| HS Code | 904444 |
| Product Name | ELOTEX Flex8300 |
| Chemical Basis | Vinyl acetate/ethylene (VAE) copolymer |
| Physical Form | Free-flowing powder |
| Appearance | White to off-white powder |
| Protective Colloid | Polyvinyl alcohol (PVOH) |
| Anti Caking Agent | Mineral anti-blocking agent |
| Bulk Density | Approx. 400-600 g/l |
| Particle Size | Typically <400 µm (air jet sieve) |
| Ph 10 Percent Water Solution | 6.0-8.0 |
| Ash Content | Approx. 10-14% |
| Minimum Film Forming Temperature | Approx. 0°C |
| Glass Transition Temperature | Approx. -8°C |
| Redispersibility | Excellent in water |
| Viscosity 20 Percent Solution | Approx. 10-30 mPa·s (Brookfield) |
| Shelf Life From Date Of Manufacture | 12 months when stored properly |
As an accredited ELOTEX Flex8300 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELOTEX Flex8300 is supplied as a free-flowing white powder in 25 kg multi-layer paper bags with an inner plastic liner. |
| Container Loading (20′ FCL) | 20′ FCL container loading for ELOTEX Flex8300: palletized bags, secured, full container load, safe transport. |
| Shipping | ELOTEX Flex8300 ships as a non-hazardous, dry polymer powder in moisture-protective bags on pallets. Use covered, dry containers to prevent humidity exposure. Keep away from moisture, heat, and direct sunlight during transit. Handle gently to avoid bag damage and ensure secure stacking for safe transport. |
| Storage | Store ELOTEX Flex8300 in its original, unopened packaging in a cool, dry environment. Protect it from moisture, humidity, and direct sunlight, and avoid high temperatures. Use within 12 months of manufacture under proper conditions. Keep containers tightly sealed when partially used, and follow all safety and handling guidelines. |
| Shelf Life | Shelf life is typically 12 months from manufacture if stored unopened in original packaging, kept cool, dry, and protected from moisture. |
Flexible cementitious tile adhesive formulations are dry-blended in low-shear horizontal ribbon mixers before cement and fine fillers are introduced. In formulations targeting C2S1/S2 deformability under ISO 13007-1, ELOTEX Flex8300 is incorporated at 2.5–4.5 wt% of the total dry-mix mass. The ethylene-modified vinyl acetate-ethylene copolymer redisperses on first water contact and forms a fine polymer dispersion that deposits a low-modulus film between cement hydrates and at the tile-mortar interface. Tensile adhesion after water immersion, heat ageing, and freeze-thaw cycling is evaluated according to EN 1348; C2-class adhesives must retain at least 1.0 N/mm² across all exposure conditions. Transverse deformation is measured per EN 12002, with S1 requiring a deformation of at least 2.5 mm and S2 requiring at least 5 mm. Production-scale behaviour indicates that adding the powder after the coarse silica fraction and before the finer calcium carbonate reduces agglomeration and improves blend uniformity in 500–1000 kg batches. The dry powder is mixed with 24–28 wt% potable water, rested for 5–10 min, and re-mixed to permit complete polymer redispersion before trowel application. Terminal use covers large-format porcelain and low-absorption ceramic tiles on heated screeds, timber substrates, and exterior façades, where differential movement between substrate and tile would otherwise exceed the strain capacity of an unmodified cementitious adhesive.
