Before the 1970's, the primary ingredient in our protein glues was extracted collagen from hides of bovine and porcine.
LD Davis - BLOG
How Is Animal Glue Made?
Animal glues (also known as hide glue, and protein glue) are made through prolonged boiling of pure bovine or porcine animal hides, connective tissues, and bones.
Our lab team tests gram strength on all gelatin and animal glues we receive into our manufacturing facility. We then use that number in correlation to the viscosity to determine what raw materials get used in our cake glues and dehydrated hide glue.