ATMP 50% is an aqueous solution of Amino Trimethylene Phosphonic Acid (ATMP) that typically contains about 50% active acid. It works as a phosphonate scale and corrosion inhibitor in industrial water treatment, including cooling water, boiler water and oilfield water systems. However, ATMP 50% differs from ATMP powder and from ATMP sodium salts (ATMP·Na5). Therefore, the right choice depends on your dosing equipment, formulation, climate and logistics.
This guide explains how to read an ATMP 50% specification, compares the available forms and gives typical dosage ranges. In addition, it covers packaging and shows what to check before a bulk purchase.
What Is ATMP 50%?
ATMP vs ATMP 50%
ATMP is the chemical substance itself. It has CAS number 6419-19-8 and the molecular formula C₃H₁₂NO₉P₃. In contrast, “ATMP 50%” is the common shorthand for the commercial liquid with about 50% active acid by weight. Suppliers also offer ATMP as a crystalline powder and as sodium salts.
Other Names and Chemical Identifiers
You may also see ATMP listed under other names, such as aminotris(methylenephosphonic acid), nitrilotris(methylenephosphonic acid), NTMP or aminotrimethylene phosphonic acid. Because names vary, compare products by CAS number and technical specification rather than by name alone.
Meanwhile, remember that in pharmaceuticals “ATMP” stands for Advanced Therapy Medicinal Products. This guide covers only the water treatment chemical.
ATMP 50% Specifications
| Parameter | HOO CHEMTEC Typical Specification |
|---|---|
| Chemical name | Amino Trimethylene Phosphonic Acid |
| CAS No. | 6419-19-8 |
| Molecular formula | C₃H₁₂NO₉P₃ |
| Appearance | Clear, colorless liquid |
| Active acid content | ≥50% |
| pH (1% solution) | 1.5–2.0 |
| Density (20°C) | ≥1.27 g/cm³ |
| Phosphorous acid | ≤0.5% |
| Phosphoric acid | ≤0.2% |
| Ca chelating value | ≥450 mg/g |
Specifications may vary by grade and production batch. Therefore, confirm the current TDS and the batch COA before you buy.
How to Read an ATMP 50% Specification
Active acid content comes first, because it is the concentration you actually pay for. In addition, ask which content metric the “50%” refers to and which test method the COA uses. That way, you can compare results from different suppliers like for like.
pH comes next. It helps confirm the product form and batch consistency, since the acid form is strongly acidic, unlike the sodium salt.
Density works as a useful incoming-quality check. If a result falls outside the agreed specification, investigate it together with active acid content and the other COA parameters.
Phosphorous acid and phosphoric acid are process-related impurities. Consider their limits together with your application requirements and the supplier’s agreed specification.
Ca chelating value gives a functional indication of chelating capacity. Finally, request it on the COA so you can track it from batch to batch.
Compare Price per Ton of Active ATMP
Effective price per ton of active ATMP = product price ÷ active acid content
For example, consider two illustrative quotes (not HOO pricing):
- $1,000/t ÷ 0.45 = $2,222 per ton of active
- $1,050/t ÷ 0.50 = $2,100 per ton of active
As a result, a higher product price does not necessarily mean a higher cost per unit of active ingredient. However, freight, packaging and payment terms also matter, so compare them separately.
ATMP 50% Liquid vs ATMP Powder
| Factor | ATMP 50% Liquid | ATMP Powder |
|---|---|---|
| Physical form | Liquid | Crystalline powder |
| Active content | About 50% | About 95% |
| Handling | Pumpable | Requires solid handling and dissolution |
| Dosing | Suitable for liquid dosing systems | Requires make-down before dosing |
| Freight | More water per ton shipped | Higher active concentration |
| Storage | Drums / IBCs | Dry solid storage; unaffected by freezing |
Choose ATMP 50% liquid when your system uses liquid dosing and you want a ready-to-feed product, as in standard cooling water programs. On the other hand, consider ATMP powder when higher active concentration, cold-climate storage or long-distance shipping matter more than convenience. A higher active concentration reduces the non-active water you ship per ton of active ingredient. Nevertheless, include dissolution equipment and solid handling in your comparison.
ATMP 50% vs ATMP·Na5
ATMP·Na5 is the pentasodium salt of ATMP. It is an alkaline sodium-salt form, so it may suit formulations or processes that need an alkaline phosphonate solution. ATMP 50%, on the other hand, is the acid form.
| Factor | ATMP 50% | ATMP·Na5 |
|---|---|---|
| Chemical form | Acid | Sodium salt |
| pH | Strongly acidic | Alkaline |
| Selection | Depends on formulation and process | Depends on formulation and process |
For the full comparison, see our guide to sodium aminotrimethylene phosphonate (ATMP·Na5).
