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 Oversized High-Temperature Fused Quartz Tube Suppliers in China - Quality Factory Manufacturing Solutions Factories, Products

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Custom Oversized High-Temperature Fused Quartz Tube Suppliers in China - Quality Factory Manufacturing Solutions Factories, Products

Large-diameter quartz tubes, manufactured by leading suppliers in China, are crafted from high-purity quartz material. These tubes can reach impressive diameters of up to one meter, making them ideal for a variety of industrial applications. Renowned for their high temperature resistance, corrosion resistance, and excellent light transmittance, these quartz tubes are essential for large high-temperature furnaces. They play a crucial role in large-scale production processes across industries such as photovoltaics, semiconductors, and metallurgy. As a key component of large-scale heat treatment equipment, our factory ensures that these quartz tubes meet the highest quality standards to support your production needs

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Product Description

Product Specifications

⌀ Outer Diameter (mm)	📐 OD Tolerance (mm)	📏 Standard 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

* All dimensions in millimeters (mm)

❓ Frequently Asked Questions

Q What outer diameter range is available for these pipes?

The available outer diameter range spans from 200 mm to 1000 mm, covering a wide variety of industrial, structural, and infrastructure applications.

Q What are the standard wall thickness options for a 500 mm outer diameter pipe?

For a pipe with a 500 mm outer diameter, the standard wall thickness ranges from 12 mm to 25 mm, with a wall thickness tolerance of ±1.5 mm to ±2.5 mm.

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

For pipes with an outer diameter of 700 mm to 800 mm, the standard length is 1000 mm to 1800 mm. For pipes with an outer diameter of 900 mm to 1000 mm, the standard length is reduced to 1000 mm to 1500 mm.

Q How does the outer diameter tolerance change as the pipe size increases?

The outer diameter tolerance increases proportionally with the pipe size. For example, a 200 mm pipe has a tolerance of ±2.0～±3.0 mm, while a 1000 mm pipe has a significantly wider tolerance of ±12.0～±15.0 mm to accommodate manufacturing variability at larger scales.

Q Can custom wall thicknesses or lengths be ordered outside of the standard specifications?

The table reflects standard production specifications. For custom wall thicknesses, lengths, or tolerances beyond the listed ranges, please contact our technical team directly to discuss your specific project requirements.

Q What do the wall thickness tolerances indicate, and why do they matter?

Wall thickness tolerances define the acceptable deviation from the nominal wall thickness during manufacturing. They are critical for ensuring structural integrity, pressure resistance, and compatibility with fittings and joints. Tighter tolerances are typically required for high-pressure or precision engineering applications.

Custom Oversized High-Temperature Fused Quartz Tube Suppliers in China - Quality Factory Manufacturing Solutions Factories, Products

Product Description

Product Specifications

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