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.

Custom China Suppliers of Oversized Fused Quartz Tubes for High Temp Applications | Factory Direct High-Purity Solutions Supplier, Product

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Custom China Suppliers of Oversized Fused Quartz Tubes for High Temp Applications | Factory Direct High-Purity Solutions Supplier, Product

Large-diameter quartz tubes, crafted from high-purity quartz material, are available from leading suppliers and factories in China. With diameters ranging from several centimeters to a maximum of one meter, these tubes are engineered for high temperature resistance, corrosion resistance, and exceptional light transmittance. Ideal for use in large high-temperature furnaces, they play a crucial role in large-scale production across various industries, including photovoltaics, semiconductors, and metallurgy. As essential components of large-scale heat treatment equipment, these quartz tubes represent the quality and innovation of Chinese manufacturing in the global market

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Product Description

Product Specifications

Outer Diameter	Outer Diameter Tolerance	Standard Wall Thickness	Wall Thickness Tolerance	Standard Length
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

All dimensions are in millimeters (mm). Tolerances may vary based on material grade and specific manufacturing requirements. Please contact us for custom specifications.

Frequently Asked Questions

Q What outer diameter sizes are available in your standard specification range?

A Our standard outer diameter range covers sizes from 200 mm up to 1000 mm. Each size comes with defined tolerance ranges and corresponding wall thickness options to suit different engineering and construction requirements.

Q How are the outer diameter tolerances determined for each size?

A Outer diameter tolerances increase proportionally with the pipe size. For example, a 200 mm diameter pipe has a tolerance of ±2.0～±3.0 mm, while a 1000 mm diameter pipe allows ±12.0～±15.0 mm. This accounts for the greater dimensional variability inherent in larger diameter manufacturing processes.

Q What is the standard wall thickness range for large-diameter pipes (700 mm and above)?

A For large-diameter pipes of 700 mm, the wall thickness ranges from 18 to 32 mm. For 800 mm it is 20–35 mm, for 900 mm it is 22–40 mm, and for 1000 mm the range is 25–45 mm. Thicker walls are required to maintain structural integrity under higher load conditions.

Q Why does the standard length decrease for larger diameter pipes?

A Larger diameter pipes are heavier and more difficult to transport and handle. As a result, pipes with an outer diameter of 700–800 mm have a standard length of 1000–1800 mm, and pipes of 900–1000 mm are limited to 1000–1500 mm. Shorter lengths help ensure safer logistics, installation, and structural performance.

Q Can custom outer diameters or wall thicknesses be produced outside the listed specifications?

A Yes, custom specifications beyond the standard table are available upon request. Our manufacturing team can work with project engineers to develop tailored dimensions, tolerances, and lengths that meet specific application needs. Please reach out to our technical team for a custom quotation.

Q What standards or quality controls are applied to ensure tolerances are met during production?

A All products are manufactured and inspected in accorce with internationally recognized standards. Dimensional checks including outer diameter measurement and wall thickness verification are performed at multiple stages of production using precision instruments to ensure every piece falls within the specified tolerance range before delivery.

Custom China Suppliers of Oversized Fused Quartz Tubes for High Temp Applications | Factory Direct High-Purity Solutions Supplier, Product

Product Description

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