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	Fused quartz tubes
		Type 600 is Black-red Fused Quartz tube that is a doped fused quartz material.
		It is compare with clean Fused Quartz, which absorbs essentially all UV and most visible radiation while maintaining transmittance efficiency in the infra-red spectrum range, and change UV and visible radiation for red radiation.
		It is compare with milk fused quartz while have good transmittance efficiency in the infra-red spectrum range; in unit area can load a number of times energy.
	www.quartz-jd.cn.net /a01.htm (358 words)

	Method to produce fused quartz particulates - Patent 5928397
		A method to produce fused quartz particulates from quartz sand is disclosed employing continuous withdrawal of the molten material from a furnace apparatus.
		Melting of quartz sand in such manner permits numerous bubbles and other physical discontinuities, such as striae, ridges, grain structures and the like to form in the fused quartz ribbon 22 being continuously removed from the furnace apparatus 12 thereby enhancing its subsequent thermal fracture according to the present method.
		Said heated fused quartz ribbon 22 is next continuously immersed in a container of cooling water 30 causing immediate thermal-shock sufficient to shatter said member into a plurality of relatively small pieces 32.
	www.freepatentsonline.com /5928397.html (2080 words)

	Method of enhancing fused quartz body purity - Patent 5096479
		A fused quartz tube 10 of outside diameter 25 mm and inside diameter 19 mm was mounted between the chucks 11, 12 of a glass-working lathe.
		Mobile metallic impurity ions were thus caused to diffuse through the fused quartz to the outer surface wall of the tube, where the hot gases stimulated vaporization of the impurity ions, at the zone of impingement of the flame with the external surface of the tube.
		A hollow cylindrical ingot 20 of fused quartz having a wall thickness of 45 mm was lowered through a high temperature graphite furnace 21, as conventionally used for redrawing an annular ingot to tubing, operating at a temperature of 2100.degree.
	www.freepatentsonline.com /5096479.html (2549 words)

	Wale - Glassworking and Laboratory Products - Catalog Detail
		In general, the electrical insulating properties of clear fused quartz are superior to those of the opaque or translucent types.
		In general, the devitrification rate of fused quartz is slow for two reasons: the nucleation of the cristobalite phase is possible only at the free surface, and the growth rate of the crystalline phase is low.
		In one study using GE 214LD fused quartz tubing, it was found that the sag rate decreases as the wall thickness of the tube is increased.
	www.waleapparatus.com /details/CFQ1.asp (2194 words)

	Fused Quartz Encyclopedia Information @ ArtQuilt.com (Art Quilt) (Site not responding. Last check: )
		Fused quartz and fused silica are types of glass containing primarily silica in amorphous (non-crystalline) form.
		Fused silica is produced using high purity silica sand as the feedstock, and is normally melted using an electric furnace, resulting in a material that is translucent or opaque.
		Synthetic fused silica is made from a silicon-rich chemical precursor usually using a continuous flame hydrolysis process which involves chemical gasification of silicon, oxidation of this gas to silicon dioxide, and thermal fusion of the resulting dust (although there are alternative processes).
	www.artquilt.com /encyclopedia/Fused_quartz (1192 words)

	Fused quartz (Site not responding. Last check: )
		Quartz 1.4 Quartz 1.4.5 released (Mon, 14 Mar 2005 00:54:09 GMT)
		Quartz 1.4 Quartz 1.4.1 released (Thu, 24 Jun 2004 06:00:00 GMT)
		Quartz 1.4 Quartz 1.4.0 released (Thu, 10 Jun 2004 06:00:00 GMT)
	www.serebella.com /encyclopedia/article-Fused_quartz_.html (463 words)

	Fused silica and fused quartz substrates and wafers
		Optically polished, to Angstrom level, Fused Silica, Fused Quartz, and single Crystal Quartz windows, MEMS and SOI wafers, substrates, plates and ultra-thin fused silica windows can be delivered in one to two weeks and rush orders even sooner.
		Most optical materials, including fused silica and fused quartz substrates and wafers can be processed in sizes as large as 12" square or 12" diameter.
		Custom fused silica windows in any size, shape, thickness or surface finish are available on special orders.
	www.quartz-silica.net (311 words)

	Fused quartz and fused silica windows
		Fused silica and fused quartz wafers and substrates
		Optically polished fused silica, fused quartz and single crystal quartz
		Fused silica and fused quartz substrates, windows and plates
	www.valleydesign.com /fsqp.html (84 words)

	quartz tube - Products for quartz tube - Manufacturers, Exporters, Suppliers, Traders, Companies, Factories
		We have the pleasure of introducing ourselves to you as a big company specializing in the manufacture...
		This page is your quartz tube one-stop source for the competitive price and quality.
		Global quartz tube buyers find suppliers here every day.
	www.ec21.com /ec-market/quartz_tube.html (440 words)

