Thioplast G 21 Polysulphide polymer Akzo Nobel-Akcros Chemicals Polysulfides SEALANT Thioplasts are in general a widely used base for different kinds of sealants. Thioplast G21 is a liquid Polysulphide Polymer of medium viscosity and of a light brown colour. Thioplast G21 is the most used Thioplast-Type for insulating glass sealant. Using various fillers, plasticizers and special modifying additives it is possible to adjust the properties of Thioplast polymers in order to meet the specific application requirements of insulating glass sealant and to reduce the material costs.Moreover G 21 is used in building and industrial sealants. Polysulphide polymer. Used as a base for insulating glass, building and industrial sealants. Offers medium viscosity and light brown colour. Can be used in combination with various fillers, plasticizers and special modifying additives.