INDUSTRIAL SEALANTS

Industrial sealants
Industrial sealants provide long-lasting and reliable sealing on applied surfaces. Typically elastomeric in nature, these materials retain flexibility after application and adapt to surface movements. They also demonstrate resistance against UV radiation, temperature fluctuations, and chemical exposure. Thanks to these properties, they are preferred for both indoor and outdoor applications.Sealants are specialized chemical products that act as mechanical barriers and perform essential functions in numerous industrial sectors including construction, automotive, aerospace, marine, and electronics. Their primary purpose is to prevent the formation of gaps between two surfaces and block the passage of liquids, gases, dust, or other harmful substances. Industrial sealing solutions are typically designed to withstand harsh conditions and high-performance requirements. Although sealants generally have limited adhesion, some systems may exhibit hybrid properties and should not be confused with adhesives.

 

Classification by Curing Mechanism

One of the most important technical features of sealants is their curing method, which determines the final hardness, chemical resistance, and flexibility of the product.

• Evaporation Curing (Solvent or Water-Based): Curing occurs at room temperature as the solvent or water evaporates.

• Thermal Curing (Thermoset / Thermoplastic): Requires high heat to cure. Thermosets cannot be reshaped after curing, while thermoplastics can be reheated and reshaped.

• UV / Electron Beam Curing: Energy-efficient and commonly used in the glass, electronics, and medical sectors.

• Anaerobic Curing: Cures in the absence of oxygen and in the presence of metal ions. Often used in bearings, gears, and motor parts.

• Moisture Curing Systems: Utilize environmental moisture to cure, commonly seen in polyurethane and silicone-based systems.

 

Top 5 Most Common Industrial Sealant Types

 

1. Polymer-Based Sealants

• Structure: Includes formulations such as polyurethane, polysulfide, and polyamide.

• Advantages: Permanent elasticity, high durability in movement joints.

• Applications: Bridge expansion joints, runway sealing, façade joints in buildings.

 

2. Phenolic-Based Sealants

• Structure: A combination of phenol and formaldehyde; available in powder, liquid, or film forms.

• Advantages: High resistance to heat and thermal fluctuations; also offers adhesive properties.

• Applications: Plywood bonding, appliance assembly, and panel construction.

 

3. Epoxy-Based Sealants

• Structure: Typically two-component systems (resin + hardener).

• Advantages: Extremely high strength, excellent adhesion, chemical and electrical insulation.

• Applications: Electronics insulation, marine and aerospace sealing, automotive applications.

 

4. Acrylic Sealants

• Structure: Derived from acrylic acid; can cure thermally or at room temperature.

• Advantages: Paintable, low odor, UV resistant, suitable for indoor use.

• Applications: Sealing of window and door frames, drywall joints, interior finishing.

 

5. Silicone-Based Sealants

• Structure: Available in acetoxy (acidic) and neutral cure types.

• Advantages: High flexibility, thermal and chemical resistance, suitable for exterior use.

• Applications: Glass façades, shower enclosures, aluminum joinery, high-heat motor parts.

 

Material Compatibility

Choosing a sealant that is compatible with the substrate is critically important. Incorrect product selection can lead to poor adhesion, corrosion, discoloration, or mechanical failure.

 

Conclusion

Industrial sealants not only fill gaps but also enhance structural durability, prevent leakage, protect surfaces, and extend the lifespan of the application area. Each sealant type has a distinct chemical composition, curing mechanism, and application purpose, tailored to different industrial needs. Selecting the right product is essential for successful application. Environmental conditions, substrate type, and mechanical requirements must all be carefully considered.