| HS Code | 715274 |
| Rdp Chemical Base | Vinyl Acetate-Ethylene (VAE) copolymer |
| Appearance | White powder |
| Active Polymer Content | ≈99% |
| Bulk Density | 450–650 g/L |
| Ash Content | ≤12% |
| Ph 10 Aqueous Dispersion | 6.0–8.0 |
| Minimum Film Forming Temperature | 0–5°C |
| Particle Size Passing 100 Mesh | ≥95% |
| Residue On 400 μm Sieve | ≤0.5% |
| Tensile Adhesion Strength 28 Days | ≥0.5 N/mm² |
| Open Time | ≥20 minutes |
| Water Resistance 7 Day Immersion Tensile Adhesion | ≥0.5 N/mm² |
As an accredited RDP for C1 Grade Tile Adhesives factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RDP for C1 Grade Tile Adhesives is packaged in 25 kg moisture-proof multi-layer paper bags, ensuring safe storage and easy handling. |
| Container Loading (20′ FCL) | RDP for C1 Grade Tile Adhesives is loaded as a 20′ FCL, typically in palletized bags, ensuring safe, efficient transport. |
| Shipping | RDP for C1 Grade Tile Adhesives is shipped in 25 kg multi-layer kraft paper bags with polyethylene liners, palletized and wrapped for protection. It requires dry, ventilated conditions, avoiding moisture and direct sunlight. Non-hazardous cargo; handle gently to prevent bag damage during transport and storage. |
| Storage | Store RDP (redispersible polymer powder) in a cool, dry, well-ventilated area, away from direct sunlight and moisture. Keep bags tightly sealed on pallets, off the ground, and protected from humidity. Avoid exposure to high temperatures or condensation. Use within six months from production; reseal partially used bags immediately. |
| Shelf Life | Store in a cool, dry place in unopened packaging. Shelf life is typically 12 months from production date. |
Interior ceramic wall tiling over cement-lime plaster and gypsum board represents the largest downstream volume for C1-grade dry-mix adhesives. A production-scale batch is typically proportioned with CEM I 42.5 R at 36–40 wt%, silica sand 0.1–0.5 mm at 55–60 wt%, a VAc/E or VAc/VeoVa redispersible polymer powder with glass transition temperature between -12 °C and +2 °C at 2.0–3.0 wt%, methyl hydroxyethyl cellulose at 0.35–0.45 wt%, and calcium formate accelerator at 0–0.8 wt%. The dry blend is processed in a 500 L horizontal ploughshare mixer with main shaft speed 90–120 rpm and batch time 180–240 s; discharge temperature is held below 45 °C because premature thermal softening of the RDP particles above this threshold produces hard agglomerates that do not fully redisperse on site. Residual moisture in the bagged powder is held at or below 0.3 wt% because higher moisture uptake causes irreversible RDP caking in silos and bulk bags. At the jobsite, 0.22–0.26 L water per kg powder is mixed for 120 s, left to slake for 5 min, and remixed for 15 s. The terminal product is 600 x 600 x 9 mm glazed ceramic wall tile with water absorption 6–12 % installed at 3–5 mm bed thickness. Compliance is against ISO 13007-1:2014 class C1 and adhesion is tested under EN 1348:2007; the minimum tensile adhesion strength after standard conditioning is 0.5 N/mm². RDP dosages below 2.0 wt% on gypsum board reduce wet adhesion due to insufficient polymer film at the gypsum-adhesive interface, while dosages above 3.5 wt% extend open time but delay early strength development, which can increase vertical slip on lightweight wall substrates.
