| HS Code | 437414 |
| Productname | EDTA ZnNa2 |
| Chemicalname | Disodium zinc ethylenediaminetetraacetate |
| Synonyms | Zinc disodium EDTA; Ethylenediaminetetraacetic acid zinc disodium salt |
| Casnumber | 14025-21-9 |
| Einecs | 237-865-4 |
| Molecularformula | C10H12N2Na2O8Zn |
| Molecularweight | 399.57 g/mol |
| Appearance | White to off-white powder |
| Odor | Odorless |
| Watersolubility | Soluble in water; insoluble in alcohol |
| Ph | 6.5-7.5 (1% aqueous solution) |
| Zinccontent | 15.5-16.5% |
| Assay | ≥99.0% |
| Storage | Store in a cool, dry, well-ventilated area |
| Stability | Stable under normal conditions |
As an accredited EDTA ZnNa2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EDTA ZnNa2 is supplied in 25 kg net weight, polyethylene-lined fiber drums with sealed, moisture-resistant inner liners for safe storage. |
| Container Loading (20′ FCL) | EDTA ZnNa2 cargo loaded in a 20′ FCL container, palletized, shrink-wrapped, secured, and shipped with proper documentation in dry conditions. |
| Shipping | EDTA ZnNa2 (disodium zinc ethylenediaminetetraacetate) is generally shipped as a non-regulated, non-dangerous solid. No UN number, hazard class, or packing group normally applies. Use sealed, labeled containers, keep dry, and avoid incompatible oxidizers. Always confirm current SDS and ADR/IMDG/IATA requirements, as environmental classification may vary. |
| Storage | Store EDTA ZnNa2 in a cool, dry, well-ventilated area away from direct sunlight, heat, and moisture. Keep containers tightly closed, clearly labeled, and upright. Protect from dust and incompatible substances such as strong oxidizers. Use appropriate secondary containment to prevent spills. Keep away from food, drink, and animal feed. Follow local regulations and the SDS. |
| Shelf Life | EDTA ZnNa2 shelf life: typically several years if stored dry, tightly sealed, at room temperature, protected from moisture, heat, and light. |
In orchard soils where pH remains within 7.8–8.5 and bicarbonate alkalinity exceeds 5.0 mmol/L, zinc supplied as sulfate rapidly hydrolyzes to zinc hydroxide and coprecipitates with calcium carbonate or adsorbs onto limestone surfaces; leaf zinc concentrations in such blocks can remain below 20 mg/kg dry matter despite repeated soil applications. Zinc disodium EDTA changes this availability threshold because the zinc-EDTA chelate remains soluble across the pH range 4.0–9.0 and resists displacement by calcium in hard irrigation water. The conditional stability constant of zinc-EDTA is reported at 16.5 under 25 °C and 0.1 M ionic strength, which keeps the chelated fraction dominant even when calcium concentration exceeds 200 mg/L. Foliar application of zinc disodium EDTA is used on grapevine, citrus, almond, and avocado blocks where shortened internodes and interveinal chlorosis indicate zinc deficiency. Critical leaf thresholds vary by crop and phenological stage; for grapevine, zinc sufficiency is commonly reported between 25–50 mg/kg, but local leaf sampling protocols determine interpretation. The material is not a replacement for soil pH correction or drainage improvement, but it provides a targeted correction window during periods of high shoot demand.
Formulation addition rates for foliar products containing 15.0% w/w zinc as zinc disodium EDTA typically range from 1.0–3.0 kg product/ha per season, divided into 2–4 spray events, equivalent to 150–450 g Zn/ha per season. Spray-tank concentrations are commonly 0.1–0.5% w/v product in 500–1000 L/ha water; the upper end is reserved for severe deficiency or heavily shaded canopies. In drip-irrigated orchard systems, a pulsed fertigation approach uses 0.5–1.5 mg Zn/L in the final irrigation water, but the chelate is not injected into raw water carrying bicarbonate above 8.0 mmol/L without first suppressing pH to 6.0–6.5, because carbonate scale formation reduces emitter life and distribution uniformity. Tank mixing with orthophosphate fertilizers should be avoided when phosphate concentration exceeds 80 mg/L P2O5; even chelated zinc can precipitate as zinc phosphate under that condition. A jar test using actual irrigation water at the proposed injection ratio is the minimum acceptance gate for a new formulation.
