bitumen flash band/bitumen sealing tape with a self-adhesive surface of the waterproofing, sealing material, divided into with base membrane and without base membrane.And one side with self-adhesive layer and two sides with layers two kinds.The self-adhesive layer has covered with release sheept. the material of realease sheet also has a few kinds. all the self-adhesive layers no need glue, just because the adhesive of itself, which is acaused by the modified bitumen.