| HS Code | 206908 |
| Chemical Base | Vinyl acetate ethylene (VAE) copolymer |
| Appearance | White free-flowing powder |
| Bulk Density | 400-600 g/L |
| Solids Content | >=98% |
| Ash Content | 10-15% |
| Ph 10 Aqueous Dispersion | 6-8 |
| Particle Size | 98% through 100 mesh |
| Minimum Film Formation Temperature | 0-5°C |
| Re Dispersibility | Fully re-dispersible in water to form stable emulsion |
| Tensile Adhesion Strength | >1.0 MPa (cementitious substrate) |
| Flexibility | High elongation at break, improves crack resistance |
| Water Resistance | Enhances wet adhesion and reduces water absorption |
| Storage Stability | Stable for 12 months in dry conditions when unopened |
As an accredited RDP for EIFS Finishing Coats factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RDP for EIFS Finishing Coats is packaged in 25 kg multi-layer paper bags with inner plastic lining for moisture protection. |
| Container Loading (20′ FCL) | 20' FCL loading: RDP in 25 kg bags, palletized, shrink-wrapped, net weight approx. 20 MT per container for EIFS finishing coats. |
| Shipping | RDP for EIFS Finishing Coats ships as a free-flowing white powder in moisture-proof bags, 25 kg each, palletized and wrapped. It is non-hazardous, requiring dry, ventilated conditions. Avoid exposure to rain or humidity. Standard container or truck transport is suitable, ensuring protected, upright stacking. |
| Storage | Store RDP in a cool, dry, well-ventilated area, away from moisture, direct sunlight, and heat sources. Keep containers tightly sealed to prevent moisture absorption and caking. Avoid excessive stacking that could damage packaging. Use within the recommended shelf life, typically 12 months from manufacture, while protecting from rain and condensation. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored unopened in cool, dry conditions. |
Vinyl acetate-ethylene (VAE) redispersible polymer powder intended for dry-mix EIFS finishing coats is pre-blended with fine quartz filler in a horizontal ribbon mixer operating at 25 rpm for 120 s before cement is charged. This sequencing prevents hydrophobic polymer particles from adhering to the mixer wall during dry blending. Production batches typically contain 2.5–4.5 wt% RDP on total dry mix, adjusted downward to 2.0 wt% when a separately added acrylic dispersion supplies part of the binder. The dry blend is stored in silos at relative humidity below 60%; exposure above this threshold causes powder agglomeration and non-uniform dispersion in continuous mixing units. The finished coat is trowelled to a wet film thickness of 1.5–3.0 mm over a cured glass-fibre mesh reinforced base coat. Hydraulic setting is controlled by calcium formate at 0.5–1.0 wt% when board surface temperatures fall below 10 °C. Declared performance under EN 998-1:2016 for external rendering and plastering mortars includes adhesive strength measured by EN 1015-12 after 28 d at 23 °C and 50% RH. On expanded polystyrene boards of 15–20 kg/m³ density, failure typically occurs cohesively within the insulation at 0.08–0.20 MPa. Water vapour permeability tested to EN 1015-21 remains in the range of 5–15 diffusion resistance coefficient. Published data for this specific configuration is limited for boards below 15 kg/m³, and on-site pull-off testing is required before specification.
For ETICS walls exposed to wind-driven rain in coastal zones, the finish coat is formulated with 2.5–3.5 wt% VAE/VeoVa RDP and an alkyl alkoxysilane water repellent at 0.3–0.8 wt% of dry mix. The silane is introduced into the wet mortar after the RDP has been dispersed in mixing water. Adding silane during dry blending causes premature hydrolysis and re-agglomeration of the polymer powder in vertical shaft mixers. Capillary water absorption is determined to EN 1015-18 after 24 h contact with water. System-level acceptance in EAD 040083-00-0404 for external thermal insulation composite systems with rendering typically requires water absorption below 0.5 kg/m² after 24 h. The floated surface is closed with a plastic trowel and tested for liquid water transmission according to EN 1062-3, targeting class W3. Overdosing the silane above 1.0 wt% reduces cleavage adhesion at the base coat interface below 0.15 MPa, even when the finish coat itself shows low water uptake. Zinc stearate is not used as a co-hydrophobic agent because it can concentrate at the base coat interface and block mechanical adhesion. The terminal product is a hydrophobic textured finish coat for coastal atmosphere categories C4–C5-M as described in ISO 12944-2.
