Melamine (CAS 108-78-1): From Thermoset Resins to Flame-Retardant Materials — Technical Overview
Melamine is an amino-triazine whose three exocyclic amino groups and ring nitrogen content define both its polymer chemistry and its flame-retardant performance. Condensation with formaldehyde produces melamine–formaldehyde (MF) resins — among the hardest, most stain-resistant thermosets available — while the neat compound functions as an intumescent flame retardant and nitrogen source in polyurethane foams and engineering polymers.
Sourcing quality is dominated by purity (trace biuret, cyanuric acid, and ammeline levels), whiteness, and particle-size distribution, all of which influence resin color stability and cure behavior.
Chemical Identity and Key Properties
| Property | Value |
|---|---|
| CAS Number | 108-78-1 |
| Molecular Formula | C3H6N6 |
| Molecular Weight | 126.07 g/mol |
| Density | 1.573 at 61 °F (NTP, 1992) - Denser than water; will sink |
| Solubility | less than 1 mg/mL at 72 °F (NTP, 1992) |
| Typical Purity | 99% |
Structure and Resin Chemistry
Under slightly basic conditions, melamine reacts with formaldehyde to give methylol melamines that condense on heating into cross-linked networks. The ratio of formaldehyde to melamine, pH trajectory, and cure schedule control final hardness, water resistance, and formaldehyde emission class — parameters central to wood-panel, laminate, and tableware manufacturing.
Application Areas
Laminates and Wood Adhesives
MF impregnation resins give decorative laminates their scratch, heat, and stain resistance; melamine-urea copolymers balance cost and performance in engineered-wood adhesives.
Flame Retardants
Melamine and its salts (phosphates, cyanurates, polyphosphates) act through endothermic sublimation, char promotion, and inert-gas dilution in polyurethane foams, polyamides, and intumescent coatings.
Surface and Tableware Coatings
MF-crosslinked systems deliver high-hardness, food-contact-qualified coatings for dinnerware and appliance finishes.
Concrete Plasticizers and Other Uses
Sulfonated melamine–formaldehyde condensates are high-range water reducers for concrete; melamine chemistry also appears in leather tanning and textile finishing.
Quality Control Parameters
Key specifications include purity (≥99.5% typical premium grade), moisture, formaldehyde solubility/turbidity, whiteness, ash, and particle-size distribution for resin producers. Gas evolution on sublimation and moisture-driven caking during storage are practical concerns in humid climates.
Frequently Asked Questions
What melamine purity do resin applications require?
Premium resin-grade melamine is typically ≥99.5% with tight control of moisture and cyanuric-acid-related impurities; lower grades may be suitable for some flame-retardant uses.
How is melamine shipped and stored?
In moisture-barrier bags or bulk; storage should be dry — the product is hygroscopic and cakes with humidity exposure.
Can CoreyChem supply melamine with export documentation?
Yes, CoreyChem supplies melamine with COA, MSDS, and export documentation for global shipment.
Source from CoreyChem
CoreyChem supplies Melamine (CAS 108-78-1) with lot-specific COA and MSDS documentation. Custom synthesis, higher purity grades, and bulk packaging are available on request — contact our technical team with your target specification and quantity for current lead time and pricing.