| HS Code | 602430 |
| Product Name | Redispersible Polymer Powder for Tile Adhesives |
| Chemical Base | Vinyl Acetate-Ethylene (VAE) Copolymer |
| Appearance | White, free-flowing powder |
| Solids Content | 99% ± 1% |
| Bulk Density | 400 - 600 g/L |
| Ash Content | ≤ 12% |
| Ph Value 10 Aqueous Solution | 6.0 - 8.0 |
| Viscosity Brookfield 10 Solution | 1000 - 3000 mPa·s |
| Minimum Film Formation Temperature Mfft | 0°C to 5°C |
| Particle Size Retained On 100 Mesh | ≤ 2% |
| Re Dispersibility | Fully re-dispersible in water to form a stable emulsion |
| Adhesion Strength Tile To Concrete | ≥ 0.5 MPa |
As an accredited RDP for Tile Adhesives factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RDP for Tile Adhesives is packaged in 20 kg multi-layer paper bags with moisture-proof inner lining. |
| Container Loading (20′ FCL) | 20' FCL: Redispersible polymer powder for tile adhesives, packed in 25kg bags on pallets, loaded securely. |
| Shipping | RDP (Redispersible Polymer Powder) for tile adhesives ships as a fine, moisture-sensitive powder in laminated kraft paper bags on pallets. Ensure dry, ventilated container transport, avoiding rain, humidity, and direct sunlight. Properly secured cargo prevents bag damage. Non-hazardous classification allows standard freight, but handle carefully to preserve product integrity. |
| Storage | Store RDP (redispersible polymer powder) in a cool, dry, well-ventilated area. Keep away from moisture, direct sunlight, and high temperatures. Maintain original sealed packaging until use. Ensure pallets are elevated off the floor and protected from water. Under proper conditions, shelf life is typically 6–12 months from production date. Always rotate stock and follow first-expiry-first-out practices. |
| Shelf Life | Shelf life is 12 months from manufacture when stored unopened in a cool, dry place. |
Redispersible polymer powder in cementitious tile adhesives is produced by spray-drying aqueous vinyl acetate–ethylene or vinyl acetate–versatate copolymer dispersions, typically with 5.0–15.0 wt% polyvinyl alcohol protective colloid and 1.0–5.0 wt% inorganic anti-caking filler. Upon addition to water, the powder re-forms a polymer dispersion that coalesces into a film during cement hydration, bridging microcracks at the adhesive–tile interface and increasing adhesion to low-porosity surfaces. Commercial dosage in tile adhesive dry mixes ranges from 1.5 wt% to 6.0 wt% on total dry powder mass, depending on the deformation class, open-time requirement, and thermal exposure. Under the Construction Products Regulation, RDP-containing cementitious tile adhesives placed on the EU market must meet the classification and test requirements of EN 12004-1:2017 and ISO 13007-1:2014, with CE marking linked to initial type testing and factory production control. Silo moisture content for dry-mix plants is typically maintained below 0.2% by mass because partial polymer particle fusion caused by storage humidity above 60% RH reduces redispersibility and creates lump formation during site mixing.
In dry-mix plants producing C1-class cementitious tile adhesives, redispersible polymer powder is dosed at 2.0–3.0 wt% of total dry powder mass and is added after cement, graded sand, and cellulose ether have undergone 90–180 s of first-stage blending in a horizontal ploughshare mixer. The dosage range corresponds to a tensile adhesion requirement of ≥0.5 N/mm² under standard climate, water immersion, heat ageing, and freeze–thaw cycling as classified in EN 12004-1:2017 C1 and ISO 13007-1:2014 C1. The downstream production process involves mixing the bagged powder with water at a ratio of 0.20–0.24 L/kg, using a low-speed paddle mixer at 300–500 rpm for 120–180 s, followed by a 3–5 min slaking period and brief re-stirring; the resulting mortar is applied with a 6 mm notched trowel to plaster, concrete, or brick substrates. Terminal finished product types are 20–25 kg bagged C1 adhesive powders intended for interior ceramic wall and small-format floor tile installation where water immersion and thermal stress are limited. Field observation from dry-mix plants indicates that discharging blended powder at temperatures above 40°C promotes partial fusion of polymer particles with cellulose ether, reducing redispersibility and producing lump formation during site mixing; cooling jackets and post-blending resting silos are therefore used when ambient temperatures exceed 30°C.
