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.

High-Quality High-Quality Oversized Fused Quartz Tubes from China Suppliers | Ideal for High Temp Applications in Factories Manufacturer, Factories

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High-Quality High-Quality Oversized Fused Quartz Tubes from China Suppliers | Ideal for High Temp Applications in Factories Manufacturer, Factories

Large-diameter quartz tubes, produced by leading suppliers in China, are crafted from high-purity quartz material, featuring diameters that can reach up to one meter. These tubes are renowned for their exceptional high temperature and corrosion resistance, along with outstanding light transmittance. As a result, they are ideal for use in large high-temperature furnaces and are essential components in heat treatment equipment. Our factory specializes in the large-scale production of these quartz tubes, catering to industries such as photovoltaics, semiconductors, and metallurgy. Invest in our high-quality quartz solutions to enhance your manufacturing processes

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Product Description

Product Specifications

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

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All dimensions are in millimeters (mm). Tolerances may vary depending on material grade and manufacturing process. Please consult our technical team for custom specifications.

? Frequently Asked Questions

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

The outer diameter tolerance refers to the permissible variation (plus or minus) from the nominal outer diameter during manufacturing. For example, a pipe with an outer diameter of 200 mm may have a tolerance of ±2.0 to ±3.0 mm, meaning the actual diameter can range from 197 mm to 203 mm within acceptable limits.

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

Larger diameter pipes are heavier and more difficult to handle, transport, and install. To maintain structural integrity and ease of logistics, the standard length is reduced for pipes with outer diameters of 700 mm and above, ranging from 1000 to 1800 mm, and further reduced to 1000–1500 mm for diameters of 900 mm and 1000 mm.

Q Can custom wall thicknesses be ordered outside the standard range?

Yes, custom wall thicknesses beyond the listed standard range can typically be manufactured upon request. The feasibility depends on the material, production capabilities, and application requirements. Please contact our technical or sales team to discuss your specific needs and obtain a custom quotation.

Q How is wall thickness tolerance determined for each pipe size?

Wall thickness tolerance is determined based on the nominal outer diameter and the standard wall thickness range. Generally, as the pipe size increases, the allowable tolerance also increases to account for the greater complexity and variability in manufacturing larger pipes. The tolerances listed represent the acceptable deviation from the specified wall thickness.

Q Are these specifications compliant with international standards?

The dimensional specifications and tolerances listed are designed to align with common industry standards. However, compliance with specific international standards such as ISO, ASTM, EN, or DIN depends on the material and application. Please specify the required standard when placing your order so we can ensure full compliance.

Q What factors should I consider when selecting the appropriate wall thickness?

Key factors include the operating pressure and temperature, the type of fluid or material being transported, the installation environment (underground, above ground, or submerged), required service life, and applicable safety standards. A thicker wall generally provides greater strength and durability but increases weight and cost. Our engineering team can assist in selecting the optimal wall thickness for your application.

High-Quality High-Quality Oversized Fused Quartz Tubes from China Suppliers | Ideal for High Temp Applications in Factories Manufacturer, Factories

Product Description

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