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Inorganic (perhydro) polysilazane IOTA PHPS is a hydrophilic super-hard stain-resistant nano-coating material based on perhydropolysilazane as the main component, stored diluted in solvent, appearing as a colorless transparent liquid with 20% solids content. The coating material cures mainly through hydrolysis of Si-N bonds, and the cured coating consists of SiOx. When selecting it, first confirm the delivered solids content, solvent system, and curing method, then evaluate coating film performance. Merely seeing the words "hydrophilic super-hard stain-resistant nano-coating" is not enough to decide whether it can be used on an existing production line.
This article focuses on procurement and sampling for building anti-graffiti, precious metal anti-corrosion, rail transit, semiconductor insulating layers, electronic circuits, and plastic packaging gas/water barrier applications: products all called perhydropolysilazane differ in how they are charged—a 20% diluted solution and a higher-solids system are handled differently; some scenarios rely on room-temperature moisture curing, while others require high-temperature or ammonia curing to achieve higher hardness. Before requesting a quote, clearly state the equipment, substrate, and film-thickness conditions; this reduces the risk of receiving samples that cannot be applied.
Inorganic (perhydro) polysilazane, organic polysilazane, and silicone resin are different product categories. Organic polysilazanes often carry organic substituents; silicone resins often serve as film-forming or bonding components; inorganic perhydropolysilazane such as IOTA PHPS is delivered as a diluted solution, cures via hydrolysis of Si-N bonds, and forms an inorganic coating composed of SiOx after curing. Actual formulations still depend on chemical structure and reactive groups; products cannot be directly interchanged based on name alone.
This coating product uses perhydropolysilazane IOTA PHPS as the main component, is stored diluted in solvent, has a solids content of 20%, and the solvent is n-butyl ether. Before sampling, confirm the delivered solids content, solvent type, dilution ratio, and target application viscosity.
| Delivery Form | Confirm Before Sampling | Conditions Easily Overlooked When Switching Materials |
|---|---|---|
| 20% diluted solution (n-butyl ether) | Solids content, solvent type, dilution ratio, application viscosity | Solvent compatibility, volatilization and exhaust conditions |
| High-solids/concentrated system | Dilution solvent, mixing sequence, target solids content | Storage stability, moisture sensitivity |
| Formulated coating system | Companion additives, substrate pretreatment, curing method | Mixing sequence, curing program and film-thickness limit |
This table is intended for organizing sampling documents and cannot serve as a formulation for equivalent substitution among systems of different solids content. When comparing price and addition level, normalize to a comparable active-ingredient basis and check the test methods in each document.
IOTA PHPS appears as a colorless transparent liquid with 20% solids content; density is 1.16–1.31 g/ml as 100% liquid, 0.82–0.84 g/ml as 20% liquid, and 1.6–2.0 g/ml after curing. These data can be used to screen sampling directions but cannot directly serve as acceptance results for a customer's finished coating.
Application names only indicate the applicable direction, including building anti-graffiti, precious metal anti-corrosion, rail transit, semiconductor insulating layers, electronic circuits, and plastic packaging gas/water barrier. For an actual coating, the compatibility of the resin with the substrate, additives, and pretreatment must also be checked. If hardness and adhesion are required, pencil hardness (9H Zhonghua, 6H Mitsubishi), hardness (GPa), and adhesion (cross-cut method, grade 0) should be tested together, avoiding material selection based on a single hardness indicator.
Hydrolysis of Si-N bonds and completion of the specified curing program are two different judgment items. Regarding curing conditions, room temperature requires curing for more than 7 days; moisture curing can be performed at 90% humidity and 150°C for 2 h. The specific program should follow the technical data of the selected product.
