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E-mail:
thinkdo_calvin@126.com/thinkdochem@126.com
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To calculate the dosage of MGDA-3Na 40% solution, divide the required active MGDA amount by 0.40. For example, if a 100 kg formulation requires 0.50% active MGDA, the active requirement is 0.50 kg, and the required 40% solution is 0.50 ÷ 0.40 = 1.25 kg. Adjust the water or solvent phase so the final batch remains 100 kg.
When I calculate MGDA dosage for a detergent, cleaner, or other aqueous formulation, I separate three values: the final batch size, the target active MGDA concentration, and the commercial solution strength. MGDA-3Na 40% is not 40% active MGDA in every possible interpretation of the formulation; it is a commercial aqueous product containing approximately 40% active material, with the balance consisting mainly of water and other product-specific components. This distinction prevents the most common dosage error: adding the target active percentage as though it were the weight of the commercial solution.
MGDA-3Na is the trisodium salt of methylglycine diacetic acid, a water-soluble chelating agent used to bind metal ions such as calcium, magnesium, iron, and copper. In cleaning formulations, it helps reduce the effect of hardness ions and can support surfactant performance, builder efficiency, appearance control, and formulation stability. The “40%” designation normally refers to the approximate active concentration of the supplied liquid product.
The product concentration and the active MGDA content are therefore different calculation points. If a supplier’s technical data sheet specifies 40% active matter, one kilogram of product contains approximately 0.40 kg of active MGDA and approximately 0.60 kg of water or other non-active components. I always confirm the exact assay, density, pH, and specification range before finalizing a production formula because commercial products can differ.
Think-Do Chemicals manufactures MGDA-3Na and other biodegradable chelating products for applications that include detergents, daily chemicals, water treatment, agriculture, and industrial processing. The company also lists related chelants such as IDS and GLDA, along with polyaspartic acid products, and reports dedicated production, research, and development facilities. For a formulation project, the supplier’s current technical data sheet should remain the controlling document for active content and handling conditions.
The calculation uses a simple active-content relationship:
Required MGDA-3Na 40% solution = Required active MGDA amount ÷ 0.40
To calculate the required active amount:
Required active MGDA amount = Batch size × Target active percentage
When the target is written as a percentage, convert it to a decimal before multiplying. For example, 0.50% becomes 0.005, while 1.00% becomes 0.010. The complete equation is therefore:
Solution dosage = Batch size × Target active percentage ÷ 0.40
For a 100 kg batch with a target of 0.50% active MGDA:
Active MGDA required = 100 kg × 0.005 = 0.50 kg
MGDA-3Na 40% solution required = 0.50 kg ÷ 0.40
Commercial solution dosage = 1.25 kg
The 1.25 kg of solution contributes 0.50 kg of active MGDA. It also contributes approximately 0.75 kg of water or other non-active material, so I subtract the added solution weight from the water phase or final balance. If I add 1.25 kg of MGDA-3Na 40% without reducing another ingredient, the finished batch will exceed the intended 100 kg.
Before using a dosage calculator or spreadsheet, I collect the following information:
| Calculation input | Example | Why it matters |
|---|---|---|
| Final batch size | 100 kg | Establishes the total product quantity |
| Target active MGDA level | 0.50% | Defines the chelant requirement |
| Commercial solution strength | 40% | Converts active requirement into product weight |
A fourth value becomes important when production dosing is measured by volume rather than mass: the density of the MGDA-3Na 40% solution. Weight-based calculations are generally more reliable because formulation percentages are normally expressed by mass. If the plant uses liters, I convert the calculated kilograms using the supplier’s tested density at the applicable temperature.
The MGDA-3Na 40% active content calculation begins with the quantity of commercial solution added. The active amount is found by multiplying the solution weight by its active fraction:
Active MGDA = MGDA-3Na 40% solution weight × 0.40
For example, adding 2.00 kg of a 40% solution provides:
2.00 kg × 0.40 = 0.80 kg active MGDA
In a 100 kg finished product, 0.80 kg active MGDA represents:
0.80 kg ÷ 100 kg × 100 = 0.80% active MGDA
This reverse calculation is useful when reviewing an existing formula. If a production record shows that 1.50 kg of MGDA-3Na 40% was added to a 100 kg batch, the active MGDA contribution is 0.60 kg, equal to 0.60% active MGDA in the finished product.
A formula may list either the active MGDA percentage or the commercial MGDA-3Na 40% solution percentage. These values should not be treated as interchangeable. A target of 0.50% active MGDA requires 1.25% of a 40% solution by weight, assuming the formula is based on the final batch mass.
| Target active MGDA | Equivalent MGDA-3Na 40% solution |
|---|---|
| 0.20% | 0.50% |
| 0.40% | 1.00% |
| 0.50% | 1.25% |
| 0.80% | 2.00% |
| 1.00% | 2.50% |
The conversion is always the target active level divided by 0.40. If the supplier’s assay is 39% or 41% rather than exactly 40%, I replace 0.40 with the certified active fraction shown on the batch documentation.
Suppose I am preparing a 100 kg liquid detergent and want 0.50% active MGDA. The active requirement is 0.50 kg, calculated as 100 kg × 0.005. Dividing 0.50 kg by 0.40 gives 1.25 kg of MGDA-3Na 40% solution.
A simplified batch adjustment could look like this:
| Component | Original planned amount | Adjustment |
|---|---|---|
| Surfactants, builders, additives | 98.75 kg | No change |
| MGDA-3Na 40% solution | 0 kg | Add 1.25 kg |
| Water | 1.25 kg | Reduce by 1.25 kg |
| Final batch | 100.00 kg | Maintained |
This example assumes the original water quantity was calculated before adding the chelant solution. If the water was already set as a final balance, I add the MGDA solution and recalculate the water afterward rather than adding both independently.