| Finish coat configuration | RDP dosage (wt% of dry mix) | Capillary water absorption after 24 h per EN 1015-18 | Adhesive strength per EN 1015-12 |
|---|---|---|---|
| Trowel-applied EPS finish coat | 2.5–4.5 | 0.30–0.50 kg/m² | 0.08–0.20 MPa cohesive in EPS |
| Coastal hydrophobic finish coat | 2.5–3.5 | ≤0.50 kg/m² | >0.15 MPa interfacial |
| Mineral wool spray finish coat | 4.0–5.0 | 0.40–0.60 kg/m² | 0.05–0.10 MPa cohesive in board |
Mineral wool ETICS boards impose a lower modulus substrate with higher dimensional movement than EPS; spray-applied finish coats require a high yield stress to prevent sagging on vertical facades. The dry mix is batched with 4.0–5.0 wt% RDP and 0.05–0.12 wt% methyl hydroxyethyl cellulose to maintain open time and thixotropic recovery. Wet density is controlled between 1.45–1.60 kg/L with air entrainment below 8%. Spray application employs a worm pump delivering 400–600 L/h through a 6 mm nozzle at 0.8–1.2 bar air pressure. After spraying, the layer is hand-floated with a plastic trowel to embed the reinforcing mesh and close surface pores. The terminal product is a machine-applied finish coat with a surface profile of 1.5–2.0 mm. Adhesion to mineral wool substrate is measured by EN 1015-12 after 28 d; typical failure is cohesive within the mineral wool at 0.05–0.10 MPa when the board has been primed with a polymer-modified cement slurry. Pump shear above 200 s⁻¹ can reduce apparent viscosity below the sag resistance threshold if the cellulose ether dosage falls under 0.05 wt%. Batch-to-batch variance in RDP bulk density above ±5% alters powder feed calibration in continuous mixing units.
Field mixing water is metered to 0.18–0.22 L/kg dry mix. Below 0.18 L/kg, polymer film formation is incomplete at 5 °C and the cured finish coat shows microcracking at 3 d under dry northwest exposure. Above 0.22 L/kg, the wet film drains on warm mineral wool boards when board surface temperatures exceed 60 °C. The spray pump rotor/stator wear after 300 batch hours increases back-pressure and causes pulsation; this failure mode is monitored by pressure gauges at the gun inlet set to 1.0 bar. The finished render must remain below μ 20 water vapour diffusion resistance factor per EN 1015-21 to avoid interstitial condensation behind the mineral wool layer.
On dark-coloured EIFS finishes with total solar reflectance below 0.30, board surface temperature can exceed 80 °C in full sun. A VAE-based RDP with low free-film tensile strength holds quartz aggregate in the fired-texture matrix, but prolonged UV exposure causes chalking of the organic binder. Published accelerated weathering data for dry-mix RDP-based coloured EIFS finishing coats is limited; xenon-arc exposure to ISO 16474-2 is required before specification of saturated iron oxide pigment pastes. The finish coat formula contains 3.0–4.0 wt% RDP, 5–8 wt% inorganic pigment paste, and 0.3–0.5 wt% UV absorber dispersion based on total wet mix. The terminal layer is a quartz broadcast texture with aggregate size 0.8–1.4 mm for solar screening. At surface temperatures above 70 °C, the polymer film softens and surface tack increases; open time during installation is kept below 10 min to prevent premature skinning. Plastic trowel finishing after skin formation pulls quartz from the wet layer and leaves a patchy surface. If ambient RH exceeds 60%, the mixed mortar must be shaded and applied within 30 min because condensation on cold mix water accelerates skinning. Deep shades of black and charcoal can reduce surface hardness at cure temperatures above 40 °C because the polymer film coalesces too rapidly and entraps water vapour at the interface.
Plinth areas tested under EAD 040083-00-0404 impact categories require the finish coat to remain latently compatible with the reinforced base coat. RDP content is set at 3.5–4.5 wt% for standard impact category II installations at ground-floor corridors and entrance areas. The base coat is applied first, the 160 g/m² glass-fibre mesh is embedded, and the system cures for 24 h before the finish coat is trowelled in two passes to a total thickness of 3.0 mm. The terminal product is an impact-resistant decorative finish coat in high-traffic plinths. A single-pass application above 3.0 mm wet thickness produces surface cracking during the first freeze-thaw cycle because the polymer-cement matrix cannot dissipate strain uniformly. System-level freeze-thaw testing is conducted according to EAD 040083-00-0404 hygrothermal cycling.
Renovation of cracked existing mineral render with an RDP-modified EIFS finish coat begins with high-pressure washing at 150–200 bar and priming with a styrene-acrylate bonding agent. The dry-mix finish coat is formulated with 2.0–3.0 wt% RDP and 1.0 mm graded quartz to bridge hairlines in the existing render. It is applied manually to a maximum thickness of 2.0 mm per coat; thicker applications require a second pass only after the first has set for 12–24 h. Adhesion after 28 d is tested by EN 1015-12. If the existing painted or mineral surface has low cohesive strength, failure occurs below 0.10 MPa and the old coating must be mechanically removed. The terminal product is a renovation finish coat over pre-existing exterior render, used where full ETICS removal is not permitted by building preservation requirements. Data from production-scale renovation projects with unknown existing paint binder types is not sufficient; on-site pull-off testing is mandatory for painted substrates with unidentified binder type.
