| HS Code | 691706 |
| Product Name | ELOTEX ST2750 |
| Product Type | Redispersible polymer powder |
| Polymer Family | Vinyl acetate-ethylene (VAE) copolymer |
| Appearance | White, free-flowing powder |
| Bulk Density | 400-600 kg/m³ |
| Particle Size | ≤2% residue on 400 µm sieve |
| Ash Content | 10-15% by weight |
| Moisture Content | ≤1.0% by weight |
| Ph Of Redispersion | 7-8 at 25°C |
| Minimum Film Forming Temperature | Approximately 4°C |
| Shelf Life | 12 months from date of production in unopened original packaging under dry storage |
| Primary Applications | Tile adhesives, self-leveling compounds, repair mortars, and cementitious systems |
As an accredited ELOTEX ST2750 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELOTEX ST2750 is supplied as a free-flowing powder in 25 kg multi-layer paper bags with plastic liner, palletized and wrapped. |
| Container Loading (20′ FCL) | 20′ FCL container loading of ELOTEX ST2750: 25 kg bags on pallets, safely secured, dry powder, ready for shipment. |
| Shipping | ELOTEX ST2750 is a redispersible polymer powder shipped in moisture-protective bags, palletized and wrapped. It is non-hazardous under transport regulations, but must be kept dry and away from direct sunlight. Store at moderate temperatures; handle with care to avoid bag damage and dust generation. |
| Storage | Store ELOTEX ST2750 in its original, unopened packaging in a cool, dry place. Protect from moisture, direct sunlight, and high temperatures. Keep away from sources of ignition. Use within 12 months of production date; once opened, reseal tightly. Avoid excessive pressure or stacking damage. Ensure adequate ventilation in storage areas. |
| Shelf Life | Shelf life is 6 months from production date when stored unopened, dry, and protected from moisture. |
ELOTEX ST2750 is metered into a C2-class ceramic tile adhesive at 2.0 wt% to 4.0 wt% of the dry blend when the formulation must simultaneously meet the shear adhesion requirements of EN 12004:2007+A1:2012 after 30 min open time, 6 h water immersion, 25 freeze-thaw cycles, and heat ageing at 70 °C. A silo-blended dry mix typically contains 32–38 wt% CEM I 42.5 R, 60–65 wt% silica sand 0.1–0.5 mm, 0.3–0.5 wt% cellulose ether, and 0.2–0.4 wt% calcium formate accelerator. The polymer powder is added after the fine fillers have been pre-mixed for 90 s in a horizontal ploughshare mixer, because extended high-speed mixing above 150 rpm can generate enough frictional heat to soften the polymer particle shell and produce residues on paddle shafts. Water demand is held at 21–24 wt% of dry mix; at 2.5 wt% polymer addition, the fresh mortar exhibits a wet density of 1.55–1.65 kg/L and a pot life of 3–4 h when the maturing time is 5 min. The dispersed polymer particles coalesce around hydrating cement grains and at the interface with the tile back, forming a film that reduces interfacial shrinkage stress and increases deformability measured by EN 12002:2008 from below 2.5 mm for an unmodified mortar to 2.5–5.0 mm for a C2 S1 formulation. This is the boundary condition for an S1 deformable adhesive under ISO 13007-1:2010. For C2 S2 adhesives, the dosage is moved toward the upper end of the range and the cement content is partially replaced with 5–10 wt% trass or metakaolin, but the risk of over-retardation appears when the total fine-filler content exceeds 70 wt% and the potassium sulfate content of the cement exceeds 1.2 wt%. Production-scale continuous lines using a twin-shaft continuous mixer observe batch-to-batch variation in open time when the sand moisture is above 0.3 wt%, because free moisture pre-activates the polymer and reduces the later redispersibility. The terminal products include large-format porcelain tile installed over cement-based screeds, on heated screeds, and on existing ceramic tile after mechanical profiling.
