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Melamin Sulfonate is a commercial designation commonly referring to a water-soluble sulfonated melamine–formaldehyde condensate, typically supplied as its sodium salt.
Melamin Sulfonate belongs to the family of anionic condensation polymers whose sulfonate groups promote water solubility and mineral-particle dispersion.
Melamin Sulfonate principally functions as a superplasticizer and water-reducing additive in concrete, cementitious mortars, grouts, and calcium sulfate-based construction materials.
CAS Number: 64787-97-9, for the sodium bisulfite–melamine–formaldehyde polymer covered here
EC Number: 613-691-4, European inventory/list identifier reported for this polymer
Molecular Formula: Variable; polymeric composition without a single molecular formula
Molecular Weight: Variable; dependent on polymerization, molecular-weight distribution, and grade [Rigoletto]
Synonyms: Melamine Sulfonate, Melamine Sulphonate, Sulfonated Melamine, Sulfonated Melamine Formaldehyde, Sulphonated Melamine Formaldehyde, Sulfonated Melamine Formaldehyde Condensate, Sulphonated Melamine Formaldehyde Condensate, Sulfonated Melamine Formaldehyde Polycondensate, Sulfonated Melamine Formaldehyde Resin, Sulfonated Melamine Formaldehyde Polymer, Melamine Formaldehyde Sulfonate, Melamine Formaldehyde Sulfonate Sodium Salt, Sodium Melamine Formaldehyde Sulfonate, Polymelamine Sulfonate, Sulfite-Modified Melamine Resin, Formaldehyde-Melamine-Sodium Bisulfite Copolymer, Melamine-Formaldehyde-Sodium Bisulfite Polymer, Formaldehyde-Melaminesulfonic Acid Copolymer Sodium Salt, Melaminesulfonic Acid-Formaldehyde Copolymer Sodium Salt, Sulfurous Acid Monosodium Salt Polymer with Formaldehyde and 1,3,5-Triazine-2,4,6-Triamine, Sulfurous Acid Sodium Salt (1:1) Polymer with Formaldehyde and 1,3,5-Triazine-2,4,6-Triamine, 1,3,5-Triazine-2,4,6-Triamine Polymer with Formaldehyde and Sodium Hydrogen Sulfite, Formaldehyde Polymer with Sodium Hydrogen Sulfite and 1,3,5-Triazine-2,4,6-Triamine, SMF, SMFC, MFS, PMS, Melamine-Based Anionic Dispersant, Melamine-Based High-Range Water Reducer, CAS 64787-97-9
APPLICATIONS
Melamin Sulfonate serves as a high-range water-reducing admixture in concrete by dispersing cement particles and releasing water trapped within particle agglomerates.
Melamin Sulfonate increases fresh-mixture fluidity without requiring a corresponding increase in mixing water.
Additionally, Melamin Sulfonate permits a lower water-to-cement ratio at a specified consistency, supporting higher strength when the mixture is properly proportioned and cured.
Melamin Sulfonate requires compatibility evaluation because cement composition, dosage, temperature, and mixing conditions influence workability and setting behavior.
Melamin Sulfonate supports the formulation of flowable cementitious screeds and self-levelling underlayments.
Melamin Sulfonate reduces particle flocculation, allowing a mortar to spread more readily under its own weight.
Moreover, Melamin Sulfonate helps formulators achieve useful flow while controlling the water demand of the binder system.
Melamin Sulfonate must be balanced with stabilizers and other rheology modifiers to maintain suspension stability and limit segregation.
Melamin Sulfonate contributes to the flow properties of non-shrink grouts and machinery grouts.
Melamin Sulfonate enables cementitious mixtures to fill narrow spaces and complex voids through improved binder dispersion.
In addition, Melamin Sulfonate allows adequate placement consistency at a lower water content than an otherwise comparable unplasticized formulation.
Melamin Sulfonate provides water reduction rather than an intrinsic expansion mechanism, so non-shrink performance depends on the complete grout formulation.
Melamin Sulfonate functions as a dispersing additive in gypsum and anhydrite-based mortars and flowing floor screeds.
Melamin Sulfonate lowers the water required to obtain a workable calcium sulfate suspension.
Additionally, Melamin Sulfonate can support a denser hardened structure when reduced mixing water limits the pores left after drying.
Melamin Sulfonate grades optimized for calcium sulfate binders require separate evaluation of flow retention, setting time, and compatibility with accelerators or retarders.
Melamin Sulfonate improves mixing and consistency in selected cement-based tile adhesives and joint fillers.
Melamin Sulfonate helps distribute fine binder particles within formulations containing mineral fillers and other construction additives.
Furthermore, Melamin Sulfonate can reduce the water needed to obtain the intended application consistency.
