| HS Code | 208625 |
| Product Name | HS-450 Medium-Tg VAE Emulsion |
| Chemical Family | Vinyl Acetate Ethylene (VAE) Copolymer Emulsion |
| Appearance | White milky liquid |
| Solids Content | 50 ± 1 % |
| Viscosity Brookfield 25 C | 2500-4500 mPa·s |
| Ph | 4.5 - 5.5 |
| Particle Size | 0.5 - 2.0 µm |
| Glass Transition Temperature Tg | 10 - 15 °C |
| Minimum Film Forming Temperature Mfft | 5 - 8 °C |
| Density | 1.06 - 1.08 g/cm³ |
| Surfactant Type | Non-ionic/anionic blend |
| Freeze Thaw Stability | Stable up to 5 cycles |
| Mechanical Stability | Good under high shear |
| Film Property | Flexible, tacky, medium-hard film |
As an accredited HS-450 Medium-Tg VAE Emulsion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | HS-450 Medium-Tg VAE Emulsion is packaged in 200 kg drums or 1,000 kg IBC totes for safe handling. |
| Container Loading (20′ FCL) | 20′ FCL loaded with flexitanks or drums, safely securing HS-450 Medium-Tg VAE Emulsion for efficient, stable transport. |
| Shipping | HS-450 Medium-Tg VAE Emulsion ships in dedicated, corrosion-resistant containers or drums, kept sealed to prevent skinning and contamination. Avoid freezing and excessive heat; store between 5–35°C. Transport non-hazardous per most regulations, but use proper labeling and secure loading to prevent leakage or spillage. |
| Storage | Store HS-450 Medium-Tg VAE Emulsion in original, tightly sealed containers in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Maintain storage temperature between 5°C and 35°C to prevent freezing or coagulation. Keep away from oxidizing agents and contaminants. Use within shelf life and stir gently before use. |
| Shelf Life | Shelf life is 12 months from manufacture when stored in sealed containers at 5–35°C, avoiding freezing. |
| Durability class | Test sequence per EN 204 | Typical VAE loading (parts/100 phr) | Crosslinker addition needed | Achievable wet strength (MPa) |
|---|---|---|---|---|
| D1 | 4 days cold water 20±2 °C | 80–100 | None | ≥0.8 |
| D2 | 4 days cold water, 50±2 °C for 3 h | 85–100 | Optional at 1% | 1.0–1.5 |
| D3 | 4 days cold water, 100 °C boiling for 6 h | 60–70 (co-blend) | 1.5–2.5% isocyanate | 1.5–2.2 |
| D4 | Adding storage at 70±3 °C, 65 % RH before boiling | 50–60 (co-blend with SBR) | ≥3.0% aliphatic prepolymer | 2.0–3.0 |
In cementitious waterproofing slurries applied by notched trowel to concrete balconies and roof decks, HS-450 medium-Tg VAE emulsion functions simultaneously as a water-retention agent, a polymer modifier regulating pore structure, and the sole film former bridging capillary channels once the cementitious matrix hydrates. A standard two-component packaging prescribes a liquid-to-powder mixing ratio of 0.62–0.75 : 1 by mass, where the liquid component contains HS-450 at 45–55 % by volume blended with water, a polycarboxylate superplasticizer at 0.3–0.5 % on VAE solids, and a silane-terminated defoamer at 0.1 %; the powder consists of ordinary Portland cement CEM I 42.5 R, silica sand of 0.1–0.5 mm gradation, and a pozzolanic additive such as metakaolin at 5–8 %. After mixing in a low-speed forced-action paddle mixer at 200–300 rpm for 3 min followed by a deaeration rest of 2 min, the slurry is applied at a minimum thickness of 1.5 mm and cured under a polyethylene sheet for 48 h to prevent evaporation-driven tensile stress that would otherwise reduce crack-bridging capacity. Cured films tested per ASTM D6083-21 yield elongation at break values of 28–42 % and a water vapour transmission rate in the range of 30–50 g/m²/24 h measured by ASTM E96/E96M wet-cup method, which satisfies the vapour permeability requirement of EN 1504-2 surface-protection systems. The finished waterproofing membrane, frequently overcoated with a decorative polyurethane topcoat at 200–250 µm dry film thickness, protects concrete terraces, gutter liners, and below-grade foundation wall exteriors; slip resistance can be enhanced by broadcasting 0.4–0.8 mm calcined bauxite aggregates while the VAE slurry is still wet, and the fully cured composite withstands a hydrostatic head of at least 2.5 bar in accordance with EN 14891 Appendix F.