Downstream manufacturing of water-soluble foliar powders involves dry blending zinc disodium EDTA with potassium nitrate, urea, magnesium sulfate, boric acid, and nonionic wetting agents in ploughshare mixers operating at 80–120 rpm rotor speed for 8–15 minutes. Liquid formulations are produced by dissolving the chelate in deionized water at 40–50 °C, then adding anti-foam and polysorbate-type wetting agents after full solvation. The liquid concentrate is filtered through 10 µm bag filters before filling. Sodium molybdate or sodium humate additions may shift pH; adjustment to 6.5–7.5 is typical for storage stability. Field application equipment includes air-assisted orchard sprayers delivering 500–1000 L/ha and diaphragm injection pumps with 1:100 to 1:400 proportional dosing. Batch-to-batch variance is controlled by chelated zinc fraction testing per EN 13366:2001, not by total zinc alone, because total zinc may include unchelated residues that fail in calcareous water.
Regulatory compliance in the EU falls under Regulation (EU) 2019/1009, which requires chelated micronutrients to remain stable for a defined period and the chelating agent to be declared; zinc disodium EDTA is accepted under this framework when the label states chelated zinc content and pH stability range. In the U.S., state fertilizer registrations require total zinc and chelated zinc guarantees; analytical verification uses EN 13366:2001 and ISO 11885:2007. Terminal product types include water-soluble foliar powders, suspension-free foliar concentrates, and liquid starter fertilizers for drip systems. The operational boundary is narrow below soil pH 5.0, where zinc release from the chelate accelerates and pulsed doses can stress sensitive rootstocks; soil pH below 5.5 should be corrected before relying on zinc disodium EDTA as the sole zinc source.
| Application | Regulatory or standard reference | Analytical or performance boundary |
|---|---|---|
| Foliar and fertigation | Regulation (EU) 2019/1009, EN 13366:2001 | Chelated zinc fraction; pH stability range |
| Hydroponic solutions | ISO 11885:2007, ISO 17294-2:2016 | Total zinc in stock and drain solution |
| Automatic dishwashing | (EC) No 648/2004, IEC 60436:2015, (EU) 2017/1217 | Glass protection after repeated cycles; wastewater zinc |
| Cosmetic preservation | (EC) No 1223/2009, ISO 11930:2019, ISO 17516:2014 | Microbial challenge test; chelate stability in formula |
Where raw water bicarbonate concentration exceeds 5.0 mmol/L, zinc disodium EDTA is dosed into soilless vegetable and cut-flower fertigation lines because zinc sulfate would be trapped as insoluble zinc carbonate in distribution lines or growing media. The chelated form is introduced at 0.5–1.5 mg Zn/L in the final irrigation stream; over a 90–120 day crop cycle this corresponds to 0.8–2.4 kg product/ha when the product contains 15.0% w/w zinc. In concentrated stock tanks, the addition is calculated to maintain 100–200 g/L product, with the stock solution metered at 1:200 to 1:400 through diaphragm or venturi injectors. Zinc disodium EDTA is compatible with potassium nitrate and magnesium sulfate in the micro-nutrient tank but is normally separated from calcium nitrate in a two-tank system; combining concentrated calcium nitrate with a zinc-EDTA and sulfate stock can exceed the solubility product for calcium sulfate and create clogging in solenoid valves and pressure-compensating drippers. Tomato, cucumber, and sweet pepper lines are often held near 0.5 mg Zn/L in closed-loop systems, while rose and gerbera lines may run at 1.0–1.2 mg Zn/L because of higher vegetative removal. Published data for crop-specific removal is variable; drain solution zinc is monitored at 7-day intervals by ISO 11885:2007 ICP-OES because chelated zinc can accumulate in recirculating systems if uptake is suppressed by elevated iron or manganese competition.
