One cannot simply conclude that IOTA-23 is a poly methyl triethoxy silane or a solvent-based neutral waterproofing agent, and then directly determine that it is suitable for all building, wood or cultural relic waterproofing systems. One should first confirm the type of substrate, porosity, surface pretreatment method, hydrolysis catalyst system, dilution ratio, coating amount and curing conditions, and then determine whether the problem is due to incomplete film formation during hydrolysis, insufficient penetration depth, or poor compatibility with the substrate and subsequent coatings. IOTA-23 can be considered as a candidate for organic silane waterproofing agents, but it must be confirmed through small-scale tests, adhesion tests and actual working conditions verification.


Why does leakage or cracking still occur after building waterproofing treatment?


Poly methyl triethoxy silane forms a siloxane film through hydrolysis condensation, and is a commonly used waterproofing agent for building, wood protection and cultural relic preservation. However, being colorless and transparent or having a neutral formula does not mean that the waterproofing performance is up to standard. The following factors are equally crucial:


During storage, it absorbs moisture, the ethoxy group hydrolyzes and condenses prematurely, the effective components decrease, and the film-forming activity weakens.


If the moisture control in the system is improper, the silane hydrolyzes prematurely, the effective concentration decreases, and ethanol is released, affecting the reaction equilibrium.


The type or dosage of the hydrolysis catalyst is inappropriate, and the film formation rate does not match the acidic or alkaline conditions, resulting in an uncompact or brittle film layer.


Significant differences in the porosity of the substrate and surface energy lead to insufficient penetration depth, resulting in only surface film formation and still water leakage inside.


Improper coating amount or dilution ratio, resulting in a too thin or too thick film layer, which is insufficient for protection and prone to cracking.


The substrate surface is not cleaned or contains release agents, oils, or old coatings, affecting the chemical bonding of the silane with the surface hydroxyl groups.


The temperature and humidity of the construction environment do not match, causing deviations in the hydrolysis and condensation rates, and a decline in film formation quality.


Insufficient purity or presence of impurities interfere with the hydrolysis and condensation reaction, affecting the final waterproof performance, breathability and weather resistance.


When used for wood or cultural relic preservation, the moisture content, acidity and permeability of the substrate itself have not been evaluated, affecting the treatment effect.


The compatibility with subsequent coatings (such as paints, adhesives) has not been verified, affecting the interlayer adhesion.


What are the public parameters of IOTA-23?


Parameter IOTA-23
Appearance Transparent liquid
Viscosity (25℃) 1-5 mm²/s
Density (25℃) 0.920-1.050 g/cm³
Acid value (%) ≤0.3
Hydrolysis by-products ethanol
Storage period 6 months
The above data are from the current public product information of Aytota. Formal procurement and batch acceptance should be based on the valid TDS, specification documents and delivery batch COA confirmed by both parties.


Which application directions is IOTA-23 suitable for?


Application direction Candidate direction Still needs verification
Building waterproofing Form a siloxane film to prevent water penetration Penetration depth, adhesion, weather resistance, breathability
Wood protection Prevent cracking, prevent weathering Penetration depth, dimensional stability, color difference
Cultural relic preservation Protect against water, dirt, weathering Compatibility, reversibility, aging resistance
Insulation material waterproofing Prevent water penetration treatment Adhesion strength, water resistance, insulation performance retention rate
Pressure-sensitive adhesive sealant Used in combination with methyl room temperature vulcanized silicone rubber Isolation effect, coating uniformity, residue
Defoamer and release agent Further hydrolyzed to Hydrolysis degree, particle size, stability
Replace ethyl silicate Used for siloxane rubber crosslinking Compression strength, elongation rate, crosslink density
What are the differences in selection priorities between IOTA-23 and similar waterproofing agents?


