| HS Code | 219068 |
| Product Name | VA&VeoVa Copolymer RDP |
| Chemical Composition | Vinyl Acetate-Vinyl Ester of Versatic Acid Copolymer |
| Physical State | Free-flowing white powder |
| Particle Size | 80-120 µm (typical) |
| Bulk Density | 400-600 g/L |
| Active Polymer Content | 99-100% (dry polymer) |
| Protective Colloid | Polyvinyl alcohol (PVOH) |
| Minimum Film Forming Temperature Mfft | 0-5 °C |
| Glass Transition Temperature Tg | 0-10 °C |
| Ph Of Rewaterized Dispersion | 6.0-8.0 |
| Film Appearance | Transparent, flexible, and water-resistant upon drying |
| Solubility | Redispersible in water to form stable emulsion |
| Water Resistance | Good (improved by VeoVa monomer content) |
| Adhesion | Excellent to cement, gypsum, wood, and various substrates |
| Storage Stability | Stable for 12 months when stored in dry, cool conditions |
As an accredited VA&VeoVa Copolymer RDP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | VA/VeoVa copolymer RDP is packaged in 25 kg multi-layer paper bags with an inner polyethylene liner for protection. |
| Container Loading (20′ FCL) | 20′ FCL: VA/VeoVa Copolymer RDP packed in moisture-proof bags on pallets, loaded and secured for safe transport. |
| Shipping | VA&VeoVa Copolymer RDP is a free-flowing white powder supplied in moisture-proof multi-layer paper bags with PE liners, typically 25 kg each. It ships as non-hazardous material. Protect from moisture and humidity during transit; keep cool, dry, and well-ventilated to preserve polymer performance. |
| Storage | Store VA&VeoVa Copolymer RDP in a cool, dry, well-ventilated area, away from direct sunlight and heat sources. Keep the original sealed packaging intact to protect the powder from moisture and humidity. Avoid compression or damage to bags during stacking. Under proper conditions, shelf life typically extends 6–12 months from manufacture. |
| Shelf Life | Shelf life is typically 12 months from production when stored unopened in a cool, dry place. |
Cementitious tile adhesives classified as C1 or C2 under EN 12004-2 represent the highest-volume downstream segment for VA/VeoVa RDP. The dry powder is preblended with Portland cement, silica sand and cellulose ether in forced-action pan mixers, with product temperature maintained below 40 °C and residual moisture below 1.0 wt% to prevent film blocking in screw conveyors and bucket elevators. The dosage range for VA/VeoVa RDP in standard thin-bed adhesives falls between 1.5 wt% and 4.0 wt% of total dry-mix mass; below 1.0 wt%, the wet adhesion after 21 days water immersion typically fails the 0.5 N/mm² threshold required for C1 under EN 12004-2. Initial tensile adhesion is measured according to EN 1348 on concrete substrate after 28 days dry storage. Above 4.0 wt%, the additional polymer phase reduces compressive strength and can interfere with early cement hydration because the polyvinyl alcohol protective colloid retards hydration at the interfacial zone. The vinyl versatate comonomer contributes steric hindrance around the ester bond, which gives the polymer film higher saponification resistance than unmodified vinyl acetate copolymers and translates into more stable adhesion under prolonged water exposure. Production-scale failure modes include static agglomeration in storage silos when polymer powder is added directly to wet sand, and uneven redispersion in free-fall mixers that lack high-shear tooling. The polymer phase coalesces after the cement begins to hydrate and water is consumed, forming a continuous film that bridges microcracks and reduces water absorption at the tile-mortar interface. Open time is extended because the redispersed latex slows evaporation from the mortar surface; the effect is measurable by the extended open time classification C2E under EN 12004-2, which requires a tensile adhesion strength of at least 0.5 N/mm² after 30 min of open time. Horizontal plowshare mixers with high-speed choppers achieve more uniform polymer distribution than ribbon blenders, reducing batch-to-batch variance in thin-bed adhesion tests.