Production of liquid fertigation concentrates starts with deionized or reverse-osmosis water at 40–50 °C. Zinc disodium EDTA is added first to avoid ligand exchange with sulfate or phosphate later in the sequence. The pH is adjusted to 6.5–7.5 with citric acid or potassium hydroxide before adding urea and potassium nitrate, because urea dissolution can depress pH and shift zinc speciation. Downstream processing uses inline static mixers and 0.45–0.80 µm cartridge filtration before filling into 20 L or 1000 L IBC packs. Terminal product types include liquid starter fertilizers for transplanting, two-part A/B vegetable concentrates, and irrigation water conditioners used by greenhouse operations. Compliance in the EU requires conformity with Regulation (EU) 2019/1009 and EN 13366:2001 for chelated zinc quality control; REACH registration dossiers must cover the zinc disodium EDTA substance identity and use exposure scenarios. A practical limitation occurs in high-sulfate irrigation water: sulfate above 200 mg/L combined with calcium above 150 mg/L can form gypsum scale after injection even when the chelate itself remains soluble. Chelated zinc does not prevent calcium sulfate precipitation, and descaling alone does not restore a clogged dripper.
Hydroponic nutrient formulations use zinc disodium EDTA as the zinc source in concentrated stock solutions because it avoids precipitation in the presence of phosphate and sulfate at stock pH 5.8–6.2. Final working solutions are maintained at 0.05–0.25 mg Zn/L; commercial lettuce and leafy-green lines typically operate at 0.05–0.10 mg/L, while fruiting crops such as tomato and cucumber are maintained at 0.10–0.20 mg/L. In a 100x stock solution, the corresponding zinc concentration is 5–25 mg/L, measured by ISO 11885:2007 or ISO 17294-2:2016 after acid digestion. The concentration must be controlled within a narrow band because deficiency appears as chlorotic new growth below 0.03 mg/L, while zinc toxicity can suppress root elongation above 1.0 mg/L in sensitive crops. The chelate remains stable in final solution pH 4.5–9.0, but stock solutions should not be stored above pH 7.0 because prolonged UV exposure and elevated temperature degrade EDTA and reduce measured chelated zinc fraction.
Stock solution preparation for two-part hydroponic lines places zinc disodium EDTA in the micro-nutrient or B tank together with manganese EDTA, copper EDTA, boric acid, and sodium molybdate. Separating the calcium nitrate tank prevents calcium sulfate and calcium phosphate precipitation. The B stock is prepared with reverse-osmosis water at 30–40 °C; zinc disodium EDTA is dissolved before any potassium silicate addition, and silicate is never added to concentrated stock because it can form zinc silicate nucleation sites that pass through 5 µm filters and later bind to dripper biofilms. Production equipment includes high-shear mixing tanks with 1200–1500 rpm disperser speed for 10–15 minutes, followed by membrane filtration at 0.45 µm. Terminal products include one-part liquid nutrient A/B lines, powder blends for greenhouse lettuce, and hydroponic salt kits for controlled-environment agriculture. Compliance with Regulation (EU) 2019/1009 applies to CE-marked fertilising products; internal quality control uses EN 13366:2001 to quantify chelated zinc fraction after storage and ISO 11885:2007 for final solution verification. In aeroponic systems, nozzle orifices below 0.3 mm can clog if stock pH rises above 7.5; daily pH logging and 0.45 µm filtration are required operating limits.
Automatic dishwashing formulations that operate without phosphate builders use high-alkali carbonate and citrate systems that can strip silicate from glass surfaces over repeated cycles, producing iridescent haze and reduced glass strength. Zinc ions are introduced as a sacrificial glass-corrosion inhibitor because zinc adsorption and incorporation into the silicate surface reduces alkaline attack; zinc disodium EDTA provides zinc in a controlled form and prevents premature precipitation of zinc carbonate or zinc hydroxide in the wash bath. In tablet compositions, zinc disodium EDTA is added at 0.2–0.8 wt% of the tablet mass, equivalent to 0.03–0.13 wt% metallic zinc in the formulation. The free zinc concentration in wash liquor is typically targeted at 1–10 mg/L over a 55–65 °C cycle, measured after detergent dissolution and before the final rinse. The addition range is asymmetric: below 0.2 wt% the glass protection effect is not observable after 100 cycles under IEC 60436:2015, while above 0.8 wt% zinc may deposit on stainless steel cutlery as a blue-grey film and increase raw-material cost without improving glass protection. Published data for this specific zinc salt in household dishwasher testing is limited, so each formulation must validate glass protection with the standard test method using glass tumblers and evaluate stainless steel cutlery corrosion in the same trial.
