Mob.:
+86 156 3115 5652
Mob.:
+86 156 3115 5652
E-mail:
thinkdo_calvin@126.com/thinkdochem@126.com
Mob.:
+86 156 3115 5652
Mob.:
+86 156 3115 5652
E-mail:
thinkdo_calvin@126.com/thinkdochem@126.com
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MGDA-3Na 40% is an aqueous solution of trisodium methylglycine diacetate, a biodegradable aminocarboxylate chelating agent used to bind calcium, magnesium, iron, and other metal ions. When I evaluate an MGDA-3Na 40% specification, I check five areas first: the active-content basis, pH measurement method, NTA and impurity limits, physical properties such as density and color, and the supplier’s batch documentation.
Confirm that “40%” means active MGDA-3Na content, not total solids or an undisclosed concentration basis.
Check pH using the stated dilution, typically a 1% aqueous solution.
Review NTA, chloride, residual raw materials, and other impurity limits.
Compare appearance, color, density, and sediment requirements with your formulation needs.
Request a batch-specific COA, TDS, SDS, compliance records, and export documents before purchase.
MGDA-3Na is the trisodium salt of methylglycine diacetic acid, also described as N,N-bis(carboxymethyl)alanine trisodium salt or trisodium dicarboxymethyl alaninate. The commonly referenced CAS number is 164462-16-2, while the anhydrous molecular formula is generally listed as C₇H₈NNa₃O₆, with a molecular weight of approximately 271.11 g/mol. However, buyers should confirm whether a supplier is describing the anhydrous compound, a hydrate, or a commercial aqueous solution.
The “40%” designation normally refers to a liquid product containing approximately 40% active MGDA-3Na in water. The remaining portion is primarily water and may include trace inorganic salts or process residues within the agreed specification. I do not treat “40% solution” as sufficient evidence of purity until the supplier identifies the test method, calculation basis, and batch result.
MGDA works by coordinating metal ions through its carboxylate and nitrogen-containing functional groups. In detergents and industrial cleaners, this action helps control calcium and magnesium from hard water, while in water treatment it can reduce the availability of metal ions that contribute to deposits, discoloration, or formulation instability.
A specification sheet should separate guaranteed release limits from typical descriptive values. A guaranteed limit is a contractual quality requirement that the manufacturer must meet for each batch, while a typical value describes expected production performance but may not provide the same purchasing protection.
The following parameters are commonly reviewed for a liquid MGDA-3Na 40% grade:
| Parameter | Example specification or requirement | Why buyers should check it |
|---|---|---|
| Appearance | Light yellow transparent liquid | Identifies sediment, phase separation, or abnormal discoloration |
| Active content | ≥40.0% | Establishes the usable chelant concentration |
| Chloride ion | ≤3.0% | Indicates inorganic salt burden and formulation impact |
| Density at 20°C | ≥1.30 g/cm³ | Supports dosing calculations and batch consistency |
| pH | 10.0–12.0 in a 1% aqueous solution | Confirms alkalinity using a defined test basis |
| NTA or related impurities | Buyer-specific limit required | Helps control residual process components |
| Sediment | Typically absent or controlled by agreement | Important for pumps, filters, and clear liquid products |
| Color | Defined visually or by instrumental method | Relevant to personal care, detergents, and export grades |
The values above should not automatically be treated as universal industry limits. For example, a buyer producing a clear personal-care formulation may require tighter color and sediment limits than a purchaser using MGDA in an alkaline industrial cleaner. I recommend placing the agreed values directly on the purchase specification and ensuring that the COA uses the same units and test basis.
MGDA-3Na active content is the most important commercial parameter because it determines how much usable chelating agent is delivered in each kilogram of product. A quotation based only on price per metric ton can be misleading when suppliers use different concentration bases, hydrated forms, or total-solids calculations.
I first ask the supplier to define “content” in writing. The specification should state whether the result is reported as MGDA-3Na, active matter, dry basis, or a titratable equivalent. The analytical method should also be identified, because a titration result and a solids measurement do not necessarily represent the same value.
