Internal and External Sealants – What is the difference?
What Are Sealants and Why Do They Matter?
Sealants are essential materials used to seal, block, or close gaps between building materials, preventing air and fluids, such as rainwater and condensation, from passing through into a building. They play a crucial role in construction projects by ensuring the integrity and durability of structures. They are commonly made from materials such as silicone, polyurethane, and acrylic, each offering unique properties suited to different applications. By understanding the role of sealants, you can ensure your projects are protected from the elements and built to last.
Understanding External Sealants
External sealants are designed for outdoor applications, such as roofing, window frames, and other outdoor structures. Key properties of external sealants include weather resistance, UV stability, flexibility, and strong adhesion. These characteristics ensure that the sealants can withstand harsh environmental conditions and maintain their effectiveness over time.
Common Types of External Sealants
- Silicone-based sealants: Known for their excellent weatherproofing and longevity, making them ideal for various outdoor applications.
- Polyurethane sealants: Valued for their durability and expansion capabilities, suitable for areas subject to movement and stress.
- FA880 Premium Natural Stone Silicone Matt: Sealing of movement joints between natural stone as well as for joints with other construction materials like concrete, ceramics, metals, glass, PVC and primed wood.
- FS125 Premium Frame & Façade Silicone: Ideal for use in expansion and curtain wall joints, perimeter joints around windows or doors, panel joints between most common substrates, heel and toe beads, polycarbonate glazing and other general joint sealing applications.
Understanding Internal Sealants
Internal sealants are used for indoor applications, such as bathrooms, kitchens and flooring. They are designed with features like mould resistance and ease of application to ensure a safe and healthy indoor environment.
Common Types of Internal Sealants
- Acrylic-based sealants: These are paintable and friendly to indoor air quality, making them suitable for various interior applications.
- Water-based silicone: Offers excellent moisture resistance, ideal for use in bathrooms and kitchens.
- Latex sealants: Known for their easy cleanup and flexibility, perfect for interior walls and trim.
- GS123 Sanitary Silicone: A sanitary grade, acetoxy silicone sealant with excellent resistance to mould and mildew. Can be used in bathrooms, kitchens and similar applications.
- LD730 Acrylic Sealant: A flexible mould resistant acrylic sealant for use in internal painting and decorating.
Key Differences Between External and Internal Sealants
When comparing external and internal sealants, it's essential to consider their properties, durability, and application areas. External sealants are designed to withstand harsh weather conditions, while internal sealants focus on indoor air quality and ease of use. Using the wrong type of sealant can lead to failure, so it's crucial to choose the right one for your specific needs.
How to Choose the Right Sealant for Your Project
When selecting a sealant, consider factors such as exposure to elements, movement tolerance, and ease of maintenance. Reading product labels and understanding performance ratings can help you make an informed decision. Look for sealants that meet the specific requirements of your project to ensure long-lasting results. Read more here: Hybrid, Silicone and Acrylic Sealants: Are you using the correct Sealant | Illbruck
Application Tips and Best Practices
Proper surface preparation is key to achieving long-lasting adhesion. Clean and dry the surfaces before applying the sealant. Avoid common mistakes such as over-application or using the wrong type of sealant for the job. Following these best practices will help you achieve a professional finish.
Final Thoughts
Choosing the right sealant is crucial for the success of your project. By understanding the differences between internal and external sealants and considering your specific needs, you can make informed decisions that ensure the durability and integrity of your work. Remember, the right sealant can make all the difference in sealing the deal.
Contact the illbruck technical team here to find out more.