Below a wet-film thickness of 2 mm and over concrete substrates exhibiting static cracks up to 0.75 mm, polymer-modified cementitious slurries resist water penetration only when the polymer phase forms a continuous interpenetrating network with cement hydrates. In two-component waterproofing compositions, ELOTEX Flex8300 is blended at a polymer-to-cement ratio between 0.15 and 0.30 by mass, with total powder addition commonly reaching 25–40 wt% of the dry component. Crack-bridging and low-temperature flexibility are assessed under EN 14891 and EN 1062-7; recorded values must state film thickness, crack opening, and test temperature, because data reported without these boundary conditions are not technically comparable. The flexible latex film lowers the brittle cement-matrix modulus at the crack tip, redistributing tensile strain across the cured layer before cohesive failure occurs at the film-cement boundary. The mixed slurry is applied by brush, notched trowel, or airless spray at 1–3 kg/m² per coat, with reinforcing mesh embedded where dynamic movement is expected. Curing at 23 °C and 50% RH produces a coherent film; application below 5 °C retards film coalescence and should be avoided because early polymer deposition becomes discontinuous. Terminal products include basement retaining walls, lift pits, wet rooms, balconies, and potable-water contact structures where additional compliance with EN 16402 may be required.
Exterior insulation base coats demand a simultaneous resolution of crack control, impact resistance, and water-vapour permeability. In ETICS/EIFS base coat mortars, ELOTEX Flex8300 is dosed at 2.0–4.0 wt% of the dry mortar and is distributed before the fine limestone filler to avoid powder segregation in automated dosing lines. The mortar is applied with a 3–5 mm notched or flat trowel over glass-fibre mesh embedded in the first pass, keeping the reinforcement near the outer third of the base coat. Water absorption of the cured base coat is controlled below 0.5 kg/(m²·h0.5) when tested under ETAG 004 or the current European Assessment Document EAD 040083-00-0404. The flexible polymer phase contributes to impact resistance while maintaining open-pore water-vapour diffusion, which is critical over expanded polystyrene and mineral wool boards. High-shear mixing with water at 20 °C disperses the powder, but mixer speeds above 700 rpm for periods exceeding 3 min can entrain excessive air and reduce wet density on vertical façades. Terminal systems are externally insulated walls with thin render finishes, where the base coat must absorb thermal-gradient strain, resist wind-driven rain, and prevent stress cracking at insulation board joints.
| Application segment | Performance class | Primary test standard | Critical measured property |
|---|---|---|---|
| Flexible tile adhesive | C2S1/S2 | EN 12004-2, EN 1348, EN 12002 | Tensile adhesion ≥ 1.0 N/mm²; transverse deformation ≥ 2.5 mm (S1) or ≥ 5 mm (S2) |
| Flexible waterproofing slurry | CM | EN 14891 | Adhesion after wet storage, crack bridging at defined low-temperature exposure |
| Self-leveling underlayment | CT-C | EN 13813 | Flexural and compressive strength class, shrinkage behaviour |
| Concrete repair mortar | R3/R2 | EN 1504-3, EN 1542 | Pull-off adhesion on prepared concrete substrate, compressive strength class |
Self-leveling underlayment mixes based on ternary calcium aluminate, calcium sulfate, and ordinary Portland cement encounter rapid early-strength development but also a brittle final matrix. ELOTEX Flex8300 at 5–8 wt% in such ternary binder systems reduces restrained-shrinkage cracking and improves tensile strain capacity without extending flow life beyond the 90 min working window. Slurry mixing is performed in a forced-action paddle mixer at 500–700 rpm for 2 min, followed by 2 min of deaeration to remove entrained air. Water demand is adjusted to achieve a ring spread of 145–155 mm after 10 min when tested with a flow ring per EN 12706; higher powder addition increases plastic viscosity and may require a polycarboxylate ether superplasticizer to restore leveling. The cured underlayment is classified under EN 13813 as cementitious screed material; flexural strengths exceeding 4 N/mm² and compressive strengths exceeding 16 N/mm² are common industrial targets for flooring overlays receiving ceramic or vinyl coverings. The polymer film forms within capillary pores during drying, lowering water absorption and increasing surface abrasion resistance without blocking vapour exchange. Terminal uses include levelled concrete slabs over in-floor heating, renovation floors, and acoustic insulation overlays where layer thickness between 3 mm and 15 mm is specified.
