Custom OEM Quartz Reactor Tube Suppliers & Exporter

Standard clear fused quartz reactor tubes operate continuously at up to 1100°C – 1150°C without structural deformation. For short excursions or thermal batch cycles, they can withstand up to 1300°C. The annealing point of fused quartz sits at approximately 1215°C, and the softening point is around 1683°C. If your thermal process operates continuously near or above 1200°C, we recommend synthetic high-purity silica or specialized opaque thermal shielding tubes with ultra-low hydroxyl (OH) values (≤5 ppm) to suppress the kinetics of high-temperature devitrification into cristobalite.

Hydroxyl ions (OH¯) act as network terminators within the amorphous silicon dioxide (SiO&sub2;) tetrahedron lattice. Higher hydroxyl content directly lowers the glass viscosity, reduces the softening temperature, and dramatically accelerates cristobalite crystallization (devitrification) when thermal cycling above 1000°C under vacuum or inert gas atmospheres. For high-temperature diffusion furnaces and CVD reactor applications, we specify vacuum-fused low-OH quartz tubes (<20 ppm OH¯) to provide superior thermal sag resistance and maintain optical transparency across prolonged heating campaigns.

Yes. Customization to engineering drawings is our primary core competency. We regularly fabricate:

• Vacuum Flanges: Precision-ground quartz KF (NW16, NW25, NW40, NW50), ISO-LF, and CF flanges with polished O-ring seal grooves.
• Gas Inlet/Outlet Ports: Side-arm gas nozzles, Luer lock fittings, Swagelok-compatible ground joints, ball-and-socket connections, and standard taper joints (14/20, 24/40, 29/32).
• Internal Configurations: Welded quartz frits (porosity 0 to 5), internal gas injector capillary tubes, sample boat guide rails, and multi-zone thermocouple wells.

For standard hot-drawn tubing, outer diameter (OD) and inner diameter (ID) tolerances are typically within ±0.5% of nominal dimension, with wall thickness variation held under 8%. Through secondary cold precision grinding, centerless diamond polishing, and CNC machining, we achieve tighter tolerances down to ±0.05 mm. Surface finishes range from commercially transparent fire-polished surfaces (flame-glazed) to frosted sandblasted profiles (Ra 1.6 – 3.2 μm) or optical polish (Ra < 0.5 nm) on sight windows and viewports.

Never touch quartz tubes with bare hands, as fingerprints deposit alkali metals (sodium, potassium) that trigger rapid localized devitrification at temperatures above 800°C. Clean quartzware using cleanroom gloves. Immerse the tube in a 5%–10% hydrofluoric (HF) acid bath for 3 to 5 minutes to etch off the outermost micron of contaminated silica, or use a 1:1 mixture of hydrochloric acid and deionized water to remove heavy metallic deposits. Follow immediately with a cascade rinse in 18.2 MΩ·cm ultra-pure DI water and dry thoroughly with filtered clean dry nitrogen (CDA).

We maintain an OEM-friendly policy with an MOQ of 1 piece for prototype testing, scientific research institutions, and bespoke chamber retrofits. For mass production runs of thousands of tubes, tiered volume discounts apply. Rapid prototyping lead times typically take 5 to 10 working days upon CAD drawing approval, with urgent 48-hour turnarounds available for in-stock tube stock dimensions.