When rectified porcelain tiles with face areas above 0.5 m² are installed in thin-bed configurations, elevated interfacial shear and tensile stresses arise from tile body moisture expansion, thermal expansion, and residual stress after calibration. In this application, the RDP dosage increases to 3.5–5.0 wt% of dry powder mass, and the adhesive is classified under EN 12004-1:2017 as C2E, with extended open time verified by EN 1346 requiring ≥0.5 N/mm² after a 30-minute open period. The downstream production sequence on site includes notched trowel application at 10–12 mm tooth depth, back-buttering of the tile with a thin contact layer, and solid-bed pressing to eliminate voids under the tile. Terminal finished product types are one-component C2E bagged adhesives designed for low-absorption porcelain, rectified-edged tiles, and floor formats up to 1200×1200 mm, where the polymer film compensates for the low capillary porosity of the tile body. Process control in tile adhesive manufacturing for C2E products requires high-shear dispersion of RDP into the dry mix without moisture ingress; batch-to-batch slump variation of ±10 mm under ISO 13007-1:2014 consistency screening can shift open time by 5–10 min, so silo moisture is maintained below 0.2% by mass.
| Application class | RDP dosage on dry mix | Performance classification | Reference test method | Minimum tensile adhesion |
|---|---|---|---|---|
| C1 interior wall/floor | 2.0–3.0 wt% | EN 12004-1:2017 C1 / ISO 13007-1:2014 C1 | EN 1348 dry, water, heat, freeze–thaw | ≥0.5 N/mm² |
| C2E large-format porcelain | 3.5–5.0 wt% | EN 12004-1:2017 C2E | EN 1346 30 min open time; EN 1348 | ≥1.0 N/mm² |
| C2 S1 exterior facade | 4.0–6.0 wt% | EN 12004-1:2017 C2 S1 | EN 1348; EN 12002 | ≥1.0 N/mm²; deformation ≥2.5 mm |
| C2 S2 underfloor heating | 4.0–5.5 wt% | EN 12004-1:2017 C2 S2 | EN 1348 after heat ageing; EN 12002 | ≥1.0 N/mm²; deformation ≥5.0 mm |
| Renovation low-absorption | 3.0–4.5 wt% | EN 12004-1:2017 C1/C2 | EN 1348 water immersion; EN 1346 | ≥0.5 N/mm² for C1; ≥1.0 N/mm² for C2 |
External facade tiling exposes the cementitious adhesive layer to wind-driven rain, UV-heated surface temperatures exceeding 70°C, and differential movement between structural concrete and ceramic cladding. RDP dosage for S1/S2 deformable adhesives is set at 4.0–6.0 wt% of dry mortar mass, and the mortar is formulated to achieve the deformation classifications of EN 12002, with transverse deformation of ≥2.5 mm for S1 and ≥5.0 mm for S2. Compliance is evaluated through EN 12004-1:2017 C2 S1 or C2 S2 by combining the ≥1.0 N/mm² tensile adhesion thresholds after dry, water immersion, heat ageing, and freeze–thaw storage with the corresponding deformability test. Manufacturing of these formulations typically employs two-stage blending in a twin-shaft mixer: cement and fine aggregate are homogenized for 60–90 s, then RDP and cellulose ether are added and dispersed for an additional 120–180 s at low shear to prevent thermal damage to the polymer particles. The terminal product is a high-deformation bagged adhesive for facade ceramic, porcelain, and lightweight cladding tiles on balconies, terraces, and ventilated building envelopes. An operational boundary applies when polymer content exceeds 5.5 wt%: early compressive strength can fall below the site load-bearing requirement for foot traffic within 24–48 h, and the adhesive may retain sufficient water to delay final set under cold conditions below 5°C. Field observations from facade installations in coastal environments show that hydroxyethyl cellulose and RDP interactions can produce a surface skin that limits evaporation during early curing, requiring the tiler to follow open-time control with wet-edge management rather than re-tempering the mortar with water.
