GLDA-4Na 47% Specification Explained: What Buyers Should Check

GLDA-4Na 47% is a liquid grade of tetrasodium glutamate diacetate used as a biodegradable chelating agent. When I review a purchase specification, I check the active content, pH, chloride level, appearance, density, assay basis, packaging, storage conditions, batch-specific COA, SDS, and supplier documentation before approving the material.

For chemical buyers, the number 47% is only one part of the evaluation. A reliable purchasing decision also depends on whether the concentration is reported on an as-supplied basis, whether the density supports accurate formulation calculations, and whether each shipment matches the agreed limits. I also compare the product’s intended application, such as detergents, industrial cleaners, water treatment, agriculture, or cosmetic formulations.

GLDA-4Na 47% Specification: Key Parameters Buyers Should Check

I treat a GLDA-4Na 47% specification as a technical control document rather than a sales description. The specification should identify the chemical clearly, define measurable acceptance limits, and distinguish guaranteed values from typical production data. The following parameters form the minimum review set for most industrial and formulation applications.

The values above should be treated as a product-grade reference, not as a substitute for a signed specification agreed between buyer and supplier. If a supplier provides only a product brochure, I request a controlled technical data sheet and a batch-specific certificate of analysis. This distinction is important because a brochure may show a general grade, while a COA should identify the actual batch tested.

What Is GLDA-4Na 47%?

GLDA-4Na is the tetrasodium salt of glutamic acid diacetate, commonly identified by CAS 51981-21-6. Its molecular formula is C₉H₁₃NO₈·4Na, and the 47% liquid grade contains at least 47.0% active material according to the stated specification. The remaining portion is primarily water and dissolved inorganic components associated with the manufacturing and neutralization process.

As a chelating agent, GLDA-4Na binds metal ions through oxygen-containing functional groups. This interaction can reduce the reactivity of calcium, magnesium, iron, copper, and other metal ions in a formulation or process stream. In practical terms, this can help control scale, reduce metal-catalyzed oxidation, improve detergent performance, and stabilize formulations containing trace metals.

I would not evaluate GLDA-4Na only by its active percentage. A 47% liquid product can behave differently from a 38% grade during dosing because the buyer is purchasing both active chelator and carrier water. Density, viscosity, temperature, and the declared assay method all affect how the product is measured and added to a formulation.

How to Interpret GLDA-4Na 47% pH, Assay, and NTA Specifications

The GLDA-4Na 47% pH and NTA limits should be reviewed together with the active-content specification. A stated pH range of 10.0–12.0 for a 1% aqueous solution indicates the test concentration and dilution method; it does not mean that the undiluted product has the same pH value. A COA that reports pH without identifying the test concentration is incomplete for technical comparison.

Assay or active content must also have a defined basis. The buyer should confirm whether “47%” refers to GLDA-4Na content, total chelating activity, dry solids, or another analytical expression. If two suppliers use different assay methods, their reported percentages may not be directly comparable even when both products are labeled as 47%.

NTA deserves specific attention when the product is intended for detergents, cosmetics, institutional cleaners, or applications with restricted ingredient profiles. I request the actual NTA result or stated maximum limit rather than accepting an unqualified claim such as “NTA-free.” The COA should identify the test method, reporting unit, detection limit where applicable, and batch result.

Chloride is another practical control point. A specification of no more than 3% chloride ion may be acceptable for many cleaning and water-treatment applications, but it can be significant in systems sensitive to total dissolved salts, corrosion, conductivity, or downstream purification. I therefore compare the chloride limit with the finished-product requirements instead of treating it as an isolated number.

How to Read a GLDA-4Na 47% Specification Sheet

I read a specification sheet in four stages: identity, guaranteed limits, test methods, and commercial conditions. First, I confirm the product name, CAS number, molecular formula, physical form, active concentration, and intended grade. This prevents confusion between GLDA-4Na 47%, GLDA-4Na 38%, solid GLDA, and other aminopolycarboxylate chelants.

Next, I separate guaranteed limits from typical values. A guaranteed limit is an acceptance criterion that the supplier commits to meeting, such as active content of at least 47.0%, pH between 10.0 and 12.0, or density of at least 1.30 g/cm³. A typical value describes normal production behavior but may not provide a contractual rejection basis unless it is included in the signed specification.

