In the polymer-derived ceramic (PDC) resin spectrum, the combination of "Si–N backbone (silazane)" and "vinyl (Vi) end-group dual UV/thermal cure" jointly dictates adhesion to metal/alloy/glass/plastic, post-pyrolysis ceramic yield, and extreme-temp service ceiling. Conventional polysiloxane coatings max out at 350-400℃ continuous—above that they chalk and spall; pure Si–N polysilazanes (e.g., IOTA 9130 series) withstand higher heat but are too viscous for thin films and poorly adhere to low-surface-energy plastics like PP/PC. As aero-engine hot-section parts, nuclear seals, 800℃ electronic transient protection, and automotive exhaust long-life varnishes demand "low-viscosity easy-apply, Vi photo/thermal dual-cure, pyrolysis ceramic density 1.60-2.00g/cm³, visible-light transmittance >95%," sourcing a vinyl-terminated polysilazane with Mn 1200-1400, viscosity 10-40cP, density 0.98-0.99g/cm³, 800℃ ceramic yield 50-60% has become the core gap for domestic PDC resin localization. Addressing this "low-vis high-ceramic" pain point, Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches Organic Polysilazane IOTA 9118 (vinyl-terminated liquid polysilazane, equivalent Merck Liquicoat PN / Evonik Durazane series). Characterized by "light yellow transparent liquid (cured coating colorless transparent), Mn 1200-1400, solids ≥99%, density 0.98-0.99g/cm³, viscosity 10-40cP, ceramic density 1.60-2.00g/cm³, cured hardness 6-7H, water contact 100-105°, 800℃ varnish recommended / 1600℃ main-coat recommended, ceramic yield 50-70%, visible transmittance >95%, cross-hatch 0-grade, 12-month shelf (0-20℃ N₂-sealed)," and backed by "Si–N backbone ceramic precursor + Vi photo/thermal dual-cure + low-vis high-clarity," it serves as the "polysilazane anchor" for high-temp coatings, PMC composites, glass/abrasive, and low-surface-energy easy-clean fields. Molecular Architecture: Si–N Backbone + Vi Termini + Low-DP Narrow-MWD 3D Logic The core competitiveness of IOTA 9118 stems from its "backbone of –Si(R)–NH– repeating units, vinyl (–CH=CH₂) termini, Mn 1200-1400 liquid polysilazane" PDC architecture:

• Si–N Backbone Ceramic Precursor: Si–N bond energy ~470kJ/mol, above Si–O (446) and C–C (358); pyrolysis under inert/NH₃ yields Si₃N₄/SiC nano-ceramics; in air at 800℃ forms SiOCN multiphase ceramic; cracking threshold 100μm+, amorphous below 1400℃, begins crystallizing above 1400℃.
• Vi Termini Photo/Thermal Dual-Cure: Vinyl crosslinks under Pt catalysis (80-100℃), peroxide (120-180℃), or radical photoinitiator; ambient-cures slowly (3 days still soft), avoiding 1K gel; UV-cure fits low-temp substrates (plastics/paint films) but yellows >300℃—high-temp scenes must use thermal cure.
• Low-DP Narrow-MWD High-Clarity: Mn 1200-1400 gives 10-40cP viscosity for nano-film dip-coating; after cure additives release, coating is colorless transparent, visible >95%—fits optical windows and transparent heat-resistant varnish.

Performance Leap: From "Silicone 400℃ Ceiling" to "Polysilazane 1600℃" Incorporating IOTA 9118 enables qualitative leaps:

• 800℃ Varnish Long-Life: Single 20-50μm on metal/ceramic, 250℃×1h thermal cure—800℃×100h no spall/crack, oxidation gain <5%, fits exhaust/muffler/boiler sight-glass.
• 1600℃ Main-Coat Short-Term: With ceramic fillers (SiC/BN) as matrix, service temp in inert/vacuum reaches 1600℃—fits aerospace hot-section transient flame protection.
• Plastic Low-Energy Adhesion: Direct cross-hatch 0-grade on PP/PC/PVC/PMMA—one of few PDC resins bonding low-polarity plastics, ideal for electronics flame-retardant transparent coat.
• Easy-Clean Low-Surface: Post-cure water angle 100-105°, oil non-wetting, wipes clean—fits range-hood panels, medical device shells.

Application Penetration: From Exhaust Pipe to Aerospace Hot-Section IOTA 9118 covers sectors doubly sensitive to "PDC precursor + low-vis high-clarity":

• High-Temp Coatings: Auto exhaust/muffler, industrial oven shell, chimney liner, boiler sight-glass heat-resistant varnish.
• Composites: PMC (PMMA/PC flame-retardant reinforcement), non-combustible composite matrix.
• Optical & Abrasive: Glass hard-coat, abrasive wheel binder, optical element anti-reflective/heat film.
• Easy-Clean: Kitchen appliance panel, medical instrument shell, low-surface-energy anti-fouling varnish.

IOTA Technical Guide: N₂-Seal Moisture-Avoid, Photo/Thermal Per Scene

• Thermal Cure 3 Options: ①No catalyst 250-350℃×0.5-2h; ②Add peroxide crosslinker 120-180℃×10-30min (no effect on hardness/color/adhesion); ③Add Pt catalyst 80-100℃×1-2h (fastest tack-free).
• UV Cure: Add cleavage photoinitiator, ambient UV—fits plastics/paint films; CAUTION: UV-cured coating yellows >300℃, avoid UV route for high-temp service.
• Application: Brush/dip/spray/curtain coat; recommended DFT 20-50μm (thicker cracks at high temp); substrate must be dry oil-free.
• Taboo Red Line: Uncured product: keep away from fire, humid air, water (Si–N slowly hydrolyzes releasing NH₃); after opening, container must be N₂/Ar-purged and resealed promptly; unused formulated product cannot be recycled, dispose per local regs; Pt catalyst may complex with N–H polysilazane and deactivate—pilot first.
• Storage: 100ml/1L/5L metal containers, 0-20℃ N₂-sealed refrigeration, shelf 12 months; wear gloves/mask; cured coating solvent-impervious (wipe with acetone/mineral spirits before cure); general chemical management.

Industry experts note that under the explosive growth of aero-engine hot-section ceramicization, nuclear high-temp seals, and consumer electronics flame-retardant transparent coatings, vinyl polysilazanes are upgrading from "Merck/Evonik import followers" to "photo/thermal dual-cure PDC reference resins." IOTA 9118, with its "Mn 1200-1400 + 10-40cP low-vis + ≥99% solids + visible >95%" hard metrics, fills the domestic supply chain gap for organic polysilazanes in 800℃ varnish and 1600℃ main-coat fields, providing a mass-producible path to replace imported Merck Liquicoat PN, Evonik Durazane for downstream high-temp coating and composite enterprises. This confirms domestic PDC resins are advancing steadily along "Si–N backbone → Vi dual-cure → low-vis high-clarity," with growing technical say in extreme-temp protection key materials.