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 for Oversized Fused Quartz Tubes - High Temperature Applications from Leading Factory Factories, Products

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Wholesale China Suppliers for Oversized Fused Quartz Tubes - High Temperature Applications from Leading Factory Factories, Products

High-purity quartz tubes with large diameters are expertly crafted in our China factory, reaching sizes of up to one meter. These tubes are engineered to withstand high temperatures and resist corrosion, while offering exceptional light transmittance. As leading suppliers in the industry, we provide these essential components for large-scale high-temperature furnaces, widely utilized in the fields of photovoltaics, semiconductors, and metallurgy. Our quartz tubes play a critical role in optimizing heat treatment equipment for large-scale production, ensuring efficiency and reliability for our clients

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Product Specifications

Product Details

⭕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

📌 All dimensions are in millimeters (mm)

❓ Frequently Asked Questions

Q1 What does the outer diameter tolerance mean in this specification table?

The outer diameter tolerance refers to the allowable deviation from the nominal outer diameter during manufacturing. For example, a pipe with an outer diameter of 200mm may have a tolerance of ±2.0～±3.0mm, meaning the actual diameter can range from 197mm to 203mm within acceptable quality standards.

Q2 Why does the standard length decrease for larger diameter pipes?

Larger diameter pipes (700mm and above) have a reduced standard length range (1000～1800mm or 1000～1500mm) primarily due to increased weight, handling limitations, and transportation constraints. Shorter lengths make logistics and on-site installation more manageable for heavy-duty large pipes.

Q3 Can custom wall thickness be ordered outside the standard range listed?

Yes, in most cases custom wall thickness beyond the standard range can be manufactured upon request. The table shows standard production ranges, but specific project requirements — such as higher pressure ratings or special structural needs — may call for non-standard wall thicknesses, which can typically be arranged with the manufacturer.

Q4 How does wall thickness tolerance affect the performance of the pipe?

Wall thickness tolerance directly impacts the structural integrity and pressure-bearing capacity of the pipe. A tighter tolerance ensures more consistent performance across the pipe's length, which is especially critical in high-pressure or load-bearing applications. Larger diameter pipes naturally carry wider tolerances due to manufacturing complexity.

Q5 What standards or certifications govern these dimensional tolerances?

These dimensional tolerances are typically governed by international or national standards such as ISO, ASTM, EN, or GB (Chinese national standards), depending on the material and application. It is recommended to confirm the applicable standard with the supplier to ensure compliance with your project specifications.

Q6 Is it possible to get pipes with outer diameters not listed in this table?

The table covers a standard range from 200mm to 1000mm outer diameter. For diameters outside this range — either smaller or larger — custom manufacturing may be available. Please consult directly with the supplier or manufacturer to discuss feasibility, lead times, and any additional cost implications for non-standard sizes.

Wholesale China Suppliers for Oversized Fused Quartz Tubes - High Temperature Applications from Leading Factory Factories, Products

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