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 Purity Custom Transparent Quartz Glass Rings - China Suppliers & Factory for High-Temperature Insulation Components Supplier, Product

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High-Quality High Purity Custom Transparent Quartz Glass Rings - China Suppliers & Factory for High-Temperature Insulation Components Supplier, Product

Quartz rings manufactured in China are high-purity components crafted from fused silica, known for their exceptional thermal stability and high-temperature resistance of up to 1100°C. These rings feature low thermal expansion and outstanding light transmittance, making them ideal for various applications. Renowned suppliers and factory producers offer quartz rings that exhibit strong acid and corrosion resistance, as well as superior electrical insulation properties. With their high dimensional accuracy and impressive mechanical strength, these quartz rings play a vital role in semiconductor manufacturing, high-temperature furnaces, optical devices, laboratory equipment, and photovoltaic industries. They serve as reliable sealing rings, insulation parts, and structural components in demanding environments, ensuring longevity and performance

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📊 Standard Dimensional Specifications & Tolerances

📐 All dimensions are in millimeters (mm). Tolerances apply to standard production conditions. Custom sizes and tolerances are available upon request.

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

🔵 What unit of measurement is used in the dimensional specification table?

✅ All dimensions listed in the table — including outer diameter, inner diameter, and height — are expressed in millimeters (mm). Tolerances are also stated in millimeters (mm).

🔵 Why does the tolerance increase as the outer diameter gets larger?

✅ Larger components naturally have greater dimensional variation during manufacturing due to increased material volume and machining complexity. Tolerances are scaled accordingly — from ±0.2 mm for small diameters (20 mm) up to ±1.5 mm for larger diameters (300 mm) — to reflect realistic and achievable manufacturing precision.

🔵 Can custom outer diameter and inner diameter combinations be ordered?

✅ Yes. The table provides standard size combinations for reference. Each outer diameter is offered with multiple inner diameter options (e.g., OD 80 mm is available with ID 50, 60, or 70 mm). Custom combinations outside the listed options can be discussed with our engineering team based on your application requirements.

🔵 What is the maximum height available for each size?

✅ The maximum height varies by outer diameter. For example, OD 20 mm supports heights up to 20 mm, while OD 300 mm supports heights up to 150 mm. The height range for each size is clearly listed in the "Height" column of the specification table above.

🔵 Are tighter tolerances available for precision applications?

✅ The tolerances shown in the table represent our standard manufacturing specifications. For applications requiring tighter dimensional control, please contact us directly. We can evaluate precision machining options depending on the size range and quantity required.

🔵 Is the height tolerance different from the diameter tolerance for larger sizes?

✅ Yes, for larger sizes the height tolerance is often tighter than the diameter tolerance. For instance, at OD 150 mm, the diameter tolerance is ±0.8 mm while the height tolerance is ±0.5 mm. At OD 300 mm, the diameter tolerance is ±1.5 mm while the height tolerance is ±1.0 mm. This reflects the different machining processes used for axial versus radial dimensions.

High-Quality High Purity Custom Transparent Quartz Glass Rings - China Suppliers & Factory for High-Temperature Insulation Components Supplier, Product

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