Melamin Sulfonate must be coordinated with cellulose ethers, redispersible polymers, and rheology modifiers because adhesive performance also depends on water retention, open time, and resistance to sagging.
Melamin Sulfonate assists the development of cementitious repair mortars and feather-edge levelling products.
Melamin Sulfonate supports workable mixtures with controlled water content, helping maintain the strength potential of the binder.
Moreover, Melamin Sulfonate improves the dispersion of cement fines during mixing and placement.
Melamin Sulfonate selection should reflect the required consistency, layer thickness, working time, and compatibility with the remaining repair-mortar ingredients.
Melamin Sulfonate participates in selected plaster, render, and skim-coat formulations as a mixing and workability additive.
Melamin Sulfonate reduces binder agglomeration and helps produce a more uniform mineral paste.
Additionally, Melamin Sulfonate offers a means of adjusting consistency without relying entirely on additional water.
Melamin Sulfonate dosage must preserve the intended balance between spreadability, adhesion, and resistance to downward movement on vertical surfaces.
Melamin Sulfonate is incorporated into selected cementitious waterproofing mortars to improve dispersion and application consistency.
Melamin Sulfonate supports lower-water formulations that can develop a more compact cementitious matrix.
In addition, Melamin Sulfonate complements other ingredients responsible for adhesion, flexibility, or specialized waterproofing behavior.
Melamin Sulfonate does not independently establish waterproofing performance or drinking-water-contact suitability, which depend on the exact formulation and applicable product requirements.
DESCRIPTION
Melamin Sulfonate covered in this profile is a sulfonated melamine–formaldehyde condensation polymer associated with the sodium bisulfite polymer registry entry.
Melamin Sulfonate contains nitrogen-rich triazine units within a polymeric structure carrying anionic sulfonate functionality.
Melamin Sulfonate consequently represents a distribution of polymer molecules rather than a discrete compound with one molecular weight.
Additionally, Melamin Sulfonate should be distinguished from unmodified melamine, ordinary melamine–formaldehyde thermosetting resin, and individual melamine salts of sulfonic acids.
Melamin Sulfonate is commercially available as a powder or as an aqueous preparation whose concentration is specified separately.
Melamin Sulfonate powder grades commonly appear white, off-white, or slightly colored and may be produced by spray drying.
Moreover, Melamin Sulfonate dissolves in water, while solution viscosity and appearance vary with concentration and polymer grade.
Melamin Sulfonate has no single sharp melting point or useful normal boiling point applicable to the entire commercial polymer family.
Melamin Sulfonate adsorbs onto mineral-particle surfaces and promotes dispersion primarily through electrostatic repulsion.
Melamin Sulfonate can therefore lower the water demand and alter the rheology of cementitious suspensions.
Furthermore, Melamin Sulfonate performance depends on molecular-weight distribution, sulfonation, binder chemistry, and formulation conditions.
Melamin Sulfonate grades may differ in solids content, moisture, residual salts, alkalinity, and free formaldehyde, making grade-specific documentation important.
Melamin Sulfonate safety classification depends on the commercial grade, residual constituents, and regional labeling rules.
Melamin Sulfonate dust can cause discomfort or irritation, and some grades carry combustible-dust precautions or warnings related to residual formaldehyde.
Additionally, Melamin Sulfonate grades with low residual formaldehyde may have a different hazard profile from preparations containing higher residual levels.
Melamin Sulfonate requires protection against uncontrolled environmental release, with a German water-hazard classification of WGK 1 recorded specifically for sulfite-modified melamine resin containing less than 0.1% residual formaldehyde.
