Adhesives and sealants are essential components in modern manufacturing, construction, automotive assembly, and industrial production. From bonding structural components to protecting joints from moisture and contaminants, these materials play a critical role in ensuring durability and performance across many
applications.
While adhesives and sealants serve different functions, both rely on carefully engineered formulations to deliver reliable results. Achieving the right balance of viscosity, stability, cure speed, adhesion, and durability requires more than selecting the right polymer base. Formulators must consider how pigments, fillers, catalysts, and specialty additives interact to influence overall system performance.
Understanding these formulation factors is key to designing adhesive and sealant systems that perform consistently during application, curing, and long-term service life.
Adhesives and sealants are often used together in many industries, but they serve distinct purposes.
Adhesives are materials designed to bond two substrates together, creating a structural or semi-structural connection. They are commonly used in applications such as automotive assembly, electronics manufacturing, construction, and packaging. Adhesives distribute stress across bonded surfaces, enabling lightweight designs and reducing the need for mechanical fasteners.
Sealants, on the other hand, are designed to fill gaps, joints, or seams to prevent the passage of air, water, dust, or chemicals. Sealants must maintain flexibility over time to accommodate movement between surfaces while maintaining a durable seal. They are widely used in building construction, automotive systems, glazing, and industrial equipment.
Although their functions differ, adhesive and sealant formulations often face similar technical challenges. Both systems require controlled rheology, stable dispersion of fillers and pigments, resistance to moisture, good adhesion, and reliable curing behavior.
Developing high-performance adhesives and sealants involves balancing multiple formulation variables simultaneously. Several factors play a major role in determining application performance and long-term durability.
To address these formulation challenges, adhesive and sealant systems rely on a range of specialty additives. These additives help formulators fine-tune properties such as:
By optimizing these parameters, additives support consistent manufacturing processes and reliable performance across a variety of applications.
Borchers offers additive technologies designed to help formulators address these challenges when developing adhesive and sealant systems.
Adhesives must flow smoothly during application while maintaining enough structure to remain in place once applied. If viscosity is too low, the material may sag or slump before curing. If viscosity is too high, application can become difficult
and inconsistent.
Rheology control is therefore critical for ensuring adhesives exhibit shear-thinning behavior, meaning they flow easily during application but recover viscosity afterward to prevent movement or sagging.
Rheology modifiers help control the flow behavior of adhesives and sealants during application and curing. These additives can build viscosity while allowing the material to flow during mixing or application.
Borchi Gel A LA is a non-associative ready to use thickener designed for waterborne systems. It increases viscosity in the low-shear range and helps improve flow, leveling , and storage stability in coating systems.
Borchi Gel A LA can improve viscosity and storage stability. Performance results were observed compared to a control in an adhesive formulation for automotive interior applications.
Many adhesive and sealant formulations incorporate significant levels of inorganic fillers and pigments such as titanium dioxide (TiO2), calcium carbonate, or black pigments. These materials help adjust mechanical properties, opacity, cost efficiency, and color.
However, achieving stable dispersion of these materials can be challenging. Poor dispersion can lead to agglomeration, viscosity, and instability.
Dispersing additives help stabilize pigments and inorganic fillers within adhesive and sealant formulations. Proper dispersion improves uniformity and supports stable viscosity.
In a TiO2 dispersion with 70% pigment loading, our Borchi Gen 0650 low molecular weight dispersant provided optimal viscosity at various shear rates, stability, and color when compared to a commercially available TiO2 dispersion.
Borchi® Gen 1252 is another high molecular weight wetting and dispersing agent designed for TiO2, iron oxide, and other inorganic pigments. It enables high pigment loadings while maintaining free-flowing viscosities and stable dispersions in coating and adhesive systems.
This type of technology supports consistent formulation behavior and helps maintain performance when high levels of pigments or fillers are required.
Moisture can significantly impact certain adhesive systems, particularly in polyurethane-based formulations such as 2K PU, moisture-curing PU, and STP systems. Water introduced through solvents[DH1] , pigments, fillers, resins, or air humidity can trigger unwanted reactions, leading to premature curing, gas formation, or reduced shelf stability.
Managing moisture content is essential to maintaining predictable curing behavior and preventing defects in the final adhesive or sealant.
Moisture scavengers react chemically with water to remove it from the system before it interferes with the curing reaction.
Additive TI™ is a monofunctional isocyanate moisture scavenger designed for polyurethane-based systems, where it reacts with water to form an inert amide. This helps prevent moisture-related defects and improves storage stability.
Additive OF is also effective as a moisture scavenger, particularly in moisture-curing polyurethane and STP adhesive and sealant systems, where controlling trace moisture is critical for consistent performance and processing.
By eliminating trace moisture introduced through solvents, fillers, or pigments, moisture scavengers help maintain predictable processing and curing behavior.
Catalysts play a central role in controlling curing reactions, particularly in polyurethane and other reactive systems. Cure speed must be carefully balanced with working time, often referred to as pot life.
A formulation that cures too quickly may limit application time, while a formulation that cures too slowly may delay production processes or reduce productivity. Modern formulations also increasingly prioritize catalyst technologies that meet evolving regulatory and sustainability expectations.
Borchi® Kat 2115 is a catalyst based on bismuth and zinc designed to accelerate the reaction between polyol and isocyanate component of polyurethane systems. It provides a balance between drying time, pot life, and hardness development while offering a tin-free alternative to traditional catalyst technologies.
Catalysts such as these help formulators achieve efficient curing without sacrificing application flexibility or long-term durability.
The performance of adhesives and sealants depends on the careful interaction of many formulation components. Achieving the right balance of viscosity stability, dispersion quality, and cure behavior requires a coordinated approach to additive selection.
Technologies such as dispersants, rheology modifiers, moisture scavengers, and catalysts provide formulators with tools to address common challenges while optimizing performance for specific applications.
By supporting these key aspects of formulation design, Borchers additive technologies help enable adhesives and sealants that perform reliably across demanding industrial environments.
Looking to Optimize Your Adhesive or Sealant Formulation?
Borchers provides additive technologies designed to support viscosity control, pigment dispersion, moisture management, and curing performance in adhesive and sealant systems.
Explore our adhesives and sealants additive portfolio or contact a Borchers technical expert to discuss your formulation needs.
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Adhesives and sealants are essential components in modern manufacturing, construction, automotive assembly, and industrial production. From bonding structural components to protecting joints from moisture and contaminants, these materials play a critical role in ensuring durability and performance across manyapplications. While