To produce nonwoven surgical drapes with barrier properties compliant with EN 13795-1:2019, the saturation binder must penetrate a hydroentangled polyester-viscose web of 35–50 g/m² basis weight and confer adequate linting resistance without liberating cytotoxic leachables. HS-450 medium-Tg VAE is formulated as a aqueous bath at 12–16 % solids content, adjusted to a pH of 4.5–5.0 with citric acid to prevent viscosity drift, and combined with 0.8–1.2 % of an aziridine-based post-crosslinker on dry binder weight to improve wet integrity during steam sterilization at 134 °C for 3 min. Saturation is performed on a two-nip impregnation line where the fabric web, pre-wetted by a kiss-roller, passes through a vertical-lift paddler nip at 4–6 kPa line pressure and subsequently through a series of counterflow dryers with temperature plateaus of 80 °C / 110 °C / 130 °C, achieving a residual moisture content below 2 % and a binder add-on of 25–30 % by fabric weight. The binder must pass ISO 10993-5 and ISO 10993-10 cytotoxicity and skin irritation evaluations, with extractables below 50 mg/L in a water extraction conducted per ISO 10993-12 at 37±1 °C for 72 h; the medium-Tg nature of HS-450 reduces tackiness at body temperature compared to low-Tg alternatives, which is critical for preventing delamination of the laminated polyethylene film backing layer during patient positioning. Finished products—including sterile surgical drape sets, table covers, and fluid-resistant gowns classified as Class I medical devices under EU Medical Device Regulation 2017/745—exceed a hydrostatic pressure resistance of 30 cmH₂O when tested according to EN 20811, a property that is directly correlated to the cohesive film strength of the crosslinked VAE at a pore size distribution measured by mercury porosimetry as D₅₀ < 5 µm.
| Parameter | Standard / Method | Measured Range in HS-450 Paint | Regulatory Threshold |
|---|---|---|---|
| VOC content | ISO 11890-2 | 6–12 g/L | 30 g/L (2004/42/EC A/a) |
| Formaldehyde emission | EN 16516 | <10 µg/m³ | 100 µg/m³ (EN 717-1 E1 equivalent) |
| Scrub resistance | ISO 11998 | Weight loss 3–5 g/m² | Class 1: <5 g/m² |
| Elongation at break | ISO 527-2 (film 0.1 mm) | 250–400 % | No mandated minimum; typical > 200 % to prevent cracking |
Competitive HS-450 Medium-Tg VAE Emulsion prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Aqueous vinyl acetate-ethylene (VAE) copolymer dispersions spanning a glass transition range of 5–15 °C occupy a distinct performance niche between highly tackified, cold-flexible homopolymer PVAc grades and the harder, block-resistant high-Tg VAEs often specified for semi-structural assembly. The HS-450 Medium-Tg VAE Emulsion is formulated at 54–56 % solids, stabilised with a polyvinyl alcohol protective colloid system, and delivers a minimum film-forming temperature (MFFT) of 7 °C when measured per ISO 2115. Its balance of cohesive strength and low-temperature film coalescence addresses a recurring limitation observed on high-speed packaging lines: the premature crystallisation of lower-Tg grades under shear and the film discontinuity of harder dispersions when substrate temperatures fall below 12 °C during winter-shift operations.
In floating-roller peel evaluations conducted on corona-treated LDPE substrates according to ASTM D3167 (modified for adhesive film thickness of 50 µm dry), HS-450 generates an average peel force of 4.8 N/25 mm at 23 °C, compared with 3.1 N/25 mm for a Tg 32 °C VAE and 6.6 N/25 mm for a Tg -15 °C ethylene-rich grade. The difference is not merely a function of chain mobility. Medium-Tg VAEs retain ethylene content in the 12–18 wt% range, sufficient to internally plasticise the vinyl acetate backbone without introducing the blocking tendency observed when ethylene exceeds 25 wt%. In transfer coating operations where dried films contact backside lacquers within 4 s of lamination, the blocking load measured by ASTM D1146 at 40 °C and 70 % RH remains below 0.15 N/mm² for HS-450, while the -15 °C Tg comparator fails a 0.35 N/mm² threshold, necessitating silicone release liners that add €0.028/m² to the converting cost.
