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TIB KAT 423 is a commercial organotin-based catalyst blend used mainly to accelerate curing (crosslinking) of silicone and silane-terminated polymer systems in industrial sealants and adhesives.
TIB KAT 423 is typically formulated as a dioctyltin oxide–based complex (organotin catalyst) that promotes moisture-triggered polymer curing at room temperature.
TIB KAT 423 makes it a key additive in one-component (1K) moisture-curing systems.
CAS Number: 870-08-6
Molecular Formula: C16H34OSn
Molecular Weight: 361.15
EINECS Number: 212-791-1
Synonyms: Dioctyltin oxide, di-n-octyltin oxide, di-n-octyl tin oxide, dioctyl tin oxide, dioctyl tin (IV) oxide, dioctyloxotin, dioctyloxostannane, dioctyl(oxo)tin, dioctyl(oxo)stannane, dioctylstannanone, stannane dioctyloxo-, stannane oxodioctyl-, tin dioctyloxo-, tin dioctyl oxide, di-n-octyl-zinn oxyd, DOTO, IRGASTAB T 161, U 800, CAS 870-08-6, C16H34OSn, EC 212-791-1, EINECS 212-791-1, BRN 4131181, UNII 643Q9V5VLS, DTXSID6029628, RefChem:134507, NSC-140743, NSC 140743, AI3-61965, MFCD00013839, di-n-octyltinoxide98%;di-n-octyl-zinnoxyd;dioctyloxo-stannan;dioctyl-tioxide;oxodioctyl-stannan;DIOCTYLOXOSTANNANE;DIOCTYLTIN(IV) OXIDE;DIOCTYL TIN OXIDE
TIB KAT 423 is not a single pure compound but a mixture containing organotin species (often derived from dioctyltin oxide) combined with silane-reactive components, designed to catalyze silanol and alkoxysilane condensation reactions.
These reactions form strong Si–O–Si networks that harden the material.
TIB KAT 423 makes it essential for silicone and MS polymer curing chemistry.
TIB KAT 423 is supplied as a liquid catalyst that is added in small amounts to polymer formulations to control curing speed, skin formation time, and final mechanical properties of sealants or coatings.
It is designed to work under ambient humidity without needing external heat.
TIB KAT 423 makes it important in construction and industrial sealing systems.
TIB KAT 423 is best described as a moisture-curing organotin catalyst system used to harden silicone and hybrid polymer materials by accelerating condensation crosslinking reactions.
Its main function is process control rather than becoming part of the final material structure.
This makes it a functional industrial curing catalyst.
TIB KAT 423 is part of a broader class of organotin catalysts that function as Lewis acid–type activators, meaning they promote chemical reactions by temporarily accepting electron density from reactive groups such as silanols or alkoxysilanes.
This interaction lowers the activation energy of condensation reactions and speeds up network formation.
TIB KAT 423 makes it effective in controlled polymer curing chemistry.
In silicone and MS polymer systems, its performance is closely linked to moisture diffusion into the bulk material, since curing starts at the surface and progresses inward as water enables hydrolysis and subsequent condensation reactions.
This leads to a gradual development of mechanical strength over time.
TIB KAT 423 makes it important in through-curing behavior.
TIB KAT 423 also influences rheological development during curing, where viscosity increases progressively as the polymer network forms, transitioning the material from a workable paste into an elastic solid.
This transition must be carefully balanced for application performance.
TIB KAT 423 makes it important in processing window control.
Because organotin catalysts are highly active even at low concentrations, TIB KAT 423 is used in very small dosages, where slight changes in concentration can significantly affect skin time, cure speed, and final elasticity of the cured material.
This sensitivity requires precise formulation control.
TIB KAT 423 makes it a powerful but delicate formulation tool.
TIB KAT 423 is often combined with plasticizers, fillers, and adhesion promoters, where it must remain compatible without causing premature curing or instability during storage.
Compatibility is a key factor in shelf-life stability of sealant products.
TIB KAT 423 makes it important in formulation compatibility engineering.
TIB KAT 423 is also valued because it enables ambient-temperature curing systems that do not require external energy input, making it suitable for field applications such as construction joints, glazing, and on-site repairs.
This reduces energy consumption and simplifies application procedures.
TIB KAT 423 makes it useful in practical construction workflows.
TIB KAT 423 is typically optimized so that its catalytic activity remains latent during storage but becomes strongly active only when exposed to ambient moisture in the final application environment.