| Classification | Test condition | Minimum tensile adhesion strength | Typical VA/VeoVa RDP dosage |
|---|---|---|---|
| C1 | 28-day dry conditioning | 0.5 N/mm² | 1.5–2.5 wt% |
| C2 | 21-day water immersion | 1.0 N/mm² | 2.5–4.0 wt% |
| C2E | 30 min open time | 0.5 N/mm² | 3.0–4.0 wt% |
In external thermal insulation composite systems, the base coat must reconcile two conflicting demands: low water absorption and high water-vapour diffusion. VA/VeoVa RDP is dry-blended with cement, hydrated lime, graded limestone or quartz filler, cellulose ether and short polypropylene fibres at dosage rates of 3.0–6.0 wt% of the dry mix. The resulting mortar is applied by trowel or spray over expanded polystyrene or mineral wool boards, and the alkali-resistant glass-fibre mesh is embedded before the initial skin forms. Compared with styrene-acrylic RDP, VA/VeoVa develops lower capillary uptake after film coalescence because the branched versatate ester reduces water penetration into the polymer-cement matrix; this behaviour is evaluated under the capillary absorption procedure referenced in EAD 040083-00-0404. Typical base coats achieve values below 0.5 kg/m² after 24 h when the polymer dosage is above 3.0 wt%. The polymer film also increases stress transfer between the glass-fibre mesh and the cementitious matrix, which changes the impact response of the system in the falling-ball test. Published data for the exact impact classification of a specific VA/VeoVa formulation is limited because the result is determined by the full system, not by the base coat polymer alone. On production lines, the main bottleneck is premature skinning when the mortar is sprayed at ambient temperatures above 35 °C; the open time can shorten to less than 15 min, making mesh embedding difficult. A formulation with 3.0 wt% VA/VeoVa and 0.3 wt% cellulose ether typically exhibits an air content below 3.0 vol% after mixing at 600 rpm, but air content above 5.0 vol% reduces pull-off resistance on EPS below the contractual minimum. The use of a low-shear helical mixer rather than a high-shear colloidal mixer reduces air entrainment in field batches and improves uniformity of the mesh embedment layer.
Substitution of casein in self-leveling underlayments targeting EN 13813 class CT-C25-F6 changes the rheological design space. Typical VA/VeoVa RDP content in these systems is 2.0–5.0 wt% of total powder, with the polymer acting primarily as a film-forming binder that reduces surface dusting and increases tensile adhesion to the substrate. The water demand of a calcium aluminate cement-ordinary Portland cement blend is not reduced by VA/VeoVa to the same extent as by casein; therefore, replacement requires adjustment of the polycarboxylate ether superplasticizer dosage, usually within 0.1–0.3 wt% of powder, and the incorporation of a powdered defoamer to control pinholes. Flow behaviour is measured according to EN 12706 with a flow cone; VA/VeoVa-modified formulations are adjusted to a spread of 240–260 mm at a water-to-powder ratio of 0.22–0.26. Below 2.0 wt% polymer, the underlayment exhibits excessive segregation at the target flow, and the surface tensile strength after 28 days can fall below 1.0 N/mm² as measured with a pull-off tester. Above 5.0 wt%, the polymer delays setting by encapsulating cement grains and reduces early strength development, which may prevent the 25 MPa compressive strength threshold required for class CT-C25 from being reached at 28 days. On continuous mixing pumps, the pot life of a VA/VeoVa-modified self-leveling compound is shorter than a casein-modified batch because the redispersed polymer raises viscosity; this limits practical pump distance to approximately 30 m before pin rake and spiked roller finishing is no longer feasible. The powder is blended into the cement-filler mixture before liquid addition because direct wet addition causes lumping and polymer-rich streaks that remain visible after the surface has hardened.
Two-component flexible cementitious slurries achieve crack-bridging behaviour only after the polymer phase has coalesced into a continuous film. VA/VeoVa RDP is used in one-component polymer-modified slurries at dosage rates between 15 wt% and 30 wt% of the dry mix, which is substantially higher than in tile adhesives because the cured membrane must remain flexible enough to bridge substrate cracks. The low minimum film formation temperature of VA/VeoVa copolymers, typically in the range of 0 °C to 5 °C, permits application at substrate temperatures above 10 °C without additional coalescing solvent; this is a practical advantage over styrene-acrylic powders with higher MFFT. Crack-bridging capacity is assessed under EN 14891 by cycling a coated crack across a defined opening. Published numerical crack-bridge values for individual VA/VeoVa formulations vary with the filler-binder ratio and the application thickness; the standard does not prescribe a single universal value for all classification levels. A 2.0 mm dry film thickness is commonly specified for horizontal surfaces, while vertical surfaces may require 3.0 mm applied in two lifts to reduce sagging. The main field failure occurs when the slurry is over-diluted with water to extend open time; this reduces polymer concentration below the coalescence threshold and causes pinholes and reduced crack bridging. Mixing with a slow-speed drill at 400–600 rpm for 3 min followed by a 5 min maturation period is required to achieve full redispersion without excessive air entrainment. At dosages above 30 wt%, the cured membrane may show reduced resistance to standing water because the continuous polymer phase becomes more sensitive to plasticisation by retained water.
