| HS Code | 772655 |
| Chemical Base | Vinyl Acetate/Ethylene Copolymer |
| Appearance | White Powder |
| Bulk Density | 400-600 g/L |
| Solids Content | ≥98% |
| Ash Content | 10-15% |
| Ph Value 10 Solution | 6-8 |
| Particle Size 100 Mesh Residue | ≤2% |
| Minimum Film Formation Temperature | 0°C |
| Tensile Adhesion Strength To Eps 28 Days | ≥0.10 MPa |
| Water Resistance Tensile Adhesion After Water Immersion | ≥0.08 MPa |
| Open Time | ≥15 Minutes |
| Freeze Thaw Stability | Stable After 5 Cycles |
As an accredited RDP for Insulation Board Adhesive Mortars factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RDP for Insulation Board Adhesive Mortars supplied in 20 kg moisture-proof laminated paper bags, ensuring easy handling, storage stability, and safe transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of RDP for insulation board adhesive mortars: 25kg bags on pallets, shrink-wrapped, moisture-protected, safely secured for transit. |
| Shipping | RDP for Insulation Board Adhesive Mortars is shipped as a free-flowing white powder in moisture-proof laminated or kraft paper bags, typically 20–25 kg net, palletized and shrink-wrapped. Keep dry, ventilated, away from heat/rain. Non-hazardous under standard transport regulations. Shelf life: 12 months in sealed original packaging. |
| Storage | Store RDP in a cool, dry, well-ventilated area, away from direct sunlight and excessive heat. Keep sealed in original packaging on wooden pallets to prevent moisture absorption and contamination. Avoid contact with water and humidity. Under proper conditions, shelf life is typically 6–12 months from production date. |
| Shelf Life | Store in cool, dry conditions. Unopened, shelf life is 12 months from production; avoid moisture and high temperatures. |
In the production of adhesive mortars for expanded polystyrene (EPS) board installation on concrete and masonry substrates, a redispersible polymer powder (RDP) based on vinyl acetate-ethylene copolymer is dry-blended at 1.8–2.5 wt% of total batch weight together with 28–32 wt% CEM I 42.5 R, 60–66 wt% graded quartz sand 0.1–0.5 mm, 0.4–0.6 wt% cellulose ether with a 2% solution viscosity of 40,000–60,000 mPa·s, 0.1–0.2 wt% starch ether, and 0.01–0.03 wt% air-entraining agent. Compliance for the assembled system is evaluated under EAD 040083-00-0404 with the EPS board type specified in EN 13163:2012+A2:2016; tensile adhesion of the hardened mortar is determined by EN 1015-12:2016 pull-off and bond to insulation by EN 13496:2013, with a minimum failure stress of 0.08 MPa and cohesive failure in the EPS board. Dry-mix production on a twin-shaft paddle mixer proceeds by pre-blending the fine fractions for 60–90 s, adding the cement and sand, and homogenizing for 180–240 s at a product temperature not exceeding 45 °C and residual moisture below 0.3 wt%; overmixing beyond 300 s can raise bulk temperature above the polymer film-forming threshold and create visible RDP inclusions. At the construction site, 21–23 wt% water is added to the dry mortar and mixed for 3–4 minutes to reach a flow table spread of 160–180 mm per EN 1015-3:1999, followed by application in full-bed or spot-ribbon configuration with a 10×10 mm notched trowel. The EPS board is pressed into the fresh mortar within 5–10 minutes after spreading, leaving an open time not exceeding 20 minutes at 23 °C and 50% RH; the terminal product is a 25 kg moisture-protective bagged adhesive mortar for EPS-based external thermal insulation composite systems on new concrete, brick, and blockwork.
