In the seal-parts addition-cure LSR spectrum, the "symmetric 1:1 ratio (A 280-380 / B 250-350 mPa·s@23℃·10s⁻¹) with seven hardness grades (10/20/30/40/50/60/70A)" and "Pt-locked-in-A + vinyl/SiH B addition no-byproduct" jointly dictate pump stability in LIM cold-runner, fast-cure efficiency at 150-200℃ tens-of-seconds, and mold-release / compression-set boundary in O-rings/oil-seals/complex misc seals. Plain HTV needs preheat compression minute-class; condensate RTV room-cure but high shrink poor compression fatigue; single-hardness LSR can't cover ultra-soft lip to hard valve seat. As auto cylinder seals, hydraulic cylinder oil-seals, outdoor comms waterproof joints, and medical valve discs demand "2-part 1:1, seven-grade 10-70A, tensile 5-10MPa, tear 12-40kN/m, elong 340-800%, excellent release, rapid heat cure, A/B 200kg drum, <23℃ 12mo," sourcing a seven-grade universal domestic product has become the core gap for seal LSR localization.
Addressing this "inj-seal seven-grade" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Seal-Parts Addition LSR IOTA LSR 3055 (2-part Pt-cured methylvinyl polysiloxane, A/B translucent viscous, seven branches 3055-10~3055-70). Characterized by "pre-cure A:B 1:1 (wt), A visc 280-380/B 250-350mPa·s (23℃·10s⁻¹), same-batch mix; post-cure density 1.08-1.14, hardness 10-70A, tensile 5-10MPa, elong 340-800%, tear 12-40kN/m (3055-50 peak 10MPa/40kN/m), Pt in A, excellent mold-release, rapid heat cure (150-200℃ tens-of-sec), A/B 200kg drum, <23℃ unopened 12mo," and backed by "1:1 symmetric pump + Pt no-byproduct zero-shrink + seven-grade coverage + release fast-cure," it serves as the "inj-seal anchor" for O-rings/oil-seals/complex injection misc-parts.
Molecular Architecture: Pt Locked A + 1:1 Cold-Runner Pump + Seven-Grade Fumed-Silica 3D Logic
The core competitiveness of IOTA LSR 3055 stems from its "Part A: vinyl polysiloxane + fumed silica + Pt catalyst (Karstedt, locked in A); Part B: SiH polysiloxane crosslinker + fumed silica + inhibitor" architecture:
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Pt Locked A Anti-Cross-Poison： Pt only in A, B pure crosslink side, LIM meter pump 1:1 through static mixer, cold-runner (5-10℃) prevents precure; A independent drum lowers poison risk, color into B then A, no cross-batch.
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1:1 Symmetric Low-Visc Pump： Seven grades all 250-380mPa·s (10s⁻¹) "LIM low-visc class"—two orders thinner than screen/scrape gums (26k-86k), fills 0.3mm thin-wall, undercut, micro-odd cavity no short-shot; 1:1 tolerance wide, auto-line forgiving.
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Seven-Grade Fumed Silica： Tune fumed SiO₂ loading + vinyl distribution for continuous 10A (elong 800%/tear 12) → 70A (elong 340%/tear 32); 10-20A ultra-soft lip/vibration pad, 40A general O-ring main, 50A tear peak 40kN/m balanced tough, 60-70A high-hard valve/seat wear-seal; no plasticizer, low compression set.
Performance Leap: From "HTV Minute-Class" to "LSR 3055 150℃ Tens-Sec Release"
Incorporating IOTA LSR 3055 enables qualitative leaps:
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Auto & Hydraulic： Engine head gasket strip, cylinder oil-seal, gearbox O-ring—pick 3055-40/50, 150-180℃×30-60s inject cure, non-stick release, engine-oil/ATF aging ok.
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Electronic Waterproof： Outdoor 5G antenna joint seal, NEV charger connector gasket—pick 3055-30/40, LIM multi-cavity thousands/hr, IP68 hold.
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Complex Misc： Medical valve disc with undercut, two-shot overmold seal, odd vacuum gasket—pick 3055-20/60 dual-shot soft/hard, 0.3mm thin no miss.
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Industrial General： Pump mech-seal bellows, pneumatic diaphragm, food-machine silicone ring (3055-10/20 soft touch).
Application Penetration: From Cylinder Oil-Seal to 5G Waterproof Ring
IOTA LSR 3055 covers sectors triple-sensitive to "LIM injection + seven-grade hardness + release fast-cure":
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Automotive： Cabin seal strip, oil-seal, turbo hose clamp pad, battery-pack waterproof ring.
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Hydraulic & Engineering： Cylinder main seal, guide band, rotary joint seal.
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Electronics Comm： Waterproof connector, antenna radome seal, charger coupler ring.
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Medical & Food： Pump-valve silicone, infusion seal, food-machine ring (soft grade).
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Industrial Misc： Pneumatic diaphragm, vacuum gasket, complex injection misc-part.
IOTA Technical Guide: Same-Batch 1:1, Cold-Runner 5-10℃, Avoid N/S/P/Sn
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Mix & Pump： LIM line A/B same batch 1:1 meter (err <2%), static mixer homogenize, cold-runner 5-10℃ anti-precure; stir original drum before transfer (fumed silica slight settle on long rest).
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Color Rule： Paste into B, stir, then mix A; never into A, never cross-batch.
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Cure Window： Mold 150-200℃ (common 170-180℃), thin <1mm tens-sec, thick 2-3mm 1-2min; excellent release auto-demold no ejector; optional 150℃×1h anneal.
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Taboo Red Line： Absolute isolation from Pt poisons—nitrogen (amines/ammonia/urea), sulfur (thiols/sulfides/latex gloves/some mold release), phosphorus (phosphines/phosphate esters), organotin (condensate curatives), heavy metals (Pb/Hg/Sn salts), acid/alkali/water/alcohol; LIM equipment exclusive, no epoxy/PU/RTV/HTV condensate co-line; mold polished stainless (S136 class), no bare-hand sweat on wet gum.
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Storage： A/B 200kg iron drum each; unopened <23℃ cool dry dark, shelf 12 months, over-shelf test visc/cure/hardness/tear and extend if qualified; non-haz general chemical, ventilate, nitrile gloves.
Industry experts note that under auto-electrification (battery-pack IP67 ring), hydraulic import-substitution, and medical seal LIM-ization triple-cycle, seal-dedicated LSR is upgrading from "Wacker ELASTOSIL® LR 3000 / Momentive Silopren® LSR 7000 import followers" to "1:1 seven-grade release fast-cure reference inj-seal glue." IOTA LSR 3055, with its "A:B 1:1 + seven-grade 10-70A + 3055-50 peak 10MPa/40kN/m + Pt-in-A + release fast-cure + 200kg×2 + 12mo" hard metrics,
fills the domestic supply chain gap for seal-dedicated addition LSR in LIM O-ring/oil-seal/complex-misc fields, providing a mass-producible path to replace imported seven-grade LSR for downstream seal-makers. This confirms domestic seal LSR is advancing steadily along "HTV compression (minute-class) → condensate RTV (room-shrink) → single-hardness addition LSR → 1:1 seven-grade inj-seal 3055 (release fast-cure)," with growing technical say in liquid-injection seal key materials.