In heated screed systems and underfloor heating circuits, the adhesive layer is subjected to repeated thermal expansion gradients through the screed–adhesive–tile composite, with surface temperatures cycling between 20°C and 40°C. The addition ratio of RDP at 4.0–5.5 wt% of dry powder mass is maintained to produce a C2 S1 or C2 S2 mortar classified under EN 12004-1:2017 and tested for elevated temperature tensile adhesion under EN 1348 after 14 days standard climate and 14 days ageing at 70°C, with ≥1.0 N/mm² required. Downstream production on the construction site includes application with a notched trowel of 8–10 mm, pressing of the tile with a slight sliding motion to collapse trowel ridges, and for tiles above 0.4 m², targeting contact coverage of ≥85% to avoid air pockets that create localised thermal resistance. Terminal finished product types are bagged one-component adhesives for ceramic and natural stone floor finishes over heated screeds and for use with low-profile underfloor heating mats. Field data from installation sites indicates that a sudden polymer dosage reduction below 4.0 wt% results in visible hairline cracking at tile joints after the first heating season when the heating manifold is commissioned without a gradual temperature ramp.
| Test method | Parameter evaluated | Conditioning or storage | Performance threshold |
|---|---|---|---|
| EN 1348 | Tensile adhesion strength | Dry, water immersion, heat ageing, freeze–thaw | C1 ≥0.5 N/mm²; C2 ≥1.0 N/mm² |
| EN 1346 | Open time | 20 min and 30 min after application | ≥0.5 N/mm² at 30 min for C2E |
| EN 12002 | Transverse deformation | 28 days standard cure | S1 ≥2.5 mm; S2 ≥5.0 mm |
| ISO 13007-1:2014 | Product classification | Cementitious adhesive type and class | C1/C2 plus optional F, T, E, S1, S2 designations |
Submerged basin tiling compounds polymer film formation with continuous water exposure and hydrostatic pressure, requiring a mortar that retains tensile adhesion after long-term immersion. In swimming pool and water containment lining work, the RDP addition is typically set at 4.0–5.5 wt% of dry mix mass, and the adhesive is selected as EN 12004-1:2017 C2 S1 or C2 S2 with additional project-specific verification through EN 1348 water immersion adhesion of ≥1.0 N/mm² after 7 days standard cure and 21 days immersion. On site, the mixed mortar is applied with a 4–6 mm notched trowel over a prepared cementitious waterproofing layer or directly onto concrete, followed by pressing of glass mosaic or glazed wall tile; grouting is delayed for at least 7 days after tiling to permit polymer coalescence and cement hydration. Terminal product types include bagged C2 S1/S2 adhesives for ceramic mosaic, glass mosaic, and fully vitrified tile in swimming pools, water features, and containment tanks. When hydrostatic pressure exceeds 2 m, published data for this specific configuration is limited, and adhesion verification through site mock-up panels is recommended.