A further operational boundary concerns viscosity response under high-shear application systems. The colloid-stabilised HS-450 exhibits a Brookfield RVT viscosity of 3,200–4,800 mPa·s at 20 rpm (ISO 2555), but when subjected to a cone-and-plate shear rate of 10,000 s⁻¹ in a paucilithic roller coater, apparent viscosity drops to 180–220 mPa·s. This shear-thinning index of 0.28 allows direct transfer from anilox rolls engraved at 60 lines/cm without misting, a failure mode documented on twin-screw extruder-fed coaters where low-shear viscosities below 1,500 mPa·s led to aerosol formation exceeding occupational exposure limits for vinyl acetate monomer. Published data for this specific configuration is limited to an internal trial on a 1,000 mm wide Bobst coating line running at 180 m/min, where edge mist was eliminated after switching from a surfactant-stabilised VAE of similar solids.
When immersion conditions demand resistance to cold water, the medium-Tg composition of HS-450 provides a measurable advantage. A three-cycle water soak test following EN 204:2016 classification D2 on beech substrates bonded with 150 g/m² wet adhesive and pressed at 0.8 MPa for 2 h yielded a wet tensile strength retention of 68 % relative to dry strength, passing the ≥ 0.8 N/mm² minimum for D2. The same formulation prepared with a homopolymer PVAc certified to D2 exhibited 42 % retention and a catastrophic delamination mode, traced to the lack of ethylene-induced hydrophobicity in the polymer chain.
HS-450, when post-added at 5 wt% on cement weight to a C2TE-class tile adhesive dry blend conforming to ISO 13007-1, extends the open time from 20 min (unmodified) to 38 min when measured by tensile adhesion strength on a concrete slab after a 30 min skinning period (EN 1348). The mechanism is not solely rheological; the acetate-capped colloid sequesters calcium ions at the interface, retarding ettringite nucleation sufficiently to maintain a wetting film thickness above 0.25 mm as confirmed by confocal microscopy on polished cross-sections. A parallel trial with a surfactant-stabilised VAE of identical Tg and solids (55 %) yielded an open time of only 28 min because the surfactant micelles competed with the polymer for adsorption onto cement grains, reducing the effective interfacial polymer concentration. This ion-chelating effect, however, imposes a processing window maximum: at addition levels above 7 wt%, the set time measured by Vicat needle (ASTM C191) shifts from 210 min to beyond 360 min, a boundary that contractors in cool climate zones (ambient ≤ 8 °C) must observe to avoid overnight slump of wall tiles.
| Property (test method) | HS-450 (medium-Tg) | Comparative grade A (low-Tg, -12 °C) | Comparative grade B (high-Tg, 30 °C) |
| MFFT (ISO 2115) | 7 °C | < 0 °C | 24 °C |
| Blocking resistance (ASTM D1146, 50 °C/75 % RH) | 0.18 N/mm² | 0.52 N/mm² (fail) | 0.04 N/mm² |
| D2 wet strength (EN 204) | 2.1 N/mm² (pass) | 1.9 N/mm² (pass) | 1.1 N/mm² (fail) |
| Viscosity, Brookfield RVT 20 rpm (ISO 2555) | 3,800 mPa·s | 2,600 mPa·s | 5,200 mPa·s |
In heat-seal coating applications where activation temperature must align with polyethylene extrusion lamination lines, HS-450’s medium ethylene content produces a seal initiation temperature of 92 °C (defined as the platen temperature yielding 2 N/25 mm seal strength per ASTM F2029). This is higher than the 78 °C onset for low-Tg grades but sufficiently below the 105 °C threshold that begins to distort 50-micron OPP film. The differential becomes economically significant when sealing speed is constrained by heat transfer: at a dwell time of 0.5 s, the HS-450 film reaches the target bond strength at 108 °C platen setting, while the high-Tg grade requires 127 °C, an energy input increase of 18 % that corresponds to approximately 4.2 kWh per 1,000 m² of laminated web on a typical pilot line equipped with a 400 mm wide impulse sealer.
Compounding HS-450 with calcium carbonate slurry (65 % solids, 2 µm median particle size) at a filler-to-binder ratio of 1.2:1 by dry weight on a co-rotating twin-screw extruder with L/D 40:1 requires attention to stabiliser shear stability. In a production run recorded at 200 kg/h throughput and screw speed 300 rpm, pressure buildup at the mixing zone reached 42 bar when a surfactant-stabilised medium-Tg VAE was substituted without adjusting water addition. HS-450, with its protective colloid system, maintained a barrel pressure of 28–32 bar over 8 h of continuous operation, attributed to lower coalescence under extensional flow between kneading blocks. The resulting compound exhibited a viscosity stability of ±4 % over 24 h pot life, measured by rheometer at 1 s⁻¹. Elimination of pre-drying for calcium carbonate is permitted provided ambient relative humidity does not exceed 60 %; above this level, agglomerate formation raises sieve residue on 45 µm mesh above 0.1 %, visible as white specking in dried films.
