In the 2-part addition-cure potting spectrum, the "polysiloxane backbone with 3,3,3-trifluoropropyl side groups (–CH₂CH₂CF₃)" and "Pt-catalyzed vinyl-SiH 1:1 addition network" jointly dictate volume-swell boundary in ASTM IRM903 hot oil (150℃×168h), Fuel C (60℃×168h), FAM B aviation medium, elastic retention across -60~200℃ cycles, and 3000-10000mPa·s self-leveling degassing in dense component cavities. Plain VMQ potting swells >40% in IRM903, >60% in Fuel C—fuel-system sensors crack; epoxy is heat-ok but brittle and oil-soft; PU dissolves in diesel. As NEV control modules (MCU/VCU/BMS), aircraft fuel-system electric parts, marine oil sensors, and chemical transmitters demand "2-part 1:1, RT cure 24-72h, translucent, density 1.40, Shore A 38, tensile 2.5MPa, elong 135%, IRM903 swell 2.9%/Fuel F diesel 1.8%/Fuel C 13.8%/FAM B 17.5%, avoid N/S/P/heavy-metal," sourcing a 10kg×2 drum, 12-month cool-dry product has become the core gap for domestic oil-resistant potting localization. Addressing this "fluoro oil-resistant" pain point, Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches Fluorosilicone Potting Adhesive IOTA FLSR8040 (2-part addition-cure polyfluorosiloxane, A/B translucent 10kg each). Characterized by "1:1 mass ratio, mixed visc 25℃ 3000-10000mPa·s, pot-life 25℃ 2-4h, cure 25℃ 24-72h, density 1.40g/cm³, Shore A 38, tensile 2.5MPa, break elong 135%, IRM903(150℃×168h) 2.9%, Fuel F diesel(40℃×168h) 1.8%, Fuel C(60℃×168h) 13.8%, FAM B(60℃×168h) 17.5%, moisture/dust/shock/insulation/FR, avoid N/S/P/heavy-metal, 10kg PE×2, 12mo cool-dry," and backed by "trifluoropropyl oil-repel + Pt addition no-byproduct + 38A/135% tough-elastic," it serves as the "fluorosilicone anchor" for fuel-contact electronic potting. Molecular Architecture: Trifluoropropyl Repel + Pt Addition No-Byproduct + 38A/135% Tough-Elastic 3D Logic The core competitiveness of IOTA FLSR8040 stems from its "Part A: vinyl-polyfluorosiloxane + fumed silica; Part B: SiH-polyfluorosiloxane crosslinker + Pt catalyst (Karstedt), side chain –CH₂CH₂CF₃" architecture:

• Trifluoropropyl Repel： F atom high electronegativity, low critical surface tension (~25mN/m), hydrocarbon fuel/lube hardly wets-diffuses—IRM903 168h only 2.9% swell (vs VMQ >40%), Fuel F diesel 1.8%; this is why it enters fuel-system control boxes; meanwhile –Si–O–Si– keeps flexible, no crystallize at -60℃.
• Pt Addition No-Byproduct： A/B 1:1 mix, end-vinyl + SiH under Pt give –Si–CH₂CH₂–Si–, no alcohol/water/acetic acid, zero shrinkage, no corrosion, thick-layer (>10mm) RT cure no crack—ideal for precision component encapsulation.
• 38A/135% Tough-Elastic： Shore A 38 mid-hard (above gel, below struct-adhesive), tensile 2.5MPa + elong 135% means no brittle crack in thermal cycle, no flow in soft state; CTE shear on ceramic cap/metal lead/PCB moderate, self-levels after degas.

Performance Leap: From "VMQ Fuel-Crack" to "Fluorosilicone IRM903 2.9%" Incorporating IOTA FLSR8040 enables qualitative leaps:

• NEV Hybrid Fuel System： High-pressure pump controller, canister solenoid driver, gearbox oil-temp sensor—long-term diesel/Fuel C vapor contact, after 150℃×168h gel no soften no delaminate, IRM903 swell <3%.
• Aircraft Fuel Electric Parts： Tank level transmitter, fuel-pump Hall element—fits aviation fluorosilicone sealing direction (ref. HM804 -55~230℃), FAM B swell 17.5% still insulating (vs plain silicone >40% leakage spike).
• Marine/Chemical Oil Sensor： Oil-tank temp probe, hydraulic level switch, 40℃ diesel 168h volume change 1.8%, far beats epoxy/PU.
• General Industrial： PSU module, ignition coil, magnetic sensor—moisture/dust/shock proof, 3-5× longer oil-life than RTV silicone.

Application Penetration: From BMS Board to Aircraft Tank Transmitter IOTA FLSR8040 covers sectors triple-sensitive to "fuel/hot-oil contact + RT self-level + electrical insulation":

• Automotive Electronics： Hybrid ECU, fuel-pump control, gearbox sensor, EV thermal board (coolant oil contact).
• Aero/Aviation： Fuel-system electric parts, wing-tank sensor, aviation hydraulic valve coil (ref. AVIC HM804 scene).
• Marine/Energy： Diesel ECU, oil-level transmitter, wind-gearbox oil probe.
• Industrial Control： Explosion-proof solenoid coil, chemical level gauge, downhole oil-field circuit cartridge.

IOTA Technical Guide: 1:1 Weigh, Vac Degas, Avoid Poisoners

• Mix： A/B 1:1 by mass (err <2%), hand/planetary stir 3-5min to translucent uniform, vac degas (-0.095MPa×3-5min); 25℃ pot-life 2-4h, over-time thickens hurt fill.
• Potting： Substrate degrease-dry (fluorosilicone primer optional for adhesion), gravity level or low-pressure pour; >5cm thickness suggest two-pass to avoid center exotherm.
• Cure： 25℃ 24-72h full cure; accelerate 60℃×2h or 80℃×1h post-cure, but Pt system avoid >150℃ abrupt heat causing surface Pt segregation.
• Taboo Red Line： Strictly no contact with N (amines/amides), S (thiols/sulfides), P (phosphines), heavy-metal (Sn/Pb/Hg/Zn organic salts)—these poison Pt catalyst causing "no cure / partial cure"; tools exclusive to fluorosilicone, never share with epoxy/PU; unused A/B reseal separately prevent cross-contamination.
• Storage： A/B 10kg PE drum each; cool dry (<30℃) dark, unopened 12 months; non-haz general chemical but contains Pt catalyst, don't pour waste into drain; ventilate, nitrile gloves for prolonged skin contact with uncured gel.

Industry experts note that under hybrid/ICE electronic oil-life target 10yr/240k km, and domestic aircraft fuel-system parts replacing imported Dow Corning 3-6578/Fluorosilicone RTV, 2-part RT-cure fluorosilicone potting is upgrading from "Dow/Momentive import followers" to "fuel-contact electronic protection reference gel." IOTA FLSR8040, with its "1:1 RT-cure + 3000-10000cps + IRM903 2.9% + Fuel F 1.8% + Shore A 38/elong 135% + 12mo" hard metrics, fills the domestic supply chain gap for fluorosilicone potting in fuel-system ECU / aviation tank-sensor fields, providing a mass-producible path to replace imported fluorosilicone pottings for downstream auto-electronics, aviation-accessory, and sensor makers. This confirms domestic oil-resistant pottings are advancing steadily along "epoxy (no oil) → VMQ (fuel-crack) → addition fluorosilicone (IRM903 <3% swell)," with growing technical say in fuel-contact electronic protection key materials.