Flame polishing

A short stem, flame-polished funnel of diameter ca. 12.5 cm, free of any scratches or broken edges, was used to prevent spontaneous decomposition of diazomethane. 

Use a pipet puller to prepare glass transfer pipets so that they are 2-3 cm long with a 120-180 pm diameter, and flame polish the end. Fill the pipet with a small amount of light paraffin oil, then an air bubble, then M2, followed by another air bubble. Fill the pipet with 5-7 eggs, followed by another air bubble and a small amount of M2. 

Special arrangements must be made if the liquid is to be transferred and kept under vacuum. One of the easiest and cheapest ways to obtain the Raman spectrum of a liquid under vacuum is to distill the liquid into a small glass tube, usually about 3 mm (or less) inner diameter, whose lower end is sealed and flame-polished. The tube is placed vertically and the laser beam directed into the lower end, passing vertically through the tube. A spherical mirror is placed behind the tube to collect the maximum amount of the Raman radiation. A lens system in front focuses the total Raman radiation on the entrance slit of the monochromator. 

Flame polishing n. A method of finishing a plastic article, particularly a just formed... 

A technique similar to flame polishing can be used to treat certain plastic surfaces before coating or adhesives bonding. See flame treatment surface treatment. 

Flame Polishing n A method of finishing a plastic article, particularly a just formed extrudate, in which a carefully controlled flame or stream of hot gas is directed at the surface, melting a thin skin of resin that, when quenched, has a high gloss. 

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