Fire spread prevention material, method for producing same, laminate, assembled battery, and automobile

A method for producing a fire spread prevention material comprising:

• a step (a) of impregnating an inorganic fiber base material with an aqueous solution comprising sodium silicate having a SiO2/Na2O mole ratio of less than 3.1;
• a step (b) of disposing a base material comprising an inorganic fiber and having a porous structure on the inorganic fiber base material impregnated with the aqueous solution to obtain a laminate comprising the aqueous solution;
• and
• a step (c) of drying the laminate,
• wherein the inorganic fiber base material comprises an inorganic fiber and an organic binder, and
• a content of the organic binder is 5 to 20 mass % based on a total mass of the inorganic fiber base material.

A laminate comprising at least:

• a layer A comprising an inorganic fiber base material and sodium silicate impregnated into the inorganic fiber base material;
• and
• a layer B comprising an inorganic fiber and having a porous structure, wherein the inorganic fiber base material comprises an inorganic fiber and an organic binder,
• a content of the organic binder is 5 to 20 mass % based on a total mass of the inorganic fiber base material, and
• a SiO2/Na2O mole ratio of the sodium silicate is less than 3.1.