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Cosa (chi) è gutta percha - definizione
LATEX DERIVED FROM THE GUTTA-PERCHA TREE (TREE OF THE GENUS PALAQUIUM IN THE FAMILY SAPOTACEAE)
Gutta percha; Guttapercha; Gutta-Percha
![Lithograph depicting the [[caning of Charles Sumner]] with a cane made of gutta-percha](https://commons.wikimedia.org/wiki/Special:FilePath/Southern Chivalry.jpg?width=200 "Lithograph depicting the [[caning of Charles Sumner]] with a cane made of gutta-percha")
![Cable manufacturing with gutta-percha at the Telegraph Construction and Maintenance Company in [[Greenwich]], London, ''circa'' 1865](https://commons.wikimedia.org/wiki/Special:FilePath/The Reels of Gutta-percha Covered Conducting Wire Conveyed into Tanks at the Works of the Telegraph Construction and Maintenance Company, at Greenwich MET DP801249.jpg?width=200 "Cable manufacturing with gutta-percha at the Telegraph Construction and Maintenance Company in [[Greenwich]], London, ''circa'' 1865")
![Kayan]] tribe in [[Borneo]] harvesting the sap of a gutta-percha tree {{circa}} 1910<!-- Published in 1912 -->](https://commons.wikimedia.org/wiki/Special:FilePath/The pagan tribes of Borneo; a description of their physical, moral and intellectual condition, with some discussion of their ethnic relations (1912) (14598075089).jpg?width=200 "Kayan]] tribe in [[Borneo]] harvesting the sap of a gutta-percha tree {{circa}} 1910<!-- Published in 1912 -->")
![Old State House]] museum, [[Boston, Massachusetts]])](https://commons.wikimedia.org/wiki/Special:FilePath/Walking cane used to assault Senator Charles Summner, May 1856 - Old State House Museum, Boston, MA - IMG 6685.JPG?width=200 "Old State House]] museum, [[Boston, Massachusetts]])")
Gutta Percha
The hardened milky juice of a tree, the Isonandra gutta, growing in
Malacca and other parts of the Eastern Archipelago. It is much used as
an insulator or constituent of insulators.
Resistance after several minutes electrification per 1 centimeter cube
at 54º C. (75º F.), 4.50E14 ohms.
The specific resistance varies--from 2.5E13 to 5.0E14 ohms. A usual
specification is 2.0E14 ohms. The influence of temperature on its
resistance is given in Clark & Bright's empirical formula, R = R0
at, in
which R is the resistance at temperature tº C--Ro the resistance
at 0º C
(32º F), a is the coefficient .8944.
The resistance increases with the time of passage of the current, the
variation being less the higher the temperature.
Time
of
Relative Resistance Relative Resistance
Electrification. at 0º C (32º F.) at 24º C (75º F.)
1 minute 100 5.51
2 " 127.9 6.
5 " 163.1 6.66
10 " 190.9 6.94
20 " 230.8 7.38
30 " 250.6 7.44
60 " 290.4 7.6
90 " 318.3 7.66 In cable testing one minute is generally taken as the time of electrification. Pressure increases the resistance by the formula Rp=R (1+ .00327 P) in which Rp is the resistance at pressure p--R resistance at atmospheric pressure--p pressure in atmospheres. Thus in the ocean at a depth of 4,000 meters (2.4855 miles), the resistance is more than doubled. The longer the pressure is applied, the greater is the resistance. The specific inductive capacity of gutta percha is 4.2. Good gutta percha should not break when struck with a hammer, should recover its shape slowly, and it should support much more than 300 times its own weight.
Electrification. at 0º C (32º F.) at 24º C (75º F.)
1 minute 100 5.51
2 " 127.9 6.
5 " 163.1 6.66
10 " 190.9 6.94
20 " 230.8 7.38
30 " 250.6 7.44
60 " 290.4 7.6
90 " 318.3 7.66 In cable testing one minute is generally taken as the time of electrification. Pressure increases the resistance by the formula Rp=R (1+ .00327 P) in which Rp is the resistance at pressure p--R resistance at atmospheric pressure--p pressure in atmospheres. Thus in the ocean at a depth of 4,000 meters (2.4855 miles), the resistance is more than doubled. The longer the pressure is applied, the greater is the resistance. The specific inductive capacity of gutta percha is 4.2. Good gutta percha should not break when struck with a hammer, should recover its shape slowly, and it should support much more than 300 times its own weight.
Gutta-percha
·noun A concrete juice produced by various trees found in the Malayan archipelago, especially by the Isonandra, / Dichopsis, Gutta. It becomes soft, and unpressible at the tamperature of boiling water, and, on cooling, retains its new shape. It dissolves in oils and ethers, but not in water. In many of its properties it resembles caoutchouc, and it is extensively used for many economical purposes. The Mimusops globosa of Guiana also yields this material.
Gutta-percha
Gutta-percha is a tree of the genus Palaquium in the family Sapotaceae. The name also refers to the rigid, naturally biologically inert, resilient, electrically nonconductive, thermoplastic latex derived from the tree, particularly from Palaquium gutta; it is a polymer of isoprene which forms a rubber-like elastomer.
Wikipedia
Gutta-percha
Gutta-percha is a tree of the genus Palaquium in the family Sapotaceae. The name also refers to the rigid, naturally biologically inert, resilient, electrically nonconductive, thermoplastic latex derived from the tree, particularly from Palaquium gutta; it is a polymer of isoprene which forms a rubber-like elastomer.
The word "gutta-percha" comes from the plant's name in Malay: getah translates as "latex". Percha or perca is an older name for Sumatra.
