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.

Wholesale China Suppliers of Oversized Fused Quartz Tubes for High-Temperature Applications - Factory Direct Supplier, Suppliers

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Wholesale China Suppliers of Oversized Fused Quartz Tubes for High-Temperature Applications - Factory Direct Supplier, Suppliers

Our large-diameter quartz tubes, manufactured at our factory in China, are crafted from high-purity quartz material, achieving impressive diameters of up to one meter. Renowned for their exceptional temperature and corrosion resistance, these quartz tubes offer superior light transmittance, making them ideal for high-temperature furnaces. They play a crucial role in large-scale production processes across diverse industries, including photovoltaics, semiconductors, and metallurgy. As trusted suppliers, we provide essential components for large-scale heat treatment equipment, ensuring reliability and performance in demanding applications.

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Product Specifications

📐 All dimensions are in millimeters (mm). Tolerances listed are standard ranges and may vary based on material grade and production method.

Outer Diameter (mm)	Outer Diameter 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

❓ Frequently Asked Questions

Q What does the outer diameter tolerance mean in this specification table?

A The outer diameter tolerance indicates the allowable deviation from the nominal outer diameter during manufacturing. For example, a pipe with an outer diameter of 200mm and a tolerance of ±2.0～±3.0mm means the actual diameter may range from 197mm to 203mm, depending on the specific tolerance applied.

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

A Larger diameter pipes (700mm and above) are heavier and more difficult to handle, transport, and install. Reducing the standard length helps manage weight, minimize structural stress during transit, and ensure safer on-site handling. Pipes with OD ≥ 900mm are limited to 1000～1500mm lengths for this reason.

Q Can wall thickness be customized outside the listed standard range?

A Yes, custom wall thicknesses beyond the listed standard range are typically available upon request. Custom specifications may be required for high-pressure applications, extreme temperature environments, or specific structural requirements. Please consult with the manufacturer for custom orders.

Q How do I select the correct wall thickness for my application?

A Wall thickness selection depends on several factors including operating pressure, fluid type, temperature, and applicable industry standards. Thicker walls provide greater strength and pressure resistance. It is recommended to consult engineering guidelines or a qualified engineer to determine the appropriate wall thickness for your specific use case.

Q What standards are these pipe dimensions based on?

A These pipe dimensions and tolerances are generally aligned with common international manufacturing standards such as ISO, ASTM, or DIN, depending on the material and application. The specific standard applicable to your order should be confirmed with the supplier at the time of purchase.

Q Are tolerances the same across all pipe sizes in the table?

A No, tolerances increase proportionally with pipe size. Larger diameter pipes have wider tolerance ranges for both outer diameter and wall thickness. This is standard practice in pipe manufacturing, as maintaining tight tolerances becomes more challenging at larger scales. Always refer to the specific row in the table for accurate tolerance data for your required size.

Wholesale China Suppliers of Oversized Fused Quartz Tubes for High-Temperature Applications - Factory Direct Supplier, Suppliers

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