Product Introduction
Redispersible Polymer Powder (RDP) is a free-flowing white powder produced by spray-drying polymer emulsion, mainly based on vinyl acetate-ethylene copolymer. Once mixed with water, it can re-form a stable polymer emulsion with the original film-forming performance.
When added into dry-mix mortar, RDP forms a continuous flexible polymer film inside the hardened mortar matrix. This film greatly improves adhesion strength, flexibility, impact resistance, water resistance and abrasion resistance. It compensates the brittleness defect of pure inorganic cementitious materials.
RDP is widely combined with HPMC, starch ether and other additives. It is a core functional additive for high-performance building mortars. For tile adhesive, RDP improves tile bonding strength and thermal shock resistance; for exterior insulation mortar, it enhances crack resistance and waterproof performance; for self-leveling, it optimizes surface toughness and prevents peeling. In putty and repair mortar, it increases surface cohesion and reduces powdering.
Our RDP series has stable film-forming temperature and good redispersibility. It can adapt to different construction climates and alkaline cement systems. Different grades are customized to balance flexibility, hardness, water resistance and open time, to match various downstream mortar formulations.
POINTS FOR ATTENTION
ORDER INSTRUCTIONS
- Confirm the exact RDP grade before order: RDP 5010 / 5020 / 5030 / 5040. Each grade has different MFFT, flexibility and water resistance, which directly decide final mortar performance.
- Specify particle size requirement. Standard grade is 80 mesh; finer 100 mesh option is available for putty and thin-layer coating to reduce visible speckles.
- Select packing option: 25kg kraft paper bag with inner PE liner, 25kg plastic drum, 500kg or 1000kg jumbo bag. Palletized packaging is strongly recommended for sea freight to avoid bag rupture and moisture absorption.
- Inform us of your main formulation system: tile adhesive, external insulation mortar, self-leveling, gypsum plaster, waterproof coating or wall putty. Our technical team can verify grade matching with HPMC and starch ether.
- Minimum bulk order quantity is 1 ton. 25kg sample package is available for lab testing and pilot mixing before mass production.
- Clarify required documents: TDS, COA, MSDS, Certificate of Origin. We provide complete document set for import customs clearance.
- Stock grades lead time: 5–7 working days. Customized RDP with special MFFT or ash content needs 14–20 working days production cycle.
- Notify if your destination area is high humidity or rainy season, we will upgrade moisture-proof inner film and reinforce pallet wrapping.
USAGE NOTES
- RDP is designed for dry-mix blending. Mix uniformly with cement, sand, fillers, HPMC, starch ether and other additives in dry state, then add water on construction site.
- Do not pre-disperse RDP separately in hot water above 60℃. High temperature will damage polymer emulsion film-forming ability and reduce final bonding strength.
- Recommended dosage range: 1.0%–3.5% based on total dry powder weight. Higher dosage improves flexibility and water resistance, but increases material cost and may slow hardening speed.
- RDP performs stable in alkaline cement and gypsum systems. Strong acidic raw materials mixed together will break polymer chains and cause permanent performance loss.
- Dry mixing sequence: pre-blend RDP with other micro-additives first to form additive masterbatch, then add into cement and sand. This avoids local high concentration agglomeration.
- After the mortar is mixed with water, finish construction within its open time. Re-stirring cured leftover slurry cannot recover original film-forming performance.
- Seal and store in cool dry warehouse. Damp RDP powder loses free-flow property, agglomerates and cannot redisperse normally, leading to unstable batch quality.
- When compounding: RDP provides adhesion, flexibility and water resistance; HPMC controls water retention; starch ether provides anti-sagging and anti-slip. Adjust three additives separately to balance construction performance.
COMMON FORMULAS
Reference dry-mix formulas by weight percentage, only for laboratory trial and formulation adjustment.
| Formula 1: C2 High Performance Tile Adhesive (RDP 5030) | |
|---|---|
| Portland cement | 36.0% |
| Quartz sand | 58.55% |
| Calcium carbonate | 3.0% |
| HPMC | 0.20% |
| Starch Ether | 0.05% |
| RDP 5030 | 2.20% |
| Formula 2: External Insulation Base Coat (RDP 5020) | |
|---|---|
| Portland cement | 32.0% |
| Quartz sand | 62.7% |
| HPMC | 0.25% |
| RDP 5020 | 3.0% |
| Defoamer, fiber | 2.05% |
| Formula 3: Cement Self-leveling Compound (RDP 5040) | |
|---|---|
| Portland cement | 45.0% |
| Quartz sand | 46.3% |
| Calcium carbonate | 5.0% |
| Superplasticizer | 0.40% |
| RDP 5040 | 2.80% |
| Retarder, defoamer | 0.50% |
COMMON PROBLEMS IN DOWNSTREAM PRODUCTION
- Low tile bonding strength, easy tile peeling: Selected RDP grade has insufficient film strength or dosage is too low. Switch to RDP5030 and increase dosage properly. Also check HPMC water retention; rapid water loss will stop polymer film formation.
