Sigma Scientific Glass Pvt. Ltd manufactures Chuck & Seal. Sigma Scientific Glass Pvt. Ltd is an ISO 9001:2000 certified company. Chuck & Seal are used in chemical, pharmaceutical, dyes and allied industries. They consist of chuck, bellow seal or mechanical seal, glass seal plate or ceramic seal plate, clamping plate, flexible shaft, stud, etc. This assembly prohibits contact of process fluids with anything other then agitator or seal components. The Chuck & Seal can be used for vacuum up to 10 mm Hg. The mechanical seal can be used for vacuum up to 1 mm Hg and for higher then atmospheric pressure up to the permissible operating limits of the glass vessels.