aijiren Tech™ National™ and aijiren Tech™ Chromacol™ Sample Storage Screw Thread Vials are manufactured from superior quality 33 expansion borosilicate clear (Type 1, Class A) or 51A amber (Type 1, Class B) glass. Storage vials range from 2mL to 40mL. PTFE-lined solid-top storage caps. PTFE on film/foam backing offers broad