Methylated melamine resin-303G

Haminol 303G is an advanced methylated amino-based crosslinking agent engineered with negligible formaldehyde emissions (<0.01%) and ultra-high non-volatile content (≥98%). This formaldehyde-exempt formulation demonstrates exceptional compatibility as a reactive curing component for hydroxyl-functional polymers including alkyds, polyesters, acrylics, epoxy systems, PU derivatives, and specialty fiber-reinforced composites. Its low-VOC profile supports applications in solventless high-build coatings, waterborne automotive refinishes, coil coating systems, industrial bake-on finishes, and heat-resistant graphic inks requiring minimal hazardous air pollutants.

ADVANTAGES

Solvent-free

Wide compatibility and solubility

Excellent stability

Excellent hardness-film flexibility

Fast catalyzed cure response

Low free formaldehyde content

Economical

APPLICATION AREAS

High solids finishes

Water borne finishes

Coil coatings

Automotive finishes

Container coatings

General metals finishes

Inks

TYPICAL CHARACTERISTICS
Appearance Clear, viscous liquid
Non-volatile, % by weight* 98.0 minimum
Color, Gardner 1963 1 maximum
Viscosity, Gardner-Holdt, 25°C Y-Z2
Viscosity, Cone/Plate, cps 2000-6000
Weight/gallon, pounds, approximate 10.0
Specific gravity, 25°C, approximate 1.20
Refractive index 1.515-1.520
Flash point, Setaflash, °F >200
Flash point, Tag open cup, °F >200
Free formaldehyde, weight % <0.01

SOLUBILITY PROFILE
Haminol 303G exhibits broad compatibility with conventional organic solvents such as aromatics, alcohols, esters, and ketones. While its water solubility is restricted, the resin demonstrates excellent aqueous dilution stability when formulated with water-reducible polymer blends.

CURING MECHANISM & CATALYST REQUIREMENTS
Owing to its advanced methylation degree, Haminol 303G efficiently crosslinks hydroxyl-, carboxyl-, and amide-functionalized co-resins (e.g., alkyds, acrylics, polyesters) under acidic conditions. Optimal curing necessitates catalytic activation by strong acids (pKa ≤1), though dosage adjustments may be required to counteract alkaline additives or pigments in the system.
The resin’s high functional density and resistance to self-polymerization enable superior crosslinking efficiency. In polyester-based formulations, it imparts exceptional film flexibility and thermoformability. The reactive equivalent weight typically spans 130–190 g/eq; however, precise formulation optimization—tailored to target performance metrics (e.g., adhesion, hardness)—is recommended to determine ideal loading ratios.