For your reading enjoyment.
ATF Federal Explosives Law and Regulations - 2000
18. Are binary explosives subject to regulation under Federal explosives laws?
Until the compounds are mixed, they are not classified as explosives and, therefore, are not subject to control. However, once mixed, binary explosives are considered to be explosive materials and are subject to all applicable Federal requirements. A person who regularly combines compounds of binary explosives to manufacture such explosives for the purpose of sale or distribution or for the persons own business use is a manufacturer of explosives materials and must be licensed as a manufacturer under the law. [18 U.S.C. 841(h); 27 CFR 55.11: definition of manufacturer]
36. When is a manufacturer's license required?
A manufacturers license is needed only by persons engaged in the business of manufacturing explosive materials for sale, distribution, or for business use. For example, persons engaged in the business of providing a blasting service using explosives of their own manufacture would be required to have a manufacturers license. Persons who manufacture explosives for their personal, nonbusiness use would not need a manufacturers license. [27 CFR 55.11: definition of manufacturer, 55.41]
40. Is a manufacturers license required for agricultural use of binary explosives?
No, as long as the user is not engaged in the business of manufacturing explosive materials. For example, if a farmer buys binary explosives for use in blowing tree stumps on his farm, he or she does not need a manufacturers license. However, if the farmer uses binary explosives in a business of blasting stumps/rocks, etc., for other persons, he or she would be required to have a manufacturers license. See also Questions 18, 36 and 37. [27 CFR 55.11: Definition of a manufacturer, 55.41(a)]