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RDP-FC 5044 N is a redispersible polymer powder based on a vinyl acetate-ethylene copolymer, produced by spray drying an aqueous polymer dispersion with a polyvinyl alcohol protective colloid and a controlled mineral anti-caking agent. The grade is specified for dry-mix EIFS finishing coats applied over reinforced base coats on exterior insulation and finish systems. The powder exhibits a glass transition temperature of -7 °C ± 2 °C when tested by ISO 11357-2, a minimum film formation temperature of 0 °C ± 2 °C by ISO 2115, and residual moisture below 1.5 wt% by ISO 3251. Bulk density is controlled within 450–550 g/L by ISO 60 to reduce compaction during silo storage and improve gravimetric dosing accuracy on continuous dry-mix lines. The recommended addition in a standard EIFS finishing-coat formulation is 3.0–4.0 wt% based on total dry mix.
In production-scale compounding, RDP-FC 5044 N is introduced into a single-shaft ribbon blender or twin-shaft ploughshare mixer after the cement, carbonate filler, and pigments have been dry-blended for 3 min. The sequencing reduces the formation of low-moisture polymer agglomerates that can survive final screening. A typical EIFS finish coat formulation contains 18–22 wt% white Portland cement, 40–55 wt% calcium carbonate or dolomite filler, 15–25 wt% graded silica sand, 3.0–4.0 wt% RDP, 0.3–0.5 wt% cellulose ether, and pigments. On a continuous dry-mix line with a 2000 L twin-shaft ploughshare mixer, batches containing 3.5 wt% RDP show a coefficient of variation for wet-mix viscosity of ± 8 % across ten consecutive batches when the powder is added after the fine filler. If the powder is added simultaneously with cellulose ether, viscosity variation increases to ± 18 % because of competition for water and local gelation. This order of addition is critical in silo-dosed plants.
The wet batch is mixed at the jobsite with a high-shear paddle mixer at 600–800 rpm for 3 min, rested for 5 min, and remixed for 1 min. This protocol produces a trowelable consistency with a flow of 160–180 mm when tested by EN 1015-3. The resulting viscosity recovery is sufficient to hold a wet-film thickness of 1.5–3.0 mm on vertical EPS and XPS base coats without sagging under normal thickness. Mixer amperage monitoring is recommended; a 2000 L horizontal mixer at 600 rpm typically draws 18–22 A during final dispersion. A drop below 15 A usually indicates insufficient hydration, an incorrect water dosage, or under-dispersion of the polymer powder.
The primary compositional distinction is a higher ethylene comonomer fraction and a controlled ash residue. The finishing-coat grade is designed for film formation at 0 °C without coalescent solvents and for early rain resistance after 24 h at 23 °C and 50 % RH. A general-purpose base-coat RDP at the same dosage may produce a harder film with lower elongation and higher water vapour diffusion resistance, which is acceptable beneath insulation but less able to accommodate thermal expansion of pigmented finish coats. The solubility of the polyvinyl alcohol protective colloid in alkaline cement water is also controlled; excessive water-soluble colloid at the finish surface increases early rain whitening and reduces tint retention. The powder is supplied as a free-flowing white to off-white powder. Redispersibility is retained after 12 months of storage at 20 °C in sealed bags, measured by the absence of visible grit when 50 g of powder is dispersed in 200 mL deionized water at 20 °C for 60 s at 1500 rpm.
| Property | Test method | Typical value |
|---|---|---|
| Glass transition temperature | ISO 11357-2 | -7 °C ± 2 °C |
| Minimum film formation temperature | ISO 2115 | 0 °C ± 2 °C |
| Ash content | ISO 3451-1 Method A | 10.5 % ± 1.5 % |
| Bulk density | ISO 60 | 450–550 g/L |
| Residual moisture | ISO 3251 | ≤ 1.5 wt% |
| pH of redispersed 10 % solids dispersion | ISO 976 | 7.0–8.5 |
Rheological response is non-Newtonian, with pronounced shear thinning under a paddle mixer at 600–800 rpm. After 3 min of high-shear dispersion, the Brookfield RV spindle 5 viscosity at 20 rpm and 23 °C typically returns to 30–60 Pa·s within 5 min of rest. This recovery is controlled by the redispersed colloidal particle size distribution and the anti-caking agent. Lower shear hand troweling maintains open time without stringiness, while rapid recovery after trowel passes holds aggregate suspension. Field failures on vertical south-facing walls have been traced to under-mixing at speeds below 300 rpm, which leaves visible polymer flocs in the wet film. Those flocs appear as translucent spots after rain and reduce local adhesion.
