Melamine Cyanurate, Powder, MCA-01

Catalog NumberACMA00023481

CategoryNitrogen Flame Retardant

Molecular Weight	255.2
Molecular Formula	C6H9N9O3
Melting Point	350°C
Purity	≥ 99.5%
Density	1.35 to 1.85 (g/cm³) at 25°C
Solubility	Water solubility < 0.01 (g/100ml)
Appearance	White Granular
Application	1. primarily used for nylon 2. primarily for electrical & electronic applications (connectors, switches, etc.) made from polyamide or thermoplastic polyurethane 3. suitable for synthetic resins (i.e. PA, PVC, PS)
Decomposition Temperature	350°C
Feature	Halogen-free, low smoke density, low toxicity, and less corrosion High sublimation temperature (440°C) with high thermal resistance and thermal processing stability Good economics and mechanical properties, compared to compounds containing halogen/antimony flame retardant systems Lower corrosion offers advantages in the processing stage or fire hazard UL94V-0 rating for unfilled or mineral filled compounds UL94V-2 rating for glass filled compounds
Moisture Content	max. 0.15%
Packaging	20 kg
Particle Size	0.5 to 0.6 um
pH	5.0 - 7.0 (10g/L)
Whiteness	>=95

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Case Study

Synergistic Flame Retardant Effects of Melamine Cyanurate and Aluminum Hydroxide in Ethylene Vinyl Acetate Composites

Xu, Siyi, et al. Journal of colloid and interface science 589 (2021): 525-531.

This work was devoted to the study of synergistic flame retardant effects of combining melamine cyanurate (MCA) with aluminum hydroxide (ATH) in ethylene vinyl acetate (EVA) composites.
Preparation Procedures: EVA composites were prepared by melt-blending 100 phr EVA resin with different proportions of ATH (50-100 phr) and MCA (0-50 phr) in a laboratory mixer. The composites were compression molded at 175 °C, 18 MPa, for 5 min to prepare test sheets.
Key Findings:
· It was determined that the addition of a small amount of MCA improved the lubricity of EVA and also increased its compatibility with ATH. TGA also indicated that the addition of MCA improved the thermal stability of EVA, which was shown by the increase in the temperature of thermal decomposition.
· Combustion tests revealed that the EVA composite with 60 parts per hundred (phr) ATH and 40 phr MCA (EVA-60-40) exhibited the best isolated layer, promoting fire resistance. It also recorded the highest limiting oxygen index (LOI) of 27.5% and achieved a V-0 rating, confirming its non-combustible properties.
· The achieved results clearly demonstrated the synergistic effects of ATH and MCA, the effectiveness of the adopted approach, and a good potential of the resulting EVA-ATH-MCA composite materials for their application.

Evaluating Thermal Aging Performance of Flame Retardant Silicone Rubber Containing Melamine Cyanurate

Zhou, Cheng, et al. Journal of Applied Polymer Science 138.9 (2021): 49919.

This study examined the long-term thermal aging properties of flame retardant silicone rubber (FRSR) incorporating melamine cyanurate (MCA) as the primary flame retardant.
Methods: Flame retardant silicone rubber samples were prepared by mixing silicone rubber with MCA and other additives according to a specific formulation using a mixing mill. The compounds were laminated and cured in a vulcanizing machine, then cut into standard test bars. Samples underwent thermal aging at 210°C for durations of 504, 1008, 1512, and 2016 hours in accordance with ISO 188 standards.
Key Findings:
· The increased density of cross-linking and the breakdown of chemical bonds altered the mechanical properties of the aged samples, primarily due to the restricted segmental mobility of silicone rubber (SR). SEM images indicated that aging initiated at the surface and gradually extended inward, a finding supported by FTIR .
· As aging progressed, the initial thermal decomposition temperature decreased due to the breakdown of methylcycloaliphatic (MCA), while the residual weight rose from 30.9% to 40.0% because of chain cross-linking reactions that produced "inorganic silicon."
· Cone calorimeter testing (CCT) results showed that the decomposition of MCA slightly reduced flame retardancy. With prolonged aging, the residual material became more cohesive and denser, reflecting a decrease in released gases and indicating ongoing MCA decomposition. Additionally, aging promoted graphitized carbon formation and silicone chain self-crosslinking, enhancing barrier properties.

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