| Performance property | Test standard | Typical conditioning before test |
|---|---|---|
| Initial shear adhesion | EN 1348:2007 | 28 d dry storage at 23 °C |
| Shear adhesion after water immersion | EN 1348:2007 | 7 d dry + 21 d water immersion |
| Shear adhesion after heat ageing | EN 1348:2007 | 14 d dry + 14 d at 70 °C |
| Shear adhesion after freeze-thaw cycling | EN 1348:2007 | 7 d dry + 21 d water + 25 cycles |
| Transverse deformation | EN 12002:2008 | 28 d dry storage |
In self-leveling underlayments produced for installation beneath resilient flooring and LVT, ELOTEX ST2750 is incorporated at 2.0 wt% to 5.0 wt% on total dry formulation to control bleed, promote a closed-surface topography, and maintain tensile adhesion to concrete substrates after 28 days of drying. A typical pumped floor compound contains 25–35 wt% ordinary Portland cement, 5–15 wt% calcium aluminate cement or calcium sulfate, 45–60 wt% silica sand 0.1–0.3 mm, 0.1–0.3 wt% polycarboxylate superplasticizer, 0.05–0.15 wt% defoamer, and 2–5 wt% redispersible polymer powder. The water-to-powder ratio is controlled to 0.20–0.24; a deviation of +0.5% absolute water content can increase the EN 12706:1999 ring flow from 130 mm to 165 mm and simultaneously reduce 24 h surface hardness by more than 15%. Continuous mixing pumps with a 50 L/min output require a pre-mix hydration stop of 120 s before pumping; direct pumping without this dwell time produces air voids at the interface with primed concrete because the polymer has not fully redispersed. The polymer film strengthens the hydration and carbonate matrix at the top 3 mm of the screed, where carbonate enrichment and dusting normally occur. This is relevant for direct application of polyurethane adhesives under 2.5 mm luxury vinyl planks, where the moisture content of the underlayment must remain below 2.0 CM-% before adhesive application under EN 13813:2002 and related moisture measurement protocols. Field experience on 25 kg bag lines indicates that polymer lumps in pump filters are reduced when the powder is screened through a 250 µm sieve before the bagging hopper; published data for this specific configuration is limited. The terminal output is a 3–20 mm thick cementitious floor screed designed for retail, hospital, and multi-storey residential slabs where floor flatness under DIN 18202 table 3 is specified.
When cementitious adhesive and base-coat mortar is used for external thermal insulation composite systems, the polymer dosage is set between 2.5 wt% and 5.0 wt% of the dry mortar to maintain adhesion to expanded polystyrene boards and to bridge shrinkage cracks that initiate around the embedded glass-fiber mesh. The formulation usually combines 28–34 wt% CEM I 42.5 R, 0.1–0.3 wt% cellulose ether, 2–5 wt% hydrated lime or limestone filler, and 55–65 wt% silica sand 0.1–0.7 mm. In adhesive mortars for EPS boards, the fresh mortar is applied by notched trowel in strips or dots; the wet film must remain open for at least 20 min at 23 °C and 50% RH before board placement, which requires a polymer film-forming window that does not seal the surface too early. In base-coat applications, the mortar is spread at 3–5 mm dry thickness over the EPS board, a 160 g/m² alkali-resistant glass-fiber mesh is immediately bedded into the wet layer, and a second pass brings the total dry thickness to 5–8 mm. The polymer redispersed into the mixing water fills capillary voids and increases the peel adhesion of the base coat to the EPS substrate; adhesion values above 0.08 MPa are commonly targeted before the test specimen is stored for 24 h in water at 23 °C and pulled at 10 mm/min according to ETAG 004 / EAD 040083-00-0404 procedures. A critical processing failure occurs when the base coat is applied over EPS surfaces hotter than 40 °C, because accelerated water loss prevents coalescence and produces a chalky surface with lower impact resistance under the EOTA method. The same polymer addition also controls the dynamic water absorption of the render system, but it is not a substitute for a hydrophobic or silicone-based water-repellent admixture when the system must meet EN 13499:2003 requirements for ETICS. The terminal construction is an exterior wall with expanded polystyrene insulation finished with a synthetic resin plaster.
The crack-bridging capacity of a one-component flexible cementitious slurry is governed less by the film elongation of the redispersed polymer than by the polymer-to-cement ratio, the applied dry film thickness, and the rate of moisture release from the substrate. ELOTEX ST2750 is dosed at 3.0 wt% to 5.5 wt% of the dry powder in waterproofing slurries designed for balconies, wet rooms, and below-tile waterproofing under EN 14891:2017. The dry blend contains 35–45 wt% CEM I 42.5 R or 42.5 N, 40–50 wt% silica sand 0.1–0.4 mm, 5–15 wt% limestone filler, 0.2–0.4 wt% cellulose ether, and trace defoamer. Mixing is carried out with a low-speed paddle mixer at 400–600 rpm for 3 min, followed by a 5 min maturation and a shorter 30 s re-mix; the water demand is 22–26 wt%. The wet slurry is applied by trowel or brush in two passes, with the second pass cross-applied after the first has become tack-free but not fully cured, usually after 2–4 h at 20 °C. Total dry film thickness is held at 2.0–3.0 mm because film thickness below 1.5 mm shows reduced crack bridging under EN 14891 and thickness above 4.0 mm can entrap air and form surface pinholes. The polymer film bridges microcracks after hydration; when the slurry contains insufficient polymer, the crack-bridging failure occurs at the cement-polymer interface rather than within the polymer film. A production-scale limitation appears in continuous dry-mix plants that blend at high shear: the polymer powder should be added in the last 60–90 s of the mixing cycle to prevent the powder from being smeared over the aggregate particles and losing its free-flowing redispersion behavior. Published data for the exact crack-bridging value of ELOTEX ST2750 in this configuration is limited, but the formulation window above is consistent with one-component waterproofing mortars tested under EN 14891:2017. The terminal products are tile-backing waterproofing layers beneath ceramic and natural stone finishes in interior and exterior wet areas.
