{"id":16444,"date":"2026-06-15T09:11:49","date_gmt":"2026-06-15T09:11:49","guid":{"rendered":"https:\/\/www.quartz-grinding.com\/?p=16444"},"modified":"2026-06-15T09:11:52","modified_gmt":"2026-06-15T09:11:52","slug":"ordinary-glass-vs-quartz-glass-a-technical-comparison-for-high-purity-quartz-processing","status":"publish","type":"post","link":"https:\/\/www.quartz-grinding.com\/fr\/ordinary-glass-vs-quartz-glass-a-technical-comparison-for-high-purity-quartz-processing\/","title":{"rendered":"Verre ordinaire vs verre de quartz\u00a0: une comparaison technique pour le traitement du quartz de haute puret\u00e9"},"content":{"rendered":"

If you work with specialty glass, semiconductors, optical components, or high\u2011temperature industrial equipment, you\u2019ve likely encountered this question: Why is quartz glass so much more expensive than ordinary glass when both look transparent and similar?<\/em><\/p>\n\n\n\n

The answer lies not in appearance but in material properties. Thermal behavior, spectral transmission, thermal expansion, and purity are all very important. For buyers of powder processing equipment, understanding these differences is also critical, because the quality of high\u2011purity quartz powder<\/strong> directly determines the performance of the final quartz glass product.<\/p>\n\n\n\n

Let\u2019s break down the key distinctions from an engineering perspective, and then look at how the right milling and classifying equipment helps you achieve the purity and particle size consistency that high\u2011end applications demand.<\/p>\n\n\n\n

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Ordinary glass vs Quartz glass<\/figcaption><\/figure>\n\n\n\n

1. Thermal Resistance and Thermal Shock<\/h3>\n\n\n\n

Ordinary soda\u2011lime glass has a maximum service temperature of around 600\u202f\u00b0C, but its real weakness is poor thermal shock resistance. A rapid temperature change \u2014 for example, pouring boiling water into a thick glass \u2014 creates internal stress that often leads to immediate fracture.<\/p>\n\n\n\n

Quartz glass (fused silica) behaves very differently. It can operate continuously at 1100\u202f\u00b0C and withstand brief excursions to even higher temperatures. Its low coefficient of thermal expansion (approximately 5.5\u202f\u00d7\u202f10\u207b\u2077\u202f\/\u202fK, about 1\/20th that of ordinary glass) allows it to survive sudden temperature swings, such as moving directly from a flame into cold water. This is why quartz glass is the only choice for high\u2011temperature furnace windows, UV disinfection lamp envelopes, and laboratory ware that undergoes repeated heating and cooling cycles.<\/p>\n\n\n\n

2. Optical Transmission: UV and Short\u2011Wavelength Performance<\/h3>\n\n\n\n

To the unaided eye, both glasses appear clear. However, when you measure transmittance in the ultraviolet and deep\u2011UV range, the difference is dramatic. Ordinary glass blocks most UV\u2011B and UV\u2011C wavelengths due to iron impurities and other additives. That\u2019s why standard window glass does not darken in sunlight \u2014 it simply does not transmit the activating UV.<\/p>\n\n\n\n

Quartz glass, particularly when made from high\u2011purity raw materials, transmits from the deep UV (down to about 160\u202fnm) through the visible and into the infrared. This broad spectral transmission is essential for applications such as UV curing, laser optics, semiconductor lithography, and medical aesthetic devices. If ordinary glass were used in these systems, the light would be absorbed, rendering the equipment ineffective.<\/p>\n\n\n\n

3. Coefficient of Thermal Expansion (CTE)<\/h3>\n\n\n\n

The CTE of ordinary glass is roughly 9\u202f\u00d7\u202f10\u207b\u2076\u202f\/\u202fK. While manageable for uniform heating, it becomes problematic in applications with temperature gradients or cyclic thermal loads. Uneven expansion creates stress, and over time or under sudden change, the material cracks.<\/p>\n\n\n\n

Quartz glass has an exceptionally low CTE, about 0.55\u202f\u00d7\u202f10\u207b\u2076\u202f\/\u202fK from room temperature to 1000\u202f\u00b0C. This means it barely expands when heated and does not contract appreciably upon cooling. The practical result: components made from quartz glass maintain dimensional stability, resist thermal fatigue, and can be used in applications where ordinary glass would fail within minutes, such as high\u2011power industrial lamps, continuous\u2011operation furnace viewports, and precision optical benches.<\/p>\n\n\n\n

4. Purity and Impurity Control<\/h3>\n\n\n\n

The raw materials for ordinary glass include silica sand, soda ash, and limestone, which contain significant levels of iron, aluminum, calcium, and other elements. These impurities are acceptable for windows and bottles, but they are detrimental in electronics, optics, and high\u2011temperature applications.<\/p>\n\n\n\n

Quartz glass is produced from high\u2011purity quartz<\/strong> (often 99.995% SiO\u2082 or higher). The raw material goes through beneficiation, melting, and precision forming. Low impurity levels mean fewer bubble inclusions, better UV transmission, higher chemical resistance, and consistent dielectric properties. This purity is what qualifies quartz glass for semiconductors, fiber optics, laser cavities, and precision research instruments. In short, ordinary glass is a commodity; quartz glass is an engineered material.<\/p>\n\n\n\n

5. Why the Price Difference Is So Large<\/h3>\n\n\n\n

The cost gap is often a factor of 10 to 50\u00d7. It comes from several factors:<\/p>\n\n\n\n