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Anionic polyacrylamide PAM is a high-molecular-weight water-soluble anionic polymer used primarily as a flocculant and process aid.
Anionic polyacrylamide PAM promotes solid-liquid separation through adsorption, polymer bridging, particle aggregation, and modification of suspension behavior.
Anionic polyacrylamide PAM is available in different molecular weights, charge densities, residual-monomer specifications, and physical forms.
CAS Number: Variable by composition; 9003-05-8 is commonly associated with the polyacrylamide backbone, while composition-specific anionic copolymers may use different identifiers
EC Number: Not assigned as one universal number to all Anionic polyacrylamide PAM grades
Molecular Formula: [C₃H₅NO]x[C₃H₃O₂M]y, where M represents a positive counterion and x and y vary by grade
Molecular Weight: Grade dependent; commonly within the high to very high molecular-weight range
SYNONYMS
Anionic Polyacrylamide, Anionic PAM, PAM Anionic Polymer, Anionic polyacrylamide PAM, APAM, A-PAM, Anionic Polyacrylamide Polymer, Anionic Polyacrylamide Copolymer, Anionic Polyacrylamide Flocculant, Anionic Acrylamide Polymer, Acrylamide-Acrylate Copolymer, Acrylamide-Acrylic Acid Copolymer, Acrylamide-Sodium Acrylate Copolymer, Poly(Acrylamide-co-Acrylic Acid), Poly(Acrylamide-co-Sodium Acrylate), Sodium Acrylate-Acrylamide Copolymer, Acrylic Acid-Acrylamide Copolymer, Partially Hydrolyzed Polyacrylamide, Hydrolyzed Polyacrylamide, HPAM, Anionic Polyelectrolyte, Anionic Polymer Flocculant, Anionic Water-Soluble Polymer, High-Molecular-Weight Anionic Polymer, Water-Treatment Polyacrylamide, Wastewater-Treatment Polyacrylamide, Industrial Polymer Flocculant, Mineral Processing Flocculant, Mining Flocculant, Tailings Flocculant, Sludge-Settling Polymer, Solid-Liquid Separation Polymer, Sedimentation Aid, Clarification Aid, Coagulant Aid, Polymer Bridging Flocculant, Suspended-Solids Flocculant, Turbidity-Reduction Polymer, Paper Retention Aid, Paper Drainage Aid, Pulp-and-Paper Flocculant, Soil-Stabilizing Polyacrylamide, Erosion-Control Polyacrylamide, Irrigation PAM, Agricultural Anionic PAM, Construction-Site PAM, Dry Anionic Polyacrylamide, Powder Anionic Polyacrylamide, Granular Anionic Polyacrylamide, Emulsion Anionic Polyacrylamide, Liquid Anionic Polyacrylamide, Low-Charge Anionic Polyacrylamide, Medium-Charge Anionic Polyacrylamide, High-Charge Anionic Polyacrylamide
APPLICATIONS
Anionic polyacrylamide PAM serves as a flocculation aid in raw-water clarification systems containing suspended clay, silt, and mineral particles.
Anionic polyacrylamide PAM increases effective floc size and settling velocity when molecular weight, charge density, dosage, and mixing conditions are correctly selected.
Anionic polyacrylamide PAM supports drinking-water clarification only when a specifically certified low-residual-monomer grade is legally authorized.
Anionic polyacrylamide PAM dosage and residual acrylamide content must comply with applicable drinking-water standards and local regulations.
Anionic polyacrylamide PAM functions in municipal wastewater clarification processes requiring improved removal of suspended solids.
Anionic polyacrylamide PAM can assist sedimentation after biological or physicochemical treatment when laboratory testing confirms compatibility with the wastewater.
Anionic polyacrylamide PAM contributes to industrial wastewater treatment by bridging fine particles into larger and more readily separable flocs.
Anionic polyacrylamide PAM can improve clarification efficiency when combined with an appropriate inorganic coagulant or primary destabilization stage.
Anionic polyacrylamide PAM supports treatment of wastewater containing coagulated mineral solids, pigments, fibers, or other suspended process residues.
Anionic polyacrylamide PAM requires dosage optimization because both insufficient polymer and polymer overdosing can reduce separation efficiency.
Anionic polyacrylamide PAM functions in sludge thickening processes where appropriately conditioned solids require faster gravity separation.
Anionic polyacrylamide PAM must be compared with nonionic and cationic alternatives because sludge surface chemistry varies between treatment processes.
