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 Oversized Fused Quartz Tubes from China Factory - High Temp Applications, Ideal for Suppliers in Photovoltaics and Semiconductors Manufacturers, Products

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High-Quality Oversized Fused Quartz Tubes from China Factory - High Temp Applications, Ideal for Suppliers in Photovoltaics and Semiconductors Manufacturers, Products

Large-diameter quartz tubes, produced by leading suppliers in China, are crafted from high-purity quartz materials, with diameters ranging from several centimeters to a maximum of one meter. These exceptional tubes are designed to withstand high temperatures and resist corrosion, all while offering excellent light transmittance. Their unique properties make them ideal for application in large high-temperature furnaces. As essential components in large-scale heat treatment equipment, these quartz tubes play a crucial role in various industries, including photovoltaics, semiconductors, and metallurgy. Partner with a reputable factory in China to access top-quality large-diameter quartz tubes for your industrial needs

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Product Description

Product Specifications

⭕ Outer Diameter (mm)	📐 OD Tolerance (mm)	📏 Std. Wall Thickness (mm)	🔧 Wall Thickness Tolerance (mm)	📦 Standard Length (mm)
200	±2.0～±3.0	6～12	±0.8～±1.2	1000～2000
250	±2.5～±3.5	8～14	±1.0～±1.5	1000～2000
300	±3.0～±4.0	8～16	±1.0～±1.5	1000～2000
350	±3.5～±4.5	10～18	±1.2～±1.8	1000～2000
400	±4.0～±5.0	10～20	±1.2～±2.0	1000～2000
450	±4.5～±5.5	12～22	±1.5～±2.0	1000～2000
500	±5.0～±6.0	12～25	±1.5～±2.5	1000～2000
600	±6.0～±8.0	15～28	±2.0～±3.0	1000～2000
700	±7.0～±9.0	18～32	±2.0～±3.0	1000～1800
800	±8.0～±10.0	20～35	±2.5～±3.5	1000～1800
900	±10.0～±12.0	22～40	±3.0～±4.0	1000～1500
1000	±12.0～±15.0	25～45	±3.0～±5.0	1000～1500

❓ Frequently Asked Questions

💬 What does the outer diameter (OD) range in this table cover?

The table covers outer diameters from 200 mm up to 1000 mm, providing dimensional specifications and tolerances for each standard size to suit a wide range of industrial applications.

💬 Why does the outer diameter tolerance increase as the pipe size gets larger?

Larger diameter pipes naturally require wider manufacturing tolerances due to the increased material volume, thermal expansion effects during production, and the physical limitations of forming processes. This is standard practice in pipe manufacturing and is reflected in international standards.

💬 What is the standard length available for pipes with an OD of 700 mm and above?

For pipes with an outer diameter of 700 mm and 800 mm, the standard length range is 1000 mm to 1800 mm. For larger sizes of 900 mm and 1000 mm, the standard length is reduced to 1000 mm to 1500 mm to ensure structural integrity and ease of handling.

💬 Can custom wall thicknesses be ordered outside the listed standard range?

Yes, custom wall thickness specifications can typically be accommodated upon request. The table shows the standard wall thickness range for each OD size, but specific project requirements may call for non-standard dimensions, which can be discussed with our engineering team.

💬 How is wall thickness tolerance determined for each pipe size?

Wall thickness tolerance is determined based on the pipe's outer diameter and the corresponding wall thickness range. As the pipe size and wall thickness increase, the allowable tolerance range also widens to account for the greater variability inherent in manufacturing thicker-walled sections.

💬 Are these specifications compliant with international pipe manufacturing standards?

The dimensional tolerances and standard lengths listed in this table are designed to align with widely recognized international manufacturing standards. For specific compliance requirements such as ASTM, EN, or ISO standards, please contact us directly with your project specifications for confirmation.

High-Quality Oversized Fused Quartz Tubes from China Factory - High Temp Applications, Ideal for Suppliers in Photovoltaics and Semiconductors Manufacturers, Products

Product Description

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