Where concrete repair mortars are formulated under EN 1504-3, the required bond to the substrate and limited crack penetration depend on a polymer film that can deform without losing adhesion during outdoor freeze-thaw exposure. ELOTEX Flex8300 is included at 3–6 wt% in polymer-modified repair mortars, frequently in combination with silica fume or metakaolin to refine pore structure. The dry mortar is mixed with 12–16 wt% water, applied by trowel or dry spraying, and finished before the initial setting time; adhesion is measured by pull-off per EN 1542 on concrete substrates with a minimum average peak-to-valley roughness of 1.5 mm. The VAE film bridges microcracks at the repair interface while the cement matrix provides compressive strength. In patch repairs, layer thickness between 5 mm and 30 mm is typical; thicker sections require coarse aggregate extension to control heat of hydration and shrinkage. Field observations from batch sizes above 500 kg indicate that adding the powder before microsilica in paddle mixers prevents wetting defects and lump formation. Terminal uses include spalled balcony edges, concrete column repairs, precast element patching, and bridge deck soffit repairs where chloride exposure is a concern. Published data for this specific product configuration in chloride-laden environments is limited; formulators should run chloride migration testing under NT Build 492 before specifying long-term durability in marine or de-icing salt exposure.
Skim coats based on white cement and calcium carbonate require a polymer dosage that stabilises the fresh paste without extending surface open time beyond acceptable repainting intervals. ELOTEX Flex8300 added at 2–4 wt% to a white cement skim coat produces a continuous film at the surface once the mortar dries below its minimum film-forming temperature. The film improves burnish resistance, reduces powdering, and improves wet adhesion to gypsum plaster and old painted concrete. Mixing in a slow-speed paddle at 400 rpm with 30–35 wt% water yields a creamy paste; the product should be re-tempered after 10 min to redisperse polymer particles that accumulate at the air-water interface. Application thickness is typically 1–3 mm. During hardening, the polymer phase does not significantly interfere with cement or gypsum hydration, but high-retardation organic acids in some plasters may extend final set; compatibility testing per EN 13279-2 is recommended for gypsum-based systems. Terminal products include decorative white finishing coats, interior wall levelling compounds, and repair skim coats under high-build paint systems.
Mineral renders applied over rigid substrates accumulate thermal strain at exposed corners, window reveals, and movement joints. A flexible polymer binder such as ELOTEX Flex8300 shifts failure from a discrete crack to distributed micro-relief when the render layer is restrained. The powder is blended at 3–5 wt% of the dry render, with coarse sand fractions below 1.2 mm to reduce aggregate interlock and improve elongation. Water demand is set to produce a stiff slump for machine spraying; after spraying, the render is left for 24–48 h before finishing. Shrinkage is measured per EN 12617-4 on prism specimens; elongation at break of the polymer film can be evaluated by film tensile testing per ISO 527-3 on films cast at 23 °C and 50% RH. The cured facade render must maintain adhesion after artificial weathering cycles, as assessed by EN 1015-12. Terminal applications include high-performance exterior renders for concrete and autoclaved aerated concrete, decorative scraped finishes, and crack-bridging applications on lightly cracked substrates. Published data for this specific render configuration is limited, so exact crack-width suppression should be confirmed on full-size mock-up panels under ETAG 004 or national facade test protocols before installation.
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ELOTEX Flex8300 is a vinyl acetate-ethylene (VAE) copolymer redispersible polymer powder formulated for cementitious dry mixes that require deformability and water resistance without external coalescing solvents. The product is supplied as a white, free-flowing powder with a specified nonvolatile content of 99 ± 1 wt%. Ash content by ISO 3451-1 after 1 h at 1000 °C is reported in the range of 11–13 wt%. Bulk density determined by ISO 3923-2:2019 is 450–650 g/L, and the pH of a 10 wt% aqueous redispersion is 7.0–9.0. The minimum film formation temperature is approximately 0 °C, measured by ISO 2115:2000. Published data for the exact glass transition temperature of this specific grade is limited; available information positions the polymer in the low-Tg VAE class, which distinguishes it from higher-Tg VAE powders used in self-leveling compounds and from vinyl acetate/vinyl ester copolymers that require external coalescents for film formation at 23 °C.