During sampling, record the actual workpiece temperature, humidity, holding time, and dry film thickness. The oven set temperature only reflects the control condition; whether large or thick parts can meet process requirements should be verified against workpiece temperature records. Do not directly transfer the curing conditions of another model to a new material. Also note that coating thickness is >100 nm, and hardness varies with curing method: ammonia curing gives 3 GPa with elastic modulus 60 GPa; high-temperature curing gives 8–10 GPa with elastic modulus 100–130 GPa.
| Working Conditions to Provide | What Must Be Clearly Stated | Corresponding Verification |
|---|---|---|
| Substrate and pretreatment | Metal, plastic, electronic substrate, or other substrates; cleaning and surface treatment | Adhesion (cross-cut method), appearance |
| Application and film thickness | Coating method; coating thickness (>100 nm) | Leveling, pinholes, cracking |
| Curing equipment | Room temperature 7 days+, or 90% humidity at 150°C for 2 h; whether ammonia curing is used | Curing state and performance reproducibility |
| Service environment | Heat resistance (air, 800°C), alkali resistance, salt water resistance, acid resistance (10% hydrochloric acid is weaker, about one month) | Adhesion after heat aging and required media resistance |
| Functional requirements | Whether it serves functions such as anti-graffiti, anti-corrosion, gas/water barrier, insulation | Verify according to actual film thickness and service environment |
For statements such as heat resistance (air) of 800°C, strong rust/alkali/salt-water resistance, and weaker acid resistance (10% hydrochloric acid) in product introductions, the test object, time, formulation, and judgment criteria must be checked before use. Test results for the base liquid, experimental coating films, and the customer's complete coating system should be recorded separately.
First fix the substrate, pretreatment, and existing application conditions, and list the acceptance items that must be met (hardness, adhesion, transparency, heat resistance, media resistance, etc.).
Request the TDS and SDS of candidate materials from the supplier, and check the delivered solids content (20%), solvent (n-butyl ether), and curing program; if information is insufficient, complete it first—do not presuppose a model.
Sample using the same substrate and comparable film thickness, and keep records of formulation, batch, dilution, and curing; note that coating thickness is >100 nm, and record the curing method (room temperature, moisture, or ammonia).
Check initial appearance and adhesion, then arrange heat resistance, alkali resistance, salt water resistance, acid resistance, or gas/water barrier testing according to the application. Write the test conditions and pass thresholds into the sampling confirmation sheet.
Is IOTA PHPS a pure substance or a diluted solution?
This coating product uses perhydropolysilazane IOTA PHPS as the main component, is stored diluted in solvent, has a solids content of 20%, and the solvent is n-butyl ether.
How long does curing take?
Room temperature requires curing for more than 7 days; moisture curing can be completed at 90% humidity and 150°C for 2 h. The specific procedure should follow the product technical data.
What is the hardness exactly?
Hardness varies with curing method: ammonia curing gives 3 GPa with elastic modulus 60 GPa; high-temperature curing gives 8–10 GPa with elastic modulus 100–130 GPa. Pencil hardness is 9H (Zhonghua) and 6H (Mitsubishi), and should be checked against the specific curing conditions and test methods.
How is the acid resistance?
The data show strong rust, alkali, and salt-water resistance; acid resistance (10% hydrochloric acid) is weaker, about one month. Before use, verify according to the actual media concentration and contact time.
How high is the heat resistance?
Heat resistance (air) is 800°C; the test object, time, formulation, and judgment criteria should be checked, and the base liquid, coating film, and complete coating system should be recorded separately.
What information should be provided at minimum when requesting a quote?
Provide the substrate, pretreatment, application method, target film thickness, curing equipment (room temperature, moisture, or ammonia), and service conditions, and list acceptance items (hardness, adhesion, transparency, heat resistance, media resistance, etc.). This information is more helpful for screening samples than asking only for a hardness number.
IOTA PHPS Inorganic (Perhydro) Polysilazane: for preliminary verification of the 20% diluted solution form, n-butyl ether solvent system, and Si-N hydrolysis curing direction. The specific formulation depends on the substrate, application method, film thickness, and curing conditions.