Extruded polystyrene (XPS) boards differ from EPS in closed-cell surface morphology and residual extrusion skin, which lowers surface energy and reduces mechanical keying of cementitious adhesive mortars. For XPS insulation board adhesive mortars, the RDP dosage is raised to 3.0–4.5 wt% of dry formula, with Portland cement CEM I 52.5 N at 30–34 wt%, silica sand 0.1–0.4 mm at 55–62 wt%, limestone filler 5–10 wt%, cellulose ether 0.5–0.8 wt%, starch ether 0.2–0.4 wt%, and a powdered hydrophobic modifier at 0.2–0.5 wt% where unsanded boards are supplied. The system is judged under EAD 040083-00-0404 with XPS board per EN 13164:2012+A1:2015, and bond to insulation is tested by EN 13496:2013 at 28 days standard cure; the required failure mode is cohesive in XPS, while adhesive failure at an unsanded extrusion skin is a known nonconformity and may register below 0.05 MPa if boards are not mechanically keyed or sanded. Production experience on rotating drum and paddle batch lines shows that the combination of higher RDP content and low-sand surface area can shift the fresh mortar rheology toward excessive tack, so dry mixing must follow a two-stage sequence: fine fillers and RDP are preblended for 60–120 s, then cement and sand are added and mixed for 180–240 s with the batch temperature held below 40 °C; moisture ingress above 0.3 wt% from silo extraction or recycled aggregate causes RDP coalescence and screen blinding on the packaging line. At site, 20–22 wt% water is added to achieve a spread of 165–185 mm per EN 1015-3:1999, and the mortar is applied as a full-bed layer of 8–12 mm using a 10 mm notched trowel. Board embedment is performed by pressing and light tamping within 5 minutes; because XPS boards exhibit less capillary suction than EPS, open time is typically reduced to 15–20 minutes at 23 °C and 55% RH. The finished terminal material is a 25 kg bagged XPS-grade adhesive mortar that remains workable for 90–120 minutes and is designed for sanded or factory-keyed XPS boards used in external thermal insulation systems.
Mineral wool dual-density boards intended for external thermal insulation composite systems withdraw mixing water rapidly at the fibre-matrix interface, requiring a high-retention adhesive formulation rather than a conventional EPS adhesive. The dry-mix formula for mineral wool adhesive incorporates 3.5–5.0 wt% redispersible polymer powder, 30–34 wt% CEM I 42.5 R or 52.5 N, 50–60 wt% quartz sand 0.1–0.7 mm, 5–10 wt% limestone filler, 0.6–1.0 wt% cellulose ether with a 2% solution viscosity of 60,000–80,000 mPa·s, 0.1–0.3 wt% starch ether, and 0.02–0.05 wt% air-entraining agent. The system standard is EN 13500:2003 for ETICS with mineral wool, with the board specified under EN 13162:2012+A1:2015; mechanical performance of the hardened adhesive is assessed by EN 1015-12:2016, while the adhesive bond to mineral wool is checked by EN 13496:2013, and the minimum tensile failure stress is 0.08 MPa with the preferred failure mode in the mineral wool laminating layer. On dry-mix production lines, the high cellulose ether dosage increases bulk viscosity and can reduce throughput, so mixer fill level is limited to 70–75% of rated capacity and mixing time is extended to 240–300 s; batch-to-batch variance in fibre suction can cause variable open time on site, which is mitigated by selecting a high-molecular-weight cellulose ether rather than by increasing RDP alone. The construction process requires 24–27 wt% mixing water to reach a flow table spread of 170–190 mm per EN 1015-3:1999, and the adhesive is applied by 10×10 mm notched trowel in vertical strips or full bed to a thickness of 10–15 mm; boards are pressed within 10 minutes, and the open time is limited to 15 minutes at 23 °C and 60% RH due to rapid dewatering. The terminal product is a 25 kg bagged adhesive mortar for mineral wool ETICS, typically produced as a companion material to an identical-polymer basecoat to maintain system traceability.
