| HS Code | 890554 |
| Polymer Type | Vinyl Acetate-Acrylate Copolymer |
| Appearance | White Free-Flowing Powder |
| Glass Transition Temperature | Approx. -5 to 5 °C |
| Minimum Film Formation Temperature | 0 to 5 °C |
| Particle Size | 80-120 mesh (typical) |
| Bulk Density | 400-600 g/L |
| Ash Content | 10-15% |
| Ph Value | 6.0-8.0 (as 10% dispersion) |
| Tensile Adhesion Strength | High, suitable for exterior cementitious systems |
| Elongation At Break | Moderate to high flexibility |
| Water Resistance | Excellent, improved resistance to water and weathering |
| Redispersibility | Forms stable, homogenous dispersion in water |
As an accredited Exterior Grade VAc-Acrylate RDP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Exterior Grade VAc-Acrylate RDP is supplied in 25 kg multilayer kraft bags with PE liner, palletized and shrink-wrapped for protection. |
| Container Loading (20′ FCL) | Exterior Grade VAc-Acrylate RDP loaded as 20′ FCL, palletized, shrink-wrapped, and moisture-protected to ensure safe, efficient transport. |
| Shipping | Exterior Grade VAc-Acrylate RDP is shipped as a dry powder in moisture-proof laminated bags on pallets, protected within ventilated, clean containers. Keep sealed, dry, and away from direct sunlight, heat, or rain during transit. Standard non-hazardous handling applies, with proper labeling and documentation for safe delivery. |
| Storage | Store Exterior Grade VAc-Acrylate RDP in a cool, dry, well-ventilated area, away from moisture, direct sunlight, and heat sources. Keep in original sealed packaging on pallets, avoiding compression or damage. Protect from rain and condensation. Once opened, reseal promptly. Under proper conditions, shelf life is typically six months from production date. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in original, unopened packaging in a cool, dry environment. |
In exterior ceramic tile installation on balconies, pool decks and ventilated facades, dry-mix mortars classified as C2TE S1 under EN 12004-2:2017 use a vinyl acetate–acrylate redispersible polymer powder at 2.0 wt% to 3.5 wt% of total dry mix to retain tensile adhesion after freeze-thaw cycling. Production-scale twin-shaft paddle mixers introduce shear heat when the main shaft runs at 220–280 rpm and the chopper at 1,800–2,500 rpm; powder temperature should remain below 45 °C to prevent coalesced granules from blocking the bagging valve and causing erratic dry-batch discharge. On low-absorption porcelain tile with water absorption <0.5%, the mixed wet mortar at water demand 7.5–8.5 L per 25 kg must maintain pot life of 2.5–4 h at 23 °C; field application with a notched trowel at 8 mm to 10 mm notch depth produces a ribbed mortar bed that must be collapsed by twisting the tile. After conditioning regimes specified in EN 12004-2:2017, adhesion values on fully vitrified porcelain after 25 freeze-thaw cycles between -15 °C and +20 °C remain above 1.0 MPa for C2 class. The polymer powder contributes to transverse deformation ≥2.5 mm under EN 12002 for S1 deformability by bridging the microcrack zone between cement hydrates and the tile-to-mortar interface; below this dosage, the failure mode shifts from cohesive failure in the mortar to adhesive failure at the tile rib crests. End product: a 25 kg valve-bag exterior tile adhesive with single-component mixing and extended open time for large-format cladding.
On externally insulated facades, the cementitious basecoat with embedded alkali-resistant glass-fibre mesh is governed by EAD 040083-00-0404 and ETAG 004 performance requirements; vinyl acetate–acrylate powder is dry-blended at 2.5 wt% to 4.5 wt% of total dry mix. High summer slab temperatures of 35–45 °C accelerate water evaporation and surface skinning at the trowel line, so the open time is limited less by cement hydration than by polymer film formation on the wet mortar surface before mesh embedment. Production site mixing with a 500–700 rpm paddle in 0.22–0.26 water-to-powder ratio produces a wet density of 1.55–1.75 kg/L; that density window is needed for full impregnation of 160 g/m² to 200 g/m² mesh without floating. When RDP content falls below 2.0 wt%, the basecoat shows mesh interface failure under diagonal tensile stress and direct pull-off adhesion to expanded polystyrene drops after water immersion; when dosage exceeds 5.0 wt%, early compressive strength development slows to below 3 MPa at 24 h, which is operationally problematic for on-schedule second-coat application. The film formed by VAc/Ac at MFFT close to 0 °C permits continued coalescence below 10 °C, but mixing water below 5 °C retards film fusion and should be avoided. End product: a 3–5 mm reinforced basecoat layer that anchors mineral finishing renders to EPS insulation under cyclic wind load and thermal movement.
