Cryogenic Liquids and Freezing Equipment: Liquefied nitrogen and carbon dioxide are commonly used in a wide range of freezing and chilling applications.
Freezing with Cryogenic Liquids
Liquid nitrogen (or other cryogens or liquid carbon dioxide) freezing has many advantages over mechanical freezing and chilling processes:
- More flexible
- Takes up less space
- Lower maintenance
Cryogenic freezing also helps minimize dehydration of the frozen items, while retaining item quality, texture, color, and, in the case of food items, flavor.
View our tabular comparison of cryogenic freezing vs mechanical freezing:
Lab and Medical Scale Freezing
Cryogens are often used for preservation of biological tissue samples, blood samples, and related lab applications.
Medical offices will use liquid nitrogen in dermatological treatments and procedures.
Cryogens can be supplied in small or large dewars suitable to the rate of usage by the application. MATHESON representatives can help with recommendations regarding vessel size.
In addition to recommending cryogen storage vessel capacity, MATHESON can also support the selection of the freezer type.
Food Freezing is the most common application for cryogenic freezing, with nitrogen and carbon dioxide being the two materials most often used. MATHESON provides liquid nitrogen and liquid carbon dioxide, as well as a comprehensive array of freezers, accessory products, and associated services.
For a summary of our products and services for food freezing, please see our Food Freezing page.
Refer to the data sheet below for the differences between liquid nitrogen and carbon dioxide.
Small scale freezers for use with liquid nitrogen are described in the data sheets below. For larger scale freezers, see our Food Freezing page.
* Technically Speaking ...
While liquefied gases can be extremely cold, not all are, technically, cryogenic liquids. Depending on whose standard nomenclature is used, a cryogenic liquid is generally one with a normal boiling point colder than –150°C. The NIST defines a cryogenics as occurring at temperatures below –180°C.
Cryogenic liquids include nitrogen, oxygen, hydrogen, argon, helium, and neon. Using strict definitions, carbon dioxide and nitrous oxide are excluded, but for practical applications considerations, on these pages, we group them all together.