Across renovation work on existing glazed tile, well-compacted power-troweled concrete, or hydrophobic gypsum board, the loss of mechanical keying shifts the load-carrying mechanism almost entirely to polymer film continuity at the interface. RDP is incorporated at 3.0–4.5 wt% of dry powder mass, and formulations are evaluated under EN 12004-1:2017 C1 or C2 depending on service exposure; when the substrate is classified as low-absorbing, the mortar is additionally tested to EN 1348 after water immersion and to EN 1346 open time at 30 min, with ≥0.5 N/mm² for C1 and ≥1.0 N/mm² for C2. The downstream process includes mechanical scarification or application of a styrene-acrylic primer to the existing glazed surface, followed by thin-bed adhesive application with a 6 mm square-notched trowel and periodic lifting of a freshly bedded tile to verify transfer coverage of ≥80% on the tile back. Terminal finished product types are bagged one-component adhesives for refurbishment tiling over ceramic, porcelain, terrazzo, and gypsum-based leveling compounds. A field-observed failure mode occurs when the wetting agent dosage is reduced without a corresponding increase in RDP; the adhesive then shows adequate initial grab but fails water immersion pull-off tests because the polymer film remains discontinuous at the glazed tile interface.
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RDP-5010 is a vinyl acetate–ethylene (VAE) redispersible polymer powder formulated for dry-mix cementitious tile adhesives under ISO 13007-2. The product consists of a VAE copolymer stabilised with polyvinyl alcohol as protective colloid and a mineral anti-caking agent. It is manufactured by spray drying an aqueous polymer dispersion, producing an off-white free-flowing powder with residual moisture below 1.0%. The material is intended for C2TE and C2TES1 tile adhesive classes where water-immersion adhesion, freeze-thaw durability, extended open time, and controlled wet slip are required. Model RDP-5010 is differentiated from RDP-5020 by its lower ethylene content and higher glass transition temperature; RDP-5020 is normally reserved for highly deformable S2 systems and polymer-modified grouts. The powder is supplied in 25 kg multi-wall paper bags with polyethylene liners. Table 1 lists the batch-release specification profile applied to each production lot.
| Property | Method or equipment | Specification |
|---|---|---|
| Apparent bulk density | ISO 60 | 450–550 g/L |
| Residual moisture | Mettler Toledo HR83 moisture analyser, 105°C | ≤ 1.0% |
| Ash content | ISO 3451-1:2019 | 12.0±2.0% |
| pH, 10% aqueous dispersion | ISO 976:2013 | 7.0–9.0 |
| Minimum film forming temperature | ISO 2115:1996 | 0±2°C |
| Glass transition temperature | ISO 11357-2:2020 | -5±2°C |
| Sieve residue on 250 μm | ISO 2591-1:2008 | ≤ 0.5% |
| Redispersed viscosity, 50% solids | Brookfield RV, spindle 3, 20 rpm, 25°C | 500–2000 mPa·s |
Film formation begins after mix water is removed by cement hydration and evaporation. The dispersed polymer particles coalesce when the mortar temperature exceeds the minimum film forming temperature of 0±2°C. Since the glass transition temperature of the VAE copolymer is -5±2°C by ISO 11357-2:2020, the coalesced film remains flexible at typical tile installation temperatures. In a cementitious tile adhesive, the redispersed polymer solids occupy the capillary pore space and form load-bearing polymer bridges between hydration products and the tile–mortar interface. The polyvinyl alcohol protective colloid redissolves in alkaline mix water and contributes to paste cohesion before film formation. At an addition rate of 2.5–3.0 wt% of dry mix, the polymer solids are sufficient to produce a continuous film network but not so high that the mortar becomes excessively sticky. Incomplete coalescence occurs when application is attempted below 5°C; this boundary is enforced because the minimum film forming temperature is close to 0°C. In the wet mortar, redispersion occurs within 60 s under low-shear mixing. Laser diffraction of a diluted redispersed sample typically shows a median particle size of 1–5 μm. The redispersed particles initially adsorb onto cement grains and aggregate surfaces; as water is consumed, the particles deform and interdiffuse. The ethylene units act as internal plasticisation, so no external coalescing solvent is required. This film formation contributes to adhesion by covering microcracks generated by drying shrinkage and thermal movement. Differential scanning calorimetry by ISO 11357-2:2020 confirms the absence of crystalline melting above 50°C, which supports retention of film integrity during elevated service temperatures.
