Polyphase 663 Troy Preservatives / Biocides / Fungicides ADHESIVE SEALANT Polyphase 663 Fungicide/algaecide Polyphase 663 is designed to protect adhesives and sealants from algal and fungal attack. Polyphase 663 is very econoimical product that provides broad-spectrum protection with safeguard from discoloration while lowering overall system VOC's. Polyphase 663 has an excellent toxicology profile and poses fewer hazards to handlers than conventional biocides. Fungicide/algaecide. Used in adhesives and sealants. Provides broad-spectrum protection and protection from discoloration. Reduces VOC content. Offers very good toxicology profile.