For a 25 kg pilot batch at 0.40% active MGDA:
Active MGDA = 25 kg × 0.004 = 0.10 kg
MGDA-3Na 40% solution = 0.10 kg ÷ 0.40
Required solution = 0.25 kg
The water phase should be reduced by approximately 0.25 kg if the batch is balanced by final weight. For small-batch work, I use a scale with sufficient resolution because a 10 g weighing error represents 4% of a 0.25 kg addition.
For a 1,000 kg industrial cleaner requiring 0.80% active MGDA:
Active MGDA = 1,000 kg × 0.008 = 8.00 kg
MGDA-3Na 40% solution = 8.00 kg ÷ 0.40
Required solution = 20.00 kg
If the production system doses by volume and the approved density is 1.20 kg/L, the approximate volume is:
20.00 kg ÷ 1.20 kg/L = 16.67 L
I would not use this volume conversion until the density is confirmed for the actual material and temperature. A difference between 1.18 kg/L and 1.20 kg/L changes the required measured volume and can affect production accuracy.
There is no single best MGDA dosage for every formulation. I select the starting level according to water hardness, metal-ion contamination, alkalinity, surfactant system, builder package, soil load, storage conditions, and the performance target established by testing. The following ranges are practical screening levels rather than universal specifications.
| Application type | Initial active MGDA screening range | Equivalent MGDA-3Na 40% solution |
|---|---|---|
| Light-duty surface cleaner | 0.10–0.30% | 0.25–0.75% |
| Hand dishwashing liquid | 0.20–0.50% | 0.50–1.25% |
| Laundry liquid detergent | 0.30–0.80% | 0.75–2.00% |
| Automatic dishwashing detergent | 0.50–1.50% | 1.25–3.75% |
| Industrial alkaline cleaner | 0.50–2.00% | 1.25–5.00% |
| High-hardness water formulation | 0.80–2.00% | 2.00–5.00% |
These ranges should be verified through controlled comparison rather than copied directly into a finished formula. I normally prepare a control without MGDA and several test batches at increasing active levels, then measure cleaning performance, residue, viscosity, color, pH, storage stability, and compatibility with preservatives or fragrances. The required dosage is the lowest level that meets the product specification under representative use conditions.
Water hardness is one of the main variables affecting chelating agent dosage. A formulation made with low-hardness deionized water may need less MGDA than the same product manufactured with untreated water containing elevated calcium and magnesium. Iron or copper contamination from raw materials, tanks, pipes, or pigments can also increase the required chelant level.
For screening, I divide the test plan into three conditions: low metal-ion load, normal process water, and elevated hardness or contamination. If performance drops only in the elevated-load condition, the formulation may require a higher MGDA level or improved raw-material control. This approach is more reliable than selecting a dosage solely from a general industry range.
MGDA binds selected metal ions through coordination, reducing their ability to interfere with other formulation components. In cleaning products, this can help limit the effects of calcium and magnesium on surfactants and builders, while also reducing the catalytic influence of trace transition metals on color or oxidation-sensitive ingredients. The result depends on pH, temperature, contact time, competing ions, and the total metal-ion load.
MGDA is often considered when a formulator wants a biodegradable chelating option for detergents and cleaners. However, dosage should not be selected only from biodegradability or ingredient-label considerations. I compare MGDA with EDTA or other chelants using the actual application conditions, because binding strength, pH response, regulatory requirements, formulation compatibility, and cost per active kilogram can differ.
MGDA-3Na 40% and EDTA are both chelating agents, but their chemistry, active concentration, sodium content, biodegradation profiles, and performance across different metal ions are not identical. A direct weight-for-weight substitution is therefore not scientifically reliable. If an existing formula uses 0.20% EDTA, I treat that as a starting reference and conduct a performance study with MGDA rather than assuming 0.20% MGDA will produce the same result.
For a meaningful comparison, I keep the batch size, water source, pH, surfactant concentration, builder system, and test procedure constant. I then compare cleaning score, foam behavior, viscosity, color, storage stability, and residue under the intended use conditions. The final dosage should be based on measured results and the supplier’s technical data sheet.
Before releasing a formula for pilot or commercial production, I check the following items:
Confirm whether the formula specifies active MGDA or commercial solution percentage.
Verify the supplier’s certified active content, density, pH, and specification range.
Convert the target active level from percentage into a decimal.
Multiply batch size by the target active fraction.
Divide the active requirement by the actual solution strength.
Reduce water or another compatible carrier to maintain final batch weight.
Convert kilograms to liters only after confirming density.
Define the rounding tolerance for plant weighing or metering equipment.
Check addition order, mixing time, temperature, and pH compatibility.
Confirm performance through hardness, metal-ion, storage, and application testing.
Rounding deserves special attention in production. If a calculation gives 1.247 kg but the plant scale records to the nearest 0.1 kg, the operator may add 1.2 or 1.3 kg, creating a measurable change in active concentration. For small batches, I use a finer weighing resolution or prepare a premix so the chelant can be distributed more accurately.
How to Calculate the Dosage of MGDA-3Na 40% in a Formulation depends on separating the active MGDA requirement from the commercial solution quantity. Use the formula: MGDA-3Na 40% solution = batch size × target active percentage ÷ 0.40. For a 100 kg batch targeting 0.50% active MGDA, the required solution is 1.25 kg, and the water phase should be adjusted to preserve the final batch weight.
I recommend starting with a dosage range suited to the product type, then testing the formula under actual water-hardness and metal-ion conditions. Before production, verify the active assay and density against the supplier’s technical data sheet, including the applicable MGDA specification from Think-Do Chemicals. This process gives formulators a traceable calculation, accurate batch scaling, and a practical basis for selecting the lowest dosage that meets performance requirements.