	Momentive Performance Materials Properties
		Useful charts to determine the mechanical properties of fused quartz.
		Use the charts in this section to determine the thermal properties of the fused block quartz for your application.
		These properties make quartz ideally suited for applications where high purity is required or the use temperature is high.
	www.gequartz.com /en/properties.htm (198 words)

	Optical Windows .co.uk \| Fused Quartz Plates 'substrates'
		Fused quartz plates and substrates are fabricated from raw quartz glass materials either from cored rods, ingots, sheets or blocks.
		Fused Quartz plates and substrates can be processed to ultra thin thickness’ and is custom processed to many forms, see custom processing.
		Fused quartz substrates are widely used in the laboratory for experiments and take the form of microscope slides and cover slips, plates, discs and substrates.
	www.opticalwindows.co.uk /fusedquartz-plates.html (191 words)

	Fused quartz in TutorGig Encyclopedia (Site not responding. Last check: )
		Fused quartz is made by melting high purity naturally occurring quartz crystal at around 2000°C using either an electrically heated furnace (electrically fused) or a gas/oxygen fuelled furnace (flame fused).
		Synthetic fused silica is made from a silica-rich chemical precursor usually using a continuous flame hydrolysis process which involves chemical gassification of silicon, oxidation of this gas to silicon dioxide, and thermal fusion of the resulting dust (although there are alternative processes).
		Flame fused material always has a higher water content due to the combination of the hydrocarbons and oxygen fuelling the furnace forming hydroxyl OH within the material.
	www.tutorgig.com /ed/fused_quartz (773 words)

	Melles Griot Optics Guide - Synthetic Fused Silica (Site not responding. Last check: )
		Synthetic fused silica (amorphous silicon dioxide) is formed by chemical combination of silicon and oxygen.
		It is not to be confused with fused quartz, which is made by crushing and melting natural crystals, or by fusing silica sand, which results in a granular microstructure and bubble entrapment.
		Infrared batch-to-batch transmittance variations in synthetic fused silica are attributable to fluctuations in the OH chemical bond content.
	www.mellesgriot.com /products/optics/mp_3_2.htm (955 words)

	Technical Information: Quartz Scientific, Inc.
		Fused quartz and silica are attacked by phosphoric acid at temperatures in the range of 150 degrees C or higher, and by hydrofluoric acid at all temperatures.
		Fused quartz and silica have an extremely low coefficient of thermal expansion which imparts a high resistance to thermal shock.
		Quartz resistivity (10 to 17th power) ohms/cc at 25 degrees C is in the order of (10 to 17th power) ohms/cc at 1000 degrees C. Fused Quartz Typical Trace Element Composition (ppm by weight)
	www.qsiquartz.com /techinfo.htm (310 words)

	Definition of Fused quartz
		Fused quartz is a man-made material manufactured principally from sands.
		The chemical name of fused quartz is silicon dioxide, which is also called silica.
		Fused silica is transparent to ultraviolet light and near infrared light, and has many uses in technical optics as a consequence.
	www.wordiq.com /definition/Fused_quartz (358 words)

	GFI Scientific glass blowing products and services
		Details for the principles of Annealing Quartz are covered in the Annealing of Fused Quartz PDF to the right.
		Fused quartz is a solid material at room temperature, but at high temperatures, it behaves like all glasses.
		The softening point of fused quartz has been variously reported from 1500°C to 1670 °C, the range resulting from differing conditions of measurement.
	www.finkenbeiner.com /THERMALPROP.htm (942 words)

	Quality Quartz of America, Inc - Clear-Strates (Site not responding. Last check: )
		Because of the exceptional grade of quartz used and our unique manufacturing processes, we feel that these fiber support products are truly of superior quality to other substrates on the market.
		Quality Quartz uses special, high grade QQ 319 fused quartz, which offers impressive, inherent qualities such as durability, dimensional stability and structural integrity.
		QQ 319 fused quartz requires proper handling and storage in order for the material to maintain its innate qualities.
	www.qualityquartz.com /qqaclear.htm (560 words)

	GFI Scientific glass blowing products and services
		One potential contaminant is sodium, which occurs naturally in the silica sand used to make fused quartz.
		One reason that GE fused quartz tubing can withstand the wide thermal gradients and chemical environments of wafer processing operations is its (OH-) content of less than 10 ppm water in most grades.
		GE Quartz backs its products with fully equipped analytical and development lab oratories and a staff of materials and fusion experts available to support customer requirements.
	www.finkenbeiner.com /generalpropqtz.htm (1788 words)

	Optical, mechanical and thermal properties of sapphire, glass, fused quartz, fused silica, borosilicate and soda lime.
		Fused quartz glass vs. crystalline quartz is a good example of the same type of atoms (SiO2) structured in such a way that one orientation forms a glass and another forms a crystal.
		Fused quartz and fused silica are the amorphous form of quartz.
		Fused silica is a purer version of fused quartz that is made from various silicon gasses.
	www.rayotek.com /techincal_info_glass_sapphire.htm (1502 words)

