Plasticiser 680 Hydrocarbon mixture Hanse Chemie Plasticizers Silicones (Si) SEALANT hanse chemie offers two organic plasticisers for silicone elastomers. Both are highly compatible. Plasticiser 680 was developed especially for use with silicone sealants and consist of hydrocarbon mixtures. The silicone plasticiser used in an existing formulation can be partially or completely replaced by these plasticisers. Plasticiser 680 show a very good compatibility with silicone polymers of any viscosity, although its high volatility must be taken into account in the formulation. Hydrocarbon mixture plasticizer. Developed for use with silicone sealants. Possesses high volatility. Offers compatibility with silicone polymers of any viscosity.