2-Acrylamido-2-methylpropane Sulfonic Acid (AMPS/ATBS)

What Is 2-Acrylamido-2-methylpropane Sulfonic Acid?

2-Acrylamido-2-methylpropane sulfonic acid, commonly abbreviated as AMPS or ATBS, is a water-soluble vinyl monomer containing both a polymerizable double bond and a strongly acidic sulfonic acid group.

AMPS is normally polymerized or copolymerized rather than used as an unchanged additive. Incorporating it into a polymer can improve hydrophilicity, electrolyte tolerance, dispersion, adhesion and performance under demanding aqueous conditions.

AOZUN supplies high-purity AMPS/ATBS in white crystalline powder or granular form for the production of water-treatment polymers, oilfield chemicals, coatings, adhesives, textile auxiliaries and other specialty polymers.

AMPS/ATBS Product Quick Facts

AMPS and ATBS are common commercial abbreviations for the same acid-form monomer. They should not be confused with NaAMPS or NaATBS, which is the sodium salt.

Why Choose AOZUN as Your AMPS/ATBS Supplier?

AOZUN supports industrial buyers requiring consistent AMPS quality, export documentation and application-based product selection.

Our supply advantages include:

• High-purity AMPS suitable for industrial polymerization

• Low moisture and controlled trace-metal content

• White powder or granular appearance

• Batch-specific Certificate of Analysis

• SDS and technical documentation support

• Standard 25 kg export packaging

• Sample availability for laboratory qualification

• Flexible quantities for trials and commercial production

• International shipping and export-document support

• Assistance distinguishing AMPS acid from its sodium salt

Please provide your intended application, purity requirement, annual consumption and destination when requesting a quotation.

AOZUN AMPS Technical Specifications

The following values represent common commercial targets for high-purity AMPS. The approved sales specification and batch Certificate of Analysis take precedence.

Requirements for solution color, particle form, iron content, moisture or other application-sensitive parameters should be confirmed before ordering.

Why Is AMPS Used in High-Performance Polymers?

AMPS combines three functional features in one reactive molecule. These features explain its widespread use in water-soluble and performance-oriented polymers.

Strong Sulfonic Acid Functionality

The sulfonic acid group provides strong ionic character after neutralization. When incorporated into a polymer, it can increase water affinity, help maintain charge across a broad pH range and improve performance in electrolyte-containing systems.

The result depends on polymer composition, molecular weight, neutralization level and operating conditions. AMPS does not automatically make every polymer resistant to all salts, temperatures or pH conditions.

Polymerizable Vinyl Group

The carbon-carbon double bond enables AMPS to participate in free-radical polymerization. Its functionality becomes part of the polymer backbone instead of acting only as a physically blended additive.

This can provide more durable hydrophilicity and ionic functionality in appropriately designed copolymers.

Sterically Protected Amide Structure

The amide group and neighboring methyl groups can contribute to hydrolytic and thermal performance in AMPS-containing polymers. This is valuable in oilfield, water-treatment and industrial processes where polymers may encounter elevated temperature or dissolved salts.

Final performance must still be confirmed in the customer’s actual formulation.

What Is AMPS Used For?

Water-Treatment Polymers

AMPS is used as a comonomer in polymers designed for:

• Scale-control formulations

• Mineral and pigment dispersants

• Boiler- and cooling-water polymers

• Membrane-treatment formulations

• Sludge-conditioning polymers

• Flocculants and water-soluble copolymers

AMPS helps introduce strongly hydrophilic and anionic groups. The raw monomer is generally converted into a polymer before being used in a water-treatment formulation.

Oilfield and Mining Chemicals

AMPS-containing polymers are used in selected:

• Drilling-fluid additives

• Fluid-loss-control polymers

• Cementing additives

• Friction-reducing polymers

• Enhanced-oil-recovery systems

• Mineral-processing dispersants

• High-salinity water formulations

Its value comes from the potential to improve polymer hydration, brine tolerance and performance under demanding conditions. Actual compatibility depends on brine composition, temperature, pressure and the complete polymer structure.

Coatings, Adhesives and Emulsions

AMPS can be copolymerized into waterborne binders and emulsion polymers to support:

• Particle stabilization

• Dispersion stability

• Surface wetting

• Adhesion

• Hydrophilic modification

• Controlled ionic functionality

The dosage should be optimized carefully because excessive ionic content may affect water resistance, viscosity or film properties.

Textile and Acrylic Fiber Modification

In textile and fiber polymerization, AMPS may be used to introduce ionic sites that improve:

• Dye affinity

• Hydrophilicity

• Antistatic performance

• Polymer dispersibility

• Fiber-processing behavior

Required purity and solution color should be selected according to the appearance and performance requirements of the finished fiber.

Paper and Pulp Chemicals

AMPS-based copolymers may be incorporated into paper-processing formulations such as dispersants, retention systems and functional additives.

Performance depends on pulp composition, water quality, filler content and the other monomers used in the polymer.