For cementitious tile grouts exposed to intermittent water contact, VA/VeoVa RDP dosage rarely exceeds 2.0 wt% of the dry blend. At this level the polymer reduces water absorption after 30 min and 4 h when tested under EN 12808-5 without closing the joint to water-vapour diffusion. Higher additions increase stickiness during float application and can cause pigment flooding on the tile surface; production-scale experience shows that a dosage of 0.5–1.0 wt% is adequate for interior wall grouts, while 1.0–2.0 wt% is reserved for exterior floor grouts requiring improved freeze-thaw resistance under ISO 13007-4.
In gypsum-based joint compounds prepared on continuous kneading lines, VA/VeoVa RDP is dry-blended with calcium sulfate hemihydrate, fine limestone filler and starch before water addition. The polymer dosage in these systems is normally 1.0–3.0 wt%; this range improves adhesion to paper tape when evaluated under ASTM C475 while retaining the sandability required for hand finishing. The polyvinyl alcohol protective colloid retards hydration at the hemihydrate surface, so the set time must be restored with ground gypsum accelerators, typically 0.05–0.15 wt% of plaster mass. Field issues arise when the powder is added after the wetting phase because the polymer clumps and creates hard particles in the dried film.
Polymer-modified repair mortars specified under EN 1504-3 class R3 demand a controlled modulus differential between the repair layer and the concrete substrate. VA/VeoVa RDP is incorporated at 2.0–5.0 wt% into cement-sand-graded aggregate repair blends to increase flexural strength while reducing the elastic modulus of the cured matrix; the resulting layer accommodates differential shrinkage without reducing compressive strength below the class R3 threshold of 25 MPa. Pull-off adhesion is measured according to EN 1542 on a roughened concrete substrate, and VA/VeoVa-modified R3 mortars are typically formulated to exceed 2.0 MPa, although the exact value depends on substrate preparation and curing. Drying shrinkage is evaluated under EN 12617-4; polymer additions above 5.0 wt% can increase the shrinkage of the repair layer due to the lower solid content of the polymer film, while additions below 2.0 wt% do not produce measurable crack resistance. The powder must be blended before the coarse aggregate to prevent static charge-induced segregation in ribbon blenders and to avoid polymer-rich pockets that form rubbery inclusions after curing.
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VA&VeoVa Copolymer RDP is a redispersible polymer powder based on a vinyl acetate–vinyl ester of versatic acid copolymer. The powder is produced by emulsion copolymerization, stabilized with polyvinyl alcohol, and converted to a dry powder by co-current or mixed-flow spray drying with rotary atomization at inlet air temperatures of 120–160 °C and outlet air temperatures of 55–75 °C. The base copolymer contains 10–40 wt% of a branched tertiary carbon-bearing VeoVa ester, which introduces steric hindrance against alkaline hydrolysis in cementitious matrices. Commercial models are differentiated by nominal minimum film-forming temperature, ash content, and hydrophobic post-treatment; a low-Tg grade may show an MFFT of 0 °C per ISO 2115, while a medium-Tg tile-adhesive grade falls at 8–12 °C. Residual moisture is controlled to ≤1.5 wt% after 2 h at 105 °C, and ash content after 2 h at 1000 °C per ISO 3451-1 is typically 9–14 wt%. The powder must be kept in sealed bags below 30 °C and below 65% RH; once opened, the material should be consumed before moisture uptake exceeds 1.0 wt% as measured by ISO 15512.
