Rigid Anaerobic units can be manufacture from economical Polymer or the sturdy Aluminum.
The Aluminum units are ideal for labs with chemical resistance needs, due to the ability to upgrade the standard polycarbonate viewing screen to a Tempered Glass, and the Glove Port Panel to an Aluminum style. Aluminum Anaerobic Chambers also have the advantage to upgrade to a gloveless style.
The Polymer units are an easy and economical way to get started with an Anaerobic Chamber. Equiped with a purge only airlock these units are typically half the cost of the other style Anaerobic Chambers. It is important to keep in mind that while less exspensive to purchase it may cost more to operate due to the purge only application of the airlock, but in a low volume lab this may be just the unit for you.