Construction Chemicals

AMPS can be used in polymers for cementitious and mineral systems, including selected:

• Cement dispersants

• Water-retention polymers

• Rheology modifiers

• Fluid-loss-control additives

• Dry-mix mortar additives

The monomer can help provide ionic functionality and performance in systems containing calcium and other dissolved ions. Cement compatibility must be confirmed through application testing.

Superabsorbent Polymers and Hydrogels

AMPS-containing polymers can provide water affinity and ionic functionality to certain hydrogels and absorbent materials. They may be considered where swelling or water retention in electrolyte-containing media is important.

Use in personal-care, biomedical or regulated products requires a specifically qualified grade, residual-monomer control and compliance with applicable regulations. Industrial-grade AMPS should not automatically be presented as suitable for these uses.

Specialty Polymer Synthesis

AMPS is also used in the development of:

• Water-soluble copolymers

• Ion-exchange materials

• Functional membranes

• Polymer dispersants

• Rheology-control polymers

• Hydrophilic surface modifiers

• Electrically or ionically functional materials

The monomer selection should be based on the required polymer architecture and end-use performance.

Which Monomers Can Be Copolymerized with AMPS?

AMPS may be copolymerized with various vinyl monomers, including:

• Acrylamide

• Acrylic acid

• Acrylic esters

• Methacrylic monomers

• Acrylonitrile

• Other polymerizable hydrophilic or hydrophobic monomers

The appropriate monomer combination depends on the target balance between charge density, solubility, molecular weight, thermal performance, adhesion and water resistance.

Copolymerization ratios should be established through laboratory evaluation. A ratio used successfully in one application may not be suitable for another application.

AMPS vs ATBS vs NaAMPS: What Is the Difference?

These names are sometimes used inconsistently, so buyers should confirm the chemical form and CAS number before placing an order.

AMPS and ATBS normally refer to the same acid-form material. NaAMPS is a neutralized sodium salt and is not a weight-for-weight substitute for the acid.

Changing from AMPS acid to sodium AMPS may affect:

• Active-monomer content

• Water introduced into the process

• Sodium-ion concentration

• Formulation pH

• Neutralization demand

• Storage and pumping requirements

• Polymerization mass balance

Always compare products on an active-monomer basis.

How Does AMPS Compare with Other Ionic Monomers?

These monomers are not universally interchangeable. Selection should be based on polymer structure, process conditions, ion type and finished-product requirements.

How to Select the Right AMPS Grade

1. Confirm Purity

High monomer purity can support more predictable polymerization and reduce the introduction of nonreactive residues.

A purity of at least 99.0% is commonly selected for demanding industrial polymerization, although the necessary limit depends on the application.

2. Check Moisture Content

Moisture affects active-monomer calculations, storage behavior and dissolution. Excess moisture may also contribute to caking during transportation or storage.

Customers using dry-charge processes should define an appropriate maximum water limit.

3. Review Iron and Other Trace Metals

Trace metals can affect solution color, polymerization behavior and initiator performance. Low-iron grades may be particularly important for light-colored polymers, clear gels and controlled radical processes.

4. Evaluate Solution Color

A white solid does not always produce a sufficiently colorless solution. Buyers manufacturing transparent gels, coatings or light-colored polymers should specify the required APHA or Hazen color for a defined solution concentration.

5. Verify the Acid Value

The acid value helps confirm composition and acidity. It is especially useful when comparing different suppliers or qualifying new batches.

6. Select Powder or Granular Form

Particle form can influence:

• Dissolution time

• Dust formation

• Material transfer

• Caking tendency

• Automated feeding

The preferred form should match the customer’s charging and dissolution equipment.

7. Confirm Acid or Sodium-Salt Form

Buyers should not rely only on the abbreviation AMPS or ATBS. Confirm the CAS number, active content, physical form and neutralization state.

How Should AMPS Be Qualified in a Polymerization Process?

A structured qualification procedure reduces the risk of production-scale problems.

Step 1: Define the Target Polymer

Specify the required molecular weight, charge density, viscosity, solubility, salt tolerance, temperature performance and end-use function.

Step 2: Confirm Monomer Form and Active Basis

Determine whether the formulation requires AMPS acid or NaAMPS solution. Correct for water, sodium content and active monomer when calculating the recipe.

Step 3: Evaluate Dissolution and Neutralization

Record dissolution time, solution clarity, temperature change and neutralization behavior. Neutralization of an acidic monomer may release heat and should be controlled appropriately.

Step 4: Run Laboratory Polymerization Trials

Compare polymerization rate, temperature profile, conversion and viscosity using the intended initiator system and process water.

Step 5: Test the Finished Polymer

Depending on the application, evaluation may include:

• Molecular-weight distribution

• Residual monomer

• Solution viscosity

• Clarity and color

• Salt and hardness tolerance

• Thermal-aging stability

• Hydrolytic stability

• Scale inhibition

• Dispersion performance

• Fluid-loss control

• Adhesion or film properties

Step 6: Complete a Controlled Scale-Up

Confirm heat removal, mixing, feeding rate and process safety before moving to commercial production. Vinyl-monomer polymerization can be exothermic and requires suitable process controls.