Low addition rates create a discontinuous film volume in the hardened mortar. In freeze-thaw testing by EN 1348, the tensile adhesion criterion for C2 classification is ≥ 1.0 MPa. Formulations containing 1.0–1.5 wt% RDP-5010 may still achieve acceptable dry adhesion but often fail after water immersion or freeze-thaw cycling because the polymer bridges are discontinuous and hydraulic microcracking at the interface is not effectively arrested. The lower addition limit of 2.0 wt% is therefore set for frost-resistant C2 formulations. At 3.0 wt%, water-immersion adhesion and freeze-thaw adhesion are designed to meet the C2 minimum under EN 1348:2007. Above 4.0 wt%, the mortar may retain too much air during mixing and develop surface tack during extended open time; defoaming adjustments and validation in a horizontal ribbon mixer are required before increasing the dosage. The normal design window is 2.0–4.0 wt% of total dry mix, with 3.0 wt% as the starting point for C2TE and C2TES1 systems.
Direct substitution of RDP-5010 for a styrene–acrylic redispersible powder is not assignable by solids content alone. Styrene–acrylic powders typically require a different protective colloid balance and exhibit higher resistance to saponification in highly alkaline cement pores, while VAE powders such as RDP-5010 achieve transverse deformation at moderate film volume. Under EN 12002, S1 classification requires transverse deformation of ≥ 2.5 mm; RDP-5010 is formulated to support this at 2.5–3.0 wt% in a C2 base mix. Substitution should therefore be followed by full EN 1348 adhesion series and EN 12002 deformation testing before production release. Compared with polyvinyl alcohol-only adhesion promoters, RDP-5010 introduces a thermoplastic VAE phase that reduces brittle interfacial failure during thermal cycling; this difference is most apparent in the freeze-thaw sequence of EN 1348.
On industrial dry-mix lines, RDP-5010 is blended in horizontal ribbon mixers with a fill ratio of 70–80% and a tip speed of ≤ 5 m/s. Addition occurs after the cement and sand premix, before cellulose ether to reduce polymer dusting. The target mixing time is 3–5 min. Bulk density of 450–550 g/L supports gravimetric screw feeding without dense-phase air assist, but bridging can develop in silos when storage temperature exceeds 30°C or relative humidity exceeds 60%. The redispersed viscosity at 50% solids is specified as 500–2000 mPa·s on Brookfield RV spindle 3 at 20 rpm and 25°C. Quality control deviations above this band often indicate incomplete redispersion, agglomeration, or contamination with cement dust. High-shear plow mixers operating above 40°C may generate enough frictional heat to partially coalesce the powder, creating fingertip-visible polymer specks after wet mixing and reducing tensile adhesion under EN 1348. Particle size distribution of the powder should be checked when silo bridging occurs. A high sieve residue on 250 μm above 0.5% indicates agglomeration and will produce visual specks. In vertical continuous mixers, the powder is introduced through a side feed port rather than through the main aggregate stream to avoid segregation. If mixing time exceeds 8 min, the friction temperature may approach 40°C; thermocouples in the mixer discharge should interlock the addition of heat-sensitive additives.
C2TE classification requires simultaneous control of open time and wet slip. Open time is evaluated by EN 1346:2007 as the period in which tensile adhesion remains at least 0.5 MPa after the tile is placed on a notched mortar bed. RDP-5010 delays skin formation because the redispersed polymer and polyvinyl alcohol slow moisture release at the surface; a 30 min extended open time target is therefore achievable in formulations with 3.0 wt% polymer and 0.35 wt% cellulose ether. Wet slip under EN 1308:2007 is required to be ≤ 0.5 mm for T classification. The polymer alone does not provide slip resistance; rheology modifiers such as starch ether or high-viscosity cellulose ether are required. Transverse deformation for S1 under EN 12002:2008 is ≥ 2.5 mm. The ethylene segment in RDP-5010 reduces film modulus and allows the cured adhesive to accommodate substrate movement without adhesive failure. Outdoor large-format porcelain tile installations therefore commonly specify C2TES1 systems with 2.5–3.0 wt% RDP-5010. On high-porosity substrates, water demand increases and open time may shorten; this is not a polymer defect but a system variable. RDP-5010 cannot compensate for insufficient water retention. Wet slip is more difficult to control in heavily polymerised adhesives because the polymer film migrates to the surface; using a starchy modifier at 0.05–0.10 wt% is typical.