Existing ceramic tile facades and painted renders present a closed-pore substrate with limited capillary suction, where adhesive bond relies on polymer-modified adhesion to surface films rather than cement hydration growing into open pores. The standard overlay practice under EAD 040083-00-0404 permits bonding to existing masonry only where the substrate pull-off strength is measured by EN 1015-12:2016 and where the substrate is free of delaminating coatings; because this threshold may be below the cohesive strength of weak paint films, mechanical fasteners are often included in the system specification. For renovation-grade insulation board adhesive mortar, RDP content is increased to 4.0–6.0 wt% of dry formula, together with 32–36 wt% CEM I 42.5 R or 52.5 N, 50–58 wt% sand 0.1–0.5 mm, 5–10 wt% limestone filler, 0.5–0.8 wt% cellulose ether, 0.2–0.4 wt% starch ether, and 0.2–0.4 wt% powdered polycarboxylate ether superplasticizer to keep water demand at 19–22 wt% while maintaining a spread of 160–180 mm per EN 1015-3:1999. Dry-mix production follows a two-shaft paddle process with a maximum batch temperature of 45 °C and residual moisture below 0.3 wt%; the higher organic content increases the risk of polymer accretion on the mixer wall when the mixing time exceeds 300 s, so the line is cleaned after every 20–25 batches. On the building site, the renovation adhesive is applied in a full bed of 5–10 mm after mechanical cleaning and dust extraction; the insulation board must be pressed into the uncured mortar within 5–10 minutes, and the open time is shortened to 10–20 minutes depending on ambient conditions. The terminal finished product is a 25 kg polymer-modified bagged adhesive mortar for ETICS renovation over stable ceramic, glazed, or painted substrates, with supplemental mechanical fixings specified by the system supplier.
Machine application of insulation board adhesive mortar is specified when daily installation rates exceed 300–500 m² and continuous mixing pumps such as rotor-stator mixers or horizontal mixing pumps are used. Under these shear conditions, the adhesive mortar must retain body without segregating, and the RDP content is set at 2.5–3.8 wt% of dry mix, with 28–32 wt% CEM I 42.5 R, 58–64 wt% sand 0.1–0.6 mm, 5–10 wt% limestone filler, 0.3–0.5 wt% cellulose ether, 0.02–0.05 wt% starch ether, 0.01–0.03 wt% air-entraining agent, and 0.05–0.10 wt% of a synthetic rheology stabilizer to limit high-shear thinning. Dry-mix production is carried out in twin-shaft paddle mixers with 180–240 s homogenization and a product temperature below 45 °C; compliance for the system remains under EAD 040083-00-0404, and pump-quality control follows EN 1015-3:1999 flow table testing at the hopper discharge, with a target spread of 170–190 mm and a wet density of 1,550–1,700 kg/m³ per EN 1015-6:1998. Field operation of a PFT G4 or equivalent rotor-stator pump with a delivery pressure of 14–16 bar feeds the adhesive through a 25 mm hose to a spray nozzle at 300–400 mm stand-off distance; compressed air at 3–4 bar produces a ribbon width of 40–60 mm. Because machine shear can warm the mortar above 30 °C, the pump speed is limited to maintain discharge temperature below 35 °C to prevent premature RDP film formation; pot life at 23 °C is 90–120 minutes. The insulation board is pressed into the sprayed mortar within 5–8 minutes after application, and the terminal product is a 25 kg bagged machine-sprayable adhesive mortar for EPS and mineral wool ETICS installations, with the dry mix packaged in moisture-resistant bags suitable for direct hopper filling.
