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Glass is a product of fusion that has cooled to a rigid condition without crystallizing and therefore has no melting point as such. Kimax Brand KG-33 glass is a borosilicate glass with a low coefficient of expansion and a very high resistance to chemical attack. It meets the requirements for Type I Class A glass of ASTM E438, "Glasses in Laboratory Apparatus". The alkali content is low and it is made without the calcium, magnesium and zinc groups of heavy metals. The combined total of arsenic and antimony oxides is less than 0.005%.
| Working Point1: | 1255 °C. |
| Softening Point2: | 827 °C. |
| Annealing Point3: | 565 °C. |
| Strain Point4: | 513 °C. |
| Expansion Coefficient5: | 32 x 10-7 cm/cm/ °C. |
Notes:
- The temperature at which glass has a viscosity of 104 poises. At this temperature glass is soft enough for most lampworking or sealing operations.
- The temperature at which glass has a viscosity of 107.6 poises. At this temperature glass will deform noticeably under its own weight.
- The temperature at which the internal stress caused by rapid cooling may be substantially removed within minutes.
- The temperature at which the internal strain in a glass is substantially relieved only after a matter of hours and not at a commercially desirable rate.
- The average increase in length of annealed glass per unit length per °C change in temperature over the range of 0-300 °C.
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