Applications (1) joints and surrounding various large and medium hydropower dam seam. (2) a large deck, expansion joints, parapet and roof seams sealed. (3) basement, civil air defense projects, subway tunnels, culverts and drainage works in a variety of sealing seal. (4) concrete and rubber, plastic, ceramic and metal bonding and sealing materials. Flexible packing method for a variety of construction joints, cracks, chipped out 8CM wide mouth, 8CM deep "V" shaped groove, fully remove stone chips, dust and loose animals, uneven place filled with mortar, and allowed to dry. Before construction, the material first hand twisted and slit width similar thick strips; and finally fill putting knead thick strips of material sewn on the connection, so that the provisions apply high convex cylindrical surface was finally covered with PVC cover board. Construction Notes: 1, the construction principles: first crevices, after the seam, the first on both sides, after the middle. 2, the construction of the base surface must be solid and dry. 3, after the sealing material of construction is completed, must be protected from mechanical operation.