In structural and non-structural repair mortars classified under EN 1504-3:2005, ELOTEX ST2750 is incorporated at 2.0 wt% to 4.0 wt% of the dry mix to compensate for the reduced aggregate interlock in sections placed at 10–40 mm thickness. The binder system is typically 35–40 wt% CEM I 42.5 R blended with 5–8 wt% silica fume or fly ash, while the aggregate fraction uses 0.1–1.0 mm quartz sand and minor 0.01–0.1 mm filler. The mixing water is kept at 14–16 wt%; a polymer-modified repair mortar at this water demand reaches a stiff trowel consistency and is placed by steel trowel in layers up to 30 mm per pass. The redispersed polymer acts as a water-retention and film-forming aid, increasing the tensile adhesion to a mechanically prepared concrete substrate from below 1.5 MPa for unmodified mortar to above 2.0 MPa when tested at 28 days under EN 1542:1999. This is the minimum adhesion requirement for class R3 and R4 repair mortars under EN 1504-3, and the higher dosage is used where the repair is exposed to freeze-thaw cycles with de-icing salts. The processing limitation is that polymer addition lowers the early compressive strength at 24 h; therefore, a repair mortar specified for early reopening should not be formulated above 2.5 wt% unless the cementitious accelerator dosage is increased. Production-scale vertical-axis mixers with 200 L capacity show dense but still pumpable mortar when the powder is introduced after the cement and silica fume have been pre-blended for 60 s. The terminal applications include spall repair on balconies, patch repair of concrete edges, and reprofiling of floor slabs before self-leveling underlayment installation.
In cementitious tile grouts for interior wet areas and exterior walkways, ELOTEX ST2750 is used at 1.0 wt% to 3.0 wt% of the dry mix to lower the capillary water absorption of the cured joint and to improve early hydration in joints narrower than 3 mm. The grout consists of 25–35 wt% white or grey CEM I 52.5 R, 50–60 wt% calcium carbonate filler 0.01–0.1 mm, 5–10 wt% quartz sand 0.1–0.3 mm, 0.1–0.3 wt% cellulose ether, and optional inorganic pigments. The water-to-powder ratio is maintained at 0.18–0.22, producing a smooth paste that can be pressed into joints with a rubber scraper. After 15–20 min at 23 °C, the surface is washed with a damp sponge; excessive washing before the polymer has formed a surface film can pull out pigment and polymer, leading to joint colour variation. The cured grout is tested under EN 12808-5:2008 for water absorption; values below 10 g for a 30 min immersion are achieved more reliably when the polymer dosage is above 1.5 wt%, although the exact value depends on the calcium carbonate fineness and compaction effort. Polymer addition also reduces efflorescence by limiting the movement of dissolved calcium ions to the joint surface during the first 72 h of drying. The terminal products include grouts for porcelain and glass mosaic in showers, steam rooms, and exterior terraces where conventional cement grouts without polymer would exceed the water absorption target.
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ELOTEX ST2750 is a spray-dried redispersible polymer powder based on a vinyl acetate/ethylene/vinyl chloride terpolymer and supplied with a mineral anti-caking agent. The powder is incorporated into cementitious dry-mix mortars before water is added. On wet mixing, the polymer particles redisperse into the aqueous phase; during drying they coalesce to form a polymer film that bridges microcracks, reduces water uptake, and modifies adhesion to dense substrates. The product is specified for cementitious tile adhesives, patching and repair mortars, self-leveling underlayments, and one- or two-component waterproofing slurries. The vinyl chloride fraction distinguishes the polymer from conventional vinyl acetate/ethylene powders by increasing film hydrophobicity, while the ethylene sequence reduces the minimum film-forming temperature. Technical data sheets list bulk density in the range 450–650 g/L, residual moisture ≤1.0 wt%, ignition residue 10–14 wt%, and a minimum film-forming temperature near 0°C. These are release values, not standing specifications. The powder is not a primary cementitious binder; it is a polymer modifier used at addition rates from 1.0 wt% to 6.0 wt% in most dry mortars, with higher dosages reserved for deformable or waterproofing grades.