The primary use of ELOTEX Flex8300 is as a polymer modifier in factory-blended dry mortars. The powder is dry-mixed with cement, graded aggregate, and rheology-modifying admixtures, then redispersed in water on site. This delivery form eliminates the storage and dosing issues associated with liquid latex admixtures, although the powder remains hygroscopic and must be protected from moisture. The powder is manufactured by spray drying an aqueous VAE dispersion. During spray drying, the primary polymer particles are agglomerated and protected by a water-soluble colloid; this architecture allows the dry powder to redisperse in mixing water as the colloid dissolves. The redispersed particle size after high-shear mixing is typically in the 1–10 µm range, which is comparable to the original latex particle size.
| Property | Typical range | Standard basis |
|---|---|---|
| Bulk density | 450–650 g/L | ISO 3923-2:2019 |
| Ash content at 1000 °C | 11–13 wt% | ISO 3451-1 |
| pH of 10 wt% dispersion | 7.0–9.0 | ISO 976 |
| Minimum film formation temperature | approximately 0 °C | ISO 2115:2000 |
| Residue on 315 µm sieve | typically below 2 wt% | ISO 2591-1 |
The flexibility gain in a cementitious mortar is not produced by reducing cement strength alone; it results from a continuous elastomeric polymer film that forms in the hydrated cement pore system. When ELOTEX Flex8300 is redispersed in the alkaline mixing water, the protective colloid dissolves and releases the polymer particles. As cement hydration consumes water, the polymer particles coalesce into a film across capillary pores, microcracks, and aggregate-cement interfaces. At a dosage of 3.0 wt% on total dry mix, this film increases the strain capacity of the mortar and reduces the brittleness of the cement matrix. For tile adhesive classification under EN 12004-2:2017, transverse deformation is measured by EN 12002:2008. A deformable S1 adhesive requires a transverse deformation of at least 2.5 mm; a highly deformable S2 adhesive requires at least 5.0 mm. ELOTEX Flex8300 is specifically positioned for C2S1 and C2S2 formulations, but the final classification depends on cement type, polymer dosage, water demand, and aggregate grading.
The water resistance of the coalesced VAE film supports adhesion retention after immersion. Tensile adhesion strength under EN 1348 is used to assess performance after dry storage, water immersion, heat ageing, and freeze-thaw cycling. For C2 adhesives, the required tensile adhesion strength is at least 1.0 MPa under each exposure condition, whereas C1 adhesives require at least 0.5 MPa. In formulation development, increasing polymer dosage improves deformability and water resistance but can prolong setting time and reduce early tensile strength. Isothermal conduction calorimetry may show a delay in the main silicate hydration peak when polymer dosage exceeds 4.0 wt%; the magnitude varies with cement alkali content and dispersant chemistry. Therefore, EN 196-3 setting time and EN 1348 early strength are part of the quality control matrix before production approval.
In cementitious systems, the VAE copolymer interacts with cement hydration in two ways. The polymer particles can adsorb onto cement grain surfaces and retard the initial hydration of tricalcium aluminate, which influences setting time. The ethylene content contributes to the film’s low modulus and water resistance, while the vinyl acetate segments provide adhesion to cement hydrates and aggregates. The transverse deformation improvement from 2.0 wt% to 4.0 wt% polymer is not linear; at the upper end, air entrainment and the reduction in modulus of the bulk matrix can produce a larger gain in deformability but a sharper fall in compressive strength. Formulators therefore use a ternary design space of polymer dosage, water demand, and cement content rather than a single addition rate.
