In the addition-cure liquid fluorosilicone rubber (F-LSR) spectrum, the "vinyl-terminated polyfluorosiloxane backbone (–Si(CH₃)(CH₂CH₃)–O–[Si(CH₃)(CF₃CH₂CH₂)–O]ₙ–)" and "low-H fluorosilicone (Si-H) crosslinker density" jointly dictate room-temperature Pt-catalyzed cure speed, volume swell resistance against Fuel C (iso-octane/toluene blend), and compression set retention from -60℃ to 200℃. Conventional VMQ swells >150% in non-polar oil; FKM brittle at -20℃ and cannot RT-cure; standard LSR cures at RT but lacks fluorosilicone oil resistance. As aerospace fuel seals, auto turbo hoses, and NEV battery pack coolant seals demand "RT 48h full cure, Fuel C swell ≤24%, tensile ≥8MPa, tear ≥14kN/m, 35A hardness, 177℃×22h compression set ≤21%, 1:1 mix-easy," sourcing a pale-yellow A/B, A 350Pa·s/B 300Pa·s (10s⁻¹), density 1.42g/cm³, 20kg drum, 12-month shelf product has become the core gap for domestic RT-cure F-LSR localization. Addressing this "fluoro-silicone RT-cure" pain point, Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches RT-Cure Liquid Fluorosilicone Rubber IOTA FLSR3435 (vinyl polyfluorosiloxane base + low-H fluorosilicone crosslinker + Pt catalyst + filler-reinforced two-part addition F-LSR). Characterized by "A/B pale-yellow liquid, A 350/B 300Pa·s (10s⁻¹), density 1.42g/cm³, 35 Shore A, 8.1MPa tensile, 320% elongation, 14.5kN/m tear, 36% resilience, 21% compression set (177℃×22h), 24.0% Fuel C swell (25℃×72h), 1:1 mix degas → 25℃±5℃×48h full cure, 20kg PE drum, cool dry 12 months, no N/P/S/heavy metal contact," and backed by "vinyl fluoro-backbone oil-resist + low-H crosslink + Pt RT-vulcanize + filler balanced strength," it serves as the "fluoro-silicone anchor" for oil-resistant seals in aerospace/auto/NEV fields. Molecular Architecture: Vinyl Fluoro-Backbone + Low-H Crosslink + Pt RT-Cure 3D Logic The core competitiveness of IOTA FLSR3435 stems from its "vinyl-terminated poly(methyltrifluoropropyl)siloxane as A base, low-H fluorosilicone as B crosslinker, Pt complex catalyzed, fumed silica/CaCO₃ reinforced" two-part architecture:

• Vinyl Fluoro-Backbone Oil-Resist: Trifluoropropyl (–CH₂CH₂CF₃) side groups grant extreme non-polar media resistance—Fuel C (70% iso-octane+30% toluene) 72h@25℃ volume swell only 24.0%, far below VMQ >150% and NBR >80%; Si-O-Si backbone retains -60℃ flexibility and 200℃ long-term service.
• Low-H Crosslink + Pt RT-Cure: B-component Si-H reacts with A vinyl under Pt catalyst at 25℃±5℃, fully crosslinked in 48h; low-H design yields moderate crosslink density—hardness 35A, elongation 320%, resilience 36%, balancing soft seal with compression resistance (21% at 177℃×22h).
• Filler Balanced Strength: Fumed silica + CaCO₃ reinforcement gives 8.1MPa tensile, 14.5kN/m tear—meeting O-ring/gasket mechanical demands; 350/300Pa·s (A/B) keeps flow after 1:1 mix, fit for casting/brushing/dip.

Performance Leap: From "VMQ Oil-Swell" to "Fluoro-Silicone 48h RT-Cure Fuel C 24%" Incorporating IOTA FLSR3435 enables qualitative leaps:

• Aerospace Fuel Seal: Aircraft fuel system O-rings, tank gaskets—RT cast cures, Fuel C swell ≤24%, flexible at -55℃, replaces FKM molded parts (high-temp cure, costly tooling).
• Auto Turbo Hose: Charge air cooler hose inner coat/extrusion—resists engine oil mist + turbo hot air (177℃), 21% compression set ensures long-term no-leak.
• NEV Battery Pack Seal: Coolant (glycol/water/PAO) no swell, RT field-pour repair, no oven needed.
• Industrial Oil Gasket: Pump/valve seals, chemical pipe gaskets—ASTM #3 oil/IRM 903 resistant, RT cure cuts energy.

Application Penetration: From Aircraft Tank to Battery Pack IOTA FLSR3435 covers sectors triply sensitive to "RT-cure + non-polar oil-resist + wide-temp seal":

• Aerospace: Fuel system seals, tank liners, hydraulic oil-resistant washers.
• Automotive: Turbo hoses, crankshaft seals, transmission seals, NEV battery pack gaskets.
• Petrochemical: Oil-resistant pipe joints, pump seals, valve liners.
• Electronics: Oil-resistant potting, offshore cable joint sealing.

IOTA Technical Guide: 1:1 Mix Degas, 48h RT-Cure

• Mixing: A:B=1:1 by weight, hand/mech stir 3-5min until uniform color, vacuum degas (-0.095MPa×5-10min); pot life ~2-4h@25℃, then thickens.
• Cure: 25℃±5℃, RH<70%, stand 48h full cure; accelerate with 60℃×2h or 80℃×1h post-cure (RT cure already fits most field jobs).
• Substrate Prep: Clean metal/plastic oil-free, sandblast or solvent wipe; for better adhesion pair with IOTA 3954 adhesion promoter (prior product).
• Taboo Red Line: No contact with N/P/S/heavy metal compounds (amines, thiols, organotin, lead salts)—Pt poison causes no-cure; mixed leftover not recyclable, dispose as general chemical waste.
• Storage: 20kg PE drum (A/B separate or kit); cool dry unopened; shelf 12 months, retest appearance/viscosity/cure properties and extend if qualified; general chemical (non-haz), away from heat/spark.

Industry experts note that under aerospace fuel-seal "RT form-in-place" replacing molding, auto turbo "oil-resist + wide-temp", and NEV "no-oven seal" triple trends, RT-cure two-part fluorosilicone rubbers are upgrading from "Dow/Momentive/Shin-Etsu import followers" to "Fuel C-resistant sealing reference materials." IOTA FLSR3435, with its "1:1 mix + 8.1MPa + 14.5kN/m tear + Fuel C 24% + 177℃ comp 21%" hard metrics, fills the domestic supply chain gap for RT-cure liquid fluorosilicone in aerospace/auto/NEV oil-resistant sealing fields, providing a mass-producible path to replace imported Dow Sylgard 184 F-series, Momentive FLSR for downstream seal makers and aerospace suppliers. This confirms domestic fluorosilicone rubbers are advancing steadily along "high-temp FKM → addition LSR → RT-cure F-LSR," with growing technical say in oil-resistant wide-temp sealing key materials.