What is RDP Powder?
RDP powder, developed by Mr. Wacker in the 20th century, is a water-soluble, free-flowing, dispersible polymer powder produced by spray drying. This ethylene vinyl acetate latex powder with special polyvinyl alcohol as the protective colloid can quickly disperse in water and form an emulsion. RDP latex powder is made of dispersible colloids, polymeric resins, additives, protective colloids, anti-caking agents, etc. It is widely used as a binder in building materials due to its outstanding ability to improve the adhesion, flexibility, alkali resistance, flexural strength, waterproofness, plasticity, and wear resistance of mortar.
What is the TG value?
1. TG(Glass Transition Temperature) refers to the temperature at which amorphous polymer, including the amorphous portion of crystalline polymer, changes from a glass state to a highly elastic state. At this point, the material changes from a rigid solid state to a flexible, rubber-like state. The polymer exhibits elasticity above this temperature and brittleness below it.
2. RDP latex powder with a TG value below 0℃ is what we call flexible RDP Powder, while those with a TG value above 10℃ are a rigid type. The flexible latex powder with low TG value is widely used in projects needing movement tolerance, such as exterior mortars, flexible tile adhesives, or mortars over plywood. Conversely, the latter would be ideal in applications requiring structural stability, such as tile adhesive for stable surfaces, self-leveling compounds, or rigid mortars.
| Property | High TG (Above 10℃) | Low TG Value (Below 0℃) |
| Performance | Rigid Redispersible Polymer Powder | Flexible Redispersible Polymer Powder |
| Elasticity | Low elasticity, forming stiff, less deformable films. | High elasticity, allowing mortar to withstand movement without cracking. |
| Tensile Strength | Higher tensile strength; resists deformation but may be brittle. | Lower tensile strength; accommodates slight deformations under stress. |
| Film Formation | Form thicker, less flexible films that are more resistant to deformation. | Form thin, pliable films that allow deformation without cracking. |
| Adhesion | High adhesion to substrates, ideal for rigid, stable surfaces. | Good adhesion with added flexibility, suitable for dynamic substrates. |
| Applications | tile adhesives for stable surfaces, self-leveling compounds, or rigid mortars. | exterior mortars, flexible tile adhesives, EIFS system, or mortars over plywood. |
| Crack Resistance | Lower crack resistance due to reduced flexibility; may crack under stress or substrate movement. | Higher crack resistance; bridges micro-cracks and adapts to substrate movement. |
| Water Resistance | Often paired with hydrophobic additives for enhanced water resistance. | May have slightly lower water resistance, but can be formulated for hydrophobicity. |
| Workability | Provides good workability but is less adaptable to dynamic conditions. | Enhances workability and plasticity, especially in environments with vibrations or thermal changes. |
Choose ACCURATE Redispersible Latex Powder based on TG Value
As a flagship among Chinese RDP powder manufacturers, LANDU develops our brand, Accurate, specializing in Redispersible Polymer Powder. We could help you choose from various RDP latex powders based on your specific requirements. Here are four recommended products for your consideration.
Accurate Redispersible Latex Powder 4025N
Similar to Vinnapas 4023N, Accurate 4025N is a flexible RDP powder with a TG value of 0℃. It makes mortar easier to apply and less likely to stick to the scraper. It also endows the mortar with great wettability. Free from additional plasticizers, the mortar with ACCURATE 4025N could remain flexible over time. 4025N RDP powder also gives mortar balanced adhesion with inorganic substrates such as cement and organic substrates such as EPS. Plus, 4025N latex powder performs great crack resistance even at low temperatures, as well as water resistance with a high retention value of immersion strength and rapid strength recovery.
Accurate dispersible latex powder 4025N is a good choice for EIFS systems, concrete repair mortar, C1 and C2 flexible tile adhesives, self-leveling compounds, decorative mortar, and wall putty.
Accurate Redispersible Latex Powder 5011N
With a Glass Transition Temperature of 15℃, Accurate 5011N can serve as an alternative to Vinnapas 5010N. Mortar with a small amount of 5011N powder exhibits high adhesion, cohesion, wear resistance, workability, and stability in alkaline environments.
This rigid RDP additive is particularly suitable for tile adhesive, both interior and exterior wall putty, self-leveling compounds, and gypsum-based plastering materials.
Accurate Redispersible Latex Powder 5045N
Accurate Redispersible Latex Powder 8035H
WACKER Vinnapas 8034H can be replaced by Accurate 8035H with a TG value of -12℃. This flexible polymer powder product imparts excellent hydrophobicity to the mortar and does not affect the water vapor permeability of the material during normal usage. Mortar mixed with 8035H will not become difficult to mix with water after long-term storage. It also provides enhanced water resistance, allowing the mortar to quickly restore strength.
So with all that, Accurate 8035H redispersible polymer powder is optimal for mortar in contact with steel that demands high water repellency, including waterproof mortar, tile grout, cement-based self-leveling compounds, and skim coat.
