One cannot simply assume that IOTA-36, as a phenyltributylketoxime-based silane, is suitable for all single-component neutral silicone sealant systems. One must first confirm the type of base sealant, filler system, catalyst dosage, crosslinking agent ratio, and construction environment before determining whether the problem lies in insufficient crosslinking density, too short surface drying time, or poor compatibility with the base sealant and fillers. IOTA-36 can be considered as a candidate for ketoxime-based crosslinking agents, but it must be confirmed through small-scale tests, control of by-products, and actual working conditions.


Why do neutral silicone sealants often have problems such as excessive surface drying, insufficient crack resistance, or failing to meet heat resistance standards?


During storage, moisture absorption leads to the premature hydrolysis of the ketoxime groups, resulting in a decrease in effective components, weakened crosslinking activity.


Improper control of moisture in the system causes the crosslinking agent to hydrolyze prematurely, reducing the effective concentration and releasing butyl ketoxime, which affects the reaction balance.


Inappropriate catalyst type or dosage leads to insufficient crosslinking reaction conversion rate, deviation in surface drying time and deep curing time from expectations.


The hydroxyl content or molecular weight of the base sealant does not match the crosslinking agent, resulting in either too high or too low crosslinking density, affecting elongation and modulus.


The surface treatment differences of the filler system (such as silica, calcium carbonate) affect the dispersion of the crosslinking agent and the uniformity of the reaction.


Not using other crosslinking agents in combination or with improper ratio leads to too short surface drying time, decreased crack resistance, or insufficient heat resistance.


The mismatch of construction environment temperature and humidity leads to deviations in surface drying time and crack resistance from the target.


Insufficient purity or presence of impurities interferes with the crosslinking reaction, affecting the strength, elongation, and heat resistance of the final silicone rubber.


The content (≥90%) is not optimized for specific systems, and either excess or deficiency affects crosslinking efficiency, storage stability, and the extrudability of the sealant.


Although phenyltributylketoxime-based silane can extend surface drying time and improve crack resistance, if the base sealant formula or filler system does not match, cracking or bond failure may still occur.


What are the public parameters of IOTA-36?


Parameter IOTA-36
Appearance Transparent to pale yellow, with ketoxime (butyl ketoxime) odor liquid
Boiling point 63℃/760mmHg
Density (25℃) 0.995±0.02 g/ml
Content (%) ≥90
Refractive index (25℃) 1.503±0.02
The above data is from Aytota's current public product information. Formal purchase and batch acceptance should be based on the valid TDS, specification documents, and delivery batch COA confirmed by both parties.


IOTA-36 is suitable for which application directions?


Application direction Candidate direction Still needs verification
Single-component neutral curing silicone sealant As a crosslinking agent, produce high elongation and low modulus sealant Base sealant type, dosage, catalyst matching
Improve crack resistance Improve sealant crack resistance Chopping test, aging resistance, adhesion
Improve heat resistance Improve sealant heat resistance Temperature aging, thermal cycling verification
Extend surface drying time Extend surface drying time without damaging crack resistance Shrinkage time, deep curing time, construction window
High elongation low modulus system Provide high elongation and low modulus Hardness, elongation, modulus, elastic recovery
Electronic potting sealant Improve crosslinking density and mechanical strength Electrical performance, aging resistance, deep curing
What are the key differences in the selection of IOTA-36 compared to similar crosslinking agents?


