Custom Square, Rectangular & Shaped Quartz Tubes

Parameter	Factory Standard	Manufacturing Limit
Width / Height	5–100 mm	Larger on request
Wall thickness	0.5–6 mm	Up to 15 mm on request, profile-dependent
Bore width & height	Set by outer size minus wall	—
Corner radius	0.3–3 mm	Sharper radius reduces achievable wall uniformity
Length	Up to 3,000 mm	Longer via tube-to-tube welding
Outer profile tolerance	±0.1–0.3 mm	Tighter, confirmed per order

Inquiry

Custom Square, Rectangular & Shaped Quartz Tubes

Quartz Glass forms quartz tubing into square, rectangular, and other non-round profiles for applications where a round tube won't fit the fixture, window, or mounting geometry.

Outer size, wall thickness, corner radius, and profile tolerance move together. A tighter corner radius or thinner wall on one face doesn't come free elsewhere in the cross-section — confirm the full profile, not one dimension in isolation.

Available Square, Rectangular & Shaped Quartz Tubes Configurations

Shaped tubing is drawn or redrawn from round stock into the target profile — square, rectangular, D-shaped, or other custom outer/inner combinations. Both a shaped outer profile with a round bore, and a shaped bore inside a round outer wall, are possible; tell us which surface (or both) needs to match your profile.

Square, Rectangular & Shaped Quartz Tubes Factory Standard & Manufacturing Limit

The table above is what's repeatable without added lead time. Corner radius is the figure most often traded off against wall uniformity — a sharper corner thins the wall locally as it forms, so very sharp corners paired with thin walls need confirmation before we commit to a schedule.

Corner Radius, Wall Uniformity and Profile Tolerance

Wall uniformity is checked around the full profile, not just at the flats — corners are where thinning shows up first. If your application needs a guaranteed minimum wall at the corner specifically (not just an average), say so on the drawing; it changes how we grind and inspect the part.

Twist along the tube length is also checked on shaped profiles, since a shaped cross-section shows twist more visibly than a round one does.

Custom Fabrication, End Finishing and Joining

Cutting, grinding, and fire-polishing follow the same process as round tubing, adapted to the flat faces and corners. End hot-forming (closing an end, or forming a step) is available on request. For welding two shaped sections together, the profiles need to match exactly at the joint — send both drawings if the two ends come from different orders.

5–100 mmReference Side Range

0.5–15 mmGeneral Wall Envelope

±0.1–0.3 mmReference Side Tolerance

4+Profile Families

≥99.99%Natural SiO₂ · synthetic ≥99.999%

≤1100 °CContinuous Service Guideline

Specifications

Square, Rectangular & Shaped Tube Specifications

Parameter	Reference Capability / Requirement
Outer Profile	Square, rectangular, round-to-square or drawing-specific
Inner Profile	Square, rectangular, round or custom passage
Width / Height	Reference side range 5–100 mm
Wall Thickness	0.5–15 mm general tube envelope; profile-dependent
Corner Radius	Specified for outside and inside corners
Profile Tolerance	Reference side tolerance profile-specific formed tolerance; agree OD/width/height by drawing
Straightness	Specified over the finished cut length
Length	Drawing-specific according to profile and redraw route
End Finish	As-cut / ground square / fire-polished

Standard Series

Reference Side & Profile Series

Outer Size	Inner Profile	Wall / Corner	Typical Use
10 × 10 mm	Square or round	By drawing	Compact flow cells and instrument guides
15 × 15 mm	Square	By drawing	Sensor housings and optical paths
20 × 20 mm	Square or round	By drawing	Laboratory and industrial assemblies
25 / 30 mm	Square / rectangular	By drawing	Guide rails and process channels
40 / 50 / 60 mm	Custom	By drawing	Observation and thermal components
80 / 100 mm	Custom	Drawing review	Large shaped chambers and equipment interfaces

Dimensional Tolerances

Side, Wall & Corner Reference Tolerances

Feature	Size / Condition	Reference Tolerance
Width / Height	5–100 mm	Reference profile-specific formed tolerance; agree OD/width/height by drawing
Wall Thickness	1–3 mm	±0.10–0.15 mm
Wall Thickness	3–5 mm	±0.15–0.20 mm
Wall Thickness	5–10 mm	±0.20–0.30 mm
Corner Radius	Inside / outside	Profile- and tooling-specific
Straightness	Finished length	Defined on drawing
Cut Length	Ground ends	±0.5 mm standard; ±0.1 mm precision where geometry permits

