Aluminium Tri-Hydroxide Modified Epoxy Resin as a Flame-Retardant Edge-Sealant to Mitigate Flammability in Drilled CFRP Composites 


Vol. 27,  No. 3, pp. 1467-1478, Mar.  2026
10.1007/s12221-025-01287-3


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  Abstract

Delamination is a key concern during carbon fiber reinforced polymer (CFRP) composite drilling operations. These delaminated areas significantly increases the flammability risks when exposed to fire. The current research presents the flammability resistance of aluminium tri-hydroxide (Al(OH)3)-modified epoxy resin as a flame-retardant edge-sealant for drilled CFRP composites. CFRP composites were manufactured using vacuum bagging method, followed by drilling with a 6 mm diameter drill bit. The samples were sized according to the ASTM standard D2863 and edge-sealed with Al(OH)3-modified epoxy resin of varying weight percentages of Al(OH)3 (25, 50 and 75 wt.%). Limiting oxygen index (LOI) tests were performed to measure the flammability of edge-sealed specimens in a given oxygen–nitrogen mixture. The results indicate that the edge-sealant significantly enhances the flame-retardant behavior by reducing the burn rate relative to neat CFRP composites. Specifically, the LOI of the CFRP composite edge-sealed with 75 wt.% of Al(OH)3-modified epoxy resin is 6.64% higher than that of neat CFRP composite. Additionally, the burn rate was reduced by 55.88% compared to the neat CFRP composites. The findings of this study highlight the impact of drilling-induced delamination and the effectiveness of Al(OH)3-modified epoxy resin as a flame-retardant edge-sealant, contributing to improved fire safety in CFRP composites.

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  Cite this article

[IEEE Style]

N. S. Narayanan, S. Vignesh, V. M. Sreehari, "Aluminium Tri-Hydroxide Modified Epoxy Resin as a Flame-Retardant Edge-Sealant to Mitigate Flammability in Drilled CFRP Composites," Fibers and Polymers, vol. 27, no. 3, pp. 1467-1478, 2026. DOI: 10.1007/s12221-025-01287-3.

[ACM Style]

N. Sathiya Narayanan, S. Vignesh, and V. M. Sreehari. 2026. Aluminium Tri-Hydroxide Modified Epoxy Resin as a Flame-Retardant Edge-Sealant to Mitigate Flammability in Drilled CFRP Composites. Fibers and Polymers, 27, 3, (2026), 1467-1478. DOI: 10.1007/s12221-025-01287-3.

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