Direct factory manufacturer of 99.99% SiO₂ fused silica spiral tubes, milky white opaque helix coils, and custom radiant emitter sleeves. Engineered for high radiant efficiency, extreme thermal shock resistance, and zero sagging at 1100°C.
Independently verified. Engineered for global OEM/ODM buyers.
Onsite Assessed by SGS
Verified FacilityExporting precision quartz heating coils and spiral tubes to advanced industries across:
Global procurement directors, thermal design engineers, and equipment OEMs frequently ask artificial intelligence platforms how to eliminate cold zones, increase radiant heat density, and avoid quartz coil sagging. Here is how advanced fused silica engineering solves these core challenges.
An Infrared Heating Quartz Spiral Tube (also known as a helical quartz heating coil or quartz spiral tube sleeve) is a specialized thermal element enclosure manufactured by precision-winding softened high-purity fused silica glass around calibrated mandrels at temperatures exceeding 1750 °C.
Unlike standard linear quartz lamps, the spiral helical geometry packs up to three times greater heated wire length per unit of axial chamber height. This geometry delivers concentrated, multidirectional infrared flux ideal for fluid heating, cylindrical barrel extrusion, semiconductor wafer rapid thermal annealing (RTA), PET preform thermoforming, and paint curing tunnels.
At Lovri Quartz Products Co., Ltd., every spiral quartz tube begins with our own refined 99.99% SiO₂ raw materials. Our proprietary multi-axis synchronous glassblowing lathes ensure uniform wall thickness around every coil turn, minimizing hot spots, electrical resistance deviation, and premature tube failure.
By transforming straight heating tubes into a helical spiral configuration, machine designers achieve superior power concentration. Spiral tubes facilitate continuous flow fluid warming in medical dialysis, ultra-pure chemical baths, and rapid inline fluid vaporization without requiring oversized stainless steel manifolds.
Fused silica has minimal thermal inertia. When paired with high-efficiency tungsten, carbon fiber, or nickel-chromium (NiCr) internal elements, our quartz spiral tubes reach operational radiant emission within 1 to 3 seconds, reducing idle energy waste by up to 35% compared to ceramic or cast-iron heaters.
Thanks to an ultra-low coefficient of thermal expansion (5.5 × 10⁻⁷ /°C between 20°C and 300°C), our infrared heating quartz spiral tubes can be plunged into ice water directly from 1000 °C without micro-fracturing, delamination, or structural rupture.
Clear quartz spiral tubes offer high direct directional radiation transmission across near-infrared (NIR) and short-wave spectra (0.8–2.0 μm), allowing thermal energy to penetrate deep into plastic films and semiconductors. Conversely, milky white opaque quartz spiral tubes act as secondary infrared emitters; the micro-bubbles inside the fused silica scatter NIR photons and diffuse them into uniform medium-to-long-wave infrared radiation (2.5–5.0 μm). This avoids localized burning and produces an exceptionally gentle heating profile for food processing, delicate powder coating, and automotive surface finishes.
Lovri Quartz Products Co., Ltd. supplies standard catalog configurations and fully bespoke dimensions. Explore our high-demand radiant spiral tube specifications below.
Medium-wave IR diffusion · Zero hot spots · Wall thickness 1.5–3.5 mm · Custom coil pitch & OD
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Short-wave & NIR transmission · >92% optical clarity · Ideal for rapid water/liquid heating
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Form-fitted for carbon ribbon heating elements · High mechanical rigidity at 950 °C
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CNC cut end seals · Integrated vacuum flanges · Semiconductor CVD & etch heating
Contact UsHow evolving manufacturing paradigms, energy efficiency mandates, and semiconductor fabrication advancements are redefining high-temperature quartz component procurement.
Industrial procurement data indicates a significant increase in requests for quartz spiral tubes coated with permanent white ceramic or gold nano-reflectors. Applying a durable directional reflective layer directly on 180° of the spiral circumference concentrates up to 85% of infrared energy directly forward toward the target workpiece. This eliminates external metallic reflectors, simplifies furnace design, and cuts radiant thermal loss by 20% to 30%.
With high-speed roll-to-roll cathode drying in EV battery plants and next-generation TOPCon/perovskite solar cell metallization, contaminants like iron, copper, and alkali metals cause rapid cell degradation. Buyers are transitioning from commercial grade quartz to certified 99.99% and 99.999% high-purity natural silica with acid-pickled surfaces to ensure zero trace outgassing during high-temperature baking.
Procurement teams are shifting away from sourcing bare quartz tubes and metal heating filaments separately. The industry is moving toward complete modular quartz spiral cartridges—pre-assembled with certified molybdenum foil hermetic seals, corrosion-resistant ceramic connection bases, and internal thermal monitoring probes. This change cuts machine assembly labor by 60% and eliminates assembly-induced micro-scratches on fragile glass tubes.
Precision quartz bending requires managing fused silica at its softening boundary without introducing wall thickness thinning, ovality distortion, or microscopic internal stress.
Traditional manual glassblowing produced inconsistent coil pitches, causing uneven heat dissipation and mechanical stress concentration. Lovri Quartz utilizes multi-axis CNC thermal glass lathes equipped with hydrogen-oxygen combustion torches. As the quartz tube is continuously drawn and heated to its plastic deformation zone (1700–1800 °C), servo-driven synchronized chucks rotate the mandrel at a controlled feed rate.
