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Like any material that is expected to provide a design life at high temperatures, fused quartz demands some care in handling and use to achieve maximum performance from the product.
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 General Quartz Product Information
General Questions
Technical Questions
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General Quartz Product Information
Q. How do I store fused quartz?
A. Space permitting, fused quartz should be stored in its original shipping container. If that is not practical, at least the wrapping should be retained.
Q. How do I store quartz tubing?
A. The end coverings should be kept in place until the product is used. This protects the ends from chipping and keeps out dirt and moisture which could compromise the purity and performance of the tubing.
Q. How do I clean my quartz products?
A. Momentive recommends the following procedure: The product, particularly tubing, should be washed in deionized or distilled water with a degreasing agent added to the water. The fused quartz should then be placed in a 7% (maximum) solution of ammonium bifluoride for no more than ten minutes, or a 10% vol % (maximum) solution of hydrofluoric acid for no more than five minutes. Etching of the surface will remove a small amount of fused quartz material as well as any surface contaminants. To avoid water spotting which may attract dirt and cause devitrification upon subsequent heating, the fused quartz should be rinsed several times in deionized or distilled water and dried rapidly. To further reduce the possibility of contamination, care should be used in handling fused quartz. The use of clean cotton gloves at all times is essential. Washing of translucent tubing is not recommended because the water or acid solution tends to enter the many capillaries in the material. This may cause the quartz to burst if the pieces are subsequently heated rapidly to very high temperatures.
Rate of Dissolution Chart
Q. How can I create an even layer of crisobalite on diffusion tubes in order to increase resistance to devitrification?
A. Following procedure has been used to create an even layer of cristobalite on diffusion tubes in order to increase any resistance to devitrification. Place the tube in a furnace at 1200°C, and rotate the tube 90o every two hours for the first 30 hours. If the working schedule does not permit adherence to this procedure, the following suggestion is offered. Place the tube in a furnace at 1200°C and rotate the tube 90° every two hours for the first 8 hours, then reset the furnace to operating temperature.
Q. What is and what can be done about solarization?
A. Fused quartz made from natural raw materials solarizes or discolors upon prolonged irradiation by high energy radiation (such as short UV, x-rays, gamma rays and neutrons). Resistance to this type of solarization increases with the purity of fused quartz. Hence, synthetic fused silica is highly resistant to solarization. Solarization in fused quartz can be thermally bleached by heating it to about 500°C.
Rotation Procedures For Fused Quartz Furnace Tubes
The following procedure has been used to create an even layer of cristobalite on diffusion tubes in order to increase any resistance to devitrification. Place the tube in a furnace at 1200°C, and rotate the tube 90° every two hours for the first 30 hours. If the working schedule does not permit adherence to this procedure, the following suggestion is offered. Place the tube in a furnace at 1200°C and rotate the tube 90° every two hours for the first 8 hours, then reset the furnace to operating temperature.
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General Questions
Q. Do I need a password to order quartzware products?
A. Yes, you need to contact your Customer Service Representative to identify your interest in setting up your personalized product portfolio. If you are not a registered Momentive Performance Materials customer, please click Contact Momentive Performance MaterialsWorldwide to contact one of our sales managers to discuss your needs. After setting up a portfolio you will be provided with a user name and password.
Order Products
Q. Where can I get product and pricing information?
A. We manufacture quartz and sell it to fabricators who in turn manufacture it into other forms. Attached is a link to our authorized distributors and fabricators who should be able to meet your needs.
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Technical Questions
Q. How can I get technical support?
A. An important consideration for today's users of fused quartz is the availability of technical product support. Momentive Performance Materials backs its products with fully equipped analytical and development laboritories and a staff of materials and fusion experts to support custom requirements. State-of-the-art analytical equipment assures optimal production quality and also enables certification and subsequent verification of Momentive Performance Materials product compliance with stringent industry standards. Physical properties and other information was developed from a number of sources, including Momentive Performance Materials's technical laboratories, textbooks and technical publications While Momentive Performance Materials believes that this information is accurate, it is not an exhaustive review of the subjects covered and, accordingly, Momentive Performance Materials makes no warranty as to the accuracy or completeness of the data. Customers are advised to check references to ensure that the product is suitable for the customer's particular use or requirements. Additional technical assistance from our engineering team is available by calling or faxing our world headquarters.
Q. I am interested in quartz that has low absorption in the .9 to 2 micron region.
A. The transmission calculator in the IR range should answer your questions. Please see the attached link.
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