439 



TABLE 454.— DIELECTRIC CONSTANT AND LOSS TANGENT OF DIELECTRIC 



MATERIALS (continued) 



Part 2. — Liquids 



Temp. Frequency, cycles per second 



Materials °C , A •, 



A Inorganic 1 * 1Qti 1 X 106 3 * 108 3xl0» lxlO 10 



Water, conductivity" 1.5 e'/eo 87.0 87.0 86.5 80.5 38 



tan 5 1,900 190 320 3,100 10,300 



25 e'/eo 78.2 78.2 77.5 76.7 55 



tanS 4,000 400 160 1,570 5,400 



45 e'Ao 71.5 71.0 70.7 59 



tan 5 590 105 1,060 4,000 



65 e'/eo 64.8 64.5 64.0 59 



tanS 865 84 765 3,200 



85 e'/eo 58 58 57 56.5 54 



tan 5 12,400 1.240 73 547 2,600 



B. Organic 



1. Aliphatic 1 X 102 ^io 3 1X10« ixio" 



Methyl alcohol 42 25 e'/eo 31 31 8.9 



tan 5 2,000 380 8,100 



Ethyl alcohol 48 25 e'/e„ 24.5 23.7 1.7 



tan 5 900 620 680 



n-Propyl alcohol 44 25 e'/e„ 20.1 19.0 2.3 



tan 5 180 2000 900 



Carbon tetrachloride 45 25 e'/e 2.17 2.17 2.17 2.17 2.17 



tan 5 60 8 <.4 <2 16 

 2. Aromatic 



Nitrobenzene 45 25 e'/eo 36 



tan 5 80 



Styrene N-100 48 22 e'/eo 2.40 2.40 2.40 2.36 



tan 5 38 5 <3 58 



3. Insulating oils 



Bayol 47 24 e'/e„ 2.14 2.14 2.14 



tan 5 12.6 2 18 



Fractol 48 26 e'/e 2.17 2.17 2.16 



tan5 <1 <1 11.3 



Marcol 48 24 e'/eo 2.14 2.14 2.14 2.14 



tan 5 1 <1 <2 11.2 



Primol-D 50 24 e'/e„ 2.17 2.17 2.17 2.16 



tan 5 <1 <1 <2 10.6 



Cable oil 5314" 25 e'/eo 2.25 2.25 2.22 



tan 5 3 <A 22 

 80 e'/eo 2.18 2.18 



tan 5 38 4 



Pyranol 1467 52 25 e'/e 4.40 4.40 4.40 4.04 2.65 



tan 5 36 3 190 1300 750 



Halowax oil 1000 53 25 e'/eo 4.80 4.77 4.77 2.99 



tan 5 490 50 <2 1850 



4. Lubricants 



Vaseline 25 e'/e, 2.16 2.16 2.16 2.16 2.16 



tan 5 3 2 <1 <4 10 



Silicone fluid No. 500, 54 22 e'/eo 2.76 2.76 2.72 



100 cs. at 25°C tan 5 .4 <.4 240 



Silicone fluid No. 200, 54 23 e'/eo 2.76 2.76 2.70 



100 cs. at 25°C tan 5 .8 .4 320 



Notes: 1, From conductivity waler. 2, Fresh crystals (Harshaw). Audio frequency loss decreases with 



time. For a discussion of low-frequency dispersion in ionic crystals see R. G. Breckenridge, Bull. Amer. Phys. 



Soc, vol. 23, p. 33, 1948. 3, Magnesium silicate (American Lava). 4, Muscovite. 5, Mica, glass, Ti0 2 

 (Mycalex). 6, Knox. 7, 96% Si0 2 . 8. Iron sealing glass. 9, Soda-lime (Pittsburgh-Corning). 



10, Si0 2 (General Electric). 11, Eastman Kodak; recryst. and resubl. Lab. Ins. Res. 12, Mica-filled 



(Bakelite). 13, 50% paper laminate (Formica). 14, 58% mica, 2% misc. (Monsanto). 15, 55% filler 

 (Formica). 16, Mineral filler (American Cyanamid). 17, a-cellulose (Libbey-O wens-Ford). 18, 



DuPont. 19, 5-15% plasticizer, pigments, dyes (Tennessee Eastman). 20, 25% camphor (DuPont). 21, 

 2.73 ethoxy groups/glucose, plast. (Dow). 2, Cross-linked organo siloxane polymer (Dow Corning). 23. 



(continued) 



SMITHSONIAN PHYSICAL TABLES 



