Ox/Ox OXIPOL
Matrix
also Nextel/Al2O3, WHIPOX
OXIPOL = polymer-derived (siloxane) matrix oxide CMC, Nextel 610/720 reinforced
Low-temperature-cured, low-shrinkage route for large thin-wall burner liners and heat-treatment fixtures; cheaper to make but slightly lower strength and matrix stability than slurry Ox/Ox.
Values for the OXIPOL condition
Other Ox/Ox grades and fills
Ox/Ox is listed in 6 conditions; see the grade overview at Ox/Ox.
Compare all 6 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Wound highly porous oxide CMC | Filament-wound tubes/liners with very high matrix porosity — lightweight, extremely thermal-shock tolerant and quasi-ductile, but low strength and strongly anisotropic. | — | 130 | 0.5 | — |
OXIPOLThis page Polymer-derived (siloxane) matrix oxide CMC, Nextel 610/720 reinforced | Low-temperature-cured, low-shrinkage route for large thin-wall burner liners and heat-treatment fixtures; cheaper to make but slightly lower strength and matrix stability than slurry Ox/Ox. | — | 140 | 0.35 | — |
Nextel 720 fiber in porous alumina–silica matrix | Choose for maximum thermal-shock tolerance and low CTE at 1100–1200 °C where absolute strength is secondary. | — | 165 | 0.4 | — |
N720-ADefault Nextel 720 (mullite+alumina) fiber in porous alumina matrix | The mainstream production Ox/Ox: best creep resistance and highest use temperature of the common systems; used for exhaust nozzles, seals and hot-gas liners. | — | 190 | 0.3 | — |
Nextel 610 fiber in porous alumina–silica (mullite-forming) matrix | Lower-shrinkage, lower-cost matrix version of N610; good damage tolerance and dielectric behaviour for radome/duct parts up to ~1000 °C. | — | 250 | 0.3 | — |
Nextel 610 (α-alumina) fiber in porous alumina matrix | Pick when room- and mid-temperature strength/stiffness matter most and service stays below ~1000 °C (610 fiber creeps above that). | — | 290 | 0.25 | — |
What is Ox/Ox OXIPOL?
Ox/Ox OXIPOL is Ox/Ox in the OXIPOL condition — low-temperature-cured, low-shrinkage route for large thin-wall burner liners and heat-treatment fixtures; cheaper to make but slightly lower strength and matrix stability than slurry Ox/Ox. Ox/Ox OXIPOL has a tensile strength of 140 MPa (20.3 ksi), weaker than 58% of composite grades. Elongation at break is 0.35% and the elastic modulus is 60 GPa (8.7 Msi). Ox/Ox OXIPOL has a density of 2.45 g/cm³ (0.0885 lb/in³), heavier than 80% of composite grades. N720-A is the default condition FabDigit quotes; OXIPOL is available on request or by drawing note.
Advantages
- High service temperature — 1,150°C (2,102 °F), better than 93% of composite grades
- Good UV / weathering resistance — 100/100, better than 93% of composite grades
Limitations
- Limited ductility — 0.35%, worse than 92% of composite grades
- High embodied carbon — 45 kg CO₂/kg, worse than 90% of composite grades
- Heavy — 2.45 g/cm³ (0.0885 lb/in³), worse than 80% of composite grades
- Difficult to machine — 18/100, worse than 80% of composite grades
- Hard to polish — 25/100, worse than 76% of composite grades
Ox/Ox OXIPOL properties
Typical room-temperature values for Ox/Ox OXIPOL; 14 are specific to this condition. Other listed values are Ox/Ox reference data and may not represent this condition. Bars are the position among composite grades.
Physical2
Ox/Ox OXIPOL has a density of 2.45 g/cm³ (0.0885 lb/in³), heavier than 80% of composite grades.
Mechanical11
Ox/Ox OXIPOL has a tensile strength of 140 MPa (20.3 ksi), weaker than 58% of composite grades. Elongation at break is 0.35% and the elastic modulus is 60 GPa (8.7 Msi).
Thermal6
Ox/Ox OXIPOL is rated for continuous service to 1,150°C (2,102 °F). It conducts heat at 1.5 W/m·K (0.867 BTU/hr·ft·°F), better than 57% of composite grades. Thermal expansion is 6 µm/m·K (3.33 µin/in·°F).
Electrical3
Ox/Ox OXIPOL has an electrical resistivity of 1×10⁹ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 77% of composite grades. UV resistance is excellent.
