Listing ID #3893715
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This apparatus is used for the determination of single or mixed melting points of most organic substances in powder form. These substances , which are opaque at ambient temperature become transparent on melting. The melting point is noted on a mercury-in glass thermometer just when the substance under test starts melting. |
| The thin glass capillaries which are inserted into the three holes in the aluminum block are illuminated by an incandescent lamp and are seen magnified by the use of a built-in double convex lens. This eliminates the strain of viewing the thin glass capillaries in which the powders under test is / are placed. The rate of rise of temperature of the aluminum block is controlled by a rotary rheostat built into the apparatus. The glass capillaries are in thermal contact with the aluminum block and therefore heat transfer is efficient. When the substance starts melting, the temperature as indicated by the inserted thermometer is noted , which is the melting point temperature of the particular substance. |
| A boost heater to heat the block rapidly is also provided. Put of booster heater when temperature will reach 25ºc to 30ºc below the required temperature (i.e. Rough melting point of the substance) . Slow heating will help to give accurate melting point. As an optional accessory , a cooling plug to bring down the temperature can be supplied, which is to be inserted in the hole where thermometer bulb was kept . Cooling takes place by circulation of water in the cooling plug which has an inlet outlet. |
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