PTFE being matrix and graphite being reinforcement, has to be sintered after compaction.
I refer to the previous question on the researchgate link below please go through to see that it is not easy to do the compaction directly.
Best regards
https://www.researchgate.net/post/If_particle_size_of_both_PTFE_and_graphite_is_35_micron_can_compactiion_happensKIndly_let_me_know_how_much_difference_should_be_in_particle_size
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