- Mortar surface cracks after curing: RDP dosage insufficient or wrong grade with poor flexibility. RDP5020 is preferred for anti-crack systems. Excessive sand proportion and too fast drying speed also cause cracking.
- Poor water resistance of finished mortar: Standard flexible grade cannot meet waterproof requirement. Use high water-resistant RDP 5030. Confirm cement dosage and avoid excessive calcium carbonate filler.
- Agglomerated rubber powder particles appear on mortar surface: Damp RDP raw material, or poor dry mixing efficiency. RDP absorbs moisture inside bags; check packaging seal. Pre-mix RDP with fine filler to improve dispersion.
- Unstable test results between production batches: Micro-additive mixing uniformity is poor. RDP addition ratio is relatively low. Prepare additive masterbatch instead of direct single-point feeding.
- Self-leveling surface has pinholes and bubbles: RDP increases system viscosity and traps air. Add compatible defoamer and control stirring speed and stirring time after adding water.
- Film cannot form under low-temperature construction: MFFT of selected grade is too high. Change to low film-forming temperature grade RDP5040 for cold climate projects.
- Dry mortar long-term storage causes performance decline: RDP absorbs water vapor through bag gaps. Use aluminum liner packaging, control warehouse humidity below 60%RH and shorten stock cycle.
- Mortar becomes too sticky and hard to trowel: Overdosage of RDP. Reduce rubber powder content and adjust HPMC dosage together to keep suitable workability.
- Insulation base coat cracks after thermal cycling test: Polymer film toughness not enough. Upgrade RDP grade, or increase fiber content to cooperate with RDP anti-crack system.
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FAQ
PRICE INFORMATION
- Quotation Basis: CMC price depends on product grade, viscosity, substitution degree, order quantity and delivery terms.
- Price Validity: All quotations are subject to market raw material fluctuation. Normally valid for 7 days unless otherwise specified.
- Price Contains: The quoted price covers product cost and standard export packaging. Freight, insurance and export charges are calculated separately according to Incoterms.
- Tax & Invoice: Commercial invoice for export will be provided. Relevant export tax formalities can be handled.
- Payment Discount: Better price can be offered for larger repeated orders. Please contact us for the latest formal quotation.
DELIVERY TIME & SHELF LIFE
- Production Lead Time: 7–15 working days after receiving your deposit, subject to factory production schedule.
- Shipping Arrangement: After production completion, we will book container and arrange shipment. Port space availability may affect the departure date.
- Transit Time: Sea transit time varies according to destination port, generally ranges from 15 to 45 days.
- Shelf Life: 24 months from production date when stored under proper dry and cool conditions with original sealed packaging.
- Storage Warning: Once the bag is opened, please consume as soon as possible and keep away from moisture, high temperature and direct sunlight.
PRODUCT QUALITY
- Raw Material Inspection: All raw materials are strictly inspected before entering production line to guarantee stable base quality.
- In-process Monitoring: Continuous online monitoring during production for viscosity, substitution degree and moisture content.
- Batch Test: Every finished batch will be sampled and tested before delivery. Qualified report will be provided together with shipment documents.
- Consistency Control: Automated production lines reduce batch difference, ensuring stable performance for repeated orders.
- Quality Support: We accept third-party inspection before shipment. Technical team offers after-sales technical support for quality related issues.
ABOUT US
- Headquartered in Shijiazhuang: Based in Shijiazhuang, Hebei, a globally influential fine chemical production hub with huge capacity and full industrial chain to ensure stable raw materials and bulk supply.
- Geographic Advantage: Convenient inland transport near Tianjin and Qingdao ports, supporting fast container shipment and competitive export logistics cost.
- Full-chain Supplier: One-stop provider of fine chemical additives and matching production equipment, custom service available beyond cellulose ethers.
- Technical Team: Professional team supplies formula consultation, sample testing and product selection for various industrial projects.
- Global Export: Years of export experience, providing reliable goods, full export documents and timely after-sales technical support.
相关产品及设备
USEFUL LINKS
- AIChE https://www.aiche.org/
- IChemE https://www.icheme.org/
- Cheresources https://www.cheresources.com/
- NIST Chemistry WebBook https://webbook.nist.gov/chemistry/
- AspenTech https://www.aspentech.com/
- DECHEMA https://www.dechema.de/en.html
- ChemEngPlanet https://www.chemengplanet.com/
- PubChem https://pubchem.ncbi.nlm.nih.gov/
- Chemical Processing https://www.chemicalprocessing.com/
- ChemIndustry https://www.chemindustry.com/
- PharmaChemEngineer https://www.pharmachemeng.com/
- GlobalSpec https://www.globalspec.com/