FVMQ
FVMQ is a fluorosilicone elastomer in which fluorinated side groups are attached to the siloxane backbone, giving fuel and oil resistance together with the wide temperature range of silicone.
Reference datasheet — FVMQ is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the 60A condition
FVMQ grades and fills
FVMQ is supplied in 10 conditions, soft to hard. 60A is the default FabDigit quotes; the values on this page are for it.
Compare all 10 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Carbon/silver-filled conductive & EMI-shielding fluorosilicone | Pick for EMI gaskets on fuel-wetted or oil-exposed enclosures needing both shielding and sealing. | 4 | 150 | 65 Shore A | |
Shore A 40 | Pick for low-compression-force gaskets, diaphragms and thin membranes needing high extensibility. | 7 | 350 | 40 Shore A | |
Flame-retardant fluorosilicone | Choose where a UL 94 V-0 rating or low flame spread is required in addition to fuel resistance. | 7 | 200 | 65 Shore A | |
Shore A 50 | Use where an A60 seal is too stiff for the groove fill or the flange load is limited. | 8 | 300 | 10 Shore D | |
Low-temperature fluorosilicone | Specify for high-altitude / arctic fuel seals that must stay flexible below -60 °C. | 8 | 260 | 60 Shore A | |
Liquid fluorosilicone rubber | Use for high-volume automated injection molding of small fuel/oil seals and micro-parts. | 8 | 300 | 12 Shore D | |
60ADefault Shore A 60 | Default aerospace/industrial fuel-seal compound: best balance of sealing force, elongation and compression set. | 9 | 250 | 15 Shore D | |
Shore A 70 | The usual hardness for fuel-system O-rings with moderate pressure and extrusion-gap risk. | 9 | 200 | 23 Shore D | |
Shore A 80 | Choose for higher pressures / larger extrusion gaps where seal stiffness matters more than elongation. | 10 | 150 | 30 Shore D | |
High-tear / high-strength fluorosilicone | For thin diaphragms, boots and parts demolded over undercuts where tear propagation is the failure mode. | 11 | 320 | 12 Shore D |
Supply forms, finishes and certifications
Ways FVMQ is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
MED | Platinum-cured medical / food-contact fluorosilicone | Certification |
What is FVMQ?
FVMQ is a fluorosilicone elastomer in which fluorinated side groups are attached to the siloxane backbone, giving fuel and oil resistance together with the wide temperature range of silicone. The default condition provides 8.5 MPa tensile strength, 250 % elongation and 200 °C maximum service temperature, and stock is available in Shore A 40–80 hardnesses plus low-temperature, high-temperature, liquid (F-LSR), conductive, flame-retardant and medical compounds, mainly as O-rings, moulded seals and diaphragms. Elongation and tear strength are lower than standard VMQ and material cost and lead time are considerably higher, so plain VMQ is preferred wherever hydrocarbon contact is not a requirement. FVMQ has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 100% of silicone grades. Its glass-transition temperature is -70°C (-94 °F). FVMQ has a tensile strength of 9 MPa (1.23 ksi), stronger than 100% of silicone grades. Elongation at break is 250% and the elastic modulus is 0.01 GPa (7.25×10⁻⁴ Msi).
What is FVMQ used for?
- aircraft fuel seals
- fuel-resistant gaskets
- aerospace O-rings
Limitations
- Limited ductility — 250%, worse than 100% of silicone grades
- Heavy — 1.45 g/cm³ (0.0524 lb/in³), worse than 100% of silicone grades
- High embodied carbon — 11 kg CO₂/kg, worse than 100% of silicone grades
- Absorbs moisture — dry before molding — 0.4%, worse than 100% of silicone grades
- High mold shrinkage — 3%, worse than 100% of silicone grades
FVMQ properties
Typical room-temperature values for FVMQ-60A; bars are the position among silicone grades.
Physical3
FVMQ has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 100% of silicone grades. Its glass-transition temperature is -70°C (-94 °F).
Mechanical8
FVMQ has a tensile strength of 9 MPa (1.23 ksi), stronger than 100% of silicone grades. Elongation at break is 250% and the elastic modulus is 0.01 GPa (7.25×10⁻⁴ Msi).
Thermal8
FVMQ is rated for continuous service to 200°C (392 °F). It conducts heat at 0.21 W/m·K (0.121 BTU/hr·ft·°F), better than 50% of silicone grades. Thermal expansion is 230 µm/m·K (127.8 µin/in·°F).
