ALKEN, Belgium (Jan. 7)—Helvoet Pharma, an international maker of rubber and aluminum closures for the pharmaceutical sector, has expanded its U.S. manufacturing by buying the Pharmatech division of Wheaton USA Inc. This move furthers Helvoet Pharma's strategy to expand its pharmaceutical packaging activities particularly in the U.S., according to a Helvoet statement. Wheaton Pharmatech employs 188 in Salisbury, Md., making rubber closures and aluminum and plastic caps for pharmaceutical packaging. Wheaton Pharmatech will be integrated into Helvoet Pharma USA. Details of the transaction were not disclosed.