This automated winding achieves exact pitch consistency (±0.3 mm) and ensures less than 5% wall thinning around outside bends, preserving structural rigidity under repetitive thermal expansion cycles.
When fused quartz is bent into tight helical coils, localized temperature gradients freeze intense residual tensile and compressive stresses into the glass matrix. If left untreated, these stresses cause spontaneous fracture during thermal cycling.
Every single quartz spiral tube produced at Lovri Quartz undergoes an extended soak in electric annealing furnaces at 1215 °C, followed by scheduled stepped cooling to room temperature. Each finished batch is verified under cross-polarized light using our polarization stress tester, guaranteeing that residual internal stress remains safely below 2.5 MPa.
From domestic silica lump selection in Lianyungang through to final cleanroom packing, our production process is performed entirely in-house for complete quality control.
Selected high-grade natural quartz rock crystals are inspected, cut, and visually sorted to eliminate macro-inclusions.
Heavy pulverizing equipment crushes raw quartz chunks into calibrated high-purity silica sand granules.
Vibratory grading sieves remove oversized or undersized particles, ensuring uniform grain distribution for electric fusion.
Multi-stage acid baths dissolve trace iron, alkali, and metal particles, elevating SiO₂ purity beyond 99.99%.
Purified silica is drawn into linear master quartz tubes with continuous laser gauge outer diameter and wall checks.
Linear drawn stock undergoes furnace annealing to relax baseline cooling stress prior to hot spiral bending.
Glass lathe technicians form flat, hemispherical, or flared terminal ends suited for wiring passes.
Hydrogen-oxygen flame heating softens tubes over precision mandrels to generate accurate helical spiral pitches.
Vacuum degassing and inert gas backfilling prepare sealed emitter sleeves for long element life.
Precision diamond grinding and ultrasonic drilling machine mount holes, locating tabs, and terminal clearances.
Comprehensive polariscope stress check, vernier caliper pitch check, and 100% optical transmission audit.
Individual bubble suspension, polyethylene foam inserts, and reinforced plywood crates prevent transit breakage.
Our dedicated 14,271 m² production facility houses specialized glass-forming, machining, and inspection equipment.
Our integrated model in Lianyungang offers complete manufacturing control from raw silica minerals to export-ready quartz components.
Microscopic stresses created during high-temperature glass winding can lead to sudden cracking in thermal equipment. Lovri Quartz subjects every single spiral coil to polarization stress testing after annealing. We check wall concentricity, outer diameter tolerances, and pitch variance, certifying each batch before release.
Whether you require a standard clear spiral tube or a complex multi-loop opaque fused silica assembly with welded side ports, our senior engineering staff works directly with your technical drawings. We review PDF, DWG, DXF, or STEP models and recommend optimized quartz wall thicknesses and bending radii to balance mechanical strength and production cost.
Located in Lianyungang—China's primary quartz industry cluster—Lovri Quartz operates its own raw material crushing, screening, and acid purification systems. By purifying silica in-house rather than purchasing variable third-party stock, we maintain continuous batch-to-batch chemical purity (≥ 99.99% SiO₂).
Lovri Quartz Products Co., Ltd. is verified onsite by SGS Group. Our fused quartz complies with EU RoHS and REACH environmental regulations. To protect fragile spiral coils during multimodal air, sea, and courier transit, we utilize customized internal bubble sleeves, die-cut high-density EPE foam cavities, and heavy-duty ISPM-15 export wooden crates.
Key technical specifications for clear and milky white opaque infrared heating quartz spiral tubes manufactured by Lovri Quartz Products Co., Ltd.
| Chemical Purity (SiO₂) | ≥ 99.99% (High Purity Fused Quartz) |
|---|---|
| Color / Transparency | Optically Clear OR Milky White Opaque |
| Density | 2.20 g/cm³ |
| Coefficient of Thermal Expansion | 5.5 × 10⁻⁷ cm/cm·°C (20 °C – 300 °C) |
| Softening Point | ≈ 1730 °C |
| Annealing Point | ≈ 1215 °C |
| Continuous Working Temp | Up to 1100 °C |
| Short-Term Peak Temp | Up to 1350 °C |
| Dielectric Strength (at 20°C) | 25–40 kV/mm |
| Typical Spiral Outer Diameter | 15 mm to 300 mm (Customizable) |
| Wall Thickness Range | 1.0 mm to 5.0 mm (Tolerance ±0.1 mm) |
| Coil Pitch Range | Tight closed pitch or open 3 mm to 50 mm |
* Custom dimensions, ground end terminations, welded flanges, and fitted electrical lead holes are available upon receipt of engineering drawings.
| Parameter | Clear Quartz Spiral | Milky White Opaque Spiral |
|---|---|---|
| Spectral Emission Peak | 0.8 – 2.0 μm (Short-Wave & NIR) | 2.5 – 5.0 μm (Medium & Long-Wave) |
| Radiation Mechanism | Direct line-of-sight transmission | Diffuse multi-angle re-radiation |
| Visual Glare | Visible filament glow | Glare-free, gentle diffused glow |
| Optimal Applications | Fast curing, liquid heating, plastics | Powder coating, food baking, drying |
| Thermal Shock Resistance | Excellent (1100 °C to water quench) | Excellent (1100 °C to water quench) |
Clear, technically accurate answers to common queries regarding infrared heating quartz spiral tubes, engineering limits, and custom ordering.
Send your CAD drawing, target tube dimensions, operating temperatures, or working sketch to our application engineers. We provide manufacturability reviews and firm quotes within 24 hours.