To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

Soda–lime glass

From Wikipedia, the free encyclopedia

Reusable soda–lime glass milk bottles
Reusable soda–lime glass milk bottles
Old window made from soda-lime flat glass, Jena, Germany: The distorted reflections of a tree indicate that the flat glass was possibly not made by the float glass process.
Old window made from soda-lime flat glass, Jena, Germany: The distorted reflections of a tree indicate that the flat glass was possibly not made by the float glass process.

Soda–lime glass, also called soda–lime–silica glass, is the most prevalent type of glass, used for windowpanes and glass containers (bottles and jars) for beverages, food, and some commodity items. Some glass bakeware is made of soda-lime glass, as opposed to the more common borosilicate glass.[1] Soda–lime glass accounts for about 90% of manufactured glass.[2][3]

Soda–lime glass is relatively inexpensive, chemically stable, reasonably hard, and extremely workable. Because it can be resoftened and remelted numerous times, it is ideal for glass recycling.[4] It is used in preference to chemically-pure silica, which is silicon dioxide (SiO2), otherwise known as fused quartz. Whereas pure silica has excellent resistance to thermal shock, being able to survive immersion in water while red hot, its high melting temperature (1723 °C) and viscosity make it difficult to work with.[5] Other substances are therefore added to simplify processing. One is the "soda", or sodium carbonate (Na2CO3), which lowers the glass-transition temperature. However, the soda makes the glass water-soluble, which is usually undesirable. To provide for better chemical durability, the "lime" is also added. This is calcium oxide (CaO), generally obtained from limestone. In addition, magnesium oxide (MgO) and alumina, which is aluminium oxide (Al2O3), contribute to the durability. The resulting glass contains about 70 to 74% silica by weight.

The manufacturing process for soda–lime glass consists in melting the raw materials, which are the silica, soda, lime (in the form of (Ca(OH)2), dolomite (CaMg(CO3)2, which provides the magnesium oxide), and aluminium oxide; along with small quantities of fining agents (e.g., sodium sulfate (Na2SO4), sodium chloride (NaCl), etc.) in a glass furnace at temperatures locally up to 1675 °C.[6] The temperature is only limited by the quality of the furnace structure material and by the glass composition. Relatively inexpensive minerals such as trona, sand, and feldspar are usually used instead of pure chemicals. Green and brown bottles are obtained from raw materials containing iron oxide. The mix of raw materials is termed batch.

Soda–lime glass is divided technically into glass used for windows, called flat glass, and glass for containers, called container glass. The two types differ in the application, production method (float process for windows, blowing and pressing for containers), and chemical composition. Flat glass has a higher magnesium oxide and sodium oxide content than container glass, and a lower silica, calcium oxide, and aluminium oxide content.[7] From the lower content of highly water-soluble ions (sodium and magnesium) in container glass comes its slightly higher chemical durability against water, which is required especially for storage of beverages and food.

YouTube Encyclopedic

  • 1/5
    503 345
    410 476
    1 970
    2 237
    15 634
  • Prince Rupert's Drops: 400 Year Old Mystery Revealed
  • Purifying Glass Ingredients For How To Make Everything & King of Random
  • Forensics Glass Analysis


Typical compositions and properties

Typical transmission spectrum of a 2 mm glass[8]
Typical transmission spectrum of a 2 mm glass[8]

Soda–lime glass undergoes a steady increase in viscosity with decreasing temperature, permitting operations of steadily increasing precision. The glass is readily formable into objects when it has a viscosity of 104 poises, typically reached at a temperature around 900 °C. The glass is softened and undergoes steady deformation when viscosity is less than 108 poises, near 700 °C. Though apparently hardened, soda–lime glass can nonetheless be annealed to remove internal stresses with about 15 minutes at 1014 poises, near 500 °C. The relationship between viscosity and temperature is largely logarithmic, with an Arrhenius equation strongly dependent on the composition of the glass, but the activation energy increases at higher temperatures.[9]

The following table lists some physical properties of soda–lime glasses. Unless otherwise stated, the glass compositions and many experimentally determined properties are taken from one large study.[7] Those values marked in italic font have been interpolated from similar glass compositions (see calculation of glass properties) due to the lack of experimental data.