Redispersion quality depends on mixing water temperature and shear history. Laboratory dissolver dispersion at 23 °C and 1200 rpm is used to confirm that the powder yields a smooth dispersion without grit. In cold-weather application below 5 °C, film formation is retarded; water or substrate temperatures above 15 °C are recommended. No external coalescing solvent is required at application temperatures above the minimum film formation temperature of approximately 0 °C.
In two-component cementitious waterproofing slurries applied by trowel, brush, or spray, ELOTEX Flex8300 is incorporated at 3.0–5.0 wt% of dry mix. The resulting slurry is designed to meet the liquid-applied water impermeable product scope of EN 14891:2017. The polymer modifies the hardened membrane by increasing tensile elongation and reducing water absorption; it also improves adhesion to damp mineral substrates. Crack-bridging performance under EN 14891 is a critical selection criterion. A 2 mm cured membrane is generally evaluated for the ability to bridge a static crack of at least 0.5 mm at 23 °C and, for higher-performance classes, at reduced temperature. The final result is matrix-dependent: high cement content and a water-to-powder ratio below 0.30 increase strength but reduce crack-bridging capacity unless the polymer dosage is moved toward the upper end of the range. At dosages above 5.0 wt%, air entrainment can create pinholes in cured membranes; a defoamer addition of 0.05–0.20 wt% is commonly required to maintain a pinhole-free surface.
The cured membrane performance under EN 14891 is sensitive to curing conditions. At 23 °C and 50% relative humidity, film formation is complete within 7 d for a 2 mm layer; at lower temperatures or low humidity, a longer curing period is required before water load. The water-to-powder ratio of the mix typically falls between 0.24 and 0.29 for trowel application; higher ratios improve workability but increase the risk of pinhole formation and crack-bridging failure.
The product is not intended for solventborne reactive systems because film formation depends on water removal and cement hydration. In formulations containing high-alumina cements or calcium sulphoaluminate binders, published data for this specific polymer configuration is limited. Compatibility must be confirmed by EN 196-3 setting time and EN 1348 adhesion retention after water immersion before production use. The dry powder should not be mixed with calcium chloride accelerators or with coagulating salts in the gauging water prior to redispersion; destabilization of the latex can occur and reduce film quality. For the same reason, the powder should not be pre-dispersed in water containing borates or high concentrations of alum.
Thin-bed tile adhesive formulations requiring C2S1 or C2S2 classification under EN 12004-2 are a primary application for ELOTEX Flex8300. The dry mix typically contains rapid-hardening Portland cement, silica sand with a maximum grain size below 0.5 mm, cellulose ether for water retention, and the VAE powder. The addition window is commonly 2.5–4.0 wt%. At 4.0 wt%, wet mortar viscosity increases and open time may be extended, but early tensile strength can fall below the 1.0 MPa C2 threshold after water immersion if the formulation is not rebalanced by reducing water demand or increasing cement content. The standard test sequence includes EN 1348 tensile adhesion strength after dry, water-immersion, heat-ageing, and freeze-thaw storage, and EN 12002 transverse deformation. A formulation targeting S2 deformability should not rely on polymer content alone; aggregate grading, cement reactivity, and air content are equally influential.
The combination of ELOTEX Flex8300 with cellulose ether is critical for open time. Cellulose ether retains mixing water, which also keeps the polymer particles mobile for a longer period and allows film formation after the adhesive is applied. Formulators adjust the ratio of cellulose ether to VAE powder to maintain an open time above 20 min at 23 °C and 50% relative humidity, as measured by the EN 1346 wetting method. The polymer itself is not a water-retention agent, and replacing cellulose ether with additional polymer powder generally does not produce acceptable open time in thin-bed adhesives.
