{"id":94,"date":"2026-02-06T07:46:46","date_gmt":"2026-02-06T07:46:46","guid":{"rendered":"https:\/\/www.jundro.com\/?p=94"},"modified":"2026-04-08T08:33:31","modified_gmt":"2026-04-08T08:33:31","slug":"low-cte-glass-materials-guide","status":"publish","type":"post","link":"https:\/\/www.jundro.com\/de\/low-cte-glass-materials-guide\/","title":{"rendered":"Top 5 Low Thermal Expansion Glass Materials: Comparison & Selection Guide"},"content":{"rendered":"\n

Low thermal expansion glass materials are widely used in high-end industries such as optics, semiconductor equipment, and laser systems, where dimensional stability under temperature fluctuations is critical.<\/p>\n\n\n\n

Among these, five materials\u2014Zerodur, ULE, ClearCeram, Borosilicate Glass (BF33), and Fused Quartz<\/strong>\u2014are the most commonly used low-CTE materials in precision engineering and also represent the majority of our machining projects.<\/p>\n\n\n\n

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Overview of Low Expansion Materials<\/h2>\n\n\n\n

Zerodur<\/strong><\/h3>\n\n\n\n

Developed by SCHOTT, Zerodur\u00ae is a glass-ceramic material with a near-zero coefficient of thermal expansion. It is available in multiple CTE grades to meet different precision requirements.<\/p>\n\n\n\n

Typical applications:<\/strong>
Laser gyroscopes, spectrometers, and semiconductor lithography components.<\/p>\n\n\n\n

ULE (Ultra-Low Expansion Glass)<\/strong><\/h3>\n\n\n\n

Manufactured by Corning Incorporated, ULE\u00ae is often compared directly with Zerodur\u00ae due to its similarly low CTE.<\/p>\n\n\n\n

It offers excellent optical homogeneity and dimensional stability, making it highly suitable for precision optical systems.<\/p>\n\n\n\n

Typical applications:<\/strong>
Astronomical telescopes, laser resonators, and ultra-stable optical structures.<\/p>\n\n\n\n

ClearCeram<\/strong><\/h3>\n\n\n\n

ClearCeram\u00ae is a low thermal expansion glass-ceramic material developed by Ohara Corporation. Through controlled crystallization, it achieves near-zero CTE while offering improved mechanical strength and thermal shock resistance.<\/p>\n\n\n\n

Typical applications:<\/strong>
Precision optical components, metrology equipment, and semiconductor-related structures.<\/p>\n\n\n\n

Borosilicate Glass (BF33)<\/strong><\/h3>\n\n\n\n

Borosilicate Glass (BF33) is a widely used industrial glass material with a relatively low coefficient of thermal expansion, excellent chemical resistance, and high optical transmission in the visible range.<\/p>\n\n\n\n

Typical applications:<\/strong>
Semiconductor process windows, inspection ports, and laboratory equipment.<\/p>\n\n\n\n

Fused Quartz<\/strong><\/h3>\n\n\n\n

Fused Quartz is a high-purity silicon dioxide (SiO\u2082) glass known for its low thermal expansion and outstanding optical transmission from deep ultraviolet (UV) to near-infrared (NIR) wavelengths.<\/p>\n\n\n\n

Typical applications:<\/strong>
Laser systems, UV optics, photonics components, and high-performance semiconductor windows.<\/p>\n\n\n\n

CTE Comparison Table<\/h2>\n\n\n\n
Material<\/th>Typical CTE (\u03b1, \u00d710\u207b\u2076 \/K)<\/th>Thermal Stability Level<\/th><\/tr><\/thead>
Zerodur<\/td>~0 \u00b1 0.02<\/td>Ultra-low<\/td><\/tr>
ULE<\/td>~0 \u00b1 0.03<\/td>Ultra-low<\/td><\/tr>
ClearCeram<\/td>~0 \u00b1 0.1<\/td>Ultra-low<\/td><\/tr>
Borosilicate (BF33)<\/td>\u2248 3.3<\/td>Medium<\/td><\/tr>
Fused Quartz<\/td>\u2248 0.5<\/td>Very low<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Practical Material Selection Guide<\/h2>\n\n\n\n

Need ultra-high dimensional stability (nano\/sub-micron level)?<\/strong>
\u2192 ULE\u00ae or Zerodur\u00ae Need low expansion with better mechanical strength?<\/strong>
\u2192 ClearCeram\u00ae or Zerodur\u00ae Need chemical resistance with moderate thermal performance?<\/strong>
\u2192 Borosilicate Glass (BF33) Need UV transparency and high laser resistance?<\/strong>
\u2192 Fused Quartz Working with limited budget and less demanding thermal conditions?<\/strong>
\u2192 BF33 or alternative cost-effective substrates<\/p>\n\n\n\n

Precision Machining of Low Expansion Glass<\/h2>\n\n\n\n

At Jundro, we specialize in ultra-precision machining of low thermal expansion materials, enabling the fabrication of complex geometries such as curved surfaces, intricate structures, lightweight designs, and honeycomb configurations. With advanced machining capabilities, we achieve optical flatness up to \u03bb\/20, maintain tight tolerances for critical components, and offer optional optical coating services to meet demanding application requirements. If you are working in precision optics, semiconductor equipment, or laser systems, we are ready to support your material selection and machining needs with reliable, high-performance solutions.<\/p>\n\n\n\n

Quick Links<\/strong><\/h2>\n\n\n\n