The third stage is checking test conditions. The document should state whether pH is measured in a 1% solution, whether density is measured at 20°C, and how active content and chloride are determined. Without test conditions, a number may appear precise but remain unsuitable for supplier-to-supplier comparison.

Finally, I compare the technical sheet with the purchase order, label, SDS, packaging list, and COA. The product name, batch number, production date, net weight, active content, and shelf-life information should be consistent across documents. Any mismatch should be resolved before the material is released for production.

What Should Buyers Check on a GLDA-4Na 47% COA?

The GLDA-4Na 47% COA requirements should be agreed before the first commercial shipment. At minimum, I expect the COA to include the supplier’s legal entity, product name, batch or lot number, manufacturing date, test date, specification limits, actual test results, analytical methods, authorized approval, and statement of conformity.

A useful COA should report actual results rather than repeating only the specification limits. For example, “active content: 47.6%” provides more information than “active content: ≥47.0%.” Actual values help the buyer monitor batch consistency, identify gradual changes in concentration, and calculate formulation additions more accurately.

I also check whether the COA includes appearance, pH, chloride, density, and any application-specific parameters. For cosmetic, food-contact, agricultural, or pharmaceutical-related uses, additional information may be required, including restricted substances, microbiological controls, heavy metals, allergen statements, regulatory status, or traceability documents. These requirements depend on the finished product and destination market.

Before approving a supplier, I compare the submitted COA with an independently tested pre-shipment sample. If the COA reports 47.6% active content but the buyer’s laboratory obtains a materially different result, the discrepancy should be investigated before bulk delivery. Possible causes include sampling error, analytical-method differences, water evaporation, contamination, or batch substitution.

GLDA-4Na 47% vs 38%: Which Grade Should You Choose?

The main difference between GLDA-4Na 47% and GLDA-4Na 38% is the amount of active chelating material supplied per unit mass or volume. A 47% grade contains more active material and less carrier water than a 38% grade, assuming both percentages use the same assay basis. This can reduce the mass of product required to deliver the same active dose.

For a target of 47 kg active GLDA-4Na, a 47% product requires approximately 100 kg of material. A 38% product would require approximately 123.7 kg to deliver the same nominal active amount. The actual calculation should use the supplier’s batch assay, not only the grade name, because a batch at 47.2% and a batch at 38.4% will produce different dosing requirements.

The 47% grade may be more practical when storage volume, freight weight, tank capacity, or formulation water must be controlled. The 38% grade may fit a process that already requires additional water or has an established dosing system designed around that concentration. I would compare total delivered cost per kilogram of active material rather than comparing the price per kilogram of liquid alone.

How Active Concentration, Density, and Dilution Affect Formulation Calculations

Many dosing errors occur because operators use a volume measurement without checking density. If the density is 1.30 g/cm³, one liter of product weighs approximately 1.30 kg. At a nominal active content of 47%, that liter contains about 0.611 kg of active material before considering the exact batch assay.

For example, if a detergent formula requires 4.7 kg of active GLDA-4Na, the theoretical requirement is approximately 10 kg of a 47% product. If the product density is 1.30 kg/L, that equals roughly 7.7 liters. I still confirm the calculation using the actual COA assay and measured density when dosing accuracy is important.

Dilution also changes the mass balance. Adding 10 kg of 47% liquid contributes approximately 4.7 kg active material and about 5.3 kg of non-active liquid components. If the formulation has a strict water balance, this additional liquid must be included in the batch calculation rather than treated as a negligible processing aid.

For industrial cleaning, agricultural, or water-treatment applications, the supplier’s recommended dose should be validated through a controlled trial. The correct dosage depends on water hardness, metal-ion load, pH, temperature, contact time, surfactant system, and the performance target. I use supplier guidance as a starting point, then confirm the dose with application testing.

Applications, Packaging, Storage, and Handling

GLDA-4Na 47% is used in household and institutional cleaners, industrial cleaning products, water-treatment formulations, agricultural trace-element products, and selected personal-care formulations. In detergents, it can bind calcium and magnesium ions that interfere with cleaning performance. In industrial systems, it may help control scale-forming ions and metal deposits.