Comparison direction IOTA-36 (phenyltributylketoxime) IOTA-32 (methyl mixed ketoxime) IOTA-91 (ethylene mixed ketoxime) Selection boundary
Crosslinking mechanism Contact water crosslinking, release butyl ketoxime Contact water crosslinking, release butyl ketoxime Contact water crosslinking, release butyl ketoxime Depends on substrate and environmental protection requirements
Drying speed Ability to extend drying time Relatively fast Relatively fast, can shorten the film formation time when combined with MOS/VOS Needs to be verified based on the construction window
Modulus and elongation rate Suitable for high elongation and low modulus systems Generally Higher crosslinking density Needs to be selected based on the product requirements
Crack resistance Improves tear resistance and prolongs drying time without damaging crack resistance Generally Improves crack resistance Needs to be selected based on the product requirements
Heat resistance Improves heat resistance Generally Generally Needs to be verified based on the usage temperature
Corrosion of substrate Neutral, no corrosion Neutral, no corrosion Neutral, no corrosion Thiourea type is suitable for metal substrates
Odor of by-products Dinitroketone oxime odor Dinitroketone oxime odor Dinitroketone oxime odor Needs to be selected based on the construction environment requirements
Stability of storage Needs to be sealed and protected from moisture Needs to be sealed and protected from moisture Needs to be sealed and protected from moisture All need to be stored in a moisture-proof environment
Applicable systems High elongation and low modulus neutral sealant Room temperature curing silicone rubber, neutral glass adhesive One-component neutral silicone sealant Needs to be selected based on the base adhesive and filler
Why is it still necessary to conduct a complete test for compatibility with the base adhesive and fillers?


According to the public information of Aijota, IOTA-36 is used as a crosslinking agent in one-component neutral curing silicone sealant to produce a sealant with high elongation and low modulus, improving tear resistance and heat resistance, and can prolong the drying time without damaging the crack resistance. However, when used in actual systems, there may still be:


Differences in the hydroxyl content and molecular weight of the base adhesive.


Types and surface treatments of fillers.


Types and dosages of catalysts.


Combinations of other crosslinking agents.


Plasticizers, coupling agents, and other additives.


Residual moisture and contaminants.


Construction environmental temperature and humidity.


Storage conditions and packaging sealing.


Thickness of the product and curing time requirements.


Appearance uniformity or short-term layering does not prove stability over long-term storage, thermal cycling, shear, and long-term operation. Before use, a complete formulation and actual materials should be used for verification.


What parameters should be confirmed when using IOTA-36?


Working condition category Information to be confirmed
Base adhesive system Hydroxyl content, molecular weight, type (107 adhesive, methyl silicone rubber, etc.)
Filler type White carbon black, calcium carbonate, silica powder, etc.
Catalyst system Type and dosage of organic tin, titanium acid ester, or other catalysts
Crosslinking agent combination Type and ratio of other crosslinking agents
Crosslinking agent addition amount Determined based on content and hydroxyl content of the base adhesive
Construction conditions Temperature, humidity, construction time
Curing requirements Drying time, deep curing time, hardness, elongation rate, modulus, tear resistance
Storage conditions Sealed, cool and dry, protected from light, moisture-proof
Acceptance indicators Drying time, deep curing, hardness, tensile strength, elongation rate, modulus, tear resistance, heat resistance
What should be mainly verified when using IOTA-36?


Drying time and deep curing time.


Hardness, tensile strength, elongation rate, and modulus of the cured silicone rubber.


Tear resistance and crack resistance of the sealant.


Heat resistance of the sealant.


Compatibility with the base adhesive, fillers, and catalysts.


Effect of crosslinking agent combination.


Crosslinking activity and stability after storage.


Water resistance and aging resistance after curing.


Release of dinitroketone oxime and odor control.


Adhesion to the substrate (glass, metal, plastic, etc.).


Batch consistency and repeatability.


How to design the test before using IOTA-36?


Establish a current crosslinking agent benchmark, record the model, batch, and addition amount, and record the failure performance.


Unify test conditions: base adhesive, filler, catalyst, combination ratio, addition amount, construction environment.


Set candidate samples: current crosslinking agent, IOTA-36, different addition amounts and combination ratio gradients.


Complete the full process testing: mixing → construction → surface drying → deep curing → performance testing.


Evaluate the actual results: surface drying time, deep curing, hardness, strength, elongation rate, modulus, tear resistance, heat resistance.


