Hybrid Sealing Sheets — Graphite, Metal, and Rubber Combinations
Composite Gasket Sheet
Composite gasket sheets combine two or more material layers (typically graphite, metal foil, and rubber compounds) to deliver sealing performance that no single material achieves alone. We stock several composite constructions for high-temperature exhaust manifolds, flange joints in process piping, and demanding industrial applications where temperature cycling, bolt-load retention, and blowout resistance matter.
At a Glance
Temperature Range
Cork-rubber to +150 °C; rubber-bonded fibre to +180 °C; aramid-reinforced manifold sheet to +260 °C continuous (+350 °C intermittent). For higher temperature service specify graphite-sheet, wire-reinforced-cnaf, or expanded-ptfe.
Thickness Range
0.5 mm to 6.0 mm
Pressure Range
Up to 100 bar typical (rubber-bonded constructions)
Available Forms
Colours
Technical Properties
Typical values across stocked grades. Specific grade data sheets available on request.
Physical Characteristics
Density
0.5–2.0 g/cm³ (construction dependent)
Compressibility
8–25% (ASTM F36, construction dependent)
Recovery
40–60% (ASTM F36)
Chemical Resistance
Resistant To
- Saturated steam to ~150 °C (rubber-bonded fibre); higher steam temperatures require graphite-based composites — see graphite-sheet
- Hydrocarbons and petroleum oils (NBR-bonded grades; cork-rubber)
- Coolants and antifreeze (manifold rubber grades)
- Dilute acids and alkalis at ambient (rubber-bonded grades)
- Air, nitrogen, and inert gases
Limited Resistance
- Aromatic solvents at elevated temperature (NBR binder swells)
- Concentrated oxidising acids (rubber binders attacked)
Not Recommended
- Strong caustic solutions above 80 °C (rubber binder hydrolyses)
- Fuming nitric acid, chromic acid, aqua regia, fluorine gas
- High-pressure structural sealing — specify wire-reinforced-cnaf or graphite with metal insert
- High-temperature service above the rubber binder ceiling — specify graphite-sheet or spiral-wound gaskets
Standards & Certifications
Standards Compliance
Common Applications
- High-temperature flange gaskets in process piping
- Exhaust manifold and turbocharger gaskets
- Steam system joints and valve bonnets
- Heat exchanger channel gaskets
- Petrochemical and refinery flange sealing
- Power generation turbine casing joints
- Boiler handhole and manhole gaskets
- Industrial furnace and kiln door seals
Not Recommended For
- Rubber binders cap the service temperature: NBR ~120 °C, EPDM ~150 °C, FKM ~205 °C, manifold aramid-reinforced grades ~260 °C continuous
- Manifold sheet grades are not chemical-process gaskets — they are engineered for engine exhaust and coolant systems
- For high-temperature service above the rubber binder ceiling, specify flexible graphite (graphite-sheet), wire-reinforced CNAF (wire-reinforced-cnaf), or spiral-wound gaskets — composite sheets in this category are not a substitute
- Cork-rubber recovery is excellent but creep relaxation is high — re-torque after first heat cycle in elevated-temperature applications
- Maximum temperature varies significantly between grades; confirm operating conditions before selection
Available Grades
Cork-Rubber Composite Sheet
Cork granules dispersed in a rubber binder (typically NBR or CR), delivering high recovery and conformability for low-bolt-load and uneven-surface joints. Standard choice for low-pressure transformer covers, gear case covers, and oil pan gaskets. Continuous service to 150 °C; specific gravity 0.5–1.0; 15–25% compressibility per ASTM F36.
Rubber-Bonded Fibre Composite Sheet
Aramid or mineral-fibre reinforcement in a rubber binder (NBR, EPDM, CR, or FKM). Continuous service to 180 °C depending on binder. Good general-purpose flange jointing for water, steam to ~150 °C, hydrocarbons, and dilute chemicals. Note: this overlaps with our CNAF range — see CNAF Gasket Sheet for the full binder lineup, manufacturer grades (Klingersil, Garlock Blue-Gard), and standards coverage.
Aramid-Reinforced Engine Manifold Sheet
Aramid and glass-fibre reinforced rubber compound for automotive and industrial exhaust manifold applications. Resistant to exhaust gases, oils, and coolant. Continuous service to 260 °C with intermittent excursions to 350 °C. Specified for engine head gaskets, manifold gaskets, and turbocharger flange seals.
Related Resources
Related Materials
Need Composite Gasket Sheet?
We supply composite gasket sheet in sheet, roll, and custom die-cut forms. Contact our team for pricing, data sheets, or technical assistance.
Disclaimer
This resource is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.