Re-dispersion in mixing water is governed by the polyvinyl alcohol protective colloid, the mineral anti-caking layer, and residual moisture. Primary latex particles of 0.1–2.0 µm are agglomerated into secondary particles with a median diameter of 70–90 µm when measured by laser diffraction per ISO 13320. Under typical mortar mixing shear of 500–1000 rpm in a high-shear disperser, the protective colloid begins to dissolve and releases primary polymer particles; complete dispersion, assessed visually as the absence of polymer flakes on a 315 µm sieve, requires 60–120 s at water temperatures between 15 °C and 30 °C. In cementitious tile adhesives, the redispersed particles deposit onto cement hydration products and aggregate surfaces. Film coalescence occurs later, as water is consumed by hydration and substrate absorption. The colloidal stability of the redispersion is sensitive to the Ca²⁺ and Al³⁺ concentration in the cement pore solution. Grades with low polyvinyl alcohol content, below 8 wt% based on polymer solids, may show delayed re-dispersion or microflocculation in high-alkali pore solution. The resulting film quality is then reflected in the tensile adhesion strength measured by EN 1348 after 28 days of standard curing.
For C2-class cementitious tile adhesives, VA&VeoVa Copolymer RDP is added at 2.0–4.0 wt% of total dry mortar. At 3.0 wt%, adhesion after water immersion per EN 1348 can exceed 1.0 N/mm², but the value depends on cement type, water-to-solids ratio, and substrate porosity. Heat-age adhesion after 14 days at 70 °C is more discriminating than standard-condition adhesion; higher VeoVa content tends to retain 70–85% of the reference pull-off value, whereas vinyl acetate homopolymer powders often fall below 50%. These tests use a 6 mm × 6 mm notched trowel and a pull-off tester with a loading rate of 250 ± 50 N/s per EN 1348. Deformability is evaluated separately by EN 12002; an S1 adhesive requires transverse deformation of ≥2.5 mm, and an S2 adhesive requires ≥5.0 mm. A low-Tg VA/VeoVa grade at 4.0 wt% can support S1 deformation on standard tiles, but published data for this specific configuration is limited, and screening on the actual tile type is required before production. Extended open time is quantified by EN 1346; a C2 formulation containing 3.0 wt% of a medium-Tg VA/VeoVa grade may retain 0.7–0.9 N/mm² after a 30 min open time on a low-absorption tile with a 6 mm notched trowel. The open time is reduced below 20 min at air temperatures above 30 °C or wind speeds above 2 m/s, because the surface skin forms before tile embedding.
In exterior thermal insulation composite systems, the base coat formulation containing 2.5–4.0 wt% of a hydrophobic VA/VeoVa grade must balance impact resistance, water absorption, and crack-bridging. Accelerated weathering and impact tests are conducted under EAD 040083-00-0404; the base coat is applied over expanded polystyrene boards with a 3 mm notched trowel and embedded glass-fibre mesh. The polymer reduces the modulus of the base coat and improves the bond to the insulation board. A formulation with 3.0 wt% polymer and a water-to-cement ratio of 0.45 typically shows a water absorption coefficient below 0.5 kg/m²·h¹⁄² when tested per EN 1015-18, provided the hydrophobic grade is used and the coat is cured for 28 days at 23 °C and 50% RH.
In wet cementitious environments, the vinyl acetate segments of the copolymer are exposed to hydroxyl ions at pH values above 12.5. The VeoVa ester contains a branched tertiary carbon structure that sterically shields the ester carbonyl from nucleophilic attack. This is the principal difference from vinyl acetate–ethylene copolymers, which rely on ethylene for internal plasticization but provide less steric hindrance at the acetate linkage. The practical consequence is that VA/VeoVa grades often retain a larger fraction of their original tensile adhesion strength after prolonged water immersion, as measured by EN 1348 after 21 days immersion at 20 °C followed by 24 h drying. Direct kinetic data on alkaline hydrolysis in synthetic pore solution are limited; formulators therefore compare grades by wet-adhesion retention and by water impermeability after immersion per EN 14891.
| Parameter | VA/VeoVa RDP | VAc/E RDP | Acrylic RDP |
|---|---|---|---|
| Primary hydrophobic monomer | Branched C9–C11 vinyl ester | Ethylene | Acrylate/methacrylate ester |
| Typical MFFT range | 0–12 °C | 0–4 °C | 0–15 °C |
| Alkaline hydrolysis resistance | High | Moderate | High |
| Water uptake at 23 °C and 85% RH | Low to moderate | Moderate | Low |
| Typical dosage in C2 tile adhesive | 2.0–4.0 wt% | 3.0–5.0 wt% | 2.0–4.0 wt% |
These differences are not absolute. A high-ethylene VAc/E grade can approach the low-temperature flexibility of a low-Tg VA/VeoVa grade, and an acrylic grade can exceed both in UV stability, but at higher cost and with different wetting behaviour on cement surfaces. The choice is made by running comparative mixes in a 5 L planetary mortar mixer and testing the cured mortar per EN 1348 and EN 12002, rather than from nominal chemical composition alone.
