THERMAL STUDIES ON ASBESTOS: III. EFFECT OF HEAT ON THE BREAKING STRENGTH OF ASBESTOS CLOTH CONTAINING COTTON

1941 ◽  
Vol 19b (3) ◽  
pp. 65-67
Author(s):  
D. Wolochow
Keyword(s):  
Breaking Strength ◽  
Thermal Studies

Commercial, Underwriters', and A grades of asbestos cloth begin to lose strength as soon as heat is applied. On heating for five minutes at 300 °C. these three grades of asbestos cloth lose approximately 60, 35, and 25% of their original (conditioned) breaking strength, respectively. Charts are given showing the effect of heating, at temperatures up to 600 °C., for periods up to one hour.

THERMAL STUDIES ON ASBESTOS: II. EFFECT OF HEAT ON THE BREAKING STRENGTH OF ASBESTOS TAPE AND GLASS FIBRE TAPE

1941 ◽  
Vol 19b (2) ◽  
pp. 56-60
Author(s):  
D. Wolochow
Keyword(s):  
Glass Fibre ◽  
Breaking Strength ◽  
Thermal Studies ◽  
Chrysotile Asbestos ◽  
Rapid Loss ◽  
Prolonged Heating ◽  
Adsorbed Moisture

The first result of heating pure chrysotile asbestos tape, crocidolite (blue) asbestos tape, and glass fibre tape to drive off the adsorbed moisture is an increase in breaking strength.Pure chrysotile tape does not lose strength till a temperature of 370 °C. is exceeded. Prolonged heating at 430 °C. causes a loss in strength of about 20%, at 480 °C. of about 40%. Heating at 540 °C. causes a rapid loss in strength.Crocidolite asbestos tape loses strength more rapidly than chrysotile asbestos tape.Glass fibre tape, though initially stronger than chrysotile tape, is considerably less resistant to heat, beginning to lose strength rapidly at about 250 °C., whereas chrysotile asbestos tape does not suffer any appreciable decrease in strength till a temperature of 400 °C. is exceeded.

Synthesis, Characterization and Thermal studies of Novel Organomercury Driven from Sulfa Drugs Part 1

2011 ◽  
Vol 7 (2) ◽  
pp. 1338-1347
Author(s):  
Tarek Ali Fahad ◽  
Shaker.A.N. AL-Jadaan
Keyword(s):  
Thermal Decomposition ◽  
Thermal Behavior ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Thermal Studies ◽  
Spectroscopic Techniques ◽  
Sulfa Drugs ◽  
Acid Base ◽  
Ph Values ◽  
Multi Stage

Two new heterocyclic Organmercury compounds   were prepared from the reaction of Sulfamethaxazole and Sulfadiazine with 4-acetaminophenol as a coupler and separated as solids with characteristic colors. these compounds were characterized by F.T.IR-spectroscopy 1H-NMR , Micro-elemental Analysis and UV-Vis spectroscopic techniques . The work involves a study of acid – base properties compounds at different pH values, the ionization and protonation constants were calculated. The thermal behavior of these two compounds   were investigated on the basis of thermogravimetric (TGA) and differential thermogravimetric (DTG) analyses, Thermal decomposition of these compounds is multi-stage processes.

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