Vertical spall repairs on chloride-exposed balcony slabs and stair landings under EN 1504-3 class R3 or R4 specifications incorporate vinyl acetate–acrylate redispersible polymer powder at 3.0 wt% to 5.0 wt% of dry mortar. The powder is introduced after the fine aggregate fraction and before the cement in a single-rotor vertical mixer with a stated batch capacity of 500 kg to 2,000 kg; in practice, batch-to-batch variation in polymer dispersion across zones within the mixer is observed when the chopper is worn, because the powder tends to accumulate on the static baffle unless the mixer is washed and re-conditioned. The mixed mortar at water-to-powder ratio 0.13–0.17 is applied by trowel onto saturated surface-dry concrete whose substrate strength is at least 1.5 MPa tensile; the wet layer thickness in a single pass must not exceed 40 mm to avoid thermal and drying gradients during polymer film coalescence. Under EN 12617-4, total shrinkage at 28 days in polymer-modified repair products is typically controlled by the combination of RDP film flexibility and cement type; published comparative data for all exact VAc/Ac grades is limited, but formulators generally specify hardened mortar capillary absorption below 0.3 kg/(m²·h⁰·⁵) to prevent chloride attack from de-icing salts. The cured polymer film bridges drying shrinkage microcracks up to 0.1 mm when the product is cured under polythene sheeting for 7 days; open-cure instead of moist-cure produces surface carbonation and reduces adhesive bond. End product: a trowel-grade structural patching mortar with lower modulus than unmodified repair concrete and improved crack control for horizontal and vertical reinstatement.
Below-grade tanking and balcony waterproofing slurries are formulated with a much higher polymer-cement ratio than mortar applications; vinyl acetate–acrylate RDP is added at 20 wt% to 35 wt% by cement mass. The resulting two-coat slurry is brush-applied in coats of 0.8–1.2 kg/m² per layer, with the second coat applied wet-on-wet after the first has lost surface tack but before full skinning, typically 30–60 minutes at 20 °C. The primary standard for the hardened membrane, EN 14891, requires evaluation under water pressure and crack-bridging after defined conditioning; VAc/Ac films with MFFT near 0 °C retain flexibility at -5 °C, which is critical for balcony membranes exposed to winter thermal shock. Excess water added by site crews to improve brushability dilutes the polymer dispersion and can reduce crack-bridging capacity by a measurable margin; membrane coating weight must be checked with a wet-film thickness gauge rather than relying on volume. In twin-shaft production of this powder, the high polymer loading creates dusting during bag filling unless the silo venting and suction hood are sized for powder bulk density of 500–700 kg/m³. The cured membrane is typically reinforced with a nonwoven polyester fleece in internal corners and can withstand prolonged immersion if the final dry film thickness reaches 1.5–2.0 mm; below this thickness, pinholes at sharp re-entrant angles remain the primary source of leak tests failure.