For a 40% liquid grade, the COA should show the batch result rather than only printing “qualified.” A practical COA entry would include the lot number, production date, test date, result such as 40.3%, specification of ≥40.0%, and the applicable method. If the supplier reports 40% total solids but does not confirm MGDA-3Na content, I treat the document as incomplete.
I also compare active content with density when calculating delivered value. For example, if one supplier offers a liquid at 40.0% active content and another offers 42.0%, the second product may provide more chelant per container, but the comparison must include price, density, freight, handling, and shelf life. The relevant commercial metric is often cost per kilogram of active MGDA-3Na, not cost per kilogram of solution.
The MGDA-3Na pH and appearance specification affects storage, dosing, compatibility, and final-product appearance. A typical liquid specification from Think-Do Chemicals describes a light yellow transparent liquid, a pH of 10.0–12.0 when tested as a 1% aqueous solution, and density at 20°C of at least 1.30 g/cm³.
The pH result is meaningful only when the dilution is stated. A direct measurement of the concentrated product will not be equivalent to a measurement of a 1% solution, so I reject COAs that list pH without identifying the test concentration and temperature. Buyers should also confirm whether the pH range is a release limit or merely a typical production range.
Appearance should be defined with practical language. “Clear liquid” may not specify whether slight haze, suspended particles, or sediment are acceptable, while “light yellow transparent liquid, free from visible sediment” gives warehouse and quality-control teams a clearer acceptance standard.
Density is useful for both quality control and formulation engineering. A change in density can indicate concentration variation, evaporation, dilution, or an altered salt profile, although density alone cannot prove active content. I use density as a secondary check alongside active-content testing rather than as a substitute for chemical analysis.
NTA content deserves special attention because MGDA production can involve related aminocarboxylate intermediates or residual materials. A supplier that does not list an NTA limit may still have acceptable material, but the buyer lacks a clear basis for comparing batches or approving the product for applications with restricted impurity profiles.
I ask for the NTA test method, reporting unit, detection limit, and guaranteed maximum. The same request applies to chloride, free alkalinity, residual raw materials, heavy metals, and any application-specific contaminants. A limit such as chloride ≤3.0% may be suitable for one industrial application but too broad for a formulation where ionic strength affects viscosity, preservation, or surfactant behavior.
For detergents, chloride and inorganic salts can influence water balance, viscosity, and compatibility with other builders. For personal care products, color, odor, trace metals, and microbial controls may require additional limits. For water-treatment applications, the buyer may need stronger controls on impurities that could affect corrosion, discharge, or downstream membrane performance.
MGDA-3Na binds metal ions that would otherwise react with surfactants, builders, dyes, preservatives, or other formulation components. In hard water, calcium and magnesium can reduce cleaning efficiency and promote deposits on fabrics, dishes, equipment, or surfaces. MGDA helps keep these ions in water-soluble complexes.
This function explains its use in liquid detergents, automatic dishwashing products, institutional cleaners, industrial cleaning systems, and selected personal-care formulations. Think-Do Chemicals also identifies applications in industrial water treatment, agriculture, textile processing, and other systems where metal-ion control is required.
MGDA-3Na is often compared with EDTA because both are chelating agents, but the purchasing decision should not rely on biodegradability claims alone. I compare calcium-binding performance, dosage, pH stability, regulatory requirements, total formulation cost, and wastewater conditions. A lower unit price for an alternative may not result in a lower cost if the application requires a higher dose or causes more scale and residue.
Biodegradability can be a commercial advantage where customers, regulations, or wastewater policies limit persistent chelants. Nevertheless, the buyer should request the relevant compliance statement or test record instead of relying on general wording such as “eco-friendly.” The accepted standard, test result, and product grade should be documented.
For liquid laundry detergents, I prioritize active content, low visible sediment, controlled color, pH compatibility, and stable performance in the presence of surfactants and builders. The formulation team should test viscosity, clarity, storage stability, and cleaning performance after adding the actual commercial solution.
For automatic dishwashing products, hard-water control and low residue are central. The buyer should evaluate calcium and magnesium binding under the intended wash conditions, along with spotting, filming, foam behavior, and compatibility with alkaline builders.
For personal care formulations, the acceptance criteria are usually tighter. Color, odor, trace metals, microbial quality, preservative compatibility, and documentation must be reviewed before using MGDA-3Na in skin-care, hair-care, or cosmetic products. An industrial-grade product should not be assumed suitable for personal care without a separate grade review.