| Application | Typical dosage on dry mix (wt%) | Relevant standard | Critical performance criterion |
|---|---|---|---|
| Flexible thin-bed tile adhesive C2S1/S2 | 2.5–4.0 | EN 12004-2; EN 1348; EN 12002 | Transverse deformation ≥2.5 mm for S1 or ≥5.0 mm for S2; tensile adhesion ≥1.0 MPa for C2 after specified storage |
| Two-component cementitious waterproofing slurry | 3.0–5.0 | EN 14891 | Crack bridging ≥0.5 mm at 2 mm layer; water impermeability |
Dry-mix plants that meter the powder through loss-in-weight or gravimetric screw feeders achieve lower polymer-content variance when the powder is introduced into the sand and cement preblend before fine fillers and cellulose ether. The bulk density range of 450–650 g/L permits standard single-screw conveyors, but storage should be maintained below 30 °C and below 60% relative humidity to prevent blocking. Because the powder redisperses on contact with water, condensation on silo walls can create localized hydration skins; such material must be screened before production use. On continuous twin-shaft mixers with a residence time of 120–180 s, adding the powder with the first third of the aggregate charge reduces segregation compared with addition after the cellulose ether. Sieve retention on 315 µm is typically below 2 wt%; variation is influenced by storage conditions and conveying shear. At dosages up to 5.0 wt%, no adjustment to cement hydration chemistry is generally required, but setting time should be monitored by EN 196-3 when the product is combined with accelerators or high-alkali Portland cement.
In high-shear conveyor lines, the powder may develop electrostatic charge at very low relative humidity; grounding of conveying lines is standard practice to avoid segregation and dust accumulation. The dust from the powder is combustible as an organic material; local dust-explosion prevention measures apply according to plant-specific risk assessments, including avoidance of ignition sources and appropriate venting. The powder is not classified as acutely toxic, but inhalation of dust should be controlled with local exhaust ventilation and respiratory protection according to workplace exposure limits for inert nuisance dust.
Relative to higher-Tg VAE redispersible powders used in self-leveling underlayments, ELOTEX Flex8300 shifts the performance balance toward deformability and crack bridging rather than compressive strength. The lower minimum film formation temperature of approximately 0 °C enables coalescence at standard application temperatures without external coalescent; higher-Tg grades may show MFFT values above 4 °C and require substrate temperatures above 20 °C for complete film formation. Compared with acrylic-based redispersible powders, the VAE chemistry of ELOTEX Flex8300 typically provides a different balance of tensile adhesion and rigidity. Acrylic powders can offer low water absorption and high UV stability, but they may require higher dosages to achieve equivalent deformability in cementitious systems and can increase formulation cost. In tile adhesive formulations under EN 12004-2, the choice between VAE and acrylic modifiers should be validated by EN 1348 adhesion after water immersion and by EN 12002 transverse deformation, because polymer film properties alone do not predict mortar performance. Published direct comparison data under identical cementitious matrices is limited; selection should therefore be based on the full application-specific test matrix rather than on glass transition temperature alone.
Another product class difference concerns alkali stability. VAE redispersible powders are generally stable in the high-pH environment of fresh cement, whereas some acrylic grades may require specific surfactant stabilization to avoid coagulation in highly alkaline water. The protective colloid system of the VAE powder is selected for solubility in alkaline media, which allows the polymer to redisperse and coalesce even when the aqueous phase is saturated with calcium hydroxide. This is one reason why VAE chemistry is widely used in cementitious repair mortars and patching compounds. However, the alkali stability does not eliminate the need for dosage validation when the mortar contains reactive pozzolans such as silica fume or metakaolin; these materials increase water demand and can affect the polymer film distribution.
ELOTEX Flex8300 is not intended to replace high-performance epoxy or polyurethane systems in immersion-grade chemical environments. Its performance ceiling is determined by the cementitious binder and by the dosage-related air entrainment threshold near 5.0 wt%. The powder complies with the general safety and environmental requirements applicable to polymer powders in the European Union; specific REACH registration and EMICODE certification must be confirmed for the final mortar formulation.