| Application | Primary standard | Key test parameter | Typical addition |
|---|---|---|---|
| Exterior porcelain tile adhesive | EN 12004-2:2017 | Tensile adhesion after freeze-thaw | 2.0–3.5 wt% |
| ETICS cementitious basecoat | EAD 040083-00-0404 | Direct pull-off adhesion to EPS | 2.5–4.5 wt% |
| Concrete repair mortar | EN 1504-3 | Chloride penetration / capillary absorption | 3.0–5.0 wt% |
| Flexible waterproofing slurry | EN 14891 | Crack bridging at low temperature | 20–35 wt% by cement mass |
| Decorative exterior render | EN 998-1 | Capillary water absorption category W2 | 2.0–6.0 wt% |
| Wide-joint paving grout | EN 13888 | Flexural strength / water absorption | 2.0–3.5 wt% |
Exterior render formulations under EN 998-1 using a VAc/Acrylate powder at 2.0 wt% to 6.0 wt% of dry mix produce a mortar-like finish with low-organic content but with capillary water absorption category W2. The powder is added early in the dry-mix sequence with iron oxide pigments to prevent pigment streaking; a 300–500 kg single-shaft mixer with a fine powder pre-blend at 120–150 rpm achieves uniform dispersion in 10–15 minutes, but longer mixing at higher speeds can generate static charge and cause pigment to segregate in the bag. The fresh render is applied by stainless-steel trowel at 2–4 mm thickness in a single pass; overworking the surface after the initial skin formation, which at 25 °C and 55% relative humidity occurs within 10–15 minutes, disrupts the continuous polymer film and produces visual streaking after rain. The hardened render must be tooled while wet to avoid microcracking around window openings; VAc/Acrylate film suppresses efflorescence by reducing the capillary suction path, but it cannot compensate for cement-rich formulations above 1:2.5 binder-to-sand ratio. End product: a solvent-free pigmented facade finish with reduced water uptake and improved long-term colour retention on exposed southern elevations.
Joint movement in exterior paving installations with porcelain or natural stone tiles is accommodated by cementitious grouts classified under EN 13888; vinyl acetate–acrylate RDP at 2.0 wt% to 3.5 wt% of total dry grout improves flexural strength and reduces water migration into the grout joint. Wide joints above 5 mm are filled with a trowel-press technique; the grout is mixed to a stiff slump, left to slake for 3–5 minutes, and then pressed diagonally into the joint with a hard rubber squeegee to prevent air pockets at the tile edge. The polymer film reduces the elastic modulus of the cured grout from typical unmodified values of 25–30 GPa toward the lower range of 18–24 GPa, which allows slight joint relaxation under thermal expansion without total adhesive failure; the exact modulus depends on curing moisture. Cleanup water must be minimised because early surface washing removes polymer-rich fines and produces low-strength grout surfaces that powder off after traffic. End product: a single-component pigmented grout mixed on site for exterior paving joints where freeze-thaw cycles and deicing salts require reduced water ingress.
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Exterior Grade VAc-Acrylate RDP is a water-redispersible polymer powder produced by spray-drying a vinyl acetate-acrylate copolymer dispersion stabilised with a polyvinyl alcohol protective colloid and an inert mineral anticaking agent. The powder is formulated for cementitious dry-mix mortars requiring exterior exposure resistance, low water uptake, and stable adhesion to concrete, EPS board, and ceramic tile. Commercial model designations are manufacturer-specific alphanumeric codes that typically encode nominal glass transition temperature and protective colloid type; the data in this profile correspond to a generic exterior-grade VAc-acrylate RDP with a nominal glass transition temperature of 0 °C. Physical specifications routinely reported on certificates of analysis are summarised in Table 1.
| Property | Test method | Typical range or value |
|---|---|---|
| Solids content | ISO 3251 | 98–100 % |
| Ash content | ISO 3451-1, 800 °C | 9–13 % |
| Bulk density | DIN EN 543 | 400–550 g/L |
| Residue on 125 µm sieve | ISO 2591-1 | ≤ 2 % |
| pH of 20 % redispersion | ISO 976 | 7.0–9.0 |
| Minimum film-forming temperature | ISO 2115:2000 | 0–4 °C |
| Glass transition temperature | ISO 11357-2:2020 | -5 to +5 °C |
| Redispersed particle size D50 | ISO 13320-1:2020 | 1.0–3.0 µm |
Because the powder is supplied at 98–100 % solids per ISO 3251, dosing accuracy in automated dry-mix plants is controlled by gravimetric feeders with a tolerance of ±0.2 % of total batch weight. Storage in unopened bags below 30 °C and relative humidity below 60 % is required to prevent caking; under high-humidity logistics, pre-drying or warehouse dehumidification is recommended because the protective colloid is hygroscopic. Shelf life is commonly specified as 6–12 months from date of manufacture, after which redispersibility should be re-verified by measuring sieve residue per ISO 2591-1 and redispersed particle size per ISO 13320-1:2020.