For industrial cleaning and water treatment, pH stability, density, dosing accuracy, scale-control performance, and compatibility with corrosion inhibitors may be more important than a very low color value. I recommend pilot testing with the actual water hardness, temperature, equipment materials, and cleaning concentration rather than relying only on a laboratory compatibility statement.
Liquid MGDA-3Na 40% should generally be stored in a cool, dry, ventilated area away from direct sunlight and extreme heat. Think-Do Chemicals lists a recommended storage range of approximately 5–30°C and identifies a 12-month shelf life for liquid grade when stored under the stated conditions.
Packaging should match order volume and handling equipment. Common industrial container sizes include 250 kg drums and 1,250 kg IBC tanks, while custom packaging may be available for smaller or specialized orders. Before approving a package, I check container material, closure design, pallet configuration, labeling, leakage controls, and compatibility with the liquid’s alkaline nature.
The label should identify the product name, grade, active content, net weight, production date, shelf life, manufacturer, batch number, and safety information. During transport, containers should be protected from direct sunlight, rain, severe impact, and temperature conditions that could damage packaging or affect product stability.
MOQ and shelf life should be reviewed together. A supplier with a low quoted price but a large MOQ may create working-capital and aging risks if the buyer consumes only a few containers per month. I calculate expected monthly usage, container turnover, freight per active kilogram, and the cost of disposing of expired or off-specification material.
The MGDA-3Na certificate of analysis should be batch-specific and match the product name, CAS number, grade, and concentration stated on the quotation. At minimum, I request the following documents:
Certificate of Analysis: active content, appearance, pH test basis, density, chloride, NTA, color, impurities, batch number, and release date.
Technical Data Sheet: product identity, typical properties, applications, recommended handling, packaging, shelf life, and test methods.
SDS or MSDS: hazard classification, first-aid measures, handling, storage, transport, and disposal information.
Compliance records: biodegradability information, REACH or regional registration status where applicable, restricted-substance declarations, and application-specific statements.
Export documents: commercial invoice, packing list, certificate of origin, transport classification, and any documents required by the destination country.
I also compare the CAS number, formula, and product terminology across every document. Some supplier pages may describe the material as MGDA, MGDA-3Na, methylglycine diacetic acid trisodium salt, or trisodium dicarboxymethyl alaninate. These names may refer to the same chemical identity, but differences involving hydrates, active basis, or solution concentration must be resolved before purchase.
I evaluate suppliers using four weighted areas: specification control, documentation, logistics, and technical support. A manufacturer should explain its release tests, provide batch records, identify the production site, and state whether the quoted value is guaranteed or typical.
Think-Do Chemicals presents itself as a manufacturer of biodegradable chelants and related amino-acid polymer products. Its published company information describes production and research facilities, multiple R&D laboratories, factory equipment, patent activity, customization support, and applications covering detergents, water treatment, agriculture, and industrial uses. I would still verify the exact MGDA-3Na 40% production location, batch capacity, MOQ, lead time, and export history during supplier qualification.
The final comparison should connect technical differences with total cost. I calculate the delivered cost per kilogram of active MGDA-3Na, then add freight, container handling, testing, storage, formulation adjustments, and the financial impact of inconsistent batches. A supplier with a slightly higher unit quotation may be more economical if its active content is consistent, documents are complete, and deliveries arrive within the required production schedule.
Before approving an MGDA-3Na 40% order, I confirm the identity as trisodium methylglycine diacetate, CAS 164462-16-2, and verify whether the formula and molecular-weight references apply to anhydrous material or a hydrate. I then compare the agreed specification for active content, pH, appearance, density, chloride, NTA, color, sediment, and other impurities against the batch COA.
The MGDA-3Na 40% Specification Explained: What Buyers Should Check process should end with more than a price comparison. I review the COA test methods, TDS, SDS, compliance records, packaging, shelf life, MOQ, storage range, shipping conditions, and supplier response time. Finally, I run an application trial using the actual detergent, industrial-cleaning, personal-care, or water-treatment formulation before approving regular supply.