The powder is compatible with white Portland cement, calcium sulfoaluminate cement, calcium formate accelerators, and most melamine or polycarboxylate superplasticizers. It should not be blended with amine-based additives or zinc oxide at levels above 0.5 wt% because these can react with the polyvinyl alcohol stabilizer and cause premature gelation in the wet state. In highly alkaline cement slurries above pH 12.5, the vinyl acetate-ethylene polymer remains stable for at least 4 h, but prolonged mixing beyond 30 min at 40 °C can cause irreversible viscosity loss due to hydrolysis of the polyvinyl alcohol protective colloid.
Application onto a primed EIFS base coat proceeds by stainless-steel trowel or spray hopper, with a total wet-film thickness of 1.5–3.0 mm, typically built in two passes. The first pass is forced into the reinforcing mesh. The second pass is applied after the first has reached tack-free stage, usually 20–30 min at 23 °C and 50 % RH. The finish coat should not be applied when the substrate temperature is below 5 °C or when rain is expected within 24 h. At the lower addition limit of 3.0 wt%, the cured finish retains sufficient compressive strength but may show microcracking at movement joints. At the upper limit of 4.0 wt%, the finish coat remains flexible but becomes more sensitive to dirt pickup in areas with high aerosol traffic. Early rain resistance is normally achieved after 24 h of curing at 23 °C and 50 % RH; full physical properties are evaluated after 28 days by EN 1015-11.
At 5 °C, the polymer-rich finish must still form a continuous film. Because the minimum film formation temperature is 0 °C, the available thermal energy is sufficient, but evaporation is slowed by 30–40 % relative to 23 °C. In such conditions, the application thickness should be reduced to 1.5 mm per pass and the second pass delayed to 45–60 min. In a static crack-bridging assembly modeled after EN 1062-7, a 4.0 wt% addition can bridge a 0.5 mm notched substrate without visible cracking when the opening is maintained below 0.3 mm at 5 °C after 28 days of curing. At openings above 0.5 mm, the finish coat exhibits localized necking and pigment whitening. The system should not be used as a structural crack-bridging layer beyond this condition, because EIFS finish coats are expected to tolerate only microcracks in the underlying base coat, not structural movement.
Water vapour permeability is influenced by RDP dosage. At 3.5 wt%, the equivalent air-layer thickness Sd for a 2 mm dry film is typically between 0.05 m and 0.15 m when measured by EN ISO 7783, placing the finish coat in the high-permeability range required for moisture egress from the EIFS assembly. Liquid-water uptake after 24 h by EN 1062-3 is typically below 0.1 kg/(m²·h0.5). Above 5.0 wt% addition, hydrophobic film coalescence can increase water uptake by 0.03 kg/(m²·h0.5) due to microporosity. This non-linear behaviour is why dosage limits are strict.
| Property | Test method | RDP-FC 5044 N | General-purpose VAE RDP | Acrylic RDP |
|---|---|---|---|---|
| Tensile adhesion to XPS base coat at 23 °C, 28 d | EN 1015-12 | 0.55 MPa ± 0.05 | 0.45 MPa ± 0.05 | 0.40 MPa ± 0.06 |
| Liquid water uptake after 24 h | EN 1062-3 | 0.08 kg/(m²·h0.5) | 0.12 kg/(m²·h0.5) | 0.09 kg/(m²·h0.5) |
| Equivalent air-layer thickness Sd | EN ISO 7783 | 0.08 m | 0.12 m | 0.18 m |
| Static crack bridging at 5 °C | EN 1062-7 adapted | 0.30 mm | 0.15 mm | 0.25 mm |
Substitution of RDP-FC 5044 N for a general-purpose VAE powder without adjusting the cellulose ether dosage frequently produces higher wet-mix viscosity. When substituting into an existing formulation, the water demand should be reduced by 2–4 % and the cellulose ether content by 0.02–0.05 wt% to maintain the same EN 1015-3 flow. Failure to make this adjustment is a common cause of trowel drag and surface tearing on long elevations. The product is not formulated for immersion service or below-grade contact with hydrostatic water. For those conditions, a two-component reactive finish is required. Storage in unopened bags at 5–30 °C and relative humidity below 60 % is recommended. Above 60 % RH, pre-drying may be required if the powder is exposed for more than 4 h, because the anti-caking agent is hygroscopic and bulk resistivity decreases, promoting electrostatic agglomeration in screw feeders.