Production of zinc disodium EDTA-containing dishwasher tablets involves dry blending the chelate with sodium carbonate, sodium percarbonate, citrate, polymer dispersants, and bleach activators in a ploughshare mixer with 80–120 rpm rotor speed. Nonionic surfactants are sprayed onto the moving powder bed at 40–50 °C to avoid localized gel formation. The resulting granulate is compressed on rotary tablet presses at 10–30 kN compression force to produce tablets with hardness 80–150 N and friability below 0.5%. Moisture pickup during compression is controlled below 2.0% w/w because EDTA salts can hydrate and soften the tablet; the compression room is maintained at 20–25 °C and 30–40% RH. Gel-pack and pouch products incorporate the chelate into a liquid or paste phase at 0.15–0.50 wt% after dissolving in propylene glycol or glycerin, then encapsulate in polyvinyl alcohol film. Terminal product types include all-in-one phosphate-free dishwasher tablets, multifunctional tabs with rinse aid and salt functions, and soluble film packs for household use. Compliance includes the EU Detergents Regulation (EC) No 648/2004 for ingredient declaration, IEC 60436:2015 for glass-care performance, and EU Ecolabel criteria for machine dishwashing detergents under Commission Decision (EU) 2017/1217. The operational boundary is set by local wastewater discharge limits for zinc; some municipal pretreatment programs limit zinc to 1.0–5.0 mg/L in industrial effluent, so institutional and hospitality installations must review combined wastewater release.
Formulation incompatibility arises with strong oxidizing agents in low-pH chlorine-release tabs because free EDTA can be oxidized by hypochlorite; zinc disodium EDTA is therefore used in percarbonate-based systems rather than chlorine-release systems unless the tablet is layered and separated. The chelate also competes with calcium and magnesium in hard water; at water hardness above 4.0 mmol/L CaCO3, the chelated zinc fraction can be partially displaced by calcium, reducing free zinc in the initial wash phase and requiring the upper part of the addition range. The product is not effective as a primary builder or bleach activator; its function is limited to metal-ion control and glass surface protection in a complete detergent matrix.
When trace transition metals from raw materials, water, and stainless-steel processing equipment destabilize cosmetic preservative systems, zinc disodium EDTA is introduced into the water phase at 0.05–0.20 wt% as supplied. The lower end is sufficient for municipal water with total hardness below 150 mg/L CaCO3, while the upper end is reserved for formulations with high botanical extract loads or natural pigments that release iron, copper, and manganese. In emulsions, the chelate is dissolved in the water phase at 40–50 °C before adding carbomer or xanthan gum, because adding it after polymer hydration can cause localized cation displacement and viscosity loss. The pH is adjusted after complete hydration to 5.0–6.5 with triethanolamine or sodium hydroxide; above pH 7.5, zinc disodium EDTA can release zinc ion, which interacts with cationic polymers in conditioning shampoos and with some anionic surfactant systems. Terminal product types include shampoos, sulfate-free body washes, facial cleansing gels, water-based serums, and preserved lotions where metal-catalyzed oxidation of fragrances and tocopherol is a batch failure risk.
Manufacturing lines for these products use vacuum-emulsifying mixers with counter-rotating anchor and disperser blades. Zinc disodium EDTA is added to deionized water at 40–50 °C under moderate anchor speed of 25–40 rpm; high-shear dispersion is unnecessary for this raw material and can entrain air that later degrades preservatives. The batch record must fix the addition sequence: EDTA chelate before thickener, then humectant, then preservative. The finished formulation is tested for microbiological stability according to ISO 11930:2019 and ISO 17516:2014; challenge testing confirms that the preservative system remains effective in the presence of the chelate. Regulatory compliance in the EU falls under Regulation (EC) No 1223/2009; the ingredient must be listed as Disodium Zinc EDTA in INCI nomenclature, and the safety assessment must address zinc as an intentionally added metal source. Production site GMP compliance follows ISO 22716:2007, particularly for segregation from other reactive metal salts. Operational limitations include incompatibility with aluminum chlorohydrate in anhydrous or low-water antiperspirant sticks, because the chelate can sequester aluminum and reduce efficacy. Zinc disodium EDTA is not recommended for anhydrous systems or for formulations with high concentrations of cationic conditioning polymers without prior batch stability testing at 45 °C for 90 days.
