In the addition-cure F-LSR RT-vulcanization spectrum, the "vinyl polyfluorosiloxane backbone (trifluoropropyl –CH₂CH₂CF₃ side-embedded)" and "low-oligomeric H-fluorosilicone (Si-H terminated short chain, homologous with fluoro-base)" jointly dictate RT Pt-catalyzed hydrosilylation rate, volume-swell boundary against Fuel C (iso-octane/toluene 70:30), and compression-set retention at 177℃×22h. Conventional VMQ swells >150% in non-polar oil; FKM brittle <-20℃ and cannot RT-cure; standard LSR cures RT but lacks fluorosilicone oil resistance. As aero fuel seals, auto turbo hose repair, NEV battery coolant seals, and electronic potting demand "2K 1:1, 25℃±5℃×48h full cure, Fuel C swell ≤24%, tensile ≥8MPa, tear ≥14kN/m, 35A, 177℃ comp ≤21%, A/B 20kg drum," sourcing a pale-yellow A/B, A 350/B 300Pa·s (10s⁻¹), density 1.42g/cm³, 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 FLSR7435 (vinyl polyfluorosiloxane base + low-oligo H-fluorosilicone crosslinker + fumed silica + Pt catalyst, two-part addition F-LSR; derivative of same platform as FLSR3435, 7435 is the vendor-published main name). Characterized by "A/B pale-yellow, A 350/B 300Pa·s (10s⁻¹), density 1.42g/cm³, 35 Shore A, 8.1MPa tensile, 320% elong, 14.5kN/m tear, 36% resilience, 21% comp set (177℃×22h), 24.0% Fuel C swell (25℃×72h), 1:1 mix degas → 25℃±5℃×48h full cure, A/B 20kg PE drum, cool dry 12 months, no N/P/S/heavy metal," and backed by "vinyl fluoro-backbone oil-resist + oligo fluoro-H crosslink compatible + Pt RT-vulcanize + filler balanced strength," it serves as the "fluoro-silicone anchor" for oil-resistant seals in aero/auto/NEV/electronics fields. Molecular Architecture: Vinyl Fluoro-Backbone + Oligo Fluoro-H Crosslink + Pt RT-Cure 3D Logic The core competitiveness of IOTA FLSR7435 stems from its "vinyl-terminated poly(methyltrifluoropropyl)siloxane as A base, oligo H-fluorosilicone as B crosslinker, Pt complex (Karstedt) catalyzed, fumed silica reinforced" two-part architecture:

• Vinyl Fluoro-Backbone Oil-Resist: Trifluoropropyl side groups grant extreme non-polar resistance—Fuel C (25℃×72h) swell only 24.0%, far below VMQ >150% and NBR >80%; Si-O-Si backbone retains -60℃ flexibility and 200℃ long-term service, 177℃×22h comp set only 21%.
• Oligo Fluoro-H Crosslink Compatible: B uses H-fluorosilicone (not plain H-silicone)—trifluoropropylmethylsiloxane segments match base solubility parameter, avoiding phase separation/incomplete cure seen with plain Si-H in fluoro-base; oligo short-chain tunes moderate crosslink density—35A, 320% elong, 36% resilience.
• Pt RT-Cure: After A/B mix, hydrosilylation under Pt at 25℃±5℃ fully crosslinks in 48h; no low-MW byproduct, no condensate water/alcohol—fits electronic potting and enclosed cavity form-in-place; 350/300Pa·s (A/B) keeps flow after 1:1 mix for cast/brush/dip.

Performance Leap: From "VMQ Oil-Swell" to "Fluoro-Silicone 48h RT-Cure Fuel C 24%" Incorporating IOTA FLSR7435 enables qualitative leaps:

• Aero Fuel Seal: Aircraft fuel-system O-ring, tank seam field trowel—Fuel C 72h swell 24%, flexible at -55℃, replaces FKM molded parts (high-temp cure, costly tooling).
• Auto Turbo/Transmission: Charge-air hose field repair potting, crankshaft seal face coat—resists engine oil mist + 177℃ hot air, 21% comp set ensures long-term no-leak.
• NEV Battery Pack: Coolant (glycol/water/PAO) no swell, RT field potting/repair, no oven needed.
• Electronic Potting: Sensors, connectors, small relays—excellent volume resistivity, low dielectric loss, oil/hydraulic resistant, 48h RT cure cuts ~30% energy vs heat-cure.

Application Penetration: From Aircraft Tank to Battery Pack IOTA FLSR7435 covers sectors triply sensitive to "RT-cure + non-polar oil-resist + wide-temp seal":

• Aerospace: Fuel-system seals, integral tank seams, hydraulic oil-resistant washers.
• Automotive: Turbo hose repair, transmission/crankshaft seals, NEV battery gaskets.
• Petrochemical: Oil-resistant pipe joints, pump/valve seals, field-formed gaskets.
• Electronics: Oil-resistant potting, offshore cable joint seal, sensor encapsulate.

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

• Mixing: A:B=1:1 by weight, mech stir 3-5min 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 acetone/IPA wipe; for better adhesion pair with IOTA 3954-class promoter.
• Taboo Red Line: No N/P/S/heavy metal contact (amines, thiols, organotin, lead salts)—Pt poison causes incomplete/no cure; mixed leftover not recyclable, dispose as general chemical waste.
• Storage: A/B 20kg PE drum separate; cool dry unopened; shelf 12 months, retest appearance/viscosity/cure and extend if qualified; general chemical (non-haz), away from heat/spark.

Industry experts note that under aero 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 FLSR7435, 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 aero/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 aero MROs. 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.