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IOTA 9118 is a liquid polysilazane containing Si-N structures with vinyl groups as the main functional group, specially designed for high-temperature coating systems. The product data give low viscosity (10–40 cp), molecular weight 1200–1400, purity above 99%, density 0.98–0.99 g/cm³, cured hardness 6–7H, coating water contact angle 100°–105°, metal adhesion by cross-cut grade 0, visible-light transmittance >95%, linear shrinkage <1%, ceramic yield at 800°C of 50%–60%, ceramic conversion of the cured product at 800°C of 60%–70%, good chemical barrier properties, and a shelf life of one year unopened.
Selection should not rely only on “high-temperature resistant,” “6–7H,” or the contact-angle number. First confirm the substrate type—metal, alloy, glass, paint film, or plastics such as PP, PC, PVC, and PMMA—the application method (wiping, dip coating, spray coating, brush coating), target film thickness, curing method, whether ceramic conversion is required, whether it is a clear coating or used with a main coating, and the project acceptance criteria for adhesion, heat resistance, oxidation resistance, corrosion resistance, easy-clean performance, and non-flammability. This article does not equate these properties with a specific salt-spray duration, fire rating, or outdoor service life. IOTA can provide polysilazane raw materials and corresponding product data; the company does not provide complete formulations or formulation development services.
IOTA 9118 is used in coatings, adhesives, non-combustible composites, polymer matrix composites, glass and abrasive fields, and easy-clean applications requiring low surface tension. Different applications focus on different points: high-temperature coatings on curing and heat resistance, easy-clean on surface tension and contact angle, adhesives on adhesion, composites on wetting and ceramic conversion, and glass and abrasives on transparency and application compatibility. Selection should start with the target defect and application, not just “high temperature resistant.”
| What to confirm | What to specify in an inquiry or sample request |
|---|---|
| Substrate and pretreatment | Metal, alloy, glass, paint film, PP, PC, PVC, PMMA, etc.; surface cleaning, sanding, primer, or other treatment |
| Coating role | Clear coating or used with a main coating; whether used as primer, topcoat, or intermediate layer |
| Application method | Wiping, dip coating, spray coating, brush coating; application viscosity, coating weight, target wet/dry film thickness |
| Curing and ceramic conversion | Curing method, temperature, and time; whether ceramic conversion is required, target temperature, atmosphere, and heating schedule |
| Film thickness and cracking | Target film thickness; the data relate the resin cracking threshold to coatings of 100 µm and above; the actual thickness limit must be confirmed with the system |
| Acceptance criteria | Adhesion, hardness, heat resistance, oxidation resistance, corrosion resistance, easy-clean performance, contact angle, non-flammability, transparency, etc. |
| Sample preparation | Sample size, substrate batch, number of coating passes, whether a main coating is used, sample quantity |
If the customer already has a test specification, obtain the original document first. When criteria are missing, confirm them with the project owner and test laboratory before making samples, so that both sides do not discover different interpretations of “pass” after testing.
The product data separately state: recommended service temperature for clear coatings is <800°C; recommended service temperature when used with a main coating is <1600°C. These two temperature boundaries cannot be mixed. When used alone as a clear coating, understand it as <800°C. Only when used together with a main coating should the <1600°C recommended range be discussed, and even then it must be confirmed with the main coating system, substrate, and actual service conditions.
Application methods include wiping, dip coating, spray coating, and brush coating, and can be used on metals, alloys, glass, paint films, and plastics such as PP, PC, PVC, and PMMA. Different substrates have different surface energies and pretreatment requirements; metal adhesion grade 0 cannot be used to infer adhesion on all substrates. Plastic substrates especially require separate confirmation of adhesion, deformation, and curing-temperature compatibility.
The product features state multiple curing methods and non-flammability after curing. The curing method, temperature, and time should be confirmed together with substrate heat tolerance, film thickness, and equipment. If the target is a high-temperature oxidation-resistant ceramic coating or ceramic conversion is required, evaluate ceramic yield and ceramic conversion under the confirmed heating schedule. The data of 50%–60% ceramic yield at 800°C and 60%–70% ceramic conversion of the cured product at 800°C are values at a specific temperature and cannot be directly extrapolated to other temperatures or arbitrary atmospheres.
“Non-flammable after curing” is a material characteristic description, not the same as having passed a specific fire standard or fire rating. Fire rating, smoke toxicity, and durability requirements for non-combustible composite projects must be verified separately according to the project specification.
Cured hardness 6–7H, coating water contact angle 100°–105°, metal adhesion by cross-cut grade 0, visible-light transmittance >95%, linear shrinkage <1%, and good chemical barrier properties for O2, H2O, and other gases are typical data under the corresponding conditions in the product data. Hardness, contact angle, and adhesion are affected by substrate, film thickness, curing, and ceramic conversion; transparency should also be confirmed separately on the target film thickness and substrate.
The data relate the resin cracking threshold to coatings of 100 µm and above, indicating that cracking risk requires particular attention as film thickness increases. Simply increasing thickness is not a universal solution. For corrosion resistance or oxidation resistance, the “corrosion resistance” and “oxidation resistance” features should be translated into specific media, temperature, time, and evaluation methods; they cannot be directly equated with a specific salt-spray duration.
Obtain the customer’s service conditions and acceptance criteria; confirm whether heat resistance, adhesion, oxidation resistance, corrosion resistance, easy-clean performance, and non-flammability are targets or existing results.
Specify substrate, surface treatment, coating role (clear coating or used with a main coating), application method, target film thickness, curing method, and ceramic conversion schedule.
Check the current IOTA 9118 data, then have the user make representative samples and keep records of formulation, dilution, application, curing, and heating profile.
Arrange tests as agreed; keep sample identity, test conditions, observation photos, and evaluation results in the report. Before expanding use, confirm whether the samples represent actual workpieces.
IOTA/Anhui Iota Silicone Oil Co., Ltd. positions itself as a solution provider across the organosilicon industry chain and can provide polysilazane raw materials and corresponding product data. When communicating, provide the substrate, existing coating system, application equipment, target defects, and curing conditions together to facilitate candidate screening; the company does not provide complete formulations or formulation development services.
That cannot be directly assumed. The data state recommended service temperature <800°C for clear coatings and <1600°C when used with a main coating. The coating role, main coating system, and actual service conditions must be defined before evaluation.
No. Contact angle reflects surface wetting characteristics. Corrosion resistance also depends on film integrity, adhesion, media, and post-test corrosion.
No. Non-flammability is a material characteristic description. Specific fire rating, smoke toxicity, and durability requirements must be verified separately according to the project specification.
That cannot be simply assumed. The data relate the resin cracking threshold to coatings of 100 µm and above. As film thickness increases, cracking risk requires particular attention and should be evaluated together with curing and the coating system.
No direct inference can be made. Plastic substrates have different surface energies and heat tolerance; adhesion, curing-temperature compatibility, and deformation risk should be confirmed separately.
No direct extrapolation. The data correspond to 800°C conditions; other temperatures, atmospheres, and formulations require separate evaluation.