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Disodium zinc ethylenediaminetetraacetate, designated EDTA ZnNa₂ or Zn-EDTA, is a crystalline coordination compound in which the hexadentate ligand ethylenediaminetetraacetate occupies four carboxylate oxygen and two amine nitrogen coordination sites around a central zinc(II) ion. The resulting [Zn(EDTA)]²⁻ complex is charge-neutralized by two sodium cations. The CAS registry number is 14025-21-9 and the EC number is 237-865-0. The anhydrous form has molecular formula C10H12N2Na2O8Zn and molecular weight 399.56 g/mol. The dihydrate, C10H12N2Na2O8Zn·2H2O, has molecular weight 435.56 g/mol and theoretical zinc content 15.0% w/w; the anhydrous material contains 16.4% w/w zinc. The compound is freely soluble in water and practically insoluble in non-polar solvents.
There is no universal model-number scheme for this compound across global suppliers. Ordering specifications instead use grade designation, hydration state, zinc content, chelated fraction, and residual heavy-metal ceiling. Typical grade identifiers are “disodium zinc EDTA dihydrate technical,” “Zn-EDTA 15%,” and “cosmetic-grade disodium zinc EDTA.” Low-heavy-metal grade is usually screened through 250 µm mesh and controlled to As ≤ 3 mg/kg, Pb ≤ 10 mg/kg, Cd ≤ 5 mg/kg.
The controlling specifications for dihydrate technical material are given in the following table. Values are typical and should be verified against the supplier certificate of analysis for the specific batch.
| Parameter | Typical range for dihydrate technical grade | Reference method |
|---|---|---|
| Zinc content as Zn | 14.5–15.2% w/w | EN 16965 flame atomic absorption spectrometry |
| Chelated zinc fraction | ≥ 95% | EN 13366 cation-exchange resin |
| Water content | ≤ 9.0% | ISO 760 Karl Fischer |
| pH, 1% aqueous at 25 °C | 6.0–8.0 | potentiometric |
| Water-insoluble matter | ≤ 0.05% | gravimetric, 0.45 µm filter |
| Appearance | white to off-white crystalline powder | visual |
The chelated zinc fraction is the legally controlling specification for fertilizer use. Under Regulation (EU) 2019/1009, micronutrient chelates are evaluated by the cation-exchange resin method of EN 13366, which separates free or weakly bound Zn²⁺ from the anionic [Zn(EDTA)]²⁻ complex. A total zinc assay by EN 16965 is not sufficient for chelated-micronutrient label claims because it does not distinguish soluble ionic zinc from ligand-bound zinc.
Because the dihydrate contains 15.0% w/w zinc, each 1.0 kg of product supplies 150 g of zinc. A target final nutrient concentration of 1.0 mg/L Zn in a 1,000 L batch requires 6.7 g of product. A 10% w/w stock solution contains 15 g Zn/L; injection at 1:100 into irrigation water delivers 150 mg Zn/L before further dilution. These calculations assume the full zinc content is soluble and chelated. If the chelated zinc fraction falls below 95%, free zinc under hard water conditions may form zinc hydroxide or carbonate and clog drip emitters.
In fertigation and hydroponic stock solutions, EDTA ZnNa₂ is introduced through venturi injectors, diaphragm metering pumps, or proportional dosing systems at dilution ratios between 1:100 and 1:500. A 10% w/w stock solution prepared in soft water remains free of crystalline precipitation at 20 °C when pH is held between 5.5 and 7.0. Bicarbonate alkalinity above 150 mg/L as CaCO₃ combined with pH above 7.5 creates a tendency for calcium carbonate scaling that can entrain zinc chelate and reduce injector line diameter in continuous systems. Normal practice in such water is acidification with citric acid or nitric acid to pH 5.8–6.2 before chelate injection. The product should not be mixed in concentrated form with high-phosphate stocks above 50 mg/L phosphate because localized pH and ionic strength changes can reduce the conditional stability margin.
Stock solution preparation is not simply a hydration step. The powder should be added slowly to the vortex of a high-shear mixer operating at 500–1,000 rpm or through an eductor; dumping into static hard water can cause transient zinc hydroxide formation. In 1,000 L tanks, a typical hydration time at 20 °C is 15–30 min with recirculation through a 50 µm cartridge filter. The final stock should be drawn only after a clear solution is obtained; undissolved fines from the 250–425 µm size cut can plug drip emitters if filtration is omitted.
