Construction RDP powder, also known as redispersible polymer powder (RDP) or redispersible latex powder (RLP), is a dry, free-flowing powder used as an additive in construction mortar. It’s typically made from a synthetic polymer, such as vinyl acetate-ethylene (VAE), which is spray-dried to form a fine powder.
When RDP is mixed with water, it readily redisperses to form a latex emulsion, which acts as a binder in the mortar. This significantly enhances the mortar’s various properties, making it more suitable for construction applications. Here are some key benefits of using RDP in construction mortar:
- Improved workability: Makes the mortar easier to mix, apply, and manipulate, leading to smoother finishes and increased efficiency.
- Enhanced adhesion: Strengthens the mortar’s bond to various substrates like concrete, brick, and tile, ensuring a more durable and long-lasting construction.
- Increased flexibility: Reduces the risk of cracking in the mortar, especially important in areas prone to movement or thermal expansion and contraction.
- Improved water resistance: Enhances the mortar’s ability to repel water, preventing water damage and ensuring better structural integrity.
- Enhanced freeze-thaw stability: Improves the mortar’s ability to withstand freeze-thaw cycles, making it suitable for use in climates with extreme variations in temperature.
Due to its numerous benefits, RDP is widely used in various dry-mix mortar applications within the construction industry, including:
- Tile adhesives: Bonds ceramic, porcelain, and stone tiles to various surfaces.
- Self-leveling underlayments: Creates a smooth and level surface for the installation of floor coverings.
- Grouts: Fills the gaps between tiles and provides a watertight seal.
- Wall plasters: Creates a smooth and decorative finish on interior and exterior walls.
- Renderings: Provides a protective layer to exterior walls, improving weather resistance and aesthetics.
- Exterior insulation finishing systems (EIFS): Creates a continuous, weather-resistant exterior wall system for buildings.
