About Dongxin Quartz Products Co., Ltd. - Quartz Products Supplier in China

Based in China, Dongxin Quartz Products Co., Ltd. lists five active quartz tube products. The catalogue includes a standard quartz glass tube, a red‑colored quartz tube, a clear quartz tube, a UV‑stop quartz tube (HS code 7002.19) made from fused silica glass with SiO₂ purity greater than 99.9 %, and a big‑diameter quartz glass tube (HS code 7002.31) fabricated from fused silica with 99.99 % SiO₂. All items fall under the HS‑code family 7002, which covers optical glass and glassware. The supplier classifies the range under the single top category “Quartz Products”. The product list reflects a focus on high‑purity fused silica tubes used in optical and industrial applications.

Product Range and Specialties of Dongxin Quartz Products Co., Ltd.

Quartz tubes from fused silica typically meet purity grades of 99.9 % to 99.99 % SiO₂ and exhibit optical transmission above 90 % down to 180 nm. Standard dimensions range from inner diameters of 1 mm to 10 mm, wall thicknesses of 0.5 mm to 2 mm, and lengths of 300 mm, 500 mm, or custom cuts. UV‑stop tubes are often coated with a thin metal‑oxide layer to suppress transmission below 350 nm, while colored tubes use dopants for hue. Buyers usually request specifications such as thermal shock resistance up to 1100 °C, dimensional tolerance ±0.02 mm, and surface roughness Ra < 0.2 µm.

Trade and Export Information - Dongxin Quartz Products Co., Ltd.

China is a major exporter of fused silica glass under HS chapter 70, and the 7002.19 and 7002.31 codes are routinely used for specialty optical tubes. Typical importers include semiconductor manufacturers, photolithography equipment makers, medical device producers, and aerospace component suppliers in Europe, North America, and Southeast Asia. Commonly required certifications are ISO 9001 quality management, CE marking for EU markets, and RoHS compliance for electronic applications. Export shipments are usually packed in wooden crates with anti‑static bubble wrap, placed in 20‑ft or 40‑ft containers, and shipped under FOB or CIF terms.

Sourcing from Dongxin Quartz Products Co., Ltd. - Buyer Guidance

Prospective buyers should request a material test report confirming SiO₂ purity and a transmission spectrum for the specific wavelength range required. A dimensional drawing and MSDS are standard documents to verify mechanical and safety characteristics. Samples of 100 mm length are often supplied for performance testing before a full order. Verify that the HS code on the commercial invoice matches the product (7002.19 for UV‑stop, 7002.31 for big‑diameter) and confirm any additional certifications the buyer needs for their market.

What quartz tube products does Dongxin offer?

The catalogue lists a standard quartz glass tube, a red‑colored tube, a clear tube, a UV‑stop tube (HS 7002.19) made from fused silica with >99.9 % SiO₂, and a big‑diameter tube (HS 7002.31) with 99.99 % SiO₂ purity.

What are the typical dimensions available for these tubes?

Common inner diameters range from 1 mm to 10 mm, wall thicknesses from 0.5 mm to 2 mm, and standard lengths are 300 mm or 500 mm, with custom lengths possible upon request.

Which certifications are normally required for fused silica quartz tubes?

Buyers usually ask for ISO 9001 quality‑management certification, CE marking for EU compliance, and RoHS declaration for electronic applications; the supplier can provide these documents if they are held.

How can I obtain a sample before placing a larger order?

Dongxin can ship a sample segment of approximately 100 mm length, packed in anti‑static bubble wrap; the buyer should specify the tube type and required dimensions in the sample request.

What is the typical minimum order quantity and lead time?

Minimum orders are often set at one full 20‑ft container (approximately 5,000  -  6,000 tubes depending on size) or a negotiated smaller batch; standard lead time after order confirmation is 30 - 45 days.

How are the tubes packaged for international shipment?

Tubes are placed in moisture‑protected wooden crates with individual anti‑static bubble wrap, then loaded into 20‑ft or 40‑ft containers; the packaging meets standard handling requirements for fragile optical glass.

What documentation should I expect for customs clearance?

The commercial invoice will list the appropriate HS code (7002.19 or 7002.31), a packing list, a certificate of origin, and any requested quality certificates such as ISO 9001 or CE.

Are there any special handling instructions for the UV‑stop or big‑diameter tubes?

UV‑stop tubes should be stored away from direct UV exposure to preserve the coating, and big‑diameter tubes require careful handling to avoid chipping; both are shipped with cushioning and labeled as “fragile - handle with care”.