Comparison direction IOTA-23 (poly methyl triethoxy silane) ethyl silicate ethyl triethoxy silane (IOTA 150) Selection boundary
Molecular structure Prepolymer of poly methyl triethoxy silane ethoxy silane monomer ethyl triethoxy silane monomer Select based on hydrolysis speed and film formation characteristics
Film-forming properties: Neutral waterproofing agent, forms a siloxane film; forms an inorganic SiO₂ network; forms a methyl siloxane network; selection depends on waterproofing and breathability requirements.
Hydrolysis rate: Medium, pre-polymer hydrolysis is more controllable; faster, requires control of catalyst and water volume; faster, requires control of catalyst and water volume; selection depends on coating process and shelf life.
Film layer flexibility: Methyl groups introduced, good flexibility; relatively rigid, prone to cracking; medium flexibility; selection depends on deformation requirements of the substrate.
Applicable systems: Building, wood protection, cultural relics waterproofing; hard coating, stone reinforcement; resin synthesis, filler treatment; selection depends on substrate and performance requirements.
By-products: Ethanol; Ethanol; Ethanol; all need to control ventilation and environmental protection.
Alternative to tetraethyl orthosilicate: Can be used for cross-linking of silicone rubber, with better performance than TEOS cross-linking; general silicone rubber cross-linking; single functional, requires compounding; need to verify tensile strength and elongation.
Why still need to conduct complete tests for compatibility with the substrate?


Ajoyata's public materials state that IOTA-23 is used for building waterproofing, wood protection, cultural relics protection, waterproof treatment of insulation materials, and as a pressure-sensitive adhesive isolation agent in combination with methyl room-temperature vulcanized silicone rubber, and can further hydrolyze to form defoamers and release agents. However, when used in actual systems, there may still be:


Differences in substrate porosity and surface energy.


Substrate moisture content and acidity or alkalinity.


Types and concentrations of hydrolysis catalysts.


Types and proportions of diluent solvents.


Coating volume, coating frequency and construction method.


Construction environment temperature and humidity.


Curing time and curing conditions.


Compatibility with subsequent coatings or adhesives.


Appearance transparent or short-term non-permeable, cannot prove that the waterproof effect remains stable after long-term use, thermal cycling or freeze-thaw cycles. Before use, verification should be conducted using the complete formula and actual substrate.


What parameters should be confirmed when using IOTA-23?


Parameter category Information to be confirmed
Application direction Building waterproofing, wood protection, cultural relics protection, insulation material waterproofing treatment
Substrate type Concrete, mortar, stone, wood, brick and tile, etc.
Substrate condition Moisture content, porosity, surface cleanliness, acidity and alkalinity
Surface pre-treatment Cleaning method, drying degree, old coating treatment
Hydrolysis catalyst Acid or base type, concentration, pH range
Diluent solvent Solvent type and dilution ratio
Coating process Spray, brush, dip, coating volume and frequency
Curing conditions Temperature, humidity, curing time
Acceptance indicators Waterproofing, breathability, adhesion, weather resistance, color difference
What should be mainly verified when using IOTA-23?


Clarity and homogeneity of the hydrolyzed solution.


Applicability period and gelation time of the hydrolyzed solution.


Waterproof performance of the treated substrate (absorption rate, contact angle).


Air permeability of the treated substrate.


Coating or film layer adhesion.


Weather resistance (UV aging, freeze-thaw cycles, wet heat aging).


Dimensional stability and color difference of wood after treatment.


Compatibility and reversibility of cultural relics treatment.


Layer-to-layer adhesion with subsequent coatings.


Tensile strength and elongation rate when using IOTA-23 as an alternative to tetraethyl orthosilicate for silicone rubber.


Batch consistency and repeatability.


How to design tests before using IOTA-23?


Establish a current waterproofing agent benchmark, record model, batch, dilution conditions and coating parameters.


Uniform test conditions: substrate type, surface pre-treatment, hydrolysis catalyst, dilution ratio, coating method, curing conditions.


Set candidate samples: current waterproofing agent, IOTA-23 at different dilution ratios and coating volumes.


Complete process testing: hydrolysis → dilution → coating → curing → performance testing.


Evaluate actual results: waterproofing, breathability, adhesion, weather resistance.


Test items Uniform requirements
Substrate type and pre-treatment
Hydrolysis catalyst and pH Graduated according to the experimental design
Dilution ratio Graduated according to the experimental design
Coating method and coating amount Keep consistent or set as a gradient
Curing conditions Equal temperature, humidity and curing time
Measurement methods Equal waterproofing, breathability, adhesion and weather resistance
Which situations are not suitable for directly using IOTA-23?


