Water‑based Intumescent Fire‑Retardant Coating for Steel Structure WFS‑101 Introduction: WFS‑101 Water‑based Intumescent Fire‑Retardant Coating for Steel Structure is an economical interior‑use fire protective paint, formulated with acrylic emulsion and intumescent flame‑retardant system, dilutable with clean water. Under fire condition, it expands rapidly to form dense heat‑insulating carbonized char layer to protect steel substrate from high‑temperature softening. It