40ml Purge and Trap Vials from Aijiren. Aijiren flat bottomed EPA vials are available in 40 sizes, suitable for water or soil samples. They are made of (offered in) chemically inert Type I borosilicate glass, in either clear or amber for light sensitive samples. The 40 mL vials are offered in clear (Type 1, 33 expansion) and amber Type 1, 51