Product Name: Generic RDP (Vinyl Acetate-Ethylene Copolymer)
CAS Number: 24937-78-8
General Description
Redispersible Polymer Powder (RDP) is a free-flowing, white powder obtained by spray-drying a vinyl acetate-ethylene (VAE) copolymer emulsion. It is designed for use in the construction industry to enhance the properties of cement-based and gypsum-based dry-mix mortars. Upon mixing with water, it redisperses into a stable emulsion, forming a flexible film with excellent adhesion and mechanical properties.
Typical Applications
- Tile adhesives
- Exterior Insulation and Finish Systems (EIFS)
- Wall putty and skim coats
- Self-leveling compounds
- Repair mortars
- Waterproofing mortars
Technical Specifications
| Property | Value |
| Appearance | White to off-white free-flowing powder |
| Polymer Base | Vinyl Acetate-Ethylene (VAE) |
| Protective Colloid | Polyvinyl Alcohol (PVOH) |
| Solid Content | ≥ 98% |
| Ash Content | 10–12% (at 1000°C) |
| Bulk Density | 400–600 g/L |
| Particle Size | ≤ 4% retained on 500 μm sieve |
| Glass Transition Temp (Tg) | 5–15°C (depending on grade) |
| Minimum Film Forming Temp | ≈ 0–5°C |
| pH (10% dispersion in water) | 6.0–8.0 |
Performance Properties
- Redispersibility: Forms a stable emulsion when mixed with water.
- Film Formation: Creates a flexible, tough film upon drying, enhancing adhesion and durability.
- Adhesion: Improves bonding strength to various substrates (concrete, wood, tiles, etc.).
- Water Resistance: Enhances resistance to water ingress (hydrophobic grades available).
- Flexibility: Increases flexibility and reduces cracking in mortars.
- Workability: Improves water retention, open time, and ease of application.
Storage and Handling
- Storage Conditions: Store in a cool, dry place (5–30°C), away from moisture, direct sunlight, and heat sources.
- Shelf Life: Minimum 12–24 months under proper storage conditions.
- Packaging: 25 kg multi-layer paper bags with inner polyethylene lining.
Safety Information
- Non-hazardous under normal handling conditions.
- Avoid inhalation of dust; use protective equipment (mask, gloves) if necessary.
- Consult the Safety Data Sheet (SDS) for detailed handling instruction.
Usage Guidelines
- Mixing: Blend with dry components (cement, sand, etc.) before adding water. Typical dosage: 1–5% by weight of total dry mix, depending on application.
- Water Addition: Adjust water content to achieve desired consistency; RDP improves water retention, reducing the amount needed.