Anhydrous milk fat is the product obtained from prime quality raw materials (milk, cream or butter) to which raw materials no neutralizing substances have been added. Anhydrous milk fat products are manufactured in three common and distinct varieties:

1. Anhydrous Milk Fat: Must contain at least 99.8 percent milk fat and be made from fresh cream or butter; no additives (for neutralization of free fatty acids) are permitted.

2. Anhydrous Butteroil: Must contain at least 99.8 percent milk fat but can be made from cream or butter of different ages; use of alkali (an additive) to neutralize free fatty acids is permitted.

3. Butteroil: Must contain at least 99.3 percent milk fat; raw material and processing specifications are the same as for Anhydrous Butteroil.