High-shear dispersion of 100 g powder in 400 g water in a laboratory disperser at 2000 rpm for 2 min should produce a homogeneous dispersion free of visible grit. If sieve residue exceeds 2 %, redispersion in the field may generate surface defects in thin-bed tile adhesive joints and render coat voids. In dry-mix production, pre-blending the powder with fine aggregates below 0.5 mm before cement addition reduces polymer enrichment and improves uniformity on horizontal ribbon blenders.
Relative to vinyl acetate-ethylene RDP, exterior-grade VAc-acrylate RDP contains acrylate comonomer instead of ethylene-derived soft segments. This compositional difference produces a cured film with higher tensile strength but lower elongation; it also improves resistance to saponification in alkaline cement pore water. At a 3.0 wt% addition in a C2 tile adhesive, the VAc-acrylate grade often requires 5–10 % less mixing water to reach a flowable consistency of 150 mm by EN 1015-3, compared with VAE grades. Relative to pure acrylic RDP, the vinyl acetate fraction improves wetting of cement grains and reduces raw-material cost, while long-term UV stability and water resistance of the film remain lower. The comparison in Table 2 is compiled from commercial technical data sheets and is formulation-dependent.
| Property | Test method | VAc-Acrylate RDP | VAc-Ethylene RDP | Acrylic RDP |
|---|---|---|---|---|
| Glass transition temperature | ISO 11357-2 | -5 to +5 °C | -10 to +5 °C | -15 to +5 °C |
| Minimum film-forming temperature | ISO 2115 | 0–4 °C | 0–5 °C | 0–6 °C |
| Free film water uptake, 24 h immersion | ASTM D570-22 | 18–25 % | 25–40 % | 10–18 % |
| Free film tensile strength | ISO 527-2 | 5–8 MPa | 3–6 MPa | 6–10 MPa |
| Elongation at break | ISO 527-2 | 200–400 % | 300–600 % | 200–500 % |
| Tile adhesive adhesion, 28 days | EN 1348 | 0.8–1.2 MPa | 0.7–1.0 MPa | 1.0–1.5 MPa |
The quantitative ranges in Table 2 should not be treated as universal specifications, because redispersible polymer powder performance shifts with protective colloid type, cement grade, water/cement ratio, and addition level. Published data for specific configurations is limited where non-standard curing or alternative cement types are used.
At 2.0 wt% addition in a C2TE-class ceramic tile adhesive, initial tensile adhesion measured per EN 1348 after 28 days standard cure typically falls between 0.8 MPa and 1.0 MPa, while compressive strength per EN 196-1 remains 38–42 MPa. Increasing the VAc-acrylate RDP dose to 3.5 wt% raises adhesion to 1.1–1.4 MPa but lowers compressive strength to 32–37 MPa; open time measured according to EN 12004-1 extends from approximately 20 min to 30 min. At 4.0 wt% and above, wet mortar viscosity at 23 °C can increase by 100–200 Pa·s relative to the 3.0 wt% dose, requiring either an increase in mixing water of 0.5–1.0 wt% or the use of a polycarboxylate superplasticizer to maintain workability. Production-scale horizontal ploughshare mixers with tip speeds of 15–20 m/s often require an additional 20–30 s of dry mixing at the higher dose to eliminate hydrophobic polymer lumps. Because the processing window narrows at this boundary, addition levels are usually maintained within ±0.2 wt% of the qualified formulation.
For exterior tile adhesive on concrete balconies, the substrate is primed with an acrylic or VAc-acrylate liquid primer at 0.1–0.2 L/m² before notched trowel application. Open time is assessed by placing 50 mm × 50 mm tiles at 5 min, 10 min, 20 min, and 30 min intervals then testing adhesion per EN 1348. The method is more sensitive to polymer type than a simple slump test, and field failure modes at the 20 min interval are typically cohesive within the adhesive rather than adhesive at the substrate.