How Does ATMP Control Scale?
ATMP controls scale in three main ways.
1. Chelation. ATMP binds metal ions such as calcium, magnesium and iron, which keeps them in solution.
2. Threshold inhibition. Small amounts of ATMP interfere with scale formation, so you do not need chemical equal to the amount of scale-forming ions.
3. Crystal-growth modification. ATMP also disturbs crystal growth and deposition, which helps reduce mineral scale, particularly calcium carbonate.
What Is ATMP 50% Used For?
Operators mainly use ATMP 50% in industrial circulating cooling water, boiler water and oilfield water systems. In addition, formulators include it as a component in water treatment blends. For the full application overview, read ATMP uses and advantages in industrial water treatment.
ATMP, HEDP and PBTCA are all phosphonate-based chemicals. However, their suitability differs by water chemistry, temperature, oxidant exposure and formulation. Therefore, see HEDP vs ATMP and our HEDP and PBTCA pages for comparisons.
ATMP 50% Dosage
ATMP dosage depends on water chemistry, scale tendency, operating conditions and the rest of the treatment formulation. For circulating cooling water, supplier technical literature commonly gives the ranges below.
| Purpose | Commonly published range |
|---|---|
| Scale inhibition / chelation | 1–20 mg/L |
| Corrosion inhibition | 20–60 mg/L |
Keep in mind that these ranges are general references, not a universal dosage. Also confirm whether a quoted figure refers to product or to active ATMP. Finally, set the actual dose through water analysis, formulation testing or a pilot trial.
ATMP 50% Packaging and Bulk Supply
HOO CHEMTEC supplies ATMP 50% liquid in 250 kg drums and 1.25 MT IBCs. Similarly, we offer ATMP powder in 25 kg bags, and other packaging options are available subject to confirmation. On request, we provide the COA, TDS, SDS and packing list.
Because ATMP 50% is an acidic, corrosive product, transport and hazard classifications can depend on the grade and destination. Therefore, always follow the current SDS for shipping and handling decisions.
How to Evaluate an ATMP 50% Supplier
Use the checklist below when you evaluate an ATMP 50% supplier.
| What to Check | Why It Matters |
|---|---|
| Active acid content | Sets the effective concentration you pay for |
| pH | Confirms product form and consistency |
| Density | Supports incoming quality control |
| Impurity limits | Affects formulation compatibility |
| COA (several recent batches) | Shows batch-to-batch consistency |
| TDS | Defines the technical specification |
| SDS | Supports safe handling and shipping |
| Packaging | Affects storage and logistics |
| Sample | Lets you test in your own application |
Above all, do not compare suppliers by price per ton alone. Instead, compare active content, specification limits, documentation and application compatibility. Before you place a bulk order, ask the supplier to confirm the exact specification and to send a representative COA and sample.
Need ATMP 50% for Your Water Treatment Program?
HOO CHEMTEC supplies ATMP (Amino Trimethylene Phosphonic Acid) liquid and powder for industrial water treatment. Contact us for specifications, COA, TDS, SDS, samples, packaging options and a bulk quotation.
Request TDS | Request COA | Request a Sample | Get a Quote
FAQ
What is ATMP 50%?
It is an aqueous solution of amino trimethylene phosphonic acid with about 50% active acid content. Industrial water treatment programs use it as a scale and corrosion inhibitor.
What does 50% mean in ATMP 50%?
The figure generally refers to the nominal active acid concentration of the commercial solution by weight. However, actual batch results vary, so check the supplier’s specification or COA.
Is ATMP 50% a liquid?
Yes, it is a clear, colorless liquid. In addition, suppliers offer ATMP as a crystalline powder.
Is ATMP 50% acidic or alkaline?
It is acidic. A 1% solution typically has a pH of about 1.5–2.0, whereas the sodium salt ATMP·Na5 is alkaline.
What is ATMP 50% used for?
Cooling water, boiler water and oilfield water systems rely on it for scale and corrosion control. Formulators also use it in water treatment blends.
Can I get a sample of ATMP 50%?
Yes. Contact us with your application and destination, and we will confirm sample availability.
What is the difference between ATMP 50% and ATMP powder?
The powder has a higher active concentration and needs dissolving before dosing. The liquid, in contrast, arrives ready to feed.