Cement hydration and polymer film formation follow competing kinetic paths when substrate temperature falls below 5 °C. For winter-grade insulation board adhesive mortars, the redispersible polymer powder must exhibit a minimum film formation temperature below 0 °C and a glass transition temperature below -10 °C; standard VAE grades with a MFFT above +4 °C fail to coalesce into continuous polymer films and leave a friable interface with the insulation board. The winter formulation increases RDP to 4.5–6.0 wt% of dry mix, combined with 32–36 wt% CEM I 52.5 N, 55–60 wt% sand 0.1–0.5 mm, 5–10 wt% limestone filler, 0.4–0.6 wt% cellulose ether, 0.1–0.2 wt% starch ether, and 0.5–1.5 wt% calcium formate accelerator to partially offset the retardation of alite hydration at low temperatures. The system must still be assessed under EAD 040083-00-0404 with tensile adhesion by EN 1015-12:2016, but additional low-temperature conditioning is specified at +5 °C and 60% RH for 28 days; published data for this specific conditioning configuration is limited, and batch qualification therefore relies on comparative control batches rather than extrapolation from 23 °C results. On dry-mix lines, the blend is produced with the same 45 °C temperature ceiling, but the accelerator content requires moisture protection below 0.25 wt% residual moisture to prevent barrel clumping. On site, mixing water is kept below 30 °C because warm water can cause localized RDP coalescence on powder particles before cement wetting; the fresh mortar is applied within 10 minutes, and board pressing must be completed before the adhesive surface skins under cold wind. The terminal material is a 25 kg winter-grade insulation board adhesive mortar for ETICS installation at air and substrate temperatures from +1 °C to +5 °C, with the limitation that overnight freezing during the first 24 hours can destroy film formation and tensile strength development.
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Redispersible polymer powder (RDP) for insulation board adhesive mortars is a spray-dried vinyl acetate-ethylene (VAE) copolymer powder supplied as a free-flowing white to light beige powder. A representative internal model designation is RDP-IB 702; commercial model codes vary, but insulation-adhesive grades are specified by low glass transition temperature, controlled redispersibility, and a protective polyvinyl alcohol colloid system that stabilises the powder during dry-mix storage. Typical specification bands for this class include bulk density 400–600 g/L, residual moisture ≤1.5 wt%, ash content 8–12 wt% as determined by ISO 3451-1:2019 method A, pH of a 10% aqueous dispersion 6.5–8.5, and minimum film-forming temperature (MFFT) 0–4 °C under ISO 2115:1996. Glass transition temperature measured by ISO 11357-2:2016 falls between -14 °C and -7 °C, placing the film in the soft regime needed for adhesion to low-polarity insulation boards.
The powder is used in dry-mix cementitious adhesives for external thermal insulation composite systems (ETICS) assessed under EN 13499:2003 and EAD 040083-00-0404. Expanded polystyrene (EPS), extruded polystyrene (XPS), mineral wool, and phenolic foam boards require a polymer-modified adhesive that transfers wind suction and service loads while remaining ductile enough to avoid crack propagation through the adhesive layer. The RDP phase contributes to wet-trowel workability, board wetting, early skin cohesion, and long-term adhesion after wet-dry and freeze-thaw cycling. Because cement hydration produces a rigid, capillary-porous matrix, the polymer film must bridge microcracks and reduce stress concentration at the insulation/mortar interface. In this respect, insulation-adhesive RDP differs from tile-adhesive VAE powders, which are often harder and optimised for ceramic substrates rather than low-modulus thermal insulation.
Insulation-adhesive RDP is differentiated in the dry state by higher ethylene comonomer content, typically 10–18 wt%, which lowers the glass transition temperature and gives permanent flexibility. General-purpose VAE powders for skim coats may have a Tg closer to 0 °C, whereas insulation-adhesive grades are maintained below -7 °C to preserve film elongation at low service temperatures. The MFFT is held at or below 4 °C so that polymer coalescence proceeds at installation temperatures down to approximately 5 °C. Below this temperature, hydration and film formation slow simultaneously; the operational boundary for most standard grades is therefore 5 °C board surface temperature. A winter-grade RDP with MFFT near 0 °C can lower the practical limit, but only when the cement system is adjusted with accelerators and the water demand is reduced.
