In the Field
Kaolin is the chemistry behind Combat Gauze, and Combat Gauze is the CoTCCC reference product. What makes kaolin work also tells you when it might not: it accelerates the body's own clotting system, which means it depends on that system being functional. For a young, healthy trauma patient it works fast and reliably. For a patient on blood thinners or deep into hemorrhagic shock, chitosan may be the better call.
Common Mistake
Assuming kaolin works the same way in every patient regardless of clotting status or medication history.
Technical Detail
Kaolin is a naturally occurring aluminosilicate clay mineral (Al2Si2O5(OH)4) that has been used medicinally for centuries. In hemostatic dressings, kaolin is impregnated into a carrier gauze that is packed directly into a wound.
Mechanism of action. Kaolin accelerates the intrinsic pathway of the coagulation cascade by activating Factor XII (Hageman factor) on contact with blood. Factor XII activation triggers a sequential enzymatic response that produces thrombin, which in turn converts fibrinogen to fibrin. The fibrin mesh traps platelets and red blood cells to form a stable clot. In effect, kaolin does not stop bleeding directly. It accelerates the body's own clot formation at the wound site.
Clinical implications. Because kaolin relies on a functional clotting cascade, its effectiveness can be reduced in patients whose coagulation system is compromised. This includes patients on anticoagulant medications (warfarin, DOACs), patients with severe hypothermia, patients in advanced hemorrhagic shock with consumption coagulopathy, and patients with genetic coagulation disorders. In those patients, a chitosan-based dressing that works independently of the clotting cascade may be more reliable.
Safety profile. Kaolin is chemically inert, non-exothermic, and does not cause tissue damage at the wound site. It does not produce heat during application, a distinction from earlier-generation hemostatic products (such as the granular QuikClot zeolite formulation) that caused thermal injuries and are no longer recommended for field use.
Field-approved kaolin products. Combat Gauze (Z-Medica) is the primary CoTCCC-approved kaolin-based hemostatic dressing. It is supplied as a Z-folded roll of kaolin-impregnated gauze designed for wound packing.