Commercially available VA&VeoVa Copolymer RDP grades share a common specification envelope, but the active polymer content must be corrected for ash and moisture. The following ranges are representative of multiple technical data sheets for this chemistry; individual batches should be checked against the certificate of analysis before production.
| Property | Test method | Typical range |
|---|---|---|
| Residual moisture | ISO 15512 | ≤1.5 wt% |
| Ash content | ISO 3451-1 | 9–14 wt% |
| Apparent bulk density | ISO 60 | 400–600 g/L |
| Median particle size d50 | ISO 13320 | 70–90 µm |
| pH of 20% redispersion | ISO 976 | 6.5–8.5 |
| Minimum film-forming temperature | ISO 2115 | 0–12 °C |
| Glass transition temperature | ISO 11357-2 | -5–15 °C |
For a powder with 12 wt% ash and 1.5 wt% moisture, the polymer-active fraction is approximately 86.5 wt%. This correction must be applied when scaling from a laboratory formulation to a production batch in a 500 L twin-shaft paddle mixer, because dosing based on total powder weight will underdeliver polymer and reduce tensile adhesion in EN 1348 testing. The dry powder is added to the mixer with aggregates, cement, fillers, and additives; homogeneous distribution is typically achieved within 90–150 s at a mixing speed of 80–120 rpm for a 500 L batch. Overmixing beyond 180 s can generate heat and static charge, leading to build-up on mixer walls and inconsistent additive distribution.
Mixing water quality and curing humidity impose boundary conditions on the use of VA&VeoVa Copolymer RDP. If the water contains sulfate above 600 mg/L as SO₄²⁻, the sulfate can compete with the polymer for adsorption on cement hydration products and may accelerate ettringite formation. In such cases, a trial mix with 2.0–4.0 wt% RDP should be tested for 28-day compressive strength per EN 1015-11 and for wet-adhesion retention per EN 1348. If the curing RH exceeds 85% or the mortar is in continuous water contact, a hydrophobic VA/VeoVa grade is preferred; the standard medium-Tg grade may still perform, but the formulation should be checked for polymer film plasticization and delayed strength development. Do not combine the powder with borate-based retarders unless compatibility is confirmed by viscosity stability over 30 min per ISO 2555, because polyvinyl alcohol protective colloids can be crosslinked by borate ions. Silane-modified grades should not be pre-dispersed in acidic water below pH 5, because premature silane hydrolysis can reduce water-repellency after curing. Storage of opened bags at relative humidity above 65% can increase moisture content above 1.5 wt%, leading to caking and reduced re-dispersibility.
In two-component flexible cementitious waterproofing slurries tested per EN 14891, a low-Tg VA&VeoVa Copolymer RDP at 3.0–5.0 wt% of the dry component improves crack-bridging and water impermeability. The slurry is mixed with a 300–500 rpm paddle mixer, applied by brush or trowel in two coats with a total wet-film thickness of 1.5–2.0 mm, and cured for 24 h before water exposure. The polymer film reduces water penetration under the positive pressure specified in EN 14891 for 24 h on concrete substrates, while retaining sufficient flexibility to bridge cracks up to 0.3 mm at 23 °C. In self-leveling underlayments, addition of 1.0–2.0 wt% of a medium-Tg grade improves flexural strength measured by EN 196-1 and reduces surface abrasion. At 2.0 wt%, a formulation can achieve flexural strength class F6 and compressive strength class C30 under EN 13813 if the water-to-cement ratio remains below 0.50. Above 0.55, the polymer network retains additional water, lowers strength, and can extend the 24 h walk-on window. Because the VeoVa ester reduces the sensitivity of the polymer to the high pH of the underlayment, the hardened surface can be ground after 3 days without the rubbery roll-back observed with some VAc/E grades. The addition level must be verified against shrinkage and pull-off adhesion on the actual concrete substrate; published data for this specific configuration is limited.