Redispersibility is a further controlling parameter. The powder must redisperse into primary particles under low-shear hand or paddle mixing within 30 s; incomplete redispersion leaves viscous polymer agglomerates that produce visible lumps, reduce open time, and create weak planes in the hardened adhesive. Sieve residue on a 400 µm sieve is typically ≤2 wt% for insulation-adhesive grades, which is lower than many general-purpose powders because thin adhesive ribbons, often 5–10 mm, cannot hide coarse grit. Isolated film tensile strength after redispersion and drying at 23 °C and 50% RH is usually reported between 3 MPa and 6 MPa with elongation 250–600% using ISO 527-2:2012. The mortar matrix values are lower because of the brittle cement phase; published data for this specific configuration is limited, and absolute values depend on cement type, air content, and curing protocol.
The contribution of RDP-IB 702 to insulation adhesive performance occurs through three simultaneous mechanisms: air-void stabilisation, film formation at the insulation interface, and post-hydration polymer bridging across cementitious domains. In the wet-state rheology, a formulation with 2.0–3.0 wt% RDP and 0.35–0.50 wt% cellulose ether typically exhibits a Brookfield viscosity of 1,200–2,800 mPa·s at 20 rpm, with air content controlled between 12 vol% and 18 vol%. Air contents above 20 vol% are detrimental because the load-bearing area at the substrate decreases and the adhesive may fail cohesively under combined shear and vacuum wind loading. Air contents below 10 vol% produce a dense, viscous mix that is difficult to spread and has reduced freeze-thaw resistance.
The adhesive bond is formed by pressing the board into a ribbed mortar bed applied with a 10 mm or 12 mm notched trowel. After pressing, the mortar contact area should exceed 40% for fully bonded EPS boards; spot and perimeter bonding can use less area but changes the structural load path and requires separate assessment under ETICS design regulations. The VAE film wets the low-energy EPS surface only while the water phase remains available. Open time is therefore managed by cellulose ether dosage and is typically 20–30 min at 23 °C and 50% RH. At open windows beyond 30 min, the troweled ribs form a surface skin and the peel adhesion to freshly placed EPS drops sharply; if hot or windy conditions cause premature skinning, a higher MFFT polymer cannot compensate for the loss of surface water.
For production-scale dry-mix manufacture, the RDP component is metered at the final blending stage after cement, sand, cellulose ether, and fillers have been pre-mixed. In high-speed horizontal ploughshare mixers operated in batches of 300–800 kg, frictional heat generation can raise powder temperature above 60 °C; the protective polyvinyl alcohol colloid softens near 90–100 °C, but sustained temperatures above 60 °C during blending can increase caking tendency and reduce redispersibility. The production bulk temperature is therefore maintained below 60 °C and the powder is not exposed to steam cleaning lines or long residence times in warm silos. Dosing accuracy of ±0.2 wt% is required at low addition rates. A deviation of 0.5 wt% in RDP content changes air entrainment and the resulting adhesive pull-off; production records are linked to ISO 9001 batch traceability and calibrated weigh-belt or screw-feeder checks.
Packaging and storage also affect field performance. The powder is supplied in 25 kg valve bags or 1,000 kg bulk bags. Storage should be maintained at 5–35 °C and below 65% RH to avoid hydrolysis of the vinyl acetate units and blocking of the powder. Bulk silo storage is acceptable when dry air sweep is used and the product is not left for more than 6 months without rotation. High humidity above 70% RH during manual batching can increase lumping, particularly for low-MFFT grades, and is a known production bottleneck in tropical locations.
If extruded polystyrene (XPS) is substituted for EPS, the adhesive formulation requires a higher RDP dosage and a different wetting strategy because the closed XPS surface is denser and less absorbent. A VAE RDP content of 3.0–5.0 wt% is used for XPS adhesives, often with a copolymer layer having a Tg near -10 °C, and the fresh mortar is adjusted to lower yield stress so that the board can be pressed without excessive rebound. Some XPS boards carry a milled skin or flame-treated surface; if the surface is untreated, the adhesive may fail interfacially before reaching 0.08 MPa under ETAG 004 dry-condition pull-off. For mineral wool and wood-fibre boards, the limiting factor is not low surface energy but high water absorption, which pulls water out of the adhesive and prevents complete film coalescence. A fine-spray water pre-wetting or a primer can be required on highly absorbent boards; RDP selection alone cannot solve rapid dewatering.
