Animal Glue is used on the hardcover production line,such as KOLBUS BF 40/523/525/526. G666 Animal Glue doesn't have formaldehyde and phthalates.It is enviromently friendly.It comfirms to RoHS, 94/62/EC,EN71-Part 3,REACH SVHC,ASTM-F963 standard.G666 animal glue is used for sticking the headband and the gauze of the hardcover book. G666 Animal Glue for Gauze and Headband