EMS introduces a full line of Borosilicate Glass Culture Tubes. These tubes reduce changes in pH and potential contaminants from tubes that are made from soda lime glass. They have round bottoms and feature fire-polished smooth rims. Chemically inert, suitable for use in blood banks and tissue culture. Made in an ISO 9001:2008 certified factory, they are packaged well in heavy duty boxes and shrink-wrapped to stay particle free. The boxes will fit neatly into most test tube dispensers. The tubes are available in 8 sizes.