Thermal data of the pure PTFE matrix and the GNPs–PTFE nanocomposites from TGA analysis.

Samples	Weight loss temperature/°C		The heat resistance index (THRI)a/°C
	T 5	T 30
Pure PTFE	537.3	568.8	272.5
1% GNPs	532.1	562.6	269.7
5% GNPs	529.1	565.4	269.9
10% GNPs	530.4	564.1	269.8
15% GNPs	530.1	563.9	269.7
20% GNPs	529.7	563.2	269.4

^aThe heat resistance index (THRI) = 0.49 [T₅ + 0.6(T₃₀ − T₅)], T₅, T₃₀ is the decomposing temperature at 5%, 30% weight loss, respectively.³⁴