Aijiren 18mm crimp top headspace vials with flat bottom for . Shimadzu now offer a complete range of Headspace Vial Kits for GC in both Crimp and Screw Top configurations. All vials are Type 1 borosilicate glass and the range is extensive enough to cover all major manufacturer’s instruments, including Shimadzu, Aijiren, PE, CTC and Tekmar