	Translume Inc - Fused Silica (Site not responding. Last check: )
		Vitreous silica is an old term used to describe all types of bulk (by opposition to thin-film) silica glass with producers referring to the material as either fused quartz or as fused silica.
		Today Fused Quartz is defined as a material made by melting high purity naturally occurring quartz crystal at around 2000°C using either an electrically heated furnace (electrically fused) or a gas/oxygen fuelled furnace (flame fused).
		Synthetic Fused Silica (commonly called ‘Fused Silica') is made from a silica-rich, chemical precursor, resulting in a transparent amorphous solid with an ultra-high purity and excellent optical transmission in the deep ultraviolet and visible.
	www.translume.com /m_overview.htm (374 words)

	Fabricated Quartzware
		Fused quartz products were those produced from quartz crystal to make transparent ware, and fused silica described products manufactured from sand into opaque ware.
		When silicon dioxide is synthetically derived, however, the material is referred to as synthetic fused silica.
		Fused quartz can be used in many demanding environments, from high-pressure to high-vacuum, from high-temperature to very cold temperatures.
	www.ferrotec.com /technology/fabricatedQuartz.php (298 words)

	Materials — Fused Silica (SiO2) Properties
		Fused silica is a noncrystalline (glass) form of silicon dioxide (quartz, sand).
		Optical and general purpose fused silica rods and tubing are drawn from a melt made from high purity chemicals.
		The glass may be clear or translucent, in which case it is often referred to as fused quartz.
	www.accuratus.com /fused.html (288 words)

	Fused Quartz Used for SPI Supplies® Brand Quartz Slides and Cover Slips - Fused Quartz vs. Fused Silica
		This is what is called "fused quartz" and is also the kind of quartz used for the fabrication of the SPI Supplies quartz slides and cover slips.
		In this case, the starting material is a synthetic quartz (as opposed to natural quartz) that is produced by way of reaction of silicon tetrachloride.
		When used to produce quartz slides, because the amount of raw material being purchased is much lower, the final differential between a slide in fused silica vs. fused quartz could be a factor of ten.
	www.2spi.com /catalog/ltmic/fused-quartz-silica.html (512 words)

	Fused quartz (Site not responding. Last check: )
		Synthetic fused silica is made from a silica-rich chemical precursor, resulting in a transparent glass with an ultra-high purity and improved optical transmission in the deep ultraviolet.
		Translucent fused silica is used to make crucibles, trays and other containers for use in high temperature thermal processing, which are chemically inert to to most elements and compounds including virtually all acids, regardless of concentration.
		Quartz microbalance/heat conduction calorimeter, gas sorption, calorimetry, thermal analysis, pharmaceutical excipients, proteins, polymers, catalysts and quartz microbalance.
	www.omniknow.com /common/wiki.php?in=en&term=Quartz_glass (1801 words)

	Polymicro Technologies > Catalog > Quartz and Synthetic Fused Silica
		Names like quartz, silica, fused silica, fused quartz, synthetic quartz, synthetic fused silica or synthetic fused quartz have been used in various publications, sometimes to describe the same product.
		Typically produced from the melting (fusing) of crystalline quartz and refined such that an amorphous (glass) is formed.
		Synthetic Fused Silica is amorphous silicon dioxide that has been produced through chemical deposition rather than refinement of natural ore. This synthetic material is of much higher purity and quality as compared to fused quartz made from natural minerals.
	www.polymicro.com /catalog/1_3.htm (402 words)

	Quartz Microscope Slides and Quartz Cover Slips
		Generally speaking, quartz slides and cover slips are recommended for most applications involving chemical microscopy, in order to be sure that nothing is "lost" due to absorption in a glass slide.
		This question often times arises and the SPI quartz slides and cover slips are made to a typical flatness of 2-4 "bands" per in.
		The quartz offered by SPI Supplies is considered to be the premier quality of quartz and the full transmittance data is provided to our customers.
	www.2spi.com /catalog/ltmic/quartz.shtml (1276 words)

	Re: the difference between crystal and fused quartz
		SiO2, in all its forms (quartz and clear fused silica being two of several) is made up of little tetrahedra consisting of a silicon atom surrounded by 4 oxygen atoms in a tetrahedral arrangement.
		In pure SiO2, each oxygen is shared between two tetrahedra...that is, the tetrahedra are essentially joined together at their tips (it is possible to come up with arrangements where the tetrahedra share two oxygens or three oxygens, but only if other atoms are present).
		Quartz has a moderately complicated but regular and repeating pattern of tetrahedra.
	www.madsci.org /posts/archives/jul99/932271784.Ch.r.html (277 words)

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