S.C. Code Ann. § 12-36-140
(C) "Storage" and "use" do not include the keeping, retaining, or exercising of any right or power over tangible personal property:
(2) for the purpose of first being manufactured, processed, or compounded into other tangible personal property to be transported and used solely outside the State.
[Effective June 1, 2001, subsection (C) reads as follows:]
(C) "Storage" and "use" do not include the keeping, retaining, or exercising of any right or power over tangible personal property: