Conquer the Fuel Line – Unmatched Resistance to Oils, Fuels, and Polar Solvents
Fluorosilicone elastomers have long been the material of choice for fuel-handling systems, and the IOTA FLSR3400 series takes this legacy to the next level. Engineered with a fully fluorinated polymer backbone and a platinum-cure system, this liquid rubber provides exceptional resistance to hydrocarbon fuels, aromatic solvents, and engine oils—conditions that quickly degrade conventional silicones or organic rubbers.
Independent testing per ASTM D471 confirms the superior swelling behavior of the FLSR3400 series. In IRM903 reference oil at 150 °C for 168 hours, volume increase is merely 3 %, ensuring that O-rings and gaskets maintain their interference fit and sealing pressure. In Fuel C (containing toluene and isooctane) at 60 °C for 168 hours, swell is limited to 23 %, while in FAM B test fluid—a more aggressive reference for automotive fuel systems—swell stays at 29 %. These results are consistent across all three hardness grades, meaning you can select the desired durometer without compromising chemical compatibility. Additionally, the post-cured samples show improved compression set values (as low as 5 % for FLSR3430 and FLSR3440), which is critical for static seals under sustained bolt load.
Beyond liquid resistance, the material retains its elastomeric properties from low to high temperatures. Tensile strength after post-cure remains above 7 MPa, and elongation at break ranges from 180 % to 340 %, providing sufficient deformation capacity for assembly and thermal expansion. Tear strength of 12–13 kN/m ensures resistance to installation damage and dynamic stress. Whether you are designing fuel injector seals, quick-connect couplings, or tank-level sensors, the IOTA FLSR3400 series offers the chemical robustness and mechanical toughness required for long-term reliability. Specify IOTA – the fluorosilicone that stands up to the toughest fluids.