Properties Container glass Flat glass
74 SiO2 0.3 K2O
13 Na2O 0.2 MgO
10.5 CaO 0.04 Fe2O3
1.3 Al2O3 0.01 TiO2
0.2 SO3
73 SiO2 0.03 K2O
14 Na2O 4 MgO
9 CaO 0.1 Fe2O3
0.15 Al2O3 0.02 TiO2
log(η, dPa·s or poise)
= A + B / (T in °C − T0)
550 °C (1,022 °F) 1,450 °C (2,640 °F)
B 3922
T0 291
550 °C (1,022 °F) 1,450 °C (2,640 °F)
A −2.585
B 4215
T0 263
Glass transition
temperature, Tg
573 °C (1,063 °F) 564 °C (1,047 °F)
Coefficient of
thermal expansion,
ppm/K, ~100–300 °C (212–572 °F)
9 9.5
at 20 °C (68 °F), g/cm3
2.52 2.53
Refractive index
nD at 20 °C (68 °F)
1.518 1.520
Dispersion at 20 °C (68 °F),
104 × (nFnC)
86.7 87.7
Young's modulus
at 20 °C (68 °F), GPa
72 74
Shear modulus
at 20 °C (68 °F), GPa
29.8 29.8
1,040 °C (1,900 °F) 1,000 °C (1,830 °F)
capacity at 20 °C (68 °F),
49 48
Surface tension,
at ~1,300 °C (2,370 °F), mJ/m2
Chemical durability,
Hydrolytic class,
after ISO 719[10]
3 3...4
Critical stress
intensity factor,[11]
(KIC), MPa.m0.5
? 0.75

See also


  1. ^ Estes, Adam Clark (March 16, 2019). "The Pyrex Glass Controversy That Just Won't Die". Gizmodo. Retrieved 2019-03-22.
  2. ^ "Borosilicate Glass vs. Soda Lime Glass? - Rayotek News". Archived from the original on 23 April 2017. Retrieved 23 April 2017.
  3. ^ Robertson, Gordon L. (22 September 2005). Food Packaging: Principles and Practice (Second ed.). CRC Press. ISBN 978-0-8493-3775-8. Archived from the original on 2 December 2017.
  4. ^ "Calcium Carbonate - Glass Manufacturing". congcal. Retrieved 5 August 2013.
  5. ^ "Glass – Chemistry Encyclopedia". Archived from the original on 2 April 2015. Retrieved 1 April 2015.
  6. ^ B. H. W. S. de Jong, "Glass"; in "Ullmann's Encyclopedia of Industrial Chemistry"; 5th edition, vol. A12, VCH Publishers, Weinheim, Germany, 1989, ISBN 978-3-527-20112-9, pp. 365–432.
  7. ^ a b "High temperature glass melt property database for process modeling"; Eds.: Thomas P. Seward III and Terese Vascott; The American Ceramic Society, Westerville, Ohio, 2005, ISBN 1-57498-225-7
  8. ^ "Sodalime Optical Glass – Internal transmittance (2 mm)". Archived from the original on 2011-09-09. Retrieved 2013-08-24.
  9. ^ Thomas H. Sanders Jr. "Viscosity Behavior of Oxide Glasses". Coursera.
  10. ^ "ISO 719:1985 - Glass -- Hydrolytic resistance of glass grains at 98 degrees C -- Method of test and classification".
  11. ^ Wiederhorn, S.M. (1969). "Fracture stress energy of glass". Journal of the American Ceramic Society. 52 (2): 99–105. doi:10.1111/j.1151-2916.1969.tb13350.x.
  12. ^ Gondret, P.; M. Lance; L. Petit (2002). "Bouncing Motion of Spherical Particles in Fluids". Physics of Fluids. 14 (2): 643–652. doi:10.1063/1.1427920.
  13. ^ Janssen, L. P. B. M., Warmoeskerken, M. M. C. G., 2006. Transport phenomena data companion. Delft: VVSD.
  14. ^ "Soda-Lime (Float) Glass Material Properties ::".
This page was last edited on 18 December 2020, at 17:45
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.