Glass stable

CHEMICAL PROPERTIES high chemical stability and inertness thermodynamically unstable, but kinetically stable gas inert to nucleophilic attack stable to water and to glass does not attack glass stable to silent electrical discharge unchanged at 500°C (932°F) does not exchange fluorine with hydrogen fluoride hazardous polymerization will not occur FP (NA) LFL/UFL (NA) AT (NA) HF (-1220.5 kJ/mol gas at 25°C). 

For solids which melt above 100° and are stable at this temperature, drying may be carried out in a steam oven. The crystals from the Buchner funnel should then be placed on a clock glass or in an open dish. The substance may sometimes be dried in the Buchner funnel itself by utilising the device illustrated in Fig. 77, <33, 1. An ordinary Pyrex funnel is inverted over the Buchner funnel and the neck of the funnel heated by means of a broad flame (alternatively, the funnel may be heated by a closely-fltting electric heating mantle) if gentle suction is applied to the Alter flask, hot (or warm) air will pass over the crystalline solid. 

The salts rapidly hydroly2e to form NF and O2, and react with glass at temperatures above 85°C to form NF and SiF (21). The NF" 4 salts are stable in dry atmospheres to 200°C, but rapidly decompose above 300°C to yield NF, F2, and the corresponding Lewis acid. Therefore, these salts are solid sources of NF and F2, free of atmospheric contaminants and HF. 

The synthesis of the high molecular weight polymer from chlorotrifluoroethylene [79-38-9] has been carried out in bulk (2 >—21 solution (28—30), suspension (31—36), and emulsion (37—41) polymerisation systems using free-radical initiators, uv, and gamma radiation. Emulsion and suspension polymers are more thermally stable than bulk-produced polymers. Polymerisations can be carried out in glass or stainless steel agitated reactors under conditions (pressure 0.34—1.03 MPa (50—150 psi) and temperature 21—53°C) that require no unique equipment. 

Modem analytical techniques have not only aided glass producers, but also enabled suppUers of raw materials to produce a more consistent product. Closer monitoring of purity and on-site blending of raw materials are now used by many producers. A stable and uniform raw material is the key to the manufacture of high quaUty glass. 

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