The material is controlled in dry form by bulk density, moisture content, ash residue, pH of an aqueous dispersion, particle size, and minimum film-forming temperature. Table 1 summarizes the release ranges commonly used for incoming inspection.
| Property | Typical release range | Test basis |
|---|---|---|
| Polymer composition | Vinyl acetate/ethylene/vinyl chloride terpolymer | Manufacturer FTIR reference |
| Appearance | White free-flowing powder | Visual |
| Bulk density | 450–650 g/L | ISO 60 |
| Residual moisture | ≤1.0 wt% | Gravimetric drying at 70°C |
| Ignition residue | 10–14 wt% | ISO 3451-1 |
| pH, 10% dispersion | 6.5–9.0 | ISO 787-9 |
| Minimum film-forming temperature | approx. 0°C | ISO 2115 |
| Particle size >300 µm | ≤2.0 wt% | ISO 4610 |
The ash residue arises primarily from the mineral anti-caking agent and is not a measure of polymer filler. When calculating active polymer content in a dry-mortar formulation, the ignition residue should be subtracted from the added powder mass. Redispersibility is assessed by dispersing the powder in deionized water at 20°C using a high-shear mixer at 1000 rpm for 60 s; the resulting dispersion is screened through a 250 µm sieve. A retained residue above 0.5 wt% indicates partial agglomeration and may require pre-drying or longer dry blending. The minimum film-forming temperature near 0°C allows film coalescence in damp mortar at substrate temperatures above 5°C, but strength development remains dependent on cement hydration and water availability. The pH of the dispersion, normally 6.5–9.0, is compatible with high-pH cementitious systems but can shift when superplasticizers or accelerators are added.
In cementitious tile adhesive formulations mixed to EN 12004, the powder is typically introduced at 2.0–6.0 wt% of total dry mix for C2-classified products. The dry blend is mixed with water for 120–180 s in a planetary paddle mixer; the polymer disperses during the wetting phase and forms a film after the adhesive is applied and begins to dry. Curing before adhesion testing is commonly 7 days at 23°C and 50% relative humidity followed by the conditioning cycles specified in EN 1348. C2 adhesives must retain a tensile adhesion strength of at least 1.0 N/mm² after water immersion, heat ageing, and freeze-thaw cycling. Formulations containing ELOTEX ST2750 are evaluated on concrete slabs, porcelain tiles, and low-porosity glass tiles. Industrial field data show that with adequate polymer dosage and substrate preparation, tensile pull-off failure moves from the adhesive interface toward the substrate or tile body. Published data for this specific product in complete formulation systems is limited; therefore, batch-specific verification against the relevant EN classification remains mandatory.
Pot life under EN 1346 is usually adjusted with retarders or cellulose ethers; the polymer influences pot life mainly through viscosity retention. Slip resistance measured by EN 1308 is improved by the low-shear viscosity generated by the redispersed polymer. In practice, a tile adhesive containing 3.0 wt% ST2750 may show more pronounced shear-thinning than an unmodified mortar, which improves trowel spread but can increase false-set if water demand is not optimized. For deformable adhesives classified S1 or S2 under EN 12004, polymer dosage is typically raised to 6.0–10.0 wt%. The transverse deformation test uses a 280 mm × 45 mm × 5 mm specimen cured for 28 days; S1 requires ≥2.5 mm deformation and S2 requires ≥5.0 mm. ELOTEX ST2750 contributes to plastic deformation capacity because the polymer film bridges microcracks and reduces brittle failure. Classification also depends on cement content, aggregate grading, and water demand.
Production-scale twin-shaft batch mixers with working capacities between 250 kg and 2000 kg are used for dry blending. Dry blending times of 180–240 s are typically sufficient to achieve homogeneity, but mixing intensity must be controlled because frictional heating can raise powder temperature and soften the polymer particles. If the powder temperature exceeds 30°C, the anti-caking layer may be compromised and the powder may form grit. In continuous mixing lines, the powder is metered through a loss-in-weight feeder downstream of the aggregate feed; feed rates from 0.2 kg/min to 5.0 kg/min require calibration against the main mixer throughput. Delayed addition of the polymer into the wet mix can reduce lump formation, but it is not recommended for all mixer types because the short mixing window may leave undispersed polymer on nozzle surfaces.