Storage, Stability and Safe Handling

AMPS is an acidic, polymerizable solid. Appropriate workplace controls are required.

Recommended handling principles include:

• Store in tightly closed original packaging.

• Keep the material in a cool, dry and well-ventilated place.

• Protect it from moisture, heat and direct sunlight.

• Prevent contact with incompatible initiators and reactive contaminants.

• Avoid uncontrolled exposure to oxidizing or reducing agents.

• Minimize dust generation during charging and transfer.

• Use suitable gloves, protective clothing and eye or face protection.

• Provide local ventilation where dust may be generated.

• Prevent release into drains or the environment.

• Use the current supplier SDS for detailed handling and emergency measures.

AMPS may cause serious eye injury and may irritate the skin or respiratory system. Storage temperature, inhibitor information, transport classification and shelf life should always be confirmed from the current AOZUN SDS and product documentation.

Packaging and Supply Options

Standard AOZUN packaging:

• 25 kg woven bag with an inner protective liner

Alternative packaging or pallet configurations may be available after confirmation.

To protect quality during transportation and storage, keep the liner sealed and avoid exposure to moisture. Partially used bags should be resealed promptly.

What Documents Should an AMPS Supplier Provide?

Professional industrial buyers should request the following documents:

• Batch-specific Certificate of Analysis

• Safety Data Sheet

• Technical Data Sheet

• Commercial invoice

• Packing list

• Country-of-origin documentation when required

• Transport documentation

• Regulatory statements required for the destination market

For regulated or high-purity applications, buyers may also need additional information concerning residual monomer, trace metals, impurities, manufacturing consistency or applicable registrations.

Document availability should be confirmed before the purchase order is issued.

Information Required for an Accurate AMPS Quotation

Please provide:

• Product name: AMPS/ATBS acid or sodium salt

• Required purity

• Powder, granular or solution form

• Required quantity

• Estimated annual consumption

• Intended application

• Required packaging

• Destination port or delivery address

• Required Incoterm

• Special limits for water, iron or solution color

• Required regulatory and shipping documents

Providing complete information helps AOZUN recommend the appropriate grade and prepare a more accurate quotation.

Frequently Asked Questions About AMPS/ATBS

What is AMPS?

AMPS is a water-soluble sulfonic-acid-functional vinyl monomer. Its full name is 2-acrylamido-2-methylpropane sulfonic acid, and its CAS number is 15214-89-8.

Are AMPS and ATBS the same chemical?

In industrial trade, AMPS and ATBS commonly refer to the same acid-form monomer with CAS number 15214-89-8. Buyers should still verify the CAS number and product form because supplier terminology can vary.

Is AMPS the same as sodium AMPS?

No. Sodium AMPS, also called NaAMPS or NaATBS, is the sodium salt and normally has CAS number 5165-97-9. It differs from AMPS acid in molecular weight, pH, sodium content and physical form.

Is AMPS soluble in water?

Yes. AMPS is readily soluble in water. Dissolution speed depends on particle form, water temperature, agitation and concentration.

Is AMPS an additive or a monomer?

AMPS is primarily a reactive monomer. It is normally polymerized or copolymerized so that sulfonic functionality becomes part of the resulting polymer.

Can AMPS be used directly in water treatment?

AMPS is generally used to manufacture water-treatment polymers rather than being added directly as the finished treatment chemical. The final polymer may function as a dispersant, scale-control polymer, flocculant or other treatment component.

Why is AMPS used in salt-tolerant polymers?

AMPS introduces strongly ionic sulfonate groups after neutralization. These groups can help polymers remain hydrated and functional in electrolyte-containing water. The actual salt tolerance depends on the complete polymer composition and operating conditions.

Can AMPS be homopolymerized?

AMPS can be polymerized alone or copolymerized with other vinyl monomers. The appropriate route depends on the target molecular structure and application.

What purity is available?

AOZUN supplies high-purity commercial AMPS, commonly with a typical purity of at least 99.0%. Final specifications should be confirmed in the sales contract and batch COA.

What are the most important AMPS quality indicators?

The main indicators include purity, acid value, water, iron, nonvolatile matter, physical appearance and solution color. The relative importance of each parameter depends on the final polymer.

Is industrial AMPS suitable for personal-care or biomedical products?

Not automatically. These applications may require special impurity limits, residual-monomer control, regulatory documentation and application-specific qualification. Buyers should disclose the intended regulated use before ordering.

How should AMPS be stored?

Store AMPS in sealed packaging in a cool, dry, shaded and well-ventilated location. Protect it from moisture, heat, sunlight, incompatible chemicals and contamination.

Can AOZUN provide an AMPS sample?

Sample availability can be confirmed based on destination, grade and application. Provide the required quantity and delivery information when submitting an inquiry.

Request an AMPS/ATBS Sample or Quotation

AOZUN supplies 2-acrylamido-2-methylpropane sulfonic acid for industrial polymerization and international distribution.

Contact AOZUN with your required purity, quantity, application, packaging and delivery destination. Our team will confirm the appropriate grade, current specification, documentation, availability and commercial terms.