The substrate surface is not cleaned or the moisture content is too high, which affects penetration and film formation.


The hydrolysis catalyst system has not been screened, resulting in a mismatch in film formation rate.


The coating amount or dilution ratio has not been optimized, causing the film layer to be too thin or too thick.


Specific food contact, medical or cultural relic protection industries require approval, but corresponding materials have not been obtained yet.


Strict requirements for breathability, but no breathability verification has been conducted.


Only the substrate type is known, without hydrolysis conditions, coating process and curing parameters.


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


Poor ventilation in the operating environment or insufficient fire protection measures, with the risk of ethanol release safety.


When switching from silicic acid ethyl ester or other waterproof agents, the water consumption for hydrolysis and the catalyst system have not been re-adjusted.


For wood or cultural relic protection, the color difference, dimensional stability and reversibility of the treatment have not been evaluated after processing.


What selection support can Aytota provide?


As a "provider of the organic silicon全产业链 solutions"， Aytota can assist in comparing the applicability of poly methyl triethoxy silane in different substrates， hydrolysis processes and coating conditions for IOTA-23.


For construction， wood or cultural relic protection projects that need to balance waterproofing， breathability and weather resistance， before selection， the following information should be provided：


Substrate type and surface condition.


Substrate moisture content and porosity.


Hydrolysis catalyst type and pH range.


Type of diluent and dilution ratio.


Coating process and coating amount requirements.


Curing temperature， humidity and curing time.


Target waterproofing， breathability and adhesion.


Current waterproofing agent model and dilution conditions.


Failure manifestations and acceptance methods.


After receiving complete materials， it can be determined whether to prioritize testing IOTA-23 or choose the route of silicic acid ethyl ester or other organic silicon waterproof agents.


Common misunderstandings


Neutral waterproof agents do not need to control hydrolysis conditions
Neutral formulations still need to be hydrolyzed under acidic or alkaline conditions to form a film， and the type and dosage of the catalyst directly affect the density and waterproof effect of the film layer.


The higher the coating amount， the better the waterproof effect
Too thick a film layer is prone to cracking， and too thin a film layer is insufficient for protection. It is necessary to determine the optimal coating amount and dilution ratio through small-scale tests.


Compatibility with the substrate is enough to directly apply
It is still necessary to confirm the moisture content， porosity， surface cleanliness and acidity or alkalinity of the substrate， as well as the compatibility of the subsequent coating.


Hydrolysis solution can be freely prepared
The type of hydrolysis catalyst， pH， dilution ratio and aging time directly affect the degree of hydrolysis and film formation quality， and need to be controlled according to the recommended process.


The ethanol by-product can be ignored
Ethanol release may affect operational safety and the construction environment， and ventilation measures need to be configured.


IOTA-23 can be interchanged with silicic acid ethyl ester at will
IOTA-23 is poly methyl triethoxy silane， containing methyl groups， with better flexibility than silicic acid ethyl ester； when used for silicone rubber cross-linking， the tensile strength and elongation performance are different， and the formula and process need to be re-verified when replacing.


No need to verify reversibility for cultural relic protection
Cultural relic protection has strict requirements for the reversibility and compatibility of materials， and a special assessment is required.


Recommended selection steps


Confirm the application direction： building waterproofing， wood protection or cultural relic protection.


Confirm the substrate type， moisture content and porosity.


Confirm the type of hydrolysis catalyst， pH and dilution ratio.


Evaluate the shelf life and gelation time of the hydrolysis solution.


Select IOTA-23 or other waterproof agents based on the application scenario.


Set up different dilution ratios and coating amounts in a gradient for pilot tests.


Test waterproofing, breathability, adhesion and weather resistance.


Verify the inter-layer adhesion with subsequent coatings.


When using for silicone rubber crosslinking, test tensile strength and elongation.


Evaluate the release of ethanol by-products and ventilation requirements.


After completing multiple batch validations, determine the official usage plan.