What information do you need to engineer a custom quartz tube or component?

Please send outer and inner diameter (or wall thickness), length, required tolerances, end configuration (open, closed, flanged, ground joint or welded fittings), material grade (transparent or opaque fused quartz), working temperature and atmosphere, annual or batch quantity, and a drawing in PDF, DWG or STEP format. Complete data lets our engineers confirm manufacturability and lead time in a single review.

What is the maximum operating temperature of fused quartz?

Transparent fused quartz typically supports continuous service around 1,100 °C and short exposures up to roughly 1,250 °C, with a softening point near 1,683 °C. Real limits depend on grade, load, atmosphere and cycle time. Above about 1,100 °C, surface contamination such as alkali residue from skin contact accelerates devitrification, so quartzware should be cleaned and handled with clean gloves before firing.

How does Southeast Quartz verify quality before shipment?

Products undergo helium mass-spectrometry leak detection, pressure resistance testing and purity testing before leaving the factory, together with dimensional inspection against the customer drawing, to ensure stable performance with no impurities and no leakage.

Can you manufacture oversized quartz tubes and non-standard quartz shapes?

Yes. Our workshop combines flame hot-working with CNC cold machining, so we produce oversized fused quartz tubes, bell jars, slotted quartz boats, flanged reactors, irregular shaped quartz sheets and fully customized quartz instruments according to customer equipment parameters.

Where is Southeast Quartz located and which markets do you export to?

Our factory is at No. 1 Qingsheng Rd., Qinghu Industrial Park, Donghai County, Jiangsu, China, within China's best-known crystal and quartz industrial cluster. Besides customers throughout China, we export to Europe, the Americas, Southeast Asia and the Middle East.

High-Quality Customized Quartz Products Factories, Factory

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High-Quality Customized Quartz Products Factories, Factory

Quartz instruments are made of high-purity quartz material and include a variety of products such as quartz tubes, quartz boats, quartz crucibles, quartz reactors, quartz spiral tubes, and quartz reaction vessels. They have the characteristics of high temperature resistance, corrosion resistance, excellent light transmittance, and strong chemical stability. They are widely used in semiconductor, photovoltaic, chemical, scientific research and other fields. They are core instruments in high-temperature processing, precision synthesis, optical experiments and other scenarios to ensure process accuracy and stable equipment operation.

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Product Description

Product Specification

Operating Temp Up to 1300°C

Mohs Hardness 5.5 ~ 6.5

Density 2.2 g/cm³

Refractive Index 1.4585

Chemical Composition

Grade	Ai	Ca	Mg	Cr	Cu	Fe	Ni	Mn	Li	Na	K	Ti	B
FD-5	14	0.5	<0.1	<0.03	<0.03	0.3	<0.03	<0.2	0.4	0.8	0.6	1.2	<0.1

Physical Properties & Mechanical Behavior

Mechanical Behavior & Specification	Standard Values
Density	2.2 g/cm³
Compressive Strength	1100 Mpa
Flexural Strength	67 Mpa
Poisson's Ratio	0.14 ~ 0.17
Young's Modulus	72000 Mpa
Modulus of Rigidity	31000 Mpa
Mohs Hardness	5.5 ~ 6.5
Transformation Point	1280°C
Softening Point	1780°C
Annealing Point	1250°C
Specific Heat (20 ~ 350 °C)	670 J/kg · °C
Thermal Conductivity (20 °C)	1.4 W/m · °C
Index of Refraction	1.4585
Low Thermal Expansion Coefficient	5.5 × 10⁻⁷ cm/cm · °C
Thermal Processing Temperature	1750 ~ 2050°C
Short-term Use Temperature	1300°C
Long-term Use Temperature	1100°C
Material	Silicon Dioxide (Natural Quartz)
Color	Transparent or Colorless
Surface Quality	No air bubble, no line
Strain Point	1270°C Fused The Quartz Glass Brick
PPM Grade	Controlled 10 / 20 / 100 PPM
Shape	Circle
Thickness Range	2mm - 20mm

Frequently Asked Questions (FAQ)

What temperature limits can this quartz glass withstand?

This quartz glass has a softening point of 1780°C and a transformation point of 1280°C. It supports short-term use up to 1300°C and stable continuous long-term operation at temperatures up to 1100°C.

What are the mechanical strength specifications of this material?

The material offers exceptional mechanical integrity, featuring a compressive strength of 1100 MPa, a flexural strength of 67 MPa, a Young's modulus of 72,000 MPa, and a Mohs hardness rating between 5.5 and 6.5.

What is the purity level of Grade FD-5 quartz glass?

Grade FD-5 is manufactured from high-purity natural quartz (Silicon Dioxide) with tightly controlled PPM levels (10/20/100 PPM). Trace impurities are strictly minimized, such as Fe at 0.3, Ti at 1.2, and Ca at 0.5.

What are the optical and thermal expansion properties?

It features an index of refraction of 1.4585 and an extremely low thermal expansion coefficient of 5.5 × 10⁻⁷ cm/cm·°C, ensuring outstanding optical clarity and resistance to severe thermal shock.

What shapes, thicknesses, and surface finishes are available?

The product is offered in circular configurations with thicknesses ranging from 2mm to 20mm. It features a transparent, colorless finish guaranteed to be free of air bubbles and lines.

What is the thermal processing temperature range for fabrication?

For shaping, welding, or further manufacturing, the recommended thermal processing temperature range is between 1750°C and 2050°C, with an annealing point at 1250°C.

High-Quality Customized Quartz Products Factories, Factory

Product Description

Product Specification

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