90 1 glue. 80 1 glue is a kind of building glue, which is formed by polycondensation of polyvinyl alcohol and formaldehyde in acidic medium and then amination. Formaldehyde will be produced in the preparation process, and 90 1 is a two-component black flame-retardant and heat-conductive epoxy potting adhesive with low viscosity and good fluidity, which can easily penetrate into the gaps of products. Its main components are polyvinyl alcohol, water and KJ200 thickener, and it has been put into production.