Ultralow sulphur expandable graphite, 80mesh

Catalog NumberACMA00023508

CategoryExpandable Graphite

Description	Expandable graphite is one optimal material for fire-retardant applications. This expandable graphite is halogen-free, cost-effective when heated resulting in an increase in volume of up to 250-450 times. The resulting expanded flakes are referred to as "char", and provide unique fire retardant properties.
Content	Carbon content: 85-99.5%; Sulphur content: ≤0.02%
Expanded Temperature	≥950℃
Expansion Volume	150-250 ml/g
Feature	1)Expandable Graphite has features of good expandable, 2)Expandable Graphite has the Features of high temperature resistance, 3)It is suitable for a wide range of applications 4)Corrosion resistant 12)Not Harmful to health
Moisture Content	≤1%
Packaging	5kgs-25kgs
pH	3-7
Size	80mesh
Volatiles	≤10%

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Case Study

Application of Expandable Graphite in Flame Retardant PA6

Tomiak, Florian, et al. Polymers, 2021, 13(16), 2733.

Polyamide 6 incorporated expandable graphite (EG) as a flame retardant additive at different loading levels. The evaluation process consisted of Cone Calorimeter analysis and LOI and UL-94 tests plus rheological, electrical and thermal property measurements.
Key Findings
· Cone calorimeter experiments indicate that a minimum EG loading of 15 wt.% (8.6 vol.%) is essential for notable flame retardancy in PA6. Sample conditions significantly influenced total heat emitted (THE) and total smoke production (TSP). On average, humid-conditioned samples showed a 16% reduction in THE and a 22% decrease in TSP. Additionally, sensitivity to time to ignition (Tign) and peak heat release rate (pHRR) was observed in both pure PA6 and at low heat fluxes.
· Flammability assessments revealed that PA6/EG formulations exhibited reduced effectiveness. Humid-conditioned samples with 20 wt.% and dried samples with 25 wt.% achieved V-0 classification in UL-94 tests. Increased loading levels raised the heat conductivity of pure PA6 from 0.27 W/(m*K) to 0.89 W/(m*K) when 25 wt.% EG was included.
· Viscosity measurements demonstrated that melt volume rate (MVR) values rose with increased loading to reach 114 cm3/10 min for PA6 at 25 wt.% loading. Complex viscosity measurements from rotational testing revealed shear-thinning behavior due to EG incorporation but showed initial increase at 15 wt.% EG followed by a decrease at both 20 wt.% and 25 wt.% EG levels.

Synergistic Effect of Expandable Graphite and Intumescent Flame Retardant for Polypropylene

Zheng, Zaihang, et al. Journal of Materials Science, 2016, 51, 5857-5871.

This work aimed to investigate the synergistic effect of intumescent flame retardant (IFR) and expandable graphite (EG) in improving the char quality during combustion of polypropylene (PP) composites. The IFR system consisted of melamine polyphosphate (MPP) and dipentaerythritol (DPER), which act as acid source and char former, respectively.
· Preparation of Flame-Retardant PP Composites
The PP and flame retardants underwent melt-mixing in a twinroller mill for 15 minutes at temperatures ranging from 180 to 190 °C. The roller speed was 30 rpm. The samples underwent a hot-pressing process at 190 °C under 10 MPa for 10 min to form measurement-ready sheets. Table 1 contains the full formulation details.
· Synergistic Flame Retardant Effect of IFR and EG
Adding EG into the PP/IFR system shows significant enhancements in PP materials' flame-retardant properties according to LOI and UL-94 tests. The data shows that the IFR/EG system presents a synergistic effect which enhances PP's flame-retardant properties. FTIR analysis of residues from the MPP/DPER/EG system demonstrates that char formation takes place predominantly between 350 and 400 °C. The thermal decomposition and oxidation studies further explore the thermal behavior of these PP composites, shedding light on the synergistic interaction between IFR and EG in facilitating the char formation process.

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