatic conveying, slurry transport, or reactor linings, 99% alumina ceramic sleeves ensure long-lasting protection and operational reliability.

Technical Datasheet of Advanced Alumina Ceramics
Material	Unit	95% Al₂O₃	96% Al₂O₃	99% Al₂O₃	99.5% Al₂O₃	99.8% Al₂O₃
Purity	%	95	96	99	99.5	99.8
Color	---	White/Pink	White	Ivory	Ivory	Ivory
Density	g/cm³	3.65	3.72	3.85	3.90	3.92
Water Absorption	%	0	0	0	0	0
Moh's Hardness	---	9	9	9	9	9
HV Hardness	---	>1300	>1300	1700	1750	1800
Flexural Strength @25°C	MPa	300	300	330	375	390
Fracture Toughness	MPa·m^1/2	3~4	3~4	3~4	4	4
Compressive Strength (25°C)	MPa	2200	2200	2350	2450	2500
Thermal Conductivity @25°C	W/m·K	18–22	≥24	27	29	32
Thermal Expansion Coefficient (25–1000°C)	10^-6/°C	8	8	8	8	8
Thermal Shock Resistance	ΔT (°C)	220	220	180–200	180–200	180–200
Max. Working Temperature	°C	1500	1500	1700	1750	1750
Dielectric Strength	kV/mm	16	17.2	20	22	22
Electrical Resistivity @25°C	Ω·cm	10¹⁴	10¹⁴	10¹⁴	10¹⁴	10¹⁴
Dielectric Constant @1MHz	---	9	9	9.7	9.7	9.8
Dielectric Loss (Tan δ) @1MHz	---	0.0004	0.0002	0.0002	0.0001	0.0001

Compare physical, thermal, and electrical properties across various purity levels of alumina ceramic (Al₂O₃).

Specification of Ceramic Tubes
Parameter	Details
Material Options	Alumina (40%–99.8%), Zirconia, Silicon Carbide, Silicon Nitride
Forming Methods	Extrusion, Dry Pressed, Hot Pressed, CIM, ISO Pressed
Dimensional Capability	Min. ID: 1mm; Max. OD: 800mm
Dimensional Tolerance	OD ±0.005mm, ID ±0.01mm, Length ±0.001mm
Surface Treatment	Polished, Glazed, or Metalized
Secondary Processing	CNC machining, lapping, threading, drilling, grinding, laser cutting