Fluorosilicone O-Rings | FVMQ 70 Duro Blue | Aerospace Fuel Seals

Fluorosilicone O-Rings are a silicone and FKM hybrid seal, used for fuel and lubricant resistance across a wide temperature range. This FVMQ 70 durometer compound handles jet fuel, diester-based lubricants, and oxygen plasma up to 392°F, which makes it a solid pick for aerospace, automotive, and semiconductor ashing equipment.

These blue O-Rings meet MIL-DTL-25988/1 and AMS-R-25988 Class 1 Grade 70, so you can match the exact spec you need. Fluorosilicone also holds up well to aging and sunlight and stays flexible in the cold. Reach for it when you want fuel resistance plus high and low temperature performance in one seal. All sizes are stocked and ready to ship.