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 Custom High-Temperature Quartz Glass Ring - China Suppliers & Factory for Insulation and Sealing Applications Product, Products

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Wholesale Custom High-Temperature Quartz Glass Ring - China Suppliers & Factory for Insulation and Sealing Applications Product, Products

Discover our high-quality quartz rings, expertly crafted from fused silica, boasting remarkable thermal stability and the ability to withstand temperatures up to 1100°C. As a leading China supplier and factory of quartz products, we ensure our rings offer low thermal expansion, exceptional light transmittance, and superior resistance to acids and corrosion. These quartz rings also excel in electrical insulation, making them ideal for demanding applications in semiconductor manufacturing, high-temperature furnaces, optical devices, and laboratory equipment. With precise dimensional accuracy and robust mechanical strength, our quartz rings serve as essential sealing rings, insulation parts, and structural components in challenging environments.

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Product Description

Dimensions & Tolerance Specifications

Outer diameter	Inner diameter	Height	Outer diameter tolerance	Inner diameter tolerance	Height tolerance
20	10	5～20	±0.2	±0.2	±0.2
30	15/20	5～30	±0.2	±0.2	±0.2
40	20/30	5～30	±0.2	±0.2	±0.2
50	30/40	5～50	±0.3	±0.3	±0.3
60	40/50	5～50	±0.3	±0.3	±0.3
80	50/60/70	10～60	±0.3	±0.3	±0.3
100	60/80/90	10～80	±0.5	±0.5	±0.5
120	80/100	10～80	±0.5	±0.5	±0.5
150	100/120	10～100	±0.8	±0.8	±0.5
200	150/180	10～120	±1.0	±1.0	±0.8
250	200/220	10～120	±1.2	±1.2	±0.8
300	250/280	10～150	±1.5	±1.5	±1.0

Frequently Asked Questions

Q What range of outer diameters is available?

The available outer diameter spans from 20 up to 300, including multiple intermediate dimensions such as 30, 40, 50, 60, 80, 100, 120, 150, 200, and 250.

Q Can the height be adjusted within a specific outer diameter?

Yes, height is specified as a variable range for each size. For example, outer diameter 20 supports heights between 5～20, whereas outer diameter 300 supports heights between 10～150.

Q How do the dimensional tolerances vary across sizes?

Tolerances scale proportionally with component size. Diameters between 20 and 40 maintain tight tolerances of ±0.2, scaling to ±0.3 for mid-range sizes (50–80), and reaching up to ±1.5 for the largest outer diameter of 300.

Q Are multiple inner diameter options available for each outer diameter?

Yes. Most outer diameter sizes offer multiple inner diameter configurations. For instance, outer diameter 80 provides options of 50, 60, or 70 inner diameter, and outer diameter 100 provides options of 60, 80, or 90.

Q What is the tolerance specification for height?

Height tolerance ranges from ±0.2 for outer diameters 20 through 40, ±0.3 for outer diameters 50 through 80, ±0.5 for outer diameters 100 through 150, ±0.8 for diameters 200 through 250, and ±1.0 for outer diameter 300.

Q Do inner diameter tolerances match outer diameter tolerances?

Yes, across all standard sizes listed, the inner diameter tolerance and outer diameter tolerance remain identical for every respective dimension bracket.

Wholesale Custom High-Temperature Quartz Glass Ring - China Suppliers & Factory for Insulation and Sealing Applications Product, Products

Product Description

Dimensions & Tolerance Specifications

Frequently Asked Questions

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