This delayed activation is crucial for preventing premature curing inside sealed cartridges or containers.
This makes it important in shelf-stable sealant technology.
In MS polymer and silicone systems, the catalyst supports a stepwise network formation process where small oligomeric siloxane structures form first, followed by progressive crosslinking into a continuous elastomeric matrix.
This staged mechanism helps control shrinkage and internal stress development.
TIB KAT 423 makes it important in mechanical performance optimization.
TIB KAT 423 is strongly influenced by formulation additives such as fillers (calcium carbonate, silica), plasticizers, and adhesion promoters, which can either accelerate or partially hinder moisture diffusion and reaction kinetics.
TIB KAT 423 means the final curing behavior is highly formulation-dependent.
This makes it essential in system-level formulation design.
In practical use, it helps maintain a balance between open time (workability before curing begins) and tack-free time (surface curing), which is critical for application quality in construction and assembly operations.
If this balance is not optimized, application defects can occur.
TIB KAT 423 makes it important in user-facing product performance.
Because organotin catalysts are highly active, TIB KAT 423 is often used in systems where very small dosing accuracy is required, as overdosing can lead to excessively fast curing and reduced working time.
Underdosing, on the other hand, can result in incomplete curing or weak mechanical properties.
TIB KAT 423 makes precise formulation control essential.
In modern formulations, there is also a trend toward reducing organotin content due to regulatory and environmental concerns, leading to partial replacement or hybrid catalyst systems in some applications.
However, organotin catalysts like TIB KAT 423 are still widely used due to their high efficiency.
TIB KAT 423 makes it relevant in evolving regulatory chemistry.
Melting point: 245–248 °C (decomposition)
Boiling point: 230 °C (1013 hPa)
bulk density: 700 kg/m3
Density: 1.3 g/cm3
vapor pressure: <0.01 hPa (20 °C)
Flash point: 70 °C
storage temp.: Store below +30°C
solubility: Toluene (slightly soluble)
form: powder
Specific Gravity: 1.30
color: white
Water Solubility: insoluble
Exposure limits:
ACGIH: TWA 0.1 mg/m3; STEL 0.2 mg/m3 (Skin)
NIOSH: IDLH 25 mg/m3; TWA 0.1 mg/m3
InChI: 1S/2C8H17.O.Sn/c21-3-5-7-8-6-4-2;;/h21,3-8H2,2H3;;
InChIKey: LQRUPWUPINJLMU-UHFFFAOYSA-N
SMILES: Sn(CCCCCCCC)CCCCCCCC
LogP: 6 at 20 °C
TIB KAT 423 is a catalyst blend based on dioctyltin oxide formulation.
TIB KAT 423 is suitable for curing of silicones, silane-terminated polymer systems, alkoxy-based RTV silicones and one-component MS/STP systems.
TIB KAT 423 has a shelf life of 12 months.
TIB KAT 423 is widely used because it provides fast and controlled curing behavior in alkoxy-functional silicone and MS (silyl-terminated) polymer systems, where precise curing speed is critical for application performance.
It helps balance open time (workability) and curing speed (hardening).
TIB KAT 423 makes it important in sealant formulation design.
Its catalytic activity is based on accelerating hydrolysis and condensation reactions of alkoxysilane groups, which leads to the formation of siloxane (Si–O–Si) networks that give elasticity and mechanical strength to the final material.
This reaction is the core mechanism behind silicone curing.
TIB KAT 423 makes it essential in silicone chemistry.
Because it is moisture-activated, TIB KAT 423 enables ambient curing systems that harden simply by exposure to atmospheric humidity, eliminating the need for heat curing in most applications.
This is especially useful for construction and field-applied sealants.
TIB KAT 423 makes it highly practical in real-world applications.
TIB KAT 423 is also valued for its compatibility with filled, pigmented, and hybrid polymer systems, allowing formulators to adjust viscosity, color, and mechanical properties without losing curing efficiency.
This flexibility supports a wide range of product designs.
TIB KAT 423 makes it useful in formulation engineering.
In industrial practice, TIB KAT 423 helps achieve fast skin formation and uniform through-curing, reducing defects such as incomplete curing, tackiness, or uneven hardening in thick sections.
This improves product reliability and performance consistency.
TIB KAT 423 makes it important in quality-controlled manufacturing.
Because it contains organotin chemistry, its performance depends strongly on moisture exposure, temperature, and formulation balance, meaning small changes in formulation can significantly affect curing speed and final material properties.
This requires careful optimization in industrial use.