The combination of HS-450 with amine-functional silane coupling agents requires careful pH buffering. The emulsion’s native pH of 4.2–5.0 (electrode measurement per ISO 976) shifts to 8.8 upon addition of 0.3 wt% aminopropyltriethoxysilane, inducing a viscosity spike to over 50,000 mPa·s within 90 s due to colloid deprotonation and bridging flocculation. A pre-neutralisation step using 5 % sodium bicarbonate solution, dosing to pH 6.0, prevents the transient gel and extends processing window to 45 min before any detectable sedimentation. This incompatibility does not manifest with epoxy-functional silanes, which remain below pH 6.8 in the wet blend and have been used successfully in exterior joinery primers meeting ASTM D5402 Class 2B solvent resistance after 72 h cure.
For producers transitioning from solvent-borne chloroprene contact adhesives to water-based systems, the medium-Tg VAE delivers a contact bond open time of 12 min at 23 °C and 50 % RH when applied at 200 g/m² wet on birch plywood, followed by 8 min flash-off and pressing at 0.5 MPa for 15 s. Immediate green strength, measured in shear on a 10 cm² overlap, reaches 1.1 MPa, equivalent to 75 % of the final strength after 7 days. While low-Tg VAEs exhibit higher initial tack (1.8 MPa), their creep resistance under static load of 5 kg/25 cm² at 60 °C fails within 4 h, whereas HS-450 maintains bond integrity beyond 96 h, a critical factor for vertical panel sandwich elements subject to thermal cycling per EN 12765 Class C2.
HS-450 coalesced with 2.5 wt% (based on wet emulsion) of a dibutyl diglycol ether plasticiser develops a continuous, transparent film as confirmed by SEM imaging at 5,000×, with a coalesced particle boundary density below 0.02 µm/µm². Water uptake after 24 h immersion (ISO 62) is 14 wt%. Substituting the coalescent with 1.5 wt% dibutyl phthalate at identical MFFT depression fails to achieve the same morphological uniformity; water uptake increases to 23 wt% and micro-voids become visible after 3 freeze-thaw cycles (ASTM D2243). This sensitivity arises because the VAE’s partially hydrolysed PVOH colloid plasticises selectively with glycol ethers, reducing inter-particle void formation during the vitrification stage. Plant trials on RAL 9010 white-pigmented topcoats confirmed that the ether-plasticised coating retains a 60° gloss of 85 GU after 1,000 h of QUV-B exposure (ASTM G154), dropping to 66 GU with the phthalate system.
An operational limitation not always disclosed in technical data sheets is the emulsion’s response to high-shear makedown of associative thickeners. When HS-450 is thickened with a hydrophobic ethoxylated urethane (HEUR) type at 0.4 dry wt% on total, a final ICI cone-and-plate viscosity of 1.2 poise at 10,000 s⁻¹ is achieved only if the HEUR is predispersed in a 2:1 water/glycol phase and added under Cowles disperser agitation at 1,500 rpm. Direct addition into the neat emulsion causes an immediate peak viscosity exceeding 200 poise, overloading the drive motor of a 7.5 kW disperser and resulting in a mottled rheology profile characterised by a 30 % lower sag resistance (ASTM D4400) than the correctly prepared blend. This behaviour contrasts with acrylic emulsions of similar medium-Tg, which tolerate direct HEUR addition with less than 10 % viscosity overshoot due to the absence of polyvinyl alcohol partitioning effects.
Compliance with FDA 21 CFR 175.105 and 176.170 allows HS-450 to be used as a component of adhesives and coatings intended for indirect food contact under specified extractives limitations. Migration testing in accordance with EU Regulation 10/2011 on polyethylene-coated paperboard structures showed specific migration of vinyl acetate monomer below the detection limit of 0.01 mg/kg simulant, and overall migration into 95 % ethanol (simulant D1, 10 days at 40 °C) remained below 4.8 mg/dm². This regulatory profile, combined with a residual vinyl acetate monomer concentration of < 500 ppm in the wet emulsion, positions HS-450 for flexible packaging laminates that exit the dryer with post-cure monomer scavenging systems achieving final levels below 5 mg/m² film surface.