Sustainability3
Producing a kilogram of Ox/Ox OXIPOL takes about 600 MJ of energy and emits 45 kg of CO₂ — more than 87% of composite grades. Typical recycled content is 0%.
Manufacturability2
Ox/Ox OXIPOL's machinability is poor (18/100, worse than 80% of composite grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ox/Ox OXIPOL
Is Ox/Ox easy to machine?
Green (pre-sinter) state trims easily with carbide/router; after sintering use diamond grinding, diamond core drilling or abrasive waterjet, and avoid sharp notches and edge delamination.
Can Ox/Ox be welded?
Not weldable — joined by mechanical fastening with ceramic/superalloy bushings, ceramic adhesives or co-sintered oxide joints.
Can Ox/Ox be formed, bent or molded?
Slurry- or sol-infiltrated prepreg is hand/automated laid up, vacuum-bagged and autoclave/oven cured, then pressureless-sintered at ~1000–1200 °C; near-net shaping is essential since re-infiltration densification is limited, and filament winding is used for WHIPOX-type tubes.
What surface finishes work on Ox/Ox?
Surfaces can be left as-woven or given an oxide seal/engobe, FGI insulating topcoat or reflective/emissive coating; no anodizing, plating or painting is applicable.
Ox/Ox chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| SiO2mullite-forming silica in N720 fiber and/or aluminosilicate matrix | 8 – 28 | 20 |
| Fe2O3typical Nextel 610 fiber additive/impurity | 0 – 0.5 | 0.2 |
| B2O3grain-growth inhibitor in some oxide fibers | 0 – 0.5 | 0.1 |
| fiber volume fractionvol %, 0/90 woven laminate | 35 – 50 | 42 |
| open porosityvol %, engineered matrix porosity for crack deflection | 18 – 35 | 25 |
| Al2O3α-alumina/mullite from fiber + alumina matrix | ≥ 65 (balance) | — |
Ox/Ox OXIPOL — frequently asked
What is Ox/Ox OXIPOL used for?
Ox/Ox OXIPOL is typically used for exhaust nozzle flaps, combustor liners, industrial furnace components, gas turbine exhaust mixers and high-temperature insulation panels. In short: oxidation-stable without coating; low thermal conductivity CMC; static hot-gas structures.
What is the tensile strength of Ox/Ox OXIPOL?
Ox/Ox OXIPOL has a typical tensile strength of 140 MPa (20.3 ksi) — weaker than 58% of composite grades. Strength varies by condition: see the 6 listed tempers.
Is Ox/Ox OXIPOL easy to machine?
Not especially — machinability is rated poor (18/100, worse than 80% of composite grades). Green (pre-sinter) state trims easily with carbide/router; after sintering use diamond grinding, diamond core drilling or abrasive waterjet, and avoid sharp notches and edge delamination.
Can Ox/Ox OXIPOL be welded?
Not weldable — joined by mechanical fastening with ceramic/superalloy bushings, ceramic adhesives or co-sintered oxide joints.
What surface finishes work on Ox/Ox OXIPOL?
Surfaces can be left as-woven or given an oxide seal/engobe, FGI insulating topcoat or reflective/emissive coating; no anodizing, plating or painting is applicable.
Can Ox/Ox OXIPOL be formed, bent or molded?
Slurry- or sol-infiltrated prepreg is hand/automated laid up, vacuum-bagged and autoclave/oven cured, then pressureless-sintered at ~1000–1200 °C; near-net shaping is essential since re-infiltration densification is limited, and filament winding is used for WHIPOX-type tubes.
What is the maximum service temperature of Ox/Ox OXIPOL?
Ox/Ox OXIPOL is rated for continuous use to about 1,150°C (2,102 °F), and briefly to 1,300°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- COI Ceramics Oxide/Oxide CMC (N610 and N720 systems) property sheets — COI Ceramics / ATK (2015)
- Nextel Ceramic Fibers and Textiles Technical Reference — 3M (2018)
- OXIPOL oxide CMC components (Keramikblech) — Pritzkow Spezialkeramik (2020)
- Developments in Oxide Fiber Composites (J. Am. Ceram. Soc. 89) — American Ceramic Society / F.W. Zok (2006)
- WHIPOX all-oxide CMC — processing and properties reports — DLR Institute of Materials Research (2012)
- ASM Handbook Vol. 21: Composites — Ceramic Matrix Composites — ASM International (2001)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.