TIB KAT 423 makes it a sensitive but powerful catalyst system.
TIB KAT 423 is part of a reaction-controlled curing system where the catalyst does not directly become part of the final polymer network but instead temporarily activates silane hydrolysis and condensation pathways during processing.
This means its role is catalytic rather than structural in the cured material.
TIB KAT 423 makes it a process-enabling additive in polymer chemistry.
TIB KAT 423s activity depends strongly on water diffusion kinetics through the polymer matrix, which means curing speed can vary significantly between surface regions and bulk material depending on humidity and film thickness.
Thicker sections typically cure more slowly due to limited moisture penetration.
TIB KAT 423 makes it important in diffusion-controlled reaction systems.
The catalyst supports progressive network densification, where early-stage gel formation is followed by continued crosslinking over time until the material reaches its final mechanical equilibrium state.
TIB KAT 423 gradual evolution improves mechanical stability and reduces internal stress buildup.
TIB KAT 423 makes it important in elastomer performance development.
Because it is highly active at low concentrations, TIB KAT 423 is often evaluated using rheological and cure-time measurements such as tack-free time, skin formation time, and Shore hardness development curves.
These parameters are used to optimize formulation performance.
TIB KAT 423 makes it essential in quality control and product design.
Its performance can be influenced by moisture scavengers, fillers, and stabilizers present in the formulation, which may either delay or accelerate hydrolysis reactions depending on their chemical nature and surface properties.
This leads to complex formulation interactions that must be carefully balanced.
TIB KAT 423 makes it important in multi-component system design.
In industrial production, it is typically added during the final compounding stage under controlled conditions to ensure uniform distribution and to avoid premature reaction during mixing or storage.
Improper addition timing can lead to batch instability or reduced shelf life.
TIB KAT 423 makes it critical in manufacturing process control.
Uses:
Dioctyltin oxide is used as a stabilizer and as a widely applicable catalyst, especially for esterification reactions, transesterification reactions and condensation reactions.
TIB KAT 423 is slightly less reactive than dibutyltin oxide, but is not subject to as many regulatory restrictions, which is why it is increasingly used.
Dioctyloxotin can also be used in various chemical synthesis such as in preparation of trinuclear seven-coordinated tin complexes, having possible antioxidant, and anti-inflammatory activity.
TIB KAT 423 is used in one-component (1K) moisture-curing sealants, where it accelerates the curing of silane-terminated polymers (MS polymers) to form elastic, durable materials.
These are widely used in construction joints and sealing applications.
TIB KAT 423 makes it essential in building sealant technology.
In silicone adhesive systems, it is used to catalyze the condensation of alkoxysilane-functional silicones, enabling fast curing at room temperature under ambient humidity conditions.
This produces flexible and weather-resistant adhesive bonds.
TIB KAT 423 makes it important in silicone adhesive manufacturing.
In construction materials, it is used in facade sealants, window glazing compounds, and expansion joint sealants, where long-term elasticity and weather resistance are required.
It helps ensure structural durability and waterproofing.
TIB KAT 423 makes it valuable in civil engineering applications.
In automotive applications, it is used in gaskets, elastic bonding agents, and sealing compounds, where vibration resistance and temperature stability are important.
It improves durability under mechanical stress.
TIB KAT 423 makes it useful in automotive sealing systems.
In industrial coatings and hybrid polymers, it is used to control curing speed and improve mechanical performance of silane-based hybrid materials, including flooring adhesives and protective coatings.
TIB KAT 423 enhances both processing and final material properties.
TIB KAT 423 makes it important in industrial polymer systems.
TIB KAT 423 is used in moisture-curing silicone and MS polymer sealants, where it accelerates condensation reactions that form flexible, durable elastomeric materials.
These sealants are widely used in construction and industrial assembly.
TIB KAT 423 makes it essential in sealing technology.
In construction applications, it is used in window glazing, facade sealing, expansion joints, and waterproofing systems, where long-term elasticity and weather resistance are required.
It helps maintain structural integrity under movement and environmental stress.
TIB KAT 423 makes it important in civil engineering materials.
In adhesives, it is used in elastic bonding systems for metals, glass, plastics, and composites, where flexible yet strong adhesion is needed.
It supports vibration resistance and thermal movement tolerance.
TIB KAT 423 makes it useful in structural bonding systems.
In automotive manufacturing, it is used in gaskets, trim bonding, and vibration-damping sealants, where durability and resistance to heat and mechanical stress are important.