| Property | Test method | C1 threshold |
|---|---|---|
| Tensile adhesion strength, standard cure | EN 1348:2007 | ≥ 0.5 N/mm² |
| Tensile adhesion after water immersion | EN 1348:2007 | ≥ 0.5 N/mm² |
| Tensile adhesion after heat ageing | EN 1348:2007 | ≥ 0.5 N/mm² |
| Tensile adhesion after freeze-thaw cycling | EN 1348:2007 | ≥ 0.5 N/mm² |
Low-porosity porcelain floor tile with water absorption below 1.0 % produces a near-zero suction interface, which shifts the failure mode from cohesive cement fracture to adhesive debonding at the tile back if polymer dosage is insufficient. In this downstream segment the RDP is raised to 2.5–3.5 wt% of total dry mix and cement content is held at 35–38 wt%; the remaining filler is fine quartz 0.1–0.3 mm to ensure a continuous contact layer without excessive void formation. The relevant terminal product is 1200 x 600 x 10 mm porcelain tile bedded over a C20/25 concrete slab using a 10 mm notched trowel. On low-porosity tile, back-buttering is mandatory because entrapped air at the interface can reduce effective bonding area by up to 30 % and produce variable EN 1348:2007 pull-off results across the same floor. The mixed adhesive has a wet density of 1.65–1.75 kg/L and a pot life of 90–120 min at 23 °C. Water immersion adhesion is the controlling requirement for this application; a C1 adhesive with 3.0 wt% VAc/E RDP commonly exhibits 0.5–0.7 N/mm² after water immersion conditioning, while the same formulation below 2.0 wt% can fall below 0.5 N/mm² due to water ingress at the tile-adhesive interface. The polymer film forms only after cement hydration consumes capillary water and the dispersed polymer particles coalesce; therefore early water exposure before 7 days can wash out uncoalesced RDP from the surface layer and reduce long-term adhesion.
On exterior facades, the adhesive bed is exposed to cyclic water uptake, UV heating of the tile surface, and temperature excursions from -10 °C to +60 °C. The C1 grade is specified only in moderate climates and for small-format facade tiles up to 0.1 m² with maximum long side 300 mm because the bare C1 classification does not include crack-bridging or deformability capacity. The dry mix ratio is adjusted to RDP 3.0–4.0 wt%, cement content 38–42 wt%, and graded quartz 0.1–0.5 mm to compensate for higher water demand and to maintain freeze-thaw resistance. Mixing water is 0.24–0.28 L/kg; the wet adhesive is applied at 3–5 mm thickness with a 6 x 6 mm notched trowel onto mineral render. The terminal product is 300 x 300 x 8 mm porcelain or terracotta facade tile. Freeze-thaw conditioning under EN 1348:2007 requires 25 cycles of temperature cycling; adhesion after freeze-thaw must remain at or above 0.5 N/mm². RDP modification improves freeze-thaw resistance by forming a continuous polymer film across micropores, but if dosage exceeds 4.0 wt%, the adhesive becomes excessively thixotropic and can entrap air during high-speed site mixing, producing 2–4 mm voids that reduce load transfer at wind-loaded wall positions. At wind speeds above 5 m/s, open time can fall below 10 min unless the facade is shielded or the substrate is pre-wetted.
Prolonged water immersion in showers, communal bathroom floors, and pool shells shifts the failure plane toward the polymer-cement interphase if the RDP film is not sufficiently hydrolytically resistant. For this application the C1 mortar is prepared with 3.0–3.5 wt% RDP based on a VAc/VeoVa copolymer, which is preferred over high-ethylene VAc/E grades because it produces a harder film after cement hydration and does not soften excessively in warm water. The cementitious binder is CEM I 42.5 R at 36–39 wt%, with fine quartz 0.1–0.3 mm at 55–58 wt% and MHEC 0.4–0.5 wt%. The terminal product is 150 x 150 x 6 mm glazed ceramic mosaic tile applied at 2–4 mm bed thickness over a cementitious waterproofing membrane. The membrane must be cured at least 7 days before adhesive installation; otherwise residual alkalinity and moisture from the membrane can retard cement hydration and lower adhesion. Solvent-based waterproofing primers must be fully cured before adhesive application because residual solvent retards polymer film coalescence and produces adhesion values below 0.5 N/mm². Under EN 1348:2007 water immersion conditioning, the requirement is ≥ 0.5 N/mm²; published commercial data for C1 mortars in permanent immersion at 23 °C indicate values between 0.5 N/mm² and 0.8 N/mm² after the standard conditioning period. At water temperatures above 30 °C, softening of the polymer phase can increase creep under tile load; for continuously submerged pool shells, a C2 or C2S1 adhesive is often specified despite the C1 classification being technically permissible under ISO 13007-1:2014.