For liquid grades, common packaging options include 25 kg plastic barrels and 250 kg IBC tanks, with other sizes available by agreement. I check the compatibility of the container material with the product, the closure system, pallet arrangement, label information, and loading method. The label should identify the product, grade, active content, net weight, production date, shelf life, manufacturer, and handling instructions.

Recommended storage conditions generally include a cool, dry, ventilated warehouse maintained around 5–30°C. Containers should remain tightly closed and protected from direct sunlight, rain, freezing conditions, excessive heat, and incompatible substances such as strong acids or oxidizers. For the liquid grade, a 12-month shelf-life statement is commonly used when the product remains sealed and properly stored.

Before use, I inspect the container for leakage, swelling, damaged seals, unusual discoloration, sediment, or phase separation. A sample showing visible deterioration should be quarantined until the supplier and laboratory complete an investigation. Operators should use suitable gloves and eye protection and follow the current SDS.

How to Choose a GLDA-4Na 47% Supplier

Supplier qualification should cover technical capability, documentation, production control, packaging, and responsiveness to nonconformance. I first request a current specification sheet, SDS, sample COA, product sample, packaging information, shelf-life statement, and regulatory documents relevant to the destination market. I then compare the documents against the intended application and import requirements.

A supplier’s manufacturing background is also relevant. Think-Do Chemicals identifies GLDA-4Na as part of its biodegradable chelant product range and reports chemical production and research activities in China, including multiple research laboratories, production equipment, and experience with chelating products. Those claims should still be confirmed through the buyer’s own qualification process, including sample testing, document review, and evaluation of commercial batch performance.

For the first order, I recommend a staged approval process:

1. Define the required specification, test methods, packaging, and acceptance criteria.

2. Test a representative sample against the buyer’s internal methods.

3. Review the supplier’s COA, SDS, regulatory documents, and traceability information.

4. Approve a controlled commercial batch rather than moving immediately to the largest possible order.

5. Test the incoming batch for active content, pH, appearance, density, and other critical limits.

6. Record batch results and review consistency before expanding annual volume.

Price should be evaluated on a delivered active basis. I compare product price, active concentration, density, freight, packaging, import charges, testing costs, storage losses, and the cost of rejected or off-specification material. A lower price per kilogram of liquid may not be lower when the product contains less active chelator or creates additional water-handling costs.

Final Buyer Checklist

Before purchasing GLDA-4Na 47% in bulk, I confirm the following:

• Chemical identity: tetrasodium glutamate diacetate, CAS 51981-21-6.

• Molecular formula: C₉H₁₃NO₈·4Na.

• Active content: at least 47.0%, with assay basis stated.

• Appearance: light yellow to yellow transparent liquid.

• pH: measured in a defined 1% aqueous solution, typically 10.0–12.0.

• Chloride: stated limit and analytical method.

• Density: measured at 20°C, with the unit clearly shown.

• NTA: actual result or defined maximum limit where required.

• COA: batch number, test date, actual results, methods, and authorized approval.

• SDS: current revision with storage, handling, transport, and hazard information.

• Packaging: approved container type, net weight, labeling, and seal condition.

• Storage: temperature range, shelf life, and retest procedure.

• Supplier qualification: sample approval, documentation review, and incoming-batch testing.

Conclusion

The GLDA-4Na 47% Specification Explained: What Buyers Should Check is ultimately a buyer-control process, not just a review of the 47% concentration. I would verify the chemical identity, CAS number, molecular formula, active-content basis, pH, chloride, NTA, appearance, density, packaging, shelf life, and batch-specific COA before approving a shipment. I would also calculate dosage using actual assay and density values instead of relying only on nominal grade names.

For regular purchasing, I recommend comparing GLDA-4Na 47% with lower-concentration grades on a cost-per-active-kilogram basis. Before committing to bulk volume, approve a sample, test the material with the intended formulation, review the SDS and regulatory documents, and establish incoming-batch testing requirements. A supplier such as Think-Do Chemicals can be considered within this process, but the final decision should depend on verified COA results, consistent batch performance, suitable packaging, documentation completeness, and documented supplier response to technical questions.