Anionic polyacrylamide PAM contributes to mechanical sludge dewatering through belt presses, filter presses, centrifuges, or screw-type equipment.
Anionic polyacrylamide PAM can improve water release when the selected grade produces flocs that withstand the shear conditions of the equipment.
Anionic polyacrylamide PAM serves as a tailings flocculant in mining operations requiring faster settling and improved process-water recovery.
Anionic polyacrylamide PAM performance depends on mineralogy, particle-size distribution, slurry concentration, water chemistry, mixing energy, and the required dewatering endpoint.
Anionic polyacrylamide PAM supports mineral-thickener operations by aggregating fine particles into settleable flocs.
Anionic polyacrylamide PAM can improve overflow clarity while underflow density and floc strength remain dependent on grade and process conditions.
Anionic polyacrylamide PAM functions in iron-ore and hematite processing systems containing ultrafine suspended mineral particles.
Anionic polyacrylamide PAM can support sedimentation or selective-flocculation processes after pH, dosage, and competing adsorption interactions are optimized.
Anionic polyacrylamide PAM contributes to coal-washing wastewater clarification and fine-coal settling systems.
Anionic polyacrylamide PAM assists separation of mineral fines from process water when solids concentration, pH, ionic strength, and mixing are controlled.
Anionic polyacrylamide PAM supports sand, gravel, and aggregate-washing operations that recycle process water.
Anionic polyacrylamide PAM accelerates settling of suspended mineral fines before clarified water is returned to the washing circuit.
Anionic polyacrylamide PAM functions in dredging and sediment-handling operations involving fine mineral suspensions.
Anionic polyacrylamide PAM can prepare suspended sediment for gravity settling, geotextile dewatering, filtration, or mechanical separation.
Anionic polyacrylamide PAM contributes to drilling-slurry and excavation-water treatment where suspended clay and mineral solids require removal.
Anionic polyacrylamide PAM should be selected according to slurry composition because some clays, salts, and treatment additives can reduce polymer performance.
Anionic polyacrylamide PAM supports pulp-and-paper wastewater treatment for removal of suspended fibers, fillers, and process solids.
Anionic polyacrylamide PAM can produce larger and more readily separable flocs in wastewater with suitable particle and ionic characteristics.
Anionic polyacrylamide PAM functions in papermaking retention programs involving fibers, mineral fillers, fines, and compatible cationic components.
Anionic polyacrylamide PAM can improve retention and drainage when incorporated into a properly designed single-component or dual-component program.
Anionic polyacrylamide PAM contributes to textile and dyeing wastewater treatment after color-bearing and suspended contaminants have been destabilized.
Anionic polyacrylamide PAM does not independently guarantee removal of dissolved dyes and should be combined with suitable chemical, physical, or biological treatment.
Anionic polyacrylamide PAM supports clarification of food-processing wastewater containing suspended organic and mineral residues.
Anionic polyacrylamide PAM must be evaluated against wastewater composition, sludge characteristics, downstream treatment, and applicable discharge requirements.
Anionic polyacrylamide PAM functions in authorized sugar-processing clarification applications when a compliant food-processing grade is selected.
Anionic polyacrylamide PAM must meet the applicable purity, residual-monomer, dosage, and food-processing requirements before use.
Anionic polyacrylamide PAM contributes to enhanced-oil-recovery systems by increasing the viscosity of injected water.
Anionic polyacrylamide PAM can improve mobility control and reservoir sweep efficiency when salinity, hardness, temperature, shear, and rock compatibility are suitable.
Anionic polyacrylamide PAM supports oilfield injection-water and produced-water treatment systems requiring rheology modification or enhanced solids separation.
Anionic polyacrylamide PAM must be evaluated with demulsifiers, coagulants, flotation units, filters, and reservoir-protection requirements.
Anionic polyacrylamide PAM serves as a temporary soil-binding agent for agricultural erosion-control programs.
Anionic polyacrylamide PAM stabilizes soil aggregates and flocculates suspended sediment when an approved water-soluble anionic grade is correctly applied.
Anionic polyacrylamide PAM supports furrow-irrigation management by reducing soil loss and sediment transport in runoff.
Anionic polyacrylamide PAM application must reflect soil texture, slope, irrigation method, water chemistry, local standards, and the applicable conservation plan.
Anionic polyacrylamide PAM functions on disturbed construction soil to reduce erosion before permanent stabilization becomes established.
Anionic polyacrylamide PAM should be used with controlled dosing and sediment-management measures to prevent unnecessary polymer release.
