The answer is carbon materials. Milady's comb-materials guide states directly: combs made from carbon materials are antistatic, stiff, and heat and chemical resistant.
The book distinguishes this from graphite combs, described as less rigid than carbon-material combs though also heat and chemical resistant — a real but different material with its own separate properties. Hard rubber and metal combs are covered in the same passage too, each with different pros and cons, but antistatic specifically is the carbon-material trait.
Milady Standard Barbering, 6th ed., Ch. 5 (Implements, Tools, and Equipment), p. 105: "Combs made from carbon materials are antistatic, stiff, and heat and chemical resistant."
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