- Mineral Wool Board 3BE69 provides high-temperature thermal control and fire resistance. Foil Tape 4MM48 and Metal Restraining Collar 4MM49 are for use with STI brand wrap strips. Use 4MM48 for tuck-in installation; for external mounting, use 4MM49. Packing material is for use around metallic, nonmetallic, and insulated pipe. UL classified.