In anti-graffiti façades, precious-metal anticorrosion, rail skins, semiconductor insulation, and plastic barrier waterproofing, acrylic or polyurethane clears apply fast and look good, but their nano-hardness and abrasion ceiling are limited; long outdoor service yellows and chalks, and anti-graffiti self-cleaning relies on additives while alkali/salt performance margins stay insufficient. Pure methyl silicone gives hydrophobic ease but not hydrophilic easy-clean plus ultra-hard cross-cut together; sol-gel silica can be hard and transparent, yet precursor hydrolysis control, thickness, and thermal-sensitive substrates often cause cracking or low conversion. For specifications demanding "liquid application, inorganic conversion, hydrophilic easy-clean, nano ultra-hard, cross-cut 0, stable at 800℃ in air", a perhydropolysilazane precursor places organic liquid convenience and inorganic ceramic protection on one thin-film platform. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches Perhydropolysilazane Liquid Coating Material IOTA-PHPS. Characterized by "perhydropolysilazane main component diluted in solvent; colorless transparent liquid; solids 20% (2–20% customizable); solvent n-butyl ether, filling also with xylene, dibutyl ether, or dichloromethane; 100% liquid density 1.16–1.31 g/ml, 20% liquid density 0.82–0.84 g/ml, cured density 1.6–2.0 g/ml; curing by Si-N hydrolysis to SiOx; room temperature >7 days, moist cure 90% RH, 150℃, 2 h; coating thickness >100 nm; ammonia cure hardness 3 GPa, modulus 60 GPa, high-temperature cure hardness 8–10 GPa, modulus 100–130 GPa; pencil 9H ChungHwa, 6H Mitsubishi; visible transparency >90%; cross-cut adhesion 0; air heat 800℃; strong rust, alkali, and brine resistance, 10% HCl about 1 month weak; for building anti-graffiti, precious-metal anticorrosion, rail transit, semiconductor insulation, electronic circuits, plastic barrier waterproofing; 1 L metal drum sealed with xylene/dibutyl ether/dichloromethane per order; spin/wipe/spray/dip then room or high-temperature cure; store below 10℃, unopened domestic 1 year, export 6 months, use soon after opening; ventilated dry work, gloves/mask/goggles, away from fire/humid air/water, professional waste disposal", backed by "perhydro Si-N precursor + n-butyl ether low-density application + hydrolytic ceramic conversion + multi-mode cure", it serves as a perhydropolysilazane coating for hydrophilic ultra-hard nano protection. System Positioning: Perhydropolysilazane Among Inorganic Hard Coatings Within hard-surface protection, IOTA-PHPS is a perhydro polysilazane precursor liquid coating, distinct from acrylic/polyurethane (fast decorative but limited nano-hardness and 800℃ stability), pure methyl silicone (hydrophobic ease but not hydrophilic easy-clean with ultra-hard cross-cut), sol-gel silica (SiO₂ hardness yet precursor hydrolysis, thickness, and thermal-sensitive adaptation less controllable than perhydro precursor), and organosubstituted polysilazane (better flexibility but partial organic carbon remains after conversion, different pure-inorganic hardness/transparency). IOTA-PHPS uses a fully hydrogenated backbone for low organic residue SiOx after hydrolysis, 20% n-butyl ether for low-viscosity spin/spray, and room/moist/high-temperature paths for thermal-sensitive plastic, metal/glass, semiconductor, and batch ovens. The positioning is a universal thin layer for "hydrophilic easy-clean + nano ultra-hard + insulation/barrier + 800℃ inorganic protection", rather than a single hydrophobic coating or single high-temperature ceramic paint. Molecular Architecture: Perhydro Si-N Backbone + n-Butyl Ether Low Density + Hydrolysis to Silanol + Condensation to SiOx IOTA-PHPS uses ≡Si–NH–Si≡ as main chain with Si–H dominant substituents as precursor. Si-N bonds are moisture-sensitive; hydrolysis generates silanol (Si–OH) with ammonia release, and silanol condenses into Si–O–Si, converting the organic precursor in situ to an inorganic SiOx thin layer. The perhydro structure leaves little organic carbon after conversion, the intrinsic base for hard, transparent, thermal, and dielectric stability. n-Butyl ether gives 20% solution density 0.82–0.84 g/ml and 100% precursor density 1.16–1.31 g/ml for metered low-viscosity spin and spray; cured density 1.6–2.0 g/ml reflects dense SiO₂-type network. Thickness >100 nm is adjusted by solids, passes, and dilution; ammonia-assisted room/moist cure gives moderate crosslinking, hard yet less brittle for thermal-sensitive