PROPERTIES
Product Name: Melamin Sulfonate
Common Chemical Name: Sulfonated melamine–formaldehyde condensate
Chemical Family: Sulfonated amino-resin condensation polymers
Functional Class: Anionic polymeric dispersant and superplasticizer
CAS Number: 64787-97-9, for the sodium bisulfite–melamine–formaldehyde polymer
EC/List Number: 613-691-4
Registry Name: Sulfurous acid, sodium salt (1:1), polymer with formaldehyde and 1,3,5-triazine-2,4,6-triamine
Common Abbreviations: SMF, MFS; PMS in selected technical literature
Molecular Formula: Variable; no single molecular formula
Molecular Weight: Variable; grade-dependent molecular-weight distribution
Typical Counterion: Sodium, for the polymer form covered here
Physical State: Solid powder; aqueous commercial preparations also available
Representative Powder Appearance: White to off-white or slightly colored
Representative Odor: Weak or characteristic; grade dependent
Water Solubility: Water soluble
Representative Bulk Density: Approximately 500–800 kg/m³ for selected spray-dried powder grades
Representative Solution pH: Approximately 9.0–11.4 for a 20% aqueous solution at 20 °C in a documented powder grade
Melting Point: No universal value established for the commercial polymer family
Boiling Point: Not applicable as a characteristic boiling point of the polymer
Volatility: Low for the polymer; residual volatile constituents must be assessed separately
Flash Point: Not applicable to the solid polymer powder
Viscosity: Concentration, temperature, molecular-weight distribution, and grade dependent
Residual Formaldehyde: Grade dependent; verify the specification and SDS
Primary Industrial Function: Mineral-particle dispersion and reduction of binder water demand
Major Applications: Concrete, self-levelling mortars, screeds, grouts, gypsum products, tile adhesives, repair mortars, and selected waterproofing mortars
Hazard Classification: Grade and jurisdiction dependent; the current regional supplier SDS controls workplace labeling
Dust Hazard: Some powder grades require combustible-dust precautions
Incompatible Materials: Strong oxidizing agents; strong acids, bases, or reducing agents where identified by the grade-specific SDS
Thermal-Decomposition Products: Carbon oxides, sulfur oxides, and other decomposition fumes
Transport Information: Representative grades are not regulated as dangerous goods; verify the actual product SDS
UN Number: Not assigned for grades supplied as non-dangerous goods
Storage Conditions: Cool, dry storage in tightly closed original packaging
Storage Protection: Protect powder from moisture and excessive heat; follow separate storage limits for aqueous preparations
Shelf Life: Grade, purity, packaging, storage conditions, and manufacturer dependent
Regulatory Suitability: Application and grade dependent; construction use does not establish suitability for food, pharmaceutical, cosmetic, or drinking-water-contact applications.
FIRST AID
Inhalation:
Move the affected person to fresh air and keep comfortable.
Obtain medical advice if coughing or respiratory irritation persists.
Seek urgent medical assistance for breathing difficulty.
Skin Contact:
Remove contaminated clothing and wash exposed skin thoroughly with soap and water.
Seek medical advice if irritation or a rash develops.
Wash contaminated clothing before reuse.
Eye Contact:
Rinse immediately with clean, gently flowing water for at least 15 minutes, keeping the eyelids open.
Remove contact lenses if present and easy to remove.
Obtain medical attention for persistent pain, redness, or visual disturbance.
Ingestion:
Rinse the mouth with water.
Do not induce vomiting.
Contact a poison center or physician for significant ingestion or symptoms, and never give anything by mouth to an unconscious person.
Note to Physicians:
Treat according to symptoms and the actual grade’s SDS.
Consider residual formaldehyde and other formulation constituents when assessing irritation or allergic symptoms.
No specific antidote is identified for the polymer.
HANDLING AND STORAGE
Handling:
Avoid generating or inhaling dust and prevent prolonged skin or eye contact.
Use controlled transfer methods and maintain good workplace hygiene.
Wash hands before eating or drinking.
Engineering Controls:
Provide effective ventilation and local extraction at powder charging and mixing points.
Assess residual formaldehyde exposure where relevant to the grade and process.
Personal Protection:
Wear protective gloves, suitable work clothing, and safety glasses.
Use splash goggles for liquid handling or where eye exposure is likely.
Respiratory Protection:
Select an approved particulate respirator when ventilation does not adequately control dust.
Where formaldehyde exposure is possible, respiratory protection must address that vapor hazard separately and follow an appropriate workplace respiratory-protection program.
Fire and Static Control:
Apply the combustible-dust precautions specified for the actual powder grade.
Prevent dust accumulation, control ignition sources, and ground and bond transfer equipment where required.
Use suitably designed dust-collection equipment and avoid cleaning with compressed air.
Storage:
Keep powder in tightly closed original packaging in a cool, dry location.
Protect against moisture, direct heat, and packaging damage.
Store aqueous preparations within the manufacturer’s specified temperature range.
Material Compatibility:
Separate from strong oxidizing agents.
Avoid contact with other reactive chemicals identified as incompatible in the product SDS.
Spill and Leak Procedures:
Restrict access and recover spilled powder without raising dust, using a suitable industrial vacuum or controlled collection method.
Contain liquid preparations and collect them with compatible absorbent material.
Place recovered material in labeled containers for appropriate disposal.
Environmental Precautions:
Prevent uncontrolled discharge to drains, soil, groundwater, or surface water.
Contain contaminated cleaning water and firefighting runoff.
Fire Response:
Use water spray, foam, dry chemical, or carbon dioxide as appropriate to the surrounding fire.
Firefighters should wear self-contained breathing apparatus and protective clothing because decomposition fumes may contain carbon and sulfur oxides.
Waste Disposal:
Dispose of residues, absorbents, and contaminated packaging through an authorized waste-management route in accordance with applicable regulations.
