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Sealants

Catalysts for Sealants

Sealants are widely used in construction, automotive, electronics, and industrial applications due to their outstanding flexibility, weatherability, and resistance to temperature extremes. Dorf Ketals Tyzor® catalysts provide high-performance curing, crosslinking, and adhesion enhancement in neutral-cure silicone formulations, particularly those based on Room-Temperature Vulcanizing (RTV) technologies. 

Tyzor® titanates function as multifunctional additives in RTV silicone sealants. Their primary roles include acting as curing catalysts, crosslinkers, water scavengers, and adhesion promoters. In neutral-cure systems—especially alkoxy-based formulations—they serve as environmentally friendly alternatives to traditional organotin compounds, which are increasingly restricted due to toxicity concerns. Titanates provide comparable performance with lower ecological and health risks. 

A typical neutral-cure RTV silicone sealant includes hydroxyl-terminated polydimethylsiloxane (OH-PDMS), alkoxy-functional silanes (such as methyltrimethoxysilane, or MTMS), and a titanate catalyst. When exposed to atmospheric moisture, the titanate accelerates the crosslinking of silanol groups with alkoxy silanes, resulting in a durable, elastic silicone network. Tyzor® catalysts ensure consistent curing even under variable humidity and temperature conditions. 

Tyzor® Solutions​

Tin-Free Curing for RTV Silicones
Tyzor® titanates replace organotin in neutral-cure RTV sealants, ensuring safe, efficient crosslinking with strong cure performance.
Tin-Free Curing for RTV Silicones
Tyzor® titanates replace organotin in neutral-cure RTV sealants, ensuring safe, efficient crosslinking with strong cure performance.
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Enhanced Adhesion to Substrates
Tyzor® AA-75 boosts adhesion to glass, aluminum, ceramics, and plastics, improving durability and reducing delamination.
Enhanced Adhesion to Substrates
Tyzor® AA-75 boosts adhesion to glass, aluminum, ceramics, and plastics, improving durability and reducing delamination.
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Low-Odor, Low-Color Systems
Tyzor® catalysts reduce odor and discoloration, ideal for applications requiring clean appearance and indoor compatibility.
Low-Odor, Low-Color Systems
Tyzor® catalysts reduce odor and discoloration, ideal for applications requiring clean appearance and indoor compatibility.
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Stable Moisture Cure Across Conditions
Tyzor® TOT maintains reliable curing under variable humidity, supporting on-site and industrial sealant applications.
Stable Moisture Cure Across Conditions
Tyzor® TOT maintains reliable curing under variable humidity, supporting on-site and industrial sealant applications.
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Better Filler Compatibility and Shelf Life
Tyzor® LA improves compatibility with fillers and extends shelf stability without affecting performance.
Better Filler Compatibility and Shelf Life
Tyzor® LA improves compatibility with fillers and extends shelf stability without affecting performance.
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Oxime-Free, REACH-Compliant Cure
Dorf Ketal titanates enable MEKO-free RTV sealants, meeting regulatory needs while preserving cure quality.
Oxime-Free, REACH-Compliant Cure
Dorf Ketal titanates enable MEKO-free RTV sealants, meeting regulatory needs while preserving cure quality.
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Smart Reactivity for Sealants

Smart Reactivity for Sealants

Compared to tin-based systems, Tyzor® catalysts allow for lower color, reduced odor, and improved shelf life in silicone sealants. This is particularly important for construction sealants where aesthetics and long-term stability are critical. Additionally, titanate catalysts exhibit excellent compatibility with filler systems and other additives, contributing to enhanced mechanical performance and long-lasting adhesion to glass, aluminum, ceramic, and plastics. 

Furthermore, Tyzor® catalysts help address VOC and REACH compliance for global markets by eliminating the need for volatile amines or high-toxicity curing agents. In oxime- or acetoxy-based systems, where cure byproducts like MEKO or acetic acid can raise safety or regulatory concerns, Dorf Ketal is actively developing new titanate-based alternatives to extend the benefits of tin-free chemistry across all RTV technologies. 

Whether used in curtain wall glazing, expansion joints, or industrial gaskets, Tyzor® catalysts enable formulators to achieve a balance of processing flexibility, mechanical strength, and environmental compliance—setting a new standard for performance in the silicone sealant industry. 

Recommended Products

Subcategory/Type
Primary Products
Silicone
Tyzor 722, Tyzor 726, Tyzor 728, Tyzor 9000, Tyzor AA-105, Tyzor AA-75, Tyzor IBAY, Tyzor PITA, Tyzor PITA-SM. ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎
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