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 Fused Quartz Tube Suppliers in China - High Temp Applications from Reliable Factory Supplier, Factory

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Custom Oversized Fused Quartz Tube Suppliers in China - High Temp Applications from Reliable Factory Supplier, Factory

Discover our premium large-diameter quartz tubes, manufactured from high-purity quartz material in China. With diameters ranging from tens of centimeters up to one meter, these quartz tubes are engineered to withstand high temperatures and corrosive environments while offering superior light transmittance. Ideal for large high-temperature furnaces, our quartz tubes are essential components in industries such as photovoltaics, semiconductors, and metallurgy. As a leading factory and supplier, we specialize in large-scale production, ensuring that our products meet the rigorous demands of heat treatment equipment across various applications.

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Product Description

Product Specifications

⌀ Outer Diameter (mm)	↔ OD Tolerance (mm)	▣ Wall Thickness (mm)	± WT 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 does the outer diameter tolerance mean in this specification table?

The outer diameter (OD) tolerance refers to the permissible deviation from the nominal outer diameter during manufacturing. For example, a pipe with an OD of 200 mm may have an actual OD ranging within ±2.0 to ±3.0 mm, ensuring it still fits standard fittings and connections.

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

Larger diameter pipes (700 mm and above) are heavier and more difficult to handle, transport, and install. To manage structural integrity and logistical challenges, the standard length is reduced — from up to 2000 mm for smaller diameters to 1500 mm or 1800 mm for larger ones.

Q Can I order pipes with custom wall thickness outside the standard range?

Yes, custom wall thickness options are typically available upon request. The standard wall thickness ranges listed in the table represent the most commonly used specifications. Please contact our technical team to discuss custom requirements based on your specific application and pressure rating needs.

Q How is wall thickness tolerance controlled during production?

Wall thickness tolerance is maintained through precision casting and machining processes, combined with strict quality control inspections using ultrasonic testing and dimensional gauging. The tolerance values listed ensure consistent performance under rated pressure and load conditions.

Q Are these specifications compliant with international standards?

The dimensional specifications in this table are designed to align with widely recognized international standards such as ISO, EN, and ASTM guidelines for large-diameter pipes. Specific compliance documentation and material certifications can be provided upon request.

Q What applications are these large-diameter pipes typically used for?

Pipes in the 200 mm to 1000 mm outer diameter range are commonly used in industrial pipeline systems, municipal water and sewage infrastructure, oil and gas transmission, chemical processing plants, and structural engineering applications where high load-bearing capacity and dimensional precision are critical.

Custom Oversized Fused Quartz Tube Suppliers in China - High Temp Applications from Reliable Factory Supplier, Factory

Product Description

Product Specifications

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