Anionic polyacrylamide PAM contributes to construction stormwater clarification by flocculating suspended clay and soil particles.
Anionic polyacrylamide PAM requires site-specific testing because soil mineralogy, turbidity, pH, hardness, and receiving-water sensitivity influence performance.
Anionic polyacrylamide PAM supports process development, jar testing, pilot trials, and laboratory evaluations of solid-liquid separation.
Anionic polyacrylamide PAM can be screened for settling rate, supernatant clarity, floc strength, filtration, dewatering, dosage efficiency, and shear recovery.
DESCRIPTION
Anionic polyacrylamide PAM is a family of water-soluble polymers containing acrylamide units and negatively charged functional groups.
Anionic polyacrylamide PAM can be produced by copolymerizing acrylamide with acrylic acid or an acrylate salt.
Anionic polyacrylamide PAM can also be produced through partial alkaline hydrolysis of nonionic polyacrylamide.
Anionic polyacrylamide PAM is therefore frequently described as partially hydrolyzed polyacrylamide or HPAM.
Anionic polyacrylamide PAM is not one chemically uniform substance with a fixed molecular weight or anionic charge.
Anionic polyacrylamide PAM composition varies according to monomer ratio, hydrolysis level, counterion, chain length, branching, and manufacturing method.
Anionic polyacrylamide PAM has a repeating structure commonly represented as [C₃H₅NO]x[C₃H₃O₂M]y.
Anionic polyacrylamide PAM uses M to represent a positive counterion associated with the negatively charged carboxylate groups.
Anionic polyacrylamide PAM commonly contains carboxylate functionality derived from acrylic acid, sodium acrylate, or hydrolyzed acrylamide units.
Anionic polyacrylamide PAM can adopt a more extended chain conformation as repulsion between negatively charged groups increases.
Anionic polyacrylamide PAM flocculates many suspensions primarily through adsorption and polymer bridging.
Anionic polyacrylamide PAM forms bridges when different segments of a long polymer chain adsorb onto multiple particles.
Anionic polyacrylamide PAM can produce large and relatively open floc structures without fully neutralizing particle charge.
Anionic polyacrylamide PAM performance depends on the availability of adsorption sites and the conformation of the hydrated polymer chain.
Anionic polyacrylamide PAM is available as dry powder, granules, aqueous solution, inverse emulsion, dispersion, or another formulated delivery form.
Anionic polyacrylamide PAM physical form determines storage requirements, preparation equipment, activation time, dosing procedure, and spill behavior.
Anionic polyacrylamide PAM dry grades commonly appear as white to off-white granular or powdered solids.
Anionic polyacrylamide PAM liquid grades can contain water, carrier fluids, surfactants, stabilizers, or other formulation ingredients.
Anionic polyacrylamide PAM produces highly viscous aqueous solutions at relatively low polymer concentrations.
Anionic polyacrylamide PAM solution viscosity increases strongly with molecular weight, concentration, chain expansion, and hydration.
Anionic polyacrylamide PAM powder must be added gradually to agitated water to prevent surface hydration and formation of gelatinous lumps.
Anionic polyacrylamide PAM normally requires an appropriate aging period before the polymer chains become fully hydrated and effective.
Anionic polyacrylamide PAM can undergo irreversible molecular-chain degradation under excessive mechanical shear.
Anionic polyacrylamide PAM should be mixed strongly enough for dispersion but gently enough to preserve hydrated chain length.
Anionic polyacrylamide PAM performance is influenced by pH, temperature, dissolved salts, water hardness, suspended-solids concentration, and mixing energy.
Anionic polyacrylamide PAM can lose effective chain expansion or develop cloudiness and precipitation in unsuitable high-salinity or multivalent-ion conditions.
Anionic polyacrylamide PAM quality is commonly controlled through molecular-weight range, anionic charge, moisture, dissolution rate, viscosity, and residual acrylamide testing.
Anionic polyacrylamide PAM residual-monomer requirements become especially important in drinking-water, food-processing, agricultural, and environmental applications.
Anionic polyacrylamide PAM polymer must be distinguished from residual acrylamide monomer remaining from polymer manufacture.
Anionic polyacrylamide PAM intended for sensitive uses should be selected by certified residual-acrylamide content rather than polymer performance alone.
Anionic polyacrylamide PAM used for qualified agricultural erosion control must satisfy application-specific composition and purity criteria.
Anionic polyacrylamide PAM meeting current EPA mitigation criteria contains no more than 0.05% acrylamide monomer and has specified charge-density and molecular-weight ranges.
