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 Custom Transparent Quartz Glass Ring - High Temperature Resistant Insulation Ring from China Suppliers & Factory Suppliers, Products

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High-Quality Custom Transparent Quartz Glass Ring - High Temperature Resistant Insulation Ring from China Suppliers & Factory Suppliers, Products

Our quartz rings, produced in China, are high-purity components crafted from fused silica. These rings provide excellent thermal stability and can withstand high temperatures up to 1100°C, along with featuring low thermal expansion. They are known for outstanding light transmittance and exceptional resistance to acids and corrosion, making them ideal for a variety of applications. These superior electrical insulators offer high dimensional accuracy and robust mechanical strength, making them essential in semiconductor manufacturing, high-temperature furnaces, optical devices, laboratory equipment, and the photovoltaic industry. As reliable sealing rings, insulation parts, and structural components, our quartz rings are designed to perform in harsh environments. Trust our factory as a leading supplier of quartz rings for all your industrial needs.

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Product Description

Product 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

📐 All dimensions are in millimeters (mm). Tolerances increase proportionally with outer diameter size. Custom dimensions are available upon request.

❓ Frequently Asked Questions

Q What do the outer diameter and inner diameter values in the table represent?

A The outer diameter refers to the total external measurement of the component, while the inner diameter refers to the bore or hole diameter. Multiple inner diameter options (e.g., 15/20) indicate available configurations for that outer diameter size.

Q Why do tolerance values increase as the diameter gets larger?

A Larger components inherently involve greater material volume and machining complexity. As the outer diameter increases from 20mm to 300mm, the dimensional tolerances widen accordingly — from ±0.2mm to ±1.5mm — to account for practical manufacturing limitations while maintaining functional precision.

Q Can I request a custom height outside the listed range?

A Yes. The height ranges listed in the table (e.g., 5～20mm, 10～150mm) represent standard production ranges. Custom heights beyond these ranges may be available depending on the outer diameter and material. Please contact us with your specific requirements for a feasibility assessment.

Q Are tighter tolerances available for precision applications?

A The tolerances listed represent standard manufacturing specifications. For applications requiring tighter tolerances — such as aerospace, medical, or high-precision industrial uses — customized machining options may be available. Please reach out to discuss your specific tolerance requirements.

Q What is the height tolerance difference between outer diameter and height for larger sizes?

A For larger sizes (150mm and above), the height tolerance is intentionally kept tighter than the outer and inner diameter tolerances. For example, at 200mm outer diameter, the diameter tolerances are ±1.0mm while the height tolerance remains ±0.8mm. This reflects the importance of axial precision in many assembly applications.

Q How should I select the correct inner diameter for my application?

A When multiple inner diameter options are listed for a given outer diameter, selection depends on your shaft size, wall thickness requirements, and load-bearing needs. A thicker wall (larger difference between outer and inner diameter) generally provides greater structural strength, while a thinner wall reduces weight and material cost.

High-Quality Custom Transparent Quartz Glass Ring - High Temperature Resistant Insulation Ring from China Suppliers & Factory Suppliers, Products

Product Description

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