Vycor

Vycor is a Corning brand for a family of high-silica, high-temperature glasses. Finished Vycor typically contains approximately 96% silica and 4% boron trioxide, giving it a combination of properties that distinguishes it from both ordinary glass and pure fused silica. It can be formed into useful shapes through conventional glassworking methods before being converted into a silica-rich material, allowing manufacturers to make geometries that would be more difficult or expensive to produce directly from fused silica. The material is manufactured through a phase-separation and leaching process. An alkali-borosilicate precursor is first melted and shaped. Heat treatment causes the glass to separate into interpenetrating phases: one phase is rich in alkali and boric oxide and is soluble in acid, while the other is predominantly silica and remains resistant to the leaching solution. A hot-acid treatment removes the soluble phase, leaving a porous silica-rich structure. Subsequent heating above approximately 1,200 °C consolidates the porous network, producing a dense, non-porous reconstructed glass. The consolidation step also causes modest dimensional shrinkage. The resulting material has very low thermal expansion—about one quarter that of Pyrex according to the referenced description—and correspondingly strong resistance to thermal shock. These characteristics make Vycor useful where a component must tolerate rapid temperature changes, retain dimensional stability, or operate at elevated temperatures. Corning manufactures Vycor products for high-temperature applications including laboratory evaporating dishes and other scientific and engineering components. Vycor also exists in porous forms when consolidation is intentionally omitted. Porous Vycor has a strong affinity for water and can function as a getter for water vapor. Its controlled pore structure has made it a model material for research into liquids confined in porous media and for other experimental studies. Additional applications arise from its optical and chemical properties: the glass transmits ultraviolet light to roughly 250 nanometers and, at a reference thickness of 1 millimeter, has approximately 90% transmission across a broad region from about 300 to 3,100 nanometers. This supports specialized optical uses, including some germicidal-lamp and filter applications. Chemical treatment of porous Vycor before consolidation can introduce colorants or other modifiers that remain stable at high temperatures, enabling colored glass filters for specialized applications. The material has also been discussed in nuclear-chemistry and fuel-recycling contexts, including the removal of protactinium isotopes. Vycor's customer base is therefore concentrated in laboratories, instrumentation, optics, high-temperature processing, materials research, and other technical fields rather than consumer markets. Publicly available reference material does not establish a separate corporate entity, independent headquarters, founder, or standalone financial reporting for the brand; Vycor is presented as a Corning product line.

Vycor developed from the use of phase-separated borosilicate glass to create a silica-rich material with properties approaching those of fused silica while retaining greater forming flexibility. The basic concept relies on producing an alkali-borosilicate glass, thermally separating it into two chemically different interwoven phases, and selectively removing the soluble phase with hot acid. The remaining porous silica skeleton can either be used in that form or heated to collapse and consolidate its pores. This manufacturing route is significant because pure fused silica has excellent thermal and optical performance but is comparatively demanding to shape. Vycor's precursor can be formed using more conventional glassworking techniques before the leaching and consolidation stages. The process therefore provides a route to shaped, high-silica components with strong resistance to thermal shock and a very low coefficient of thermal expansion. The dense form is generally associated with high-temperature laboratory and engineering applications. Its silica-rich composition permits service at high temperatures, with the referenced material noting prolonged use around 900 °C. Its low expansion supports applications requiring dimensional stability, including metrology instruments and components exposed to severe temperature changes. Its transmission into the ultraviolet and across much of the visible and infrared spectrum has also supported specialized optical applications. A distinct branch of Vycor's history concerns the porous intermediate material. If the final consolidation stage is omitted, the result is a porous glass with a high affinity for water vapor. This property has led to use as a moisture getter and to extensive scientific study of liquids confined within controlled pores. Porous Vycor has also served as a matrix for introducing chemical species before consolidation, allowing the production of colored or otherwise modified glasses that retain useful performance at high temperatures. The material has been used and studied in laboratory science, optics, high-temperature processing, nuclear-chemistry research, and instrumentation. Corning remains the manufacturer identified with Vycor in the supplied reference material. The available sources do not provide a confirmed launch year, founder, standalone corporate history, or a detailed chronology of commercial product introductions. Vycor is best understood as a long-standing Corning technical-materials brand rather than as an independent company.

• Development of phase-separated high-silica glass

  [1]Vycoren.wikipedia.org

  A borosilicate phase-separation, acid-leaching, and heat-consolidation process established the material platform later marketed as Vycor.

• Adoption in laboratory and engineering applications

  [1]Vycoren.wikipedia.org

  Vycor became associated with high-temperature laboratoryware, optical components, metrology, and other applications requiring low expansion and thermal-shock resistance.

• Use of porous Vycor in research

  [1]Vycoren.wikipedia.org

  Porous forms were used as water-vapor getters and as a model porous matrix for studies of confined liquids.

A specialized technical-glass brand positioned around thermal-shock resistance, very low thermal expansion, high-temperature capability, broad optical transmission, and the ability to be produced in porous or dense forms.

• High-silica technical glass

  Dense Vycor glass

  A consolidated reconstructed glass containing approximately 96% silica and 4% boron trioxide. Dense Vycor combines high-temperature capability, strong thermal-shock resistance, very low thermal expansion, and useful transmission from the ultraviolet into the infrared. It is used for laboratoryware, instrumentation, optical components, and engineered parts where dimensional stability and resistance to rapid temperature changes are important.

• Porous glass

  Porous Vycor

  The porous intermediate produced after acid leaching but before final heat consolidation. Its interconnected pore structure and strong affinity for water vapor make it useful as a moisture getter and as a research matrix for studying confined liquids and transport in porous materials. The porous material can also be impregnated with selected chemical solutions before consolidation to create modified or colored glass.

• Laboratory glassware

  Vycor laboratory evaporating dishes

  High-temperature laboratory vessels manufactured from Vycor glass. Their value comes from the material's resistance to thermal shock, low expansion, and ability to tolerate elevated-temperature laboratory operations. They are intended for scientific and industrial laboratories rather than general consumer use.

• Optical glass

  Vycor optical components and filters

  Specialized windows, filters, and related components that use Vycor's broad optical transmission and thermal performance. The material transmits ultraviolet light to approximately 250 nanometers and has roughly 90% transmission over a broad range beginning near 300 nanometers and extending to about 3,100 nanometers at a 1-millimeter reference thickness. Modified colored forms can be used in high-temperature filtering applications.

1. 1Vycoren.wikipedia.org
2. 2Porous and Reconstructed Glassesosti.gov
3. 3Chemical Separation Processes for Uranium and Plutoniumosti.gov