Bell Jar Open Type

Bell jars are a small-sized laboratory apparatus for creating low-quality vacuums. The chambers serve to exhibit individual items, as dust covers, or in combination with other equipment. The conventional shape features a round top and an open bottom. They are manufactured in an array of dimensions and materials.
Bell jars consist of amber-transparent cylindrical polyetherimide. The implement is placed open side down on a neoprene gasket on a base plate with a flange. The plate includes tubing adapters for connections to a vacuum pump. The specimen is placed centrally on the base and circular ridges reduce shifting and deformation. Vacuum grease may be used to improve the seal between the bell jar and base. Negative pressure adheres the bell jar to the base. A lift-ring or handle eases bell jar manipulation.