Preparation process for repellent materials against fleas, mites and insects, comprising at least two steps, the first step of which is to obtain a basic composition comprising liquid vegetable extracts, water and essential oils, and the second step of which is used to solidify the mixture by adding a solidifying premix comprising alginates, a vegetable gum and optionally solidification retarders such as dry hydrophilic plants, water chelators or other substances, even chemicals. The repellent materials are used as recharges in pockets provided in repellent collars for dogs or cats, horses or other animals, in bracelets for humans, in saddlecloths for horses and are dry and solid materials, which are kept at ambient temperature or in a refrigerator, and are stable over time, without losing the repellent value of the vegetable or natural substances included therein.