Alkaline hydrolysis in cementitious matrices is governed by the acrylate comonomer fraction and the protective colloid system. A free film obtained from a mortar containing 3.0 wt% Exterior Grade VAc-Acrylate RDP is conditioned in saturated Ca(OH)₂ solution at 23 °C for 14 days. Tensile strength retention measured on a universal testing machine with a 1 kN load cell and crosshead speed of 50 mm/min is typically above 80 % relative to the unconditioned film per ISO 527-2. Vinyl acetate homopolymer films, by contrast, undergo more severe strength loss under the same alkaline exposure. The improvement is not unlimited: prolonged immersion in hot 1 M NaOH at temperatures above 40 °C still produces measurable hydrolysis, and formulators should not rely solely on VAc-acrylate RDP for chemically aggressive effluent contact.
Mortars modified with 2.5–3.5 wt% Exterior Grade VAc-Acrylate RDP are subjected to rapid freeze-thaw cycling per ASTM C666/C666M-15 Procedure A. A properly air-entrained base coat with 15–25 % air content in the fresh state and a hardened air-void spacing factor below 0.25 mm retains at least 80 % of its initial dynamic modulus after 150 cycles. The polymer film bridges microcracks that form during the first 20 cycles; without the polymer, comparable mixes show relative dynamic modulus loss of 20–40 % by 100 cycles. If the dry mortar is mixed with water at below 10 °C, film coalescence is delayed and freeze-thaw performance can drop markedly; mixing water at 15–20 °C is recommended for exterior application. Accelerated UV testing per ASTM G154-23 for 1000 h reveals moderate yellowing in unmodified vinyl acetate films, whereas the VAc-acrylate exterior grade shows a ΔE change below 3.0 measured per ISO 11664-4.
For waterproofing slurries tested under EN 14891:2017, a polymer-to-cement ratio of 0.30–0.50 is typically required to achieve crack-bridging capacity of 0.5–1.0 mm at 23 °C without increasing the dry film water absorption above 10 % by mass after 24 h immersion per ASTM D570-22. The VAc-acrylate powder is dry-blended with cement, silica sand, and calcium formate accelerator; the mix is then dispersed with a slow-running paddle mixer at 300–600 rpm for 3 min, rested for 5 min, and remixed for 30 s. Field experience on continuous dry-mix lines shows that powder flowability and metering consistency decline if the product is stored above 35 °C or if bagged product is stacked more than 3 pallets high, which can compact the powder and increase tap density by 5–10 %.
In exterior renders conforming to EN 998-1 and repair mortars conforming to EN 1504-3, the product is used at addition levels of 2.0–4.0 wt% of dry mortar. Mix designs for ETICS base coats typically contain 20–25 wt% ordinary Portland cement CEM I 42.5 R, 0–5 wt% hydrated lime, 0.5–1.0 wt% cellulose ether, 0.2–0.5 wt% starch ether, and 2.5–3.5 wt% VAc-acrylate RDP. The cured render is assessed for capillary water absorption after 24 h per EN 1062-3; formulations containing 3.0 wt% VAc-acrylate RDP typically show water absorption coefficients below 0.1 kg/(m²·h⁰·⁵), depending on cement content and hydrophobic admixtures. Adhesion after 7 days at 23 °C and 50 % relative humidity is measured by EN 1015-12; values above 0.3 MPa are commonly recorded on concrete substrates. Because exterior renders are exposed to solar UV and rain entrainment, the VAc-acrylate grade is preferred over unmodified vinyl acetate homopolymer powders where film cohesion and reduced surface dusting are required.
When site-mixed applications are executed below 5 °C or above 80 % relative humidity, the film formation window changes because the minimum film-forming temperature of the redispersed polymer is 0–4 °C. At low temperature, the polymer particles remain in the glassy state and cannot coalesce, which reduces adhesion after 24 h by up to 30 % compared with standard cure at 23 °C. Site experience on exterior ETICS base coats shows that mixing water at 15–20 °C and substrate temperature above 5 °C are required for the film to reach a measurable adhesion increment by 24 h.