The stability constant of the [Zn(EDTA)]²⁻ complex is log K = 16.5 at 25 °C and 0.1 M ionic strength. The competing Ca-EDTA complex has log K = 10.7; zinc is not displaced by calcium at equimolar concentrations. Ferric iron forms a stronger complex with log K = 25.1. In irrigation water with soluble iron above 1–2 mg/L, Fe(III) can compete for the ligand, particularly under oxidizing conditions where ferrous iron is converted to ferric iron. The practical upper pH window for clear stock solutions is 7.5; above this value hydrolysis, carbonate precipitation, and calcium competition narrow the safety margin. Below pH 3.0, protonation of carboxylate donor groups releases Zn²⁺, making the product unsuitable for acid-only concentrates.
In soil application, the behavior differs from inorganic zinc salts in alkaline calcareous soils. A soil with pH 8.2 and calcium carbonate equivalent 15% can immobilize unchelated Zn²⁺ as zinc carbonate or zinc hydroxide within the first 10–20 mm of the application band; the anionic chelate moves further in the soil solution and remains plant-available for a longer interval. The complex is not immune to displacement under reducing conditions where Fe(II) concentrations rise, because the conditional stability gap narrows in anaerobic soil solution. Published data for this specific configuration is limited, and soil redox potential should be monitored in field trials.
Zinc sulfate monohydrate supplies 36.4% w/w zinc and zinc gluconate supplies 14.3% w/w zinc, but both release free or weakly complexed Zn²⁺ in solution. In hard water containing 250 mg/L bicarbonate, zinc sulfate forms zinc carbonate or hydroxide particulates above pH 7.0, while the anionic [Zn(EDTA)]²⁻ complex resists particulate formation until approximately pH 7.5–8.0 under otherwise identical conditions. In high-phytate matrices, Zn²⁺ is bound by phytate and becomes sparingly available; the EDTA complex is used in selected nutritional fortification strategies to maintain metal solubility because the ligand occupies the inner coordination sphere. The trade-off is lower zinc density per unit mass and higher molecular weight than zinc sulfate.
Disodium EDTA and tetrasodium EDTA are free-ligand salts that sequester hardness ions; EDTA ZnNa₂ already carries a coordinated zinc center and should not be selected when the formulation objective is removal of calcium or magnesium from process water. The zinc complex can exchange with Fe(III) because of the higher stability constant, but the displacement is not rapid at ambient temperature. In alkaline derusting tanks at 60–80 °C, the compound provides a source of reserve chelating capacity only after the zinc center is exchanged by more strongly bound metal ions such as Fe(III). This replacement occurs stoichiometrically and is not regenerative under typical tank operation. In metal surface conditioning, typical use levels are 0.2–2.0% w/w where controlled zinc activity is required.
In personal-care formulations, low-heavy-metal EDTA ZnNa₂ is used at 0.05–0.2% w/w as a chelating agent and zinc-release system in oral rinses and antiperspirant systems, where the anionic complex reduces redox metal activity. Preservation efficacy testing should be performed according to ISO 11930:2019 because the complex can alter the availability of metal ions that affect microbial growth.
EDTA-based ligands are susceptible to oxidative destruction by sodium hypochlorite, ozone, hydrogen peroxide, and peracetic acid. In a liquid cleaner containing 5–8% w/w sodium hypochlorite at pH 10.5–12.0, the chelating capacity of EDTA ZnNa₂ is consumed over hours to days at 25 °C, with the ligand backbone cleaved and zinc released into the alkaline matrix as zinc hydroxide. Formulations combining the chelate with chlorine-releasing agents therefore require isolation or sequential use. Stability trials should include iodometric titration of free chlorine and membrane filtration for precipitated zinc hydroxide. Avoid compounding with amine-based accelerators that can coordinate zinc and alter the ligand exchange equilibrium.
Storage in sealed HDPE drums at ≤ 30 °C and RH ≤ 60% preserves flow. Above 70% RH, the dihydrate absorbs moisture and cakes; pneumatic conveying of pre-dried material should use 316L stainless steel or polypropylene contact surfaces. The substance is registered under REACH; end users must verify the current harmonized classification and any local volatile organic compound restrictions for downstream formulations.