TIB KAT 423 improves long-term performance under dynamic conditions.
This makes it valuable in vehicle assembly applications.
In industrial coatings and hybrid polymer systems, it is used to control curing speed and improve crosslink density in silane-terminated formulations, enhancing final mechanical and chemical resistance.
This improves product durability and surface performance.
TIB KAT 423 makes it important in advanced polymer engineering.
TIB KAT 423 is used in 1K moisture-curing silicone and MS polymer sealants, where it ensures fast and reliable curing after exposure to air humidity.
These materials are widely used for sealing joints and gaps in construction.
TIB KAT 423 makes it essential in construction sealant systems.
In building and infrastructure applications, it is used in facade sealing, glazing compounds, expansion joints, and waterproofing materials, where long-term flexibility and weather resistance are required.
It helps maintain sealing integrity under thermal and mechanical stress.
TIB KAT 423 makes it important in civil engineering applications.
In industrial adhesives, it is used in elastic bonding systems for dissimilar materials such as glass, metal, wood, and plastics, where flexibility and adhesion strength must coexist.
TIB KAT 423 supports vibration resistance and thermal expansion tolerance.
TIB KAT 423 makes it useful in structural bonding applications.
TIB KAT 423 is used in sealants, gaskets, vibration damping materials, and trim bonding systems, where durability and environmental resistance are critical.
It helps maintain performance under heat, vibration, and moisture exposure.
TIB KAT 423 makes it valuable in vehicle assembly technologies.
In hybrid polymer systems, it is used to control curing speed and improve crosslink density in silane-modified formulations, enhancing final elasticity, tensile strength, and chemical resistance.
TIB KAT 423 improves overall product durability and performance stability.
This makes it important in advanced polymer engineering.
TIB KAT 423 is used in one-component moisture-curing silicone and MS polymer sealants, where it enables ambient curing through accelerated silane condensation reactions.
These systems are widely used in construction sealing applications.
This makes it essential in elastomer sealant technology.
In construction and civil engineering, it is used in facade sealing, glazing systems, expansion joints, and waterproofing applications, where long-term elasticity and weather resistance are required.
It ensures structural integrity under environmental stress and movement.
TIB KAT 423 makes it important in building envelope systems.
In industrial adhesives, it is used in flexible bonding systems for metals, plastics, glass, and composite materials, where vibration resistance and thermal movement tolerance are required.
It improves adhesion performance without sacrificing elasticity.
TIB KAT 423 makes it useful in structural adhesive engineering.
In automotive applications, it is used in sealants, gaskets, and vibration-damping compounds, where resistance to heat, moisture, and mechanical stress is essential.
TIB KAT 423 contributes to durability and long-term sealing performance.
TIB KAT 423 makes it valuable in automotive materials engineering.
In hybrid polymer formulations, it is used to control curing kinetics in silane-terminated systems, improving crosslink density and optimizing mechanical properties such as tensile strength and elongation.
This allows tailoring of final material performance for specific applications.
TIB KAT 423 makes it important in advanced polymer formulation science.
Safety Profile:
TIB KAT 423 is considered a moderate hazard industrial chemical due to its organotin content, which can cause irritation and requires controlled handling in workplace environments.
Its risks are mainly related to exposure during formulation and processing.
TIB KAT 423 makes occupational safety measures necessary.
Direct contact may cause skin and eye irritation, especially in concentrated form, and repeated exposure should be avoided.
Protective gloves and eye protection are recommended during handling.
TIB KAT 423 makes personal protective equipment important.
Inhalation of vapors or aerosols may cause respiratory irritation, including coughing or throat discomfort, particularly in poorly ventilated areas.
Proper ventilation reduces exposure risk significantly.
TIB KAT 423 makes engineering controls important in industrial use.
Organotin compounds in general may present toxicity concerns if exposure is excessive or prolonged, so strict industrial hygiene and controlled dosing are required in formulations.
Safe handling procedures are essential in manufacturing environments.
TIB KAT 423 makes regulated use important.
Environmental release should be minimized because organotin substances can be harmful to aquatic organisms and may persist in the environment if not properly treated.
Waste disposal must follow chemical safety regulations.
TIB KAT 423 makes environmental control necessary.
TIB KAT 423 is a highly effective but carefully regulated curing catalyst that must be handled under controlled industrial conditions with proper safety and environmental precautions.
Its performance benefits are significant but require responsible use.
TIB KAT 423 makes it a specialized industrial chemical system.