Pneumatic conveying of RDP-5010 into storage silos should use dried compressed air with a pressure dew point below -20°C to prevent moisture sorption and filter blockage. Screw metering is performed with 40 mm diameter auger elements and 10 mm pitch at rates of 0.5–5.0 kg/min; gravimetric loss-in-weight feeders with ± 0.5% accuracy are recommended for C2TE batch consistency. In continuous production, the powder is dosed after milled sand and cement but before cellulose ether to improve dispersion and reduce dust burden in the baghouse. Water demand in the wet-mix tile adhesive increases by 1–2 percentage points relative to the unmodified base mix; typical final water addition is 22–26 wt% of dry mix. After mixing at 23°C, pot life remains usable for 4 h, after which loss of workability is controlled by cement hydration rather than polymer coalescence. Batch-to-batch variation is controlled by monitoring residual moisture and redispersed viscosity. A shift in residual moisture from 0.5% to 1.0% can reduce flow in screw feeders but does not normally change wet adhesion; variation in ash content above 14.0% indicates excess anti-caking agent and may require reformulation because the polymer content is diluted. On production lines, the largest failure mode observed in C2TE systems is not incomplete adhesion but air entrapment during mixing; this is addressed by adjusting defoamer at 0.05–0.10 wt% of dry mix and monitoring wet density with a graduated funnel. Quality control according to ISO 13007-2 therefore includes the full EN 1348 adhesion sequence and EN 12002 transverse deformation for each new lot of cement and RDP combination.
| Performance parameter | Standard method | C2TE requirement | C2TES1 requirement |
|---|---|---|---|
| Tensile adhesion after dry storage | EN 1348:2007 | ≥ 1.0 MPa | ≥ 1.0 MPa |
| Adhesion after water immersion | EN 1348:2007 | ≥ 1.0 MPa | ≥ 1.0 MPa |
| Adhesion after heat ageing | EN 1348:2007 | ≥ 1.0 MPa | ≥ 1.0 MPa |
| Adhesion after freeze-thaw cycles | EN 1348:2007 | ≥ 1.0 MPa | ≥ 1.0 MPa |
| Open time after 30 min | EN 1346:2007 | ≥ 0.5 MPa | ≥ 0.5 MPa |
| Wet slip | EN 1308:2007 | ≤ 0.5 mm | ≤ 0.5 mm |
| Transverse deformation | EN 12002:2008 | Not required | ≥ 2.5 mm for S1; ≥ 5 mm for S2 |
Storage must remain between 5°C and 30°C with relative humidity below 60%. Unopened shelf life is 12 months from production date under these conditions. The powder should not be stored adjacent to heat sources above 40°C because the VAE particles can sinter and lose redispersibility. Wet-mixed tile adhesive should not be applied on substrates below 5°C; below this temperature the minimum film forming temperature of 0±2°C prevents reliable film coalescence and tensile adhesion is compromised under EN 1348. The product is incompatible with high-dose acid-based cement accelerators because a rapid pH reduction can destabilise the polyvinyl alcohol protective colloid before film formation. It is also not recommended for anhydrite screed compositions with high calcium sulfate content; published data for this specific configuration is limited. When lithium silicate densifiers or solvent-free epoxy primers are applied over aged tile adhesive, compatibility testing under EN 1348 should be performed because these surface chemistries can alter interfacial bonding. For regulatory compliance, RDP-5010 is assessed under REACH and packaging carries lot-number traceability. Heavy metal restrictions under RoHS are met by the mineral anti-caking agent specification. No food-contact status is claimed for this product.