At dry-bulk temperatures above 35 °C and relative humidity below 25 %, the open time of a C1 dry mix is controlled less by RDP dosage than by the combination of cellulose ether grade and polymer film formation at the exposed surface. A C1E-classified adhesive is required where open time exceeds 30 min; the formulation typically contains 2.5–3.0 wt% RDP and 0.45–0.55 wt% MHEC with modified hydroxyethyl substitution to raise water retention under rapid skinning conditions. The production process requires the RDP to be added last after sand and cement have been homogenized for 120 s; this sequencing prevents electrostatic adherence of polymer particles to the mixer wall and reduces batch-to-batch variation in open time. The dry powder is discharged through a 250 µm sieve after mixing, and moisture content is checked by Karl Fischer titration at ≤ 0.2–0.3 wt%. The terminal product is a site-mixed C1E adhesive for 900 x 900 x 9 mm porcelain floor tiles in desert climates. On the jobsite, the adhesive is mixed at 0.23–0.27 L/kg and applied with a 10 mm notched trowel; after 30 min of open time, a tile is placed and the assembly is conditioned for 28 days. If the skin forms before tile placement, the polymer film at the surface blocks mechanical keying and the EN 1348:2007 value falls below 0.5 N/mm²; this failure is observed as adhesive transfer below 50 % to the tile back during field pull-off checks.
Specifying C1 alone over an underfloor heating screed introduces a regulatory conflict because ISO 13007-1:2014 class C1 does not include a deformability requirement, while heated screeds undergo thermal expansion cycles that can impose shear strain on the adhesive bed. For interior floors with cementitious heating screeds the adhesive should be specified as C1S1 or C2S1, not bare C1, unless the tile area is below 10 m² and movement joints are placed at every doorway. In the C1S1 variant, RDP dosage is raised to 4.0–6.0 wt% of total dry mix and the polymer type is selected for low-temperature flexibility with a glass transition temperature below -15 °C. The production batch is mixed in a twin-shaft compulsory mixer at 60–80 rpm for 240–300 s, with discharge temperature limited to 42 °C because higher temperatures can fuse the RDP and destroy the low-temperature flexibility required for S1 deformability. The terminal product is 600 x 600 x 9 mm ceramic tile over a calcium sulphate screed; the screed is heated and cooled according to EN 1264-4 before tiling, and the adhesive is applied at 6 mm bed thickness with an 8 mm notched trowel. The use of calcium aluminate cements in the same dry mix is not recommended without compatibility testing because the hydration pH profile differs from ordinary Portland cement and can change RDP coalescence timing. Published data for RDP-modified C1 adhesives under continuous thermal cycling from 0 °C to 45 °C on underfloor heating screeds is limited; performance is therefore confirmed by internal shear-strain testing rather than by a single EN 12004-1 classification value.
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Redispersible polymer powder designated RDP-C1/VAE for C1 grade tile adhesives is a spray-dried carboxylated vinyl acetate-ethylene copolymer with a polyvinyl alcohol protective colloid and a mineral anti-caking agent. The model designation RDP-C1/VAE is used as a specification class rather than a single manufacturer’s trade name. The powder is supplied as a white to off-white free-flowing material for dry-mix cementitious tile adhesives that must meet class C1 under EN 12004-1:2017 and ISO 13007-1:2014. A typical starting formulation contains 30–40 wt% Portland cement, 58–66 wt% graded silica or limestone sand, 0.3–0.5 wt% cellulose ether, and 2.0–4.0 wt% RDP-C1/VAE by total dry mortar mass. When the dry blend is wetted, the powder re-disperses into a polymer latex that coalesces within capillary pores and at the tile-adhesive interface. The coalesced film contributes to tensile adhesion strength, wet adhesion, and freeze-thaw resistance, and it reduces microcracking associated with unmodified cementitious bonding. Because class C1 requires tensile adhesion strength of ≥0.5 N/mm² after each specified conditioning regime, the polymer film must retain integrity after water immersion and heat ageing, not only after dry storage.
