Tables 864-865 



TABLE 864.— Properties of Phenol-Resinoid Products 



655 



Quality 



Molding qualities 



After molding 



Machining 



Cold flow 



Transparency 



Refractive index 



Specific gravity 



Tensile strength lb. /in. 2 . 



Fig. 8 test piece 



Elongation 



Modulus of elasticity. . . 



transverse lbs. /in. 2 

 Modulus of rupture 



transverse lbs. /in. 2 



Electrical resist, wcm 3 . . . 

 Breakdown volts,* V/mil 

 3 ower factor io 6 cycles. . 

 rhermal conductivity. . . . 

 cal./sec. cm° C 



5p. heat 



3urning 



Pure 

 hardened 

 resinoid 



good 

 none 



transparent 

 translucent 

 r. 56-1. 70 

 1. 2-1.3 

 5,000 to 



1 1 ,000 

 negligible 

 10-25 



X io 5 

 12,000 to 



20,000 



io 10 to IO 12 



Molded 



Wood floor 



filler 



excellent 



Fabric 

 filler 



good 



Asbestos 

 filler 



fair 



permanently infusible 



250-700 

 4-5 to 7 

 3-4 



X io- 4 

 .33-36 



extremely low 



fair 

 none 



1. 3-1 .4 



6,000 to 



12.000 



10,000 to 



20,OCO 



IO 10 tO IO 1 



300-500 



4-5 to 8 



4-6 

 X io 4 



fair 



none 



opaque 



opaque 



1 .3-14 



6,000 to 



12,000 



negligible 



fair 

 none 



1.8-2.0 



3,500 to 



5,000 



Laminated 



Paper 



Fabric 



8,000 to 

 15,000 



IO 10 to IO 1 

 20-500 



4-5 to 7 



4-6 

 X io 4 



.30-40 



nonflamable 



8,000 to 

 20,000 



io 8 to io 9 



150-400! 



5 to 20 



12-20 



X io- 4 



sheets, tubes, 



rods, etc. 

 permanently 



infusible 



fair fair 



none none 



opaque 



opaque 



1. 3-1. 4 

 8,000 to 

 20,000 



negligible 



1.3-1.4 



8,000 to 

 12,000 



flat or edge-wise 

 75,000 



to 30,000 



IO 10 tO IO 11 



500-1300 

 4-5 to 6 



5-8 

 X io- 4 



to 25,000 



io 9 to IO 10 



200-500 



4-5 to 7 



5-8 

 X io- 4 



.30-40 

 extremely low 



Instantaneous at 60 cycles, t Mica filler. 



.nimal, vegetable, mineral oils, hydrocarbons, esters, ketones, no effect; alcohols, practically none; 

 k alkalies, slowly softened, strong, disintegrates; decomposed by strong nitric and sulphuric acids 

 by hydrochloric and hydrofluoric which attack fillers. Withstands 250 F. (Data from Mory and 

 'lor, Bakelite Corporation, 1920.) 



TABLE 865.— High Vacuum Technique 

 eferences: Dunoyer, Vacuum practice, London, Bell and Sons, 1926; Newman, The production 



measurement of low pressures, New York, Van Nostrand, 1925; Kaye, High vacuum, Longmans, 

 zn & Co., 1927; Dushman, High vacuum, Gen. Elec. Rev., 1922; Goetz, Physik und Technik der 

 hvakuums, Vierveg und Sohn, Akt. Ges., Braunschweig, 1926; Langmuir, Phys. Rev., 2, 450, 1930; 

 s. Zeitschr., 15, 516, 1914. 



he following is taken from Dushman, Rev. Mod. Phys., 2, 381, 1930, whence the above references, 

 stop-cocks, greased joints, etc., should be avoided in connection with the exhaust and preparation 

 lbes containing cathodes for which electron emissivity are to be determined. While the evaporation 

 / with the bulb immersed in liquid air was used by Langmuir, other "getters" have come into use. 



Ca, Ba, and alloys of rare-earth metals have been used. Ba cleans up practically all residual gases 

 rdinary temperatures, while Mg is ineffective for H 2 and Ca does not take up N to any great extent, 

 ■emely low pressures may be obtained with a side tube containing charcoal (which has been well 

 lusted) immersed in liquid air. Care should be taken that the liquid air is maintained at constant 

 I during the series of measurements. 



rHSONiAN Tables 



