BELL JAR, PYREX, 12-1/2D X 18H FOR SAFETY REASONS, A BELL JAR GUARD SHOULD BE PURCHASED AND USED WIT

Features

• Made from Pyrex^® to withstand thermal shock and chemical attack
• Bottom of bell jar (and both ends of cylindrical) chambers are ground flat to accept an L-gasket for sealing to our baseplates, feedthrough collars, or service wells
• Inexpensive and transparent
• Good high-vacuum (HV) properties

Inspection and Use

• When receiving a glass chamber, immediately look for shipping damage
• Ignore small surface scratches and bubbles because they naturally occur during manufacturing and will not affect vacuum applications
• Look for cracks, which suggest shipping damage, particularly those causing a distinct dark line more than an inch long in the bulk of the glass
• During use, examine the glass chamber regularly for clouding, cracks, star formations (caused by point impact) or deep, long scratches
• Clean the external surface using commercial glass cleaners. If the process clouds the internal surfaces, seek advice on the best method to remove the deposit. But remember, if you are depositing some “inert” or hardcoating material on a substrate, it will form an inert, hard layer on the glass. Do not compromise the vacuum by using cleaners that cannot wash away with water or clean solvent

Important Notes

• Although carefully controlled during manufacture to ensure a minimum wall of 3/16" and checked under vacuum, glass chambers are individually blown into molds. No two are exactly alike.
• Glass chambers are fragile. To protect personnel and the chamber, surround the glass chamber with a metal guard before applying a vacuum
• Never allow hydrogen fluoride (HF—gas or aqueous solution) near the glass chamber. It attacks glass, causing it to become opaque.
• Never use harsh abrasives, wire brushes, files, or metal scrapers on the glass surface.
• If the glass chamber becomes cracked or starred, discard it immediately.