Dry blending of ELOTEX ST2750 into cement-rich formulations requires control of material temperature and ambient moisture. Silos, hoppers, and pneumatic transfer lines should be maintained below 60% RH; caking and loss of redispersibility have been observed when warm, humid conveying air condenses on the powder. Unopened bags have a typical shelf life of 12 months when stored at 5–30°C and ≤60% RH. Opened bags should be consumed promptly because the mineral anti-caking protection is finite and the polymer can absorb atmospheric moisture. The powder should not be exposed to temperatures above 40°C during silo storage, because partial sintering of polymer particles may occur. Pneumatic conveying of the powder through rotary airlocks can generate static charge and cause wall buildup; conveying air should be dried to a dew point below 5°C and velocities kept below 25 m/s to limit particle attrition. Attrition of the anti-caking layer can increase fines and modify bulk density, which changes metering calibration.
Formulators should avoid combining the powder with high dosages of soluble amine-based accelerators in closed systems; amine-induced pH shifts can destabilize the redispersed dispersion and generate grit. Polycarboxylate ether superplasticizers used in self-leveling underlayments can compete with the polymer for adsorption on cement surfaces; rheology should be evaluated with a rotational rheometer using a vane spindle at 20°C and shear rates from 0.1 s⁻¹ to 100 s⁻¹. The dosage of ST2750 above 10 wt% is technically possible but rarely provides proportional performance improvement; compressive strength reduction and increased air entrainment have been reported in cement-rich systems at such dosages. The product is not intended for use as the sole binder in non-cementitious formulations.
Low-viscosity self-leveling underlayments that incorporate ELOTEX ST2750 at 1.5–3.0 wt% usually require co-formulation with a polycarboxylate ether superplasticizer and a cellulose ether anti-settling agent. Water-to-powder ratios between 0.20 and 0.24 are common; the polymer modifies plastic viscosity and reduces segregation. Workability retention measured by minislump diameter after 30 min is sensitive to the timing of polymer dispersion and the dissolved sulfate content of the cement. Slump flow after 20 minutes should be measured with a flow table or a 30 mm × 50 mm minicone; loss of flow above 20% relative to initial indicates incompatibility between the polymer, cement, and superplasticizer. In cementitious patching mortars intended for vertical and overhead repairs, addition rates from 1.5–4.0 wt% are used to reduce modulus and improve adhesion to prepared concrete. Testing under EN 1504-3 for structural repair products requires compressive strength and adhesion; polymer addition above 4.0 wt% can delay cement hydration and reduce early compressive strength at 24 h. The product can also be used in exterior insulation and finish system base coats, where low-temperature flexibility and impact resistance are relevant. Published data for this specific configuration is limited; performance should be screened with full-scale adhesion and deformation tests rather than inferred from powder properties alone.
Replacement of a conventional vinyl acetate/ethylene powder with ELOTEX ST2750 in a two-component cementitious waterproofing slurry normally requires adjustment of the liquid polymer dosage and often the water reducer. The vinyl chloride sequence lowers equilibrium water sorption of the cured film; comparative testing under EN 14891 should include crack bridging at -5°C and +20°C, water impermeability at 1.5 bar, and adhesion after water immersion. Where the product replaces a standard vinyl acetate/ethylene powder at equivalent 3.0 wt% polymer content, the wet mix may exhibit slightly lower slump; water demand may rise by 0.5–1.5 wt% to restore workability. This shift should be verified with a flow cone or flow table before full-scale batching. The higher hydrophobicity can reduce surface staining and efflorescence in finished tile installations when the slurry is used as a waterproofing membrane under ceramic tiling.
| Characteristic | ELOTEX ST2750 | Conventional VAE powder | Acrylic/acrylate powder |
|---|---|---|---|
| Backbone chemistry | Vinyl acetate/ethylene/vinyl chloride terpolymer | Vinyl acetate/ethylene copolymer | Acrylic or methacrylic copolymer |
| Film hydrophobicity | Increased by vinyl chloride | Moderate | High |
| Wet adhesion to cementitious substrates | High | High | Moderate to high |
| Low-temperature film flexibility | Improved by ethylene | Improved by ethylene | Varies with glass transition temperature |
| Water absorption of cured film | Reduced | Moderate | Low |
| Use in self-leveling underlayments | Possible with superplasticizer adjustment | Common | Less common |
Differences between ST2750 and other ELOTEX grades are not defined by a single variable. Grades designed for self-leveling underlayments may have lower minimum film-forming temperature or faster film coalescence, while grades intended for pure adhesion promotion may carry less hydrophobic comonomer. The selection should be driven by the controlling EN classification and full-scale mortar performance, not by polymer powder data alone. When migrating from another powder, side-by-side testing at equivalent active polymer contents is required because changes in water demand, air entrainment, and open time can exceed the differences visible in the powder specification.
