Thickeners in PTFE emulsion serve four critical functions: suspension stabilization (prevents settling of dense PTFE particles), shear-thinning behavior (high viscosity at rest, low under agitation for easy coating), penetration depth control (regulates resin loading on fiberglass fabric), and film uniformity (prevents cracking during drying). Critical requirement: thickeners must decompose completely at ~380°C sintering temperature, leaving zero ash residue to maintain coating purity and electrical insulation.