At ambient board temperatures below 5 °C, standard VAE RDP films remain incompletely coalesced and the adhesive may pass dry pull-off but fail after water immersion because the film has not formed a continuous network. At temperatures above 35 °C and relative humidity below 30% RH, the open time shrinks below 10–15 min, and the polymer film may harden before board insertion, producing weak interface contact. The operational boundary for standard RDP-IB 702 is therefore board surface temperature 5–35 °C and relative humidity 30–70% RH. Outside this window, process adjustments such as shading, water misting, or accelerator additions are required. No RDP grade is a substitute for adequate curing conditions, though a low-MFFT grade shifts the lower-temperature limit slightly.
On the building facade, the adhesive rib pattern and board pressing sequence govern the final contact geometry. A 1 m × 0.5 m EPS board is typically pressed into place with a long magnesium float or straight edge. Immediate repositioning is possible for 5–10 min depending on open time, but the adhesive should not be re-troweled after a surface skin forms. Board joints must be free of adhesive squeeze-out because hardened polymer-cement bridges between boards create thermal breaks and can telegraph through the render. Excess mortar is removed before hydration reaches initial set, which occurs between 90 min and 180 min with a CEM I 42.5 R system at 20 °C. Mechanical fixings are installed after the adhesive has developed sufficient bearing strength, usually not earlier than 24 h at normal curing; this prevents board displacement and local interface cracking.
Compared with acrylic RDP, vinyl acetate-ethylene powder for insulation adhesives provides a balance of cost, adhesion to EPS, and cement compatibility. Acrylic RDP can offer higher UV resistance and better hydrolysis resistance in exterior exposure, but its dosage in cementitious adhesive may require 2.5–5.0 wt% to achieve similar flexibility, and some acrylic grades show greater air entrainment, which must be controlled with defoamers. Compared with a liquid styrene-butadiene rubber (SBR) latex used at a polymer-cement ratio of 0.10–0.20, the dry RDP eliminates on-site water dosing complications and reduces the risk of freezing during transport. Liquid SBR dispersions can form tough films above 5 °C, but their adhesive formulation requires careful foam control and storage above 5 °C because freezing coagulates the latex. RDP formulations are supplied as one-component dry mortar and require only water at the mixer; this simplifies production, transport, and site batching under UN packaging and labelling rules.
In comparison to ordinary cement-only adhesive mortars, the addition of 2.5 wt% RDP-IB 702 raises raw material cost but changes the failure mode from interface debonding to cohesive failure within the EPS. ETICS adhesive qualification expects the EPS board to fail cohesively in pull-off testing, with adhesion strengths above 0.08 MPa. Unmodified mortars often exceed 0.25 MPa on concrete but fail on EPS below 0.05 MPa because the rigid hydration paste cannot conform to the foam surface. The RDP decreases the elastic modulus of the adhesive from above 10 GPa for plain mortar to below 5 GPa at higher addition levels, which reduces differential stress between the rigid substrate and the low-modulus insulation layer. This modulus transition is one of the main technical reasons for specifying insulation-board adhesive RDP rather than a generic construction RDP. Polyvinyl acetate homopolymer or vinyl chloride copolymer powders are generally unsuitable for exterior ETICS because their wet adhesion after water immersion is lower and they are more sensitive to alkaline hydrolysis of the ester groups. When high early strength is also required, the formulator balances RDP dosage with a lower water-cement ratio and 0.05–0.10 wt% accelerator, but amine-based additives should be avoided because they can destabilise the protective colloid and reduce redispersibility.