parts; high-temperature moist or thermal cure promotes dehydrogenation, oxidation, and condensation into a ceramic-state network with much higher hardness and modulus. Performance Leap: From "Organic Not Hard, Silicone Not Hydrophilic, Sol-Gel Cracks" to "Perhydro Hydrolysis Inorganic Film" With IOTA-PHPS, nano-hard protection improves jointly: hydrophilic easy-clean—hydrolyzed SiOx presents abundant silanol, water film spreads to remove dust, graffiti, and oil, reducing manual cleaning on façades and rail skins; ultra-hard abrasion—high-temperature cure 8–10 GPa and 100–130 GPa, ChungHwa 9H, Mitsubishi 6H, ammonia cure still 3 GPa and 60 GPa for glass/metal/plastic hardening; transparency—visible >90% and colorless precursor keep substrate color for semiconductors, optics, and curtain walls; adhesion and environment—cross-cut 0 via SiOx-substrate hydroxyl condensation, with rust/alkali/brine resistance and 800℃ air stability, compensating organic paint thermal aging and inorganic brittleness gaps; process tolerance—solids 2–20%, spin/wipe/spray/dip, room >7 days or 90% RH/150℃/2 h acceleration, fitting both thermal-sensitive and production lines. Application Penetration: From Anti-Graffiti to Semiconductor and Barrier Packaging Building anti-graffiti: exterior walls, curtain walls, public surfaces—hydrophilic easy-clean, ultra-hard scratch resistance, transparent non-yellowing, graffiti removable by water cleaning. Precious-metal anticorrosion: gold/silver jewelry and precision metal parts—thin hard SiOx isolates air and sweat, anti-rust and oxidation without changing color. Rail transit: car bodies, interior panels, signage—9H-class abrasion, cleaner resistance, outdoor humidity-temperature cycles. Semiconductor insulation: chip passivation, wafer/device insulating layers, electronic circuit protection—high SiOx insulation, nano thickness control, low-temperature film capable; process by device thermal budget. Electronic circuits: PCB outer protection and connector anti-soil—cross-cut 0, humidity resistance, dielectric isolation. Plastic barrier waterproofing: PET/PP film oxygen/water barrier and hardening—low thickness non-cracking, transparent, n-butyl ether low-viscosity dip/spin; barrier values require verification by film thickness and substrate. IOTA Technical Guide: Clean Substrate, Thin Coats, Cure by Substrate IOTA-PHPS is a colorless transparent n-butyl ether solution, solids 20% (2–20% adjustable). Clean degrease and dry the substrate; lightly abrade metal, clean/activate glass and ceramic, evaluate plastic solvent resistance; use as-is or adjust with n-butyl ether/xylene/dibutyl ether/dichloromethane, spin for thickness, wipe for small areas, spray for large areas, dip for complex parts; for dry film >100 nm prefer multiple thin passes to control cracking. Cure options: thermal-sensitive plastic or no-oven parts use room humidity >7 days, or dilute ammonia to accelerate hydrolysis; general metal/glass use 90% RH, 150℃, 2 h moist cure for ammonia-type 3 GPa/60 GPa; ceramic ultra-hard use high-temperature cure for 8–10 GPa, 100–130 GPa, ChungHwa 9H, with peak temperature and dwell set by substrate trials. ⚠️ Taboo: store sealed below 10℃; unopened domestic 1 year, export 6 months, use soon after opening; work ventilated and dry with gloves, mask, goggles; keep uncured material from fire, humid air, and water to avoid premature hydrolysis; clean tools with suitable organic solvent before cure, because cured film cannot be removed by solvent; dispose waste per local rules through professionals. 1 L metal drum sealed, filling solvent per contract n-butyl ether/xylene/dibutyl ether/dichloromethane; thick coating tends to crack from cure shrinkage, so apply thin multiple passes. Industry Insight: The key to perhydropolysilazane nano hard film is not making the film thicker, but using Si-N hydrolysis rate for ceramic节奏, solids and passes for >100 nm without cracking, ammonia versus high-temperature cure for hardness/modulus range, and n-butyl ether low-density solution for spin/spray consistency. For building, electronics, and packaging engineers, IOTA-PHPS uses one perhydro precursor across anti-graffiti, precious-metal anticorrosion, rail, semiconductor insulation, circuit protection, and plastic barrier, taking cross-cut 0, >90% transparency, 800℃ air stability, 9H hardness, and SiOx inorganic conversion as batch-checkable anchors, reducing organic-clear low-hardness, silicone non-hydrophilic, and sol-gel cracking rework.