The carboxylated VAE chemistry is preferred over unmodified VAE because carboxyl groups provide ionic stabilization and improve wetting on dense tile backs. The polyvinyl alcohol protective colloid assists rapid re-dispersion in water; low-shear hand mixing can leave visible polymer agglomerates, so mechanical mixing is required. In cementitious systems, the polymer film forms during the drying phase after cement hydration begins. If the mortar dries too quickly, film coalescence may be incomplete and water immersion adhesion may fall below the required threshold. Open-time extension and water retention are therefore handled by cellulose ether, not by the polymer powder alone.
Class C1 denotes a normal cementitious adhesive; class C2 denotes an improved cementitious adhesive. Pull-off tensile adhesion is measured in accordance with EN 1348 using concrete substrates and ceramic tiles. The four conditioning regimes are dry storage, water immersion, heat ageing, and freeze-thaw cycling as defined in the standard method. A C1 adhesive must achieve ≥0.5 N/mm² after each regime; a C2 adhesive must achieve ≥1.0 N/mm². RDP-C1/VAE is designed around the lower C1 threshold, which allows cost-efficient polymer dosage but leaves little margin if water demand, filler surface area, or cement reactivity drift. Commercial RDP technical bulletins commonly identify water immersion adhesion as the controlling failure mode in C1 formulations; dry-storage adhesion may clear the threshold at lower polymer dosages than water immersion adhesion. For new formulation trials, the polymer dosage should be stepped at 2.0, 2.5, 3.0, and 3.5 wt% and tested under all four conditioning regimes before release.
| Adhesive class | Test method | Tensile adhesion strength required for each conditioning regime |
|---|---|---|
| C1 normal cementitious | EN 1348 | ≥0.5 N/mm² |
| C2 improved cementitious | EN 1348 | ≥1.0 N/mm² |
Optional designations such as slip resistance, extended open time, and fast setting are not implied by class C1 alone. If a product claims any of these, separate test methods apply. For C1 tile adhesives, the RDP contributes to wetting, cohesion, and film formation, whereas workability and open time are primarily controlled by cellulose ether and cement-filler ratios. Repeatedly adhesive failure at the tile interface during pull-off testing may indicate inadequate wetting or polymer film coverage, even if the numerical strength value passes. Plant trials should therefore include at least one batch at the lower dosage bound and one at the upper bound, because cement reactivity variation can shift the minimum polymer requirement.
Incoming quality control for RDP-C1/VAE at the dry-mortar plant can be structured around the specification classes shown in the following table. The values are typical ranges published in manufacturer datasheets for carboxylated VAE redispersible powders intended for C1 tile adhesives. Published data for a specific commercial equivalent should be obtained from the supplier’s certificate of analysis because minor deviations in ash content and particle size can change mortar water demand and mixer behavior.
| Parameter | Typical specification | Test designation |
|---|---|---|
| Non-volatile solid content | 98–100% | ISO 3251 |
| Ash content | 10–14 wt% | ISO 3451-1 |
| Apparent bulk density | 400–600 g/L | EN ISO 60 |
| Residual moisture | ≤2.0 wt% | ISO 787-2 |
| pH of redispersion | 6.0–9.0 | ISO 787-9 |
| Minimum film-forming temperature | 0–4 °C | ISO 2115 |
| Particle size retention | >95% <250 µm | ISO 13320 |
Storage and handling boundaries are determined by the powder’s hydrophilic character. Bags should be stored below 30 °C and 60% relative humidity; higher humidity can cause caking, loss of free-flow, and bridging in silo discharge. Pre-drying of sand to <0.5 wt% moisture is required when ambient relative humidity exceeds 60% or when hot weather increases aggregate moisture. The product is not a standalone binder; it requires cement and graded aggregate for strength development. Avoid direct contact with water before dry blending, and avoid mixing with high-pH liquid dispersions in which the protective colloid can coagulate. Ash content and MFFT should be monitored from lot to lot, with maximum expected variation of ±1 wt% ash and ±1 °C MFFT for stable tile adhesive performance. The ash content includes the mineral anti-caking agent and residues of the protective colloid; the anti-caking agent participates in the filler fraction and can slightly influence water demand at high dosage.