Anionic polyacrylamide PAM should not be replaced with cationic polyacrylamide in erosion-control applications.
Anionic polyacrylamide PAM is specifically distinguished from cationic PAM because cationic forms present greater toxicity concerns for aquatic organisms.
Anionic polyacrylamide PAM is generally stable as a dry polymer when protected from moisture, heat, oxidation, and ultraviolet exposure.
Anionic polyacrylamide PAM prepared solutions can gradually lose activity through aging, contamination, biological growth, hydrolysis, or mechanical degradation.
Anionic polyacrylamide PAM creates extremely slippery surfaces when powder or solution becomes wet.
Anionic polyacrylamide PAM spills require immediate containment and careful cleanup to prevent falls and uncontrolled environmental release.
PROPERTIES
Chemical Class: Anionic Water-Soluble Polyacrylamide
Polymer Type: Acrylamide-Acrylate Copolymer or Partially Hydrolyzed Polyacrylamide
Physical Form: Powder, Granule, Emulsion, Dispersion, or Solution
Appearance: Commonly White to Off-White in Dry Form
Molecular Formula: [C₃H₅NO]x[C₃H₃O₂M]y
Molecular Weight: Grade Dependent and Commonly High to Very High
Charge Type: Anionic
Charge Density: Grade and Application Dependent
Water Solubility: Water Soluble after Proper Dispersion and Hydration
Primary Function: Flocculant and Solid-Liquid Separation Aid
Main Uses: Water Treatment, Mining, Papermaking, Oilfields, and Erosion Control
Residual Acrylamide: Grade and Regulatory Application Dependent
Key Handling Concern: Extremely Slippery When Wet
Storage: Cool, Dry, Tightly Closed, and Protected from Moisture
FIRST AID
Inhalation
Move the person exposed to Anionic polyacrylamide PAM dust, mist, or aerosol into fresh air.
Obtain medical attention if Anionic polyacrylamide PAM exposure causes persistent coughing, throat irritation, breathing difficulty, or other symptoms.
Skin Contact
Remove clothing contaminated with Anionic polyacrylamide PAM and wash the affected skin thoroughly with soap and water.
Obtain medical attention if Anionic polyacrylamide PAM causes persistent irritation, redness, dryness, or another adverse skin response.
Eye Contact
Immediately rinse eyes exposed to Anionic polyacrylamide PAM with clean running water for at least 15 minutes while holding the eyelids open.
Remove contact lenses when easy to do and obtain medical attention if Anionic polyacrylamide PAM irritation, pain, or visual disturbance persists.
Ingestion
Rinse the mouth after accidental ingestion of Anionic polyacrylamide PAM and do not induce vomiting unless instructed by medical personnel.
Contact a physician or poison information center after significant Anionic polyacrylamide PAM ingestion or whenever symptoms develop.
Note to Physicians
Treat Anionic polyacrylamide PAM exposure symptomatically and provide appropriate supportive care.
Assess Anionic polyacrylamide PAM exposure according to physical form, formulation ingredients, residual monomer content, quantity, route, and symptoms.
HANDLING AND STORAGE
Handling
Handle Anionic polyacrylamide PAM using methods that minimize dust generation, splashing, and unnecessary mechanical shear.
Clean Anionic polyacrylamide PAM contamination immediately because wet polymer creates an extremely slippery walking surface.
Ventilation
Provide effective general ventilation and local dust extraction wherever powdered Anionic polyacrylamide PAM is opened, transferred, or mixed.
Use suitable respiratory protection when engineering controls cannot adequately control airborne Anionic polyacrylamide PAM dust or aerosol.
Storage
Store Anionic polyacrylamide PAM in tightly closed and moisture-resistant containers within a cool, dry, and well-ventilated area.
Protect Anionic polyacrylamide PAM from water, humidity, excessive heat, direct sunlight, oxidizing agents, and contamination.
Spill and Leak Procedures
Prevent dry Anionic polyacrylamide PAM from becoming wet and collect bulk material using suitable vacuum or dry-cleaning methods.
Prevent Anionic polyacrylamide PAM from entering drains or surface water and wash residual traces only after the bulk spill has been removed.
Handling Precautions
Wear suitable gloves, protective clothing, and safety goggles while handling Anionic polyacrylamide PAM.
Review the grade-specific Safety Data Sheet and residual-acrylamide specification before transporting, dissolving, dosing, or disposing of Anionic polyacrylamide PAM.
