330 



TABLE 331.— VISCOSITY OF GLASS 121 



(Temperature variation) 

 Part 1. 



Log™ 77 (poises) at 



Part 2. 



Composition (weight percentages) 



Part 3. — Commercial glass t 



LogioT? (poises) at 



Glass 



designation Manufacturer 



Code 0010-Potash soda lead. Corning Glass Works 

 0120-Potash soda lead. " " " 



" 1710-Hard lime 



" 7720-Borosilicate .... " " 



" 7740-Pyrex 



Plate glass Blue Ridge Glass Corp 



Window glass Libby-Owens-Ford . 



700 



800 



°C 



5.35 



5.41 



10.45 

 6.80 

 7.87 



8.35 



900 1000 1100 1200 1300 1400 



4.52 

 4.57 

 7.95 

 5.66 

 6.48 

 5.00 

 5.06 



3.86 

 3.89 

 6.28 

 4.82 

 5.52 

 4.03 

 4.14 



3.36 

 3.36 

 4.93 

 4.16 

 4.77 

 3.41 

 3.41 



2.91 

 2.91 

 3.92 

 3.65 

 4.16 

 2.87 

 2.90 



°C 

 2.53 

 2.53 

 3.22 

 3.20 

 3.67 

 2.46 

 2.48 



2.22 

 2.22 

 2.62 

 2.86 



2.07 

 2.14 



121 Babcock, C. L., Journ. Amer. Cer. Soc, vol. 17, p. 329, 1934; English Journ. Soc. Glass Techn., vol. 7, 

 p. 25, 1923; vol. 8, p. 205, 1924; vol. 9, p. 83. 1925; vol. 10, p. 52, 1926; Lillie, H. R., Tourn. Amer. Cer. Soc, 

 vol. 14. p. 502, 1931; Hunter, Journ. Amer. Cer. Soc, vol. 17, p. 121, 1934; Lillie, H. R., unpublished data. 



* R 2 O a . Glasses 11 and 12 contained 0.50 and 0.34 percent BaO, respectively. t Glass 14 contains 20 per- 



cent ItaO. t Data by H. R. Lillie, Corning Glass Works Laboratory. 



SMITHSONIAN PHYSICAL TABLES 