Dry mixing of RDP-C1/VAE in tile adhesive plants is performed in twin-shaft paddle, ribbon, or ploughshare mixers; free-fall drum mixers are unsuitable because the powder’s bulk density of 400–600 g/L is lower than cement and sand and can stratify. The addition sequence with sand first, cement second, RDP third, and cellulose ether last prevents low-density polymer powder from collecting on the mixer lid and reduces polymer-rich agglomerates. Dry blending time after the final ingredient is typically 3–5 min for a 2,000 kg batch. Shorter blending in plant trials can produce local under-concentration of polymer even when average dosage by mix calculation is correct, and this is detected as erratic tensile adhesion after water immersion. Wet mixing should be carried out with a mechanical paddle mixer, adding powder blend to water rather than water to powder. Mixing continues for 2–3 min until lump-free consistency is achieved. Flow table consistency can be measured by EN 1015-3; polymer-related air entrainment should be measured separately by EN 1015-7 if wet density variations are observed.
Loss-in-weight gravimetric hoppers should be calibrated for bulk density drift when switching between RDP suppliers or when silo residence time exceeds several weeks. RDP bridging in silos is a known production issue because the powder is low-density and free-flowing only within a narrow moisture range. Aeration pads or mechanical bin activators are used to maintain discharge in continuous mortar lines. In manual bagging operations, pre-mixing RDP-C1/VAE with fine sand at a 1:5 ratio can reduce dusting and improve distribution in small ribbon blenders. The polymer powder should not be added directly to hot cement from recent grinding operations above 60 °C, because heat can destabilize the protective colloid and reduce redispersibility.
RDP-C1/VAE is differentiated from styrene acrylic powders primarily by film hydrophilicity and wet adhesion development. Styrene acrylic powders can provide stronger early adhesion to low-porosity porcelain tiles, but they may require higher dosage or coalescing adjustment to pass the water immersion and freeze-thaw regimes required for C1. Ethylene-rich VAE powders with MFFT below 0 °C increase deformability and are more appropriate for S1 or S2 classified deformable adhesives; their softer films can depress tensile adhesion at low dosage and may not offer cost-efficient C1 compliance. Vinyl acetate homopolymer or vinyl acetate-ethylene-vinyl chloride terpolymer grades may offer lower raw material cost, but their low-temperature coalescence and water resistance are generally less favorable without additional formulation work. The specification discriminator for C1 remains MFFT 0–4 °C and ash content 10–14 wt%. Glass transition temperature of the redispersed film is useful as a secondary control but is less consistently reported than MFFT in commercial technical datasheets. Unlike liquid latex admixtures, RDP-C1/VAE is a dry powder that can be stored in one-component bags without biocides or freeze protection, which avoids dosage errors from evaporation and phase separation in the field.
Moving from C1 to C2 classification is not simply a matter of doubling polymer dosage. C2 requires ≥1.0 N/mm² after the same conditioning regimes, and large-format tile or low-porosity substrates often demand additional interfacial strength that may require a more efficient polymer grade or higher cement content. For deformable S1/S2 formulations, the polymer film must support transverse deformation under a different test method; RDP-C1/VAE is not automatically suitable for those classes. Compared with redispersible powders used in self-leveling underlayments or repair mortars, RDP-C1/VAE is optimized for wet adhesion to ceramic tile rather than for flexural strength enhancement or early compressive strength development.
In a tile adhesive plant, RDP-C1/VAE should be qualified by manufacturing a production-scale batch in the actual mixer and testing tensile adhesion per EN 1348 after all four conditioning regimes, not by laboratory hand mixing alone. The most sensitive discriminator is water immersion adhesion. If a formulation at 2.5 wt% polymer does not reach 0.5 N/mm² after water immersion, the adjustment sequence should first address cellulose ether grade, cement surface area, and aggregate fines, rather than simply increasing polymer dosage. Increasing RDP above 4.0 wt% tends to increase air entrainment, wet density variability, and material cost without proportional C1 strength gain. The product is not intended for formulations required to achieve class C2, deformable S1/S2, or continuous water immersion service; those applications require higher polymer dosage or different polymer chemistry and separate performance testing.
