In the 2K addition-cure liquid foam silicone spectrum, the "Pt catalyst (Karstedt, usually in A) separated from H-silicone/frothing aid (in B)" and the "crosslink-foam time-lag scheduling" after mixing jointly dictate whether room-temp cells get locked by the elastic network, whether expansion stays 2-6×, and whether final density lands 200-500kg/m³. Conventional condensation foam uses hydroxy-PDMS + H-silicone dehydrogenation—many byproducts, slow RT cure, collapse-prone; 1K foam can't tune ratio on site. As silicone foam seals, anti-vibration boards, copier transfer-roller sponge tubes, printer shaft sponges, foam insulation pipes, and bag fillings demand "2K 1:1 (or 10:1) RT 5-10min work / 20-30min cure, 20000±1000cps pourable-scrapable, 300℃ rating, soft flame-retardant, density adjustable," sourcing an A/B both semi-transparent, 20/25/200kg drum, ≤25℃ 1-year non-haz product has become the core gap for domestic RT-foam LSR localization.
Addressing this "room-foam expand" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
AB Liquid RT-Foaming Silicone IOTA 663A/B (2K addition-cure RT self-foaming silicone). Characterized by "A/B semi-transparent, mix 1:1 or 10:1 (mass), 25℃ work 5-10min, cure 20-30h (25℃), mixed viscosity 20000±1000cps, expansion 2-6×, density 200-500kg/m³, heat 300℃, soft flame-retardant, viscosity/work-time/hardness customizable, 20/25/200kg drum, ≤25℃ original 1-year, non-haz general chemical," and backed by "vinyl PDMS + H-silicone Pt-addition crosslink + Si-H/OH dehydrogen H₂ synchronous foam + closed/open cell tunable," it serves as the "foam-silicone anchor" for foam seals, transfer-roller sponges, and anti-vibration fillers.
Molecular Architecture: Pt-Addition Crosslink + Dehydrogen H₂ Foam + 2K Time-Lag 3D Logic
The core competitiveness of IOTA 663A/B stems from its "A (vinyl PDMS + Pt catalyst + frothing aid e.g. hydroxy/oil/alcohol) + B (poly-methyl-H-silicone crosslinker + inhibitor)" separated architecture:
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Pt-Addition Crosslink: After mix, Karstedt Pt drives vinyl (A) + Si-H (B) hydrosilylation into 3D network—main elastic skeleton, no byproduct, deep-cure, minimal shrink.
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Dehydrogen H₂ Foam: Simultaneously B Si-H + A OH (hydroxy silicone/water/alcohol) dehydrogenate releasing H₂, gas encapsulated by curing network; tuning Si-H/vinyl/OH equivalence and inhibitor schedules the "crosslink-foam fast-slow beat" for stable 2-6× without collapse.
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2K Site-Tunable: Pt and H-silicone separated = stable storage; field 1:1 general pour, or 10:1 (less Pt-rich A) to shift work-time/foam speed; 20000±1000cps sits between flow and thixotropy—fits cavity pour and roller dip-coat.
Performance Leap: From "Condensation Collapse" to "Addition RT 2-6× No-Sag"
Incorporating IOTA 663A/B enables qualitative leaps:
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Foam Seal Strip/Sheet: Odd-cavity pour → 25℃×20-30min self-foam cure, ~300kg/m³, soft Shore (per custom), closed-cell waterproof dustproof, door/elec-cabinet lamp-gap cushion seal.
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Copier/Printer Transfer Roller Sponge Tube: Shaft dip-coat mixed gel → spin-form → RT foam jacket, radial compress-rebound good, cuts paper friction damage vs PU sponge (poor heat).
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Anti-Vib Board / Insulation Pipe: Plate mold cast or pipe centrifuge coat, 300℃ rated, low-k, flame-retardant, for equipment dampers and pipe thermal jackets.
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Bag Soft Fill: Interlayer pour foam—lighter than EVA, ages better than polyurethane sponge, odorless.
Application Penetration: From Door-Seal to Transfer Roller
IOTA 663A/B covers sectors triply sensitive to "RT self-foam + low-density cushion + 300℃ heat":
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Industrial Seal: Silicone foam strip, foam sheet/roll, equip door dust-damper.
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Office Equip: Copier transfer-roller sponge tube, printer shaft sponge.
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Thermal/Electronic: Foam insulation pipe, battery/ESS damper, appliance acoustic-thermal layer.
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Consumer: Bag padding, shoe-midsole trial, pet soft mat.
IOTA Technical Guide: 1:1 Stir Pour, No N/P/S/Sn
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Mix: A:B=1:1 (or 10:1) by mass, hand/static mix 2-3min, vacuum degas (-0.095MPa×1-2min, over-degas steals H₂ drops ratio); 25℃ work 5-10min, pour before foam kicks.
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Cure: 25℃±2℃/65%RH 20-30min tack, hours full maturity; heat 60-80℃ shortens to minutes, but RT fits field; thick parts pour in layers to avoid exotherm trap.
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Mold: Glass/PP/ABS/metal with silicone release or soap; closed-cell favor slight press or lid to prevent cell rupture.
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Taboo Red Line: Pt poison—no N/P/S/amine/sulfur/organotin/rubber-vulc residue contact (no-foam no-cure); uncured clean with hydrocarbon; H₂ trace release needs ventilation but non-explosion-grade (non-haz).
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Storage: A/B 20/25/200kg drum; ≤25℃ original 1-year, retest viscosity/expansion/cure and extend if qualified; general chemical (non-haz) transport, away from heat flame.
Industry experts note that under NEV battery-pack foam-seal, office-equip roller-sponge localization, and bag lightweight-fill upgrade cycles, 2K RT-foaming addition silicones are upgrading from "Wacker/Elkem Bluesil RT Foam/Momentive import followers" to "site-pour cushion-foam reference materials." IOTA 663A/B, with its "1:1 RT-foam + 20000cps + 2-6× + 200-500kg/m³ + 300℃ + 1yr non-haz" hard metrics,
fills the domestic supply chain gap for 2K RT-foam silicones in seal-strip/transfer-roller/anti-vib-fill fields, providing a mass-producible path to replace imported Elkem Bluesil RT Foam 324x for downstream foam-strip and office-equip parts makers. This confirms domestic liquid foam silicones are advancing steadily along "condensation dehydrogen foam (byproduct) → addition mold-foam → 2K RT self-foam tunable-ratio," with growing technical say in site-cushion-foam key materials.