Electrical6
FVMQ is an electrical insulator with a dielectric strength of 20 kV/mm (508 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 75% of silicone grades. UV resistance is excellent.
Sustainability3
Producing a kilogram of FVMQ takes about 190 MJ of energy and emits 11 kg of CO₂ — more than 100% of silicone grades. Typical recycled content is 0%.
Manufacturability4
FVMQ's machinability is poor (25/100, better than 50% of silicone grades); formability excellent (85/100).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Working with FVMQ
Is FVMQ easy to machine?
Not machined in the usual sense — die-cut, waterjet or cryogenically deflashed; cured stock grinds/tears easily, so use sharp dies and freeze-flash removal.
Can FVMQ be welded?
Not weldable; join by re-molding, Pt-cured self-bonding adhesives or silicone RTV, with plasma/primer treatment for bonding to metals.
Can FVMQ be formed, bent or molded?
Compression/transfer mold peroxide compounds at 160–180 °C, or injection-mold liquid Pt-cured F-LSR at 150–200 °C; a 200 °C/4 h post-cure is essential to strip volatiles and hit compression-set targets, and 2.5–4 % shrinkage must be allowed.
FVMQ 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 |
|---|---|---|
| methylvinylsiloxane comonomercure-site units | 0.05 – 0.6 | 0.2 |
| fumed silica (reinforcing filler)with silane/silazane surface treatment | 20 – 35 | 28 |
| iron oxide / rare-earth heat stabilizer | 0.5 – 3 | 1.5 |
| peroxide or Pt cure system2,5-dimethyl-2,5-di(t-butylperoxy)hexane, or Pt/vinyl-hydride for LSR | 0.3 – 1.5 | 0.8 |
| poly(methyl-3,3,3-trifluoropropyl)siloxafluorinated siloxane base polymer, ~1 CF3 per repeat unit | ≥ 55 (balance) |
What surface finishes work on FVMQ?
Surfaces can be plasma- or primer-treated for bonding/printing; fabric or PTFE-film lamination is used for low-friction diaphragms; no plating or painting.
How much does FVMQ cost?
FVMQ is a high-cost silicone ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
FVMQ — frequently asked
What is FVMQ used for?
FVMQ is typically used for aircraft fuel seals, fuel-resistant gaskets and aerospace O-rings. In short: fuel-resistant silicone; wider temperature range than FKM; higher cost than VMQ.
What is the tensile strength of FVMQ?
FVMQ has a typical tensile strength of 9 MPa (1.23 ksi) — stronger than 100% of silicone grades. Strength varies by condition: see the 10 listed tempers.
Is FVMQ easy to machine?
Not especially — machinability is rated poor (25/100, better than 50% of silicone grades). Not machined in the usual sense — die-cut, waterjet or cryogenically deflashed; cured stock grinds/tears easily, so use sharp dies and freeze-flash removal.
Can FVMQ be welded?
Not weldable; join by re-molding, Pt-cured self-bonding adhesives or silicone RTV, with plasma/primer treatment for bonding to metals.
What surface finishes work on FVMQ?
Surfaces can be plasma- or primer-treated for bonding/printing; fabric or PTFE-film lamination is used for low-friction diaphragms; no plating or painting.
Can FVMQ be formed, bent or molded?
Compression/transfer mold peroxide compounds at 160–180 °C, or injection-mold liquid Pt-cured F-LSR at 150–200 °C; a 200 °C/4 h post-cure is essential to strip volatiles and hit compression-set targets, and 2.5–4 % shrinkage must be allowed.
What is the maximum service temperature of FVMQ?
FVMQ is rated for continuous use to about 200°C (392 °F), and briefly to 230°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does FVMQ cost?
FVMQ is a high-cost silicone ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM D2000 (FK class fluorosilicone line callouts) — ASTM International (2021)
- AMS 3325 / AMS 3327 Fluorosilicone Rubber, fuel resistant — SAE International (2019)
- MIL-DTL-25988 Rubber, Fluorosilicone Elastomer, Oil- and Fuel-Resistant — US DoD (2015)
- Fluorosilicone rubber (FSR) compound datasheets — Shin-Etsu / Momentive / Dow (2023)
- Engineered Materials Handbook Vol. 2: Engineering Plastics & Elastomers — ASM International (1988)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.