Test items Uniform requirements
Sample state New glue against new glue
Base glue and fillers Keep consistent
Catalyst type and dosage Keep consistent
Recombinant crosslinking agent ratio Set gradient according to experimental design
Addition amount Set gradient according to application scenario
Construction environment Same temperature, humidity
Measurement method Table drying time, deep curing, hardness, strength, elongation rate, modulus, tear resistance, heat resistance are consistent
Which situations are not suitable for directly using IOTA-36?


The hydroxyl content of the base glue is not confirmed, resulting in insufficient or excessive crosslinking density.


The surface of the filler is not treated, affecting the dispersion of the crosslinking agent and the uniformity of the reaction.


The type or dosage of the catalyst is not optimized, resulting in non-compliant curing speed.


Not using other crosslinking agents in combination or with improper compounding ratio, resulting in too short surface drying time or decreased anti-tear performance.


Requires specific food contact, medical or other industry approval, but corresponding materials have not been obtained yet.


Strict requirements for the odor of by-product dimethyl ketoxime, but no odor assessment has been conducted.


Only have the type of base glue, without fillers, catalysts and construction conditions.


The customer requests to directly mix it into the in-use system, but cannot control the addition amount and mixing ratio.


What selection support can Ayoata provide?


As a "provider of the organic silicon全产业链 solutions"， Ayoata can assist in comparing the applicability of phenyl trimethylketoxime-based silane in different base glue systems， filler types and construction conditions for IOTA-36.


For single-component neutral silicone sealants projects that need to balance surface drying time， high elongation rate， low modulus， tear resistance and heat resistance， the following information should be provided before selection：


Base glue type and hydroxyl content.


Filler type and addition amount.


Catalyst type and dosage.


Other crosslinking agent types and compounding ratios.


Target surface drying time and deep curing time.


Target hardness， tensile strength， elongation rate， modulus and tear resistance.


Construction environment temperature and humidity.


Failure manifestations and acceptance methods.


After receiving complete materials， it can be determined whether to prioritize testing IOTA-36 or continue using the corresponding methyl ketoxime or other crosslinking agent routes.


Common misunderstandings


The shorter the surface drying time， the better the crosslinking agent
The surface drying time needs to be balanced with the construction window， deep curing requirements and storage stability. Too fast may lead to construction difficulties or surface crust formation.


The higher the addition amount， the better the crosslinking effect
Excessive addition may result in excessive crosslinking density， brittle products or sticky surfaces， and the optimal amount needs to be determined through small-scale tests.


The higher the content， the faster the curing speed
The content needs to be matched with the hydroxyl content of the base glue and the catalyst system， too high or too low will affect the crosslinking efficiency and storage stability.


Compatibility with the base glue means it can be directly added to the in-use system
It is still necessary to confirm the filler， catalyst， compounding ratio， construction conditions and long-term stability.


The same performance at 25℃ can be replaced in equal amounts
Different chemical structures of crosslinking agents may have different hydrolysis rates， crosslinking efficiency and compatibility.


Ketoxime-based crosslinking agents have no odor problem
IOTA-36 will crosslink with water to produce dimethyl ketoxime， and the construction environment and product odor requirements need to be evaluated.


IOTA-36 can be used alone and does not require other crosslinking agents for compounding
Public materials indicate that it can be used in high elongation and low modulus systems and can extend surface drying time， but compounding with other crosslinking agents may be more conducive to balancing crosslinking density and tear resistance.


Recommended selection steps


Confirm the base glue type and hydroxyl content.


Confirm the filler type and addition amount.


Confirm the catalyst type and dosage.


Confirm the types and compounding ratios of other crosslinking agents.


Based on the application scenarios, IOTA-36 or other crosslinking agents are initially selected.


Different addition amounts and compounding ratios are set up to conduct small-scale tests.


The drying time, deep curing time, hardness, elongation rate, modulus and tear resistance are tested.


The compatibility with the base adhesive, fillers and catalysts is verified.


Stability in storage and aging resistance are tested.


The release of by-product dimethyl ketoxime and odor control are evaluated.


After completing multiple batch verifications, the final usage plan will be determined.