Description

Poly(Melamine-Co-Formaldehyde), Methylated/Butylated (55/45) is a high-performance, thermosetting amino resin widely used as a crosslinking agent. This specific 55/45 methylated/butylated ratio offers an optimal balance of reactivity, solubility, and film flexibility for demanding industrial coatings. It is an essential raw material for formulators seeking to enhance the durability, chemical resistance, and finish quality of their products. Key industries that rely on this resin include automotive, industrial maintenance, and coil coatings.

Application

• High-Performance Industrial Coatings: Primary crosslinker for thermosetting acrylic, polyester, and epoxy resins in automotive OEM and refinish paints.
• Coil and Can Coatings: Provides excellent flexibility, hardness, and corrosion resistance for pre-coated metal substrates.
• General Industrial Finishes: Used in machinery, appliance, and metal furniture coatings for superior surface protection.
• Overprint Varnishes and Inks: Enhances gloss, abrasion resistance, and chemical stability in packaging applications.
• Adhesives and Sealants: Acts as a curing agent to improve heat and moisture resistance in structural bonding formulations.
• Wood Finishes: Used in high-quality acid-curing lacquers for furniture and flooring, offering rapid cure and excellent clarity.

Basic Information

Product Name	Poly(Melamine-Co-Formaldehyde), Methylated/Butylated (55/45)
CAS No.	68036-97-5
Molecular Formula	(C4H11N6O.CH2O)x
Molecular Weight	~500-1500 g/mol (Polymer)
Synonyms	Butylated Melamine Formaldehyde Resin (55/45); Methylated/Butylated Melamine-Formaldehyde Copolymer; Amino Crosslinking Resin; HMMM-type Resin (Partially Butylated); Thermosetting Melamine Resin; Melamine-Formaldehyde Resin, Methylated and Butylated; Crosslinker MB 55/45; Coating Resin CYMEL® 303 (Analogous Type)
EINECS	Contact for details

Quality Control

Our Poly(Melamine-Co-Formaldehyde), Methylated/Butylated (55/45) is manufactured under a strict quality management system. Each batch is tested against rigorous internal specifications to ensure consistent performance, viscosity, solids content, and reactivity. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from heat sources and open flame. Under recommended conditions, the product has a typical shelf life of 12 months from the date of manufacture.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Non-Volatile Content	≥ 98.0 %
Viscosity (at 25°C)	2000 - 5000 mPa·s
Solvent (typically n-Butanol / Xylene)	Balance
Specific Gravity (at 25°C)	1.05 - 1.15
Color (Gardner)	≤ 2
Free Formaldehyde	≤ 0.5 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.