Configurations

External & Internal Profile Options

Square Outside / Square InsideUniform square wall with defined corner radii

Square Outside / Round InsideMechanical square envelope with a circular flow path

Rectangular TubeIndependent width and height for low-profile assemblies

Round-to-Square TransitionHot-formed transition between equipment interfaces

Triangular ProfileThree-sided outer or inner passage to drawing

D-Shape TubeFlat datum surface with a rounded outer profile

Grooved ProfileLongitudinal guide or alignment features

Custom Redrawn ProfileTooling developed from a dimensioned cross-section

Material Selection

Quartz Grades for Shaped Profiles

Electric-Fused QuartzGrade-specific UV cut-offOH 5–150 ppm; heat treatment can adjust OH. General-purpose continuously drawn stock. Confirm UV boundary by grade datasheet.

Flame-Fused Quartz · JGS2220–2500 nmOH 120–260 ppm; UV-visible optical components.

Synthetic Fused Silica · JGS1185–2500 nmSiO₂ ≥99.999%; OH ≈1000 ppm. Selected for deep-UV transmission; strong OH absorption near 2730 nm.

Vacuum-Fused / Low-OH · JGS3Grade-specific UV–IR / 260–3500 nmVacuum-fused OH <3 ppm; JGS3-class OH ≤10 ppm. Use the lot certificate and transmission curve at the working thickness.

OH content varies by grade and batch; the lot certificate is authoritative. Compare material routes and typical transmission data.

Fabrication

Profile Drawing, Redrawing & End Finishing

Profile ToolingOuter and inner cross-sections converted into redraw tooling
Precision RedrawingSide size, wall and corner geometry controlled during hot draw
Cut-to-LengthProfile cut without crushing or distorting the cross-section
End GrindingSquare end face for mechanical seating and sealing
Hot FormingTransitions, bends and local features formed to drawing
Profile InspectionWidth, height, wall, corners and straightness checked after processing

Applications

Shaped Quartz Tube Applications

Observation AssembliesFlat-sided transparent paths for equipment viewing

Instrument Guide RailsNon-rotating profiles for alignment and linear positioning

Flow CellsSquare or rectangular passages for optical and fluid analysis

Sensor HousingsDefined outer datums for mounting probes and electrodes

Thermal Process ChannelsHigh-temperature shaped paths around heaters or samples

Custom Equipment InterfacesProfiles matching non-round seals, frames and supports

FAQ

Frequently Asked Questions

What side sizes are available for square quartz tubes?

Reference side sizes run from 5–100 mm, with common series at 10, 15, 20, 25, 30, 40, 50, 60, 80 and 100 mm.

Can the outer and inner profiles be different?

Yes. Square-outside/round-inside, rectangular and other combinations can be reviewed from a dimensioned cross-section.

How are corner radii specified?

Dimension the inside and outside corner radii separately because tooling, wall distribution and final side tolerance are coupled.

Are prototypes available?

Yes. One-piece prototypes are welcome; custom redraw tooling and minimum production length are quoted after profile review.

Need a square, rectangular or shaped quartz tube?Send the outer profile, inner passage, side dimensions, wall, corners and finished length.

Open the Tube Configurator

Engineering Data

Grade-Qualified Material Purity

Electric-fused / flame-fused quartz: SiO₂ ≥99.99%; synthetic JGS1-grade fused silica: ≥99.999%. Grade and lot certificate govern supplied material.

Engineering Data

Service Temperature

Transparent quartz: continuous use ≤1100 °C; short-term excursions ≤1200 °C. Opaque / milky quartz: continuous use ≤1000 °C. Load, atmosphere, support span and thermal cycling determine the application limit.

Engineering Data

Formed Stock versus Cold-Cut Dimensions

Formed stock and finished cut parts use different length tolerances. Continuously drawn transparent stock: ±1.0 mm at OD ≤50 mm / ±2.0 mm at OD >50 mm. Rotationally fused opaque stock: ±5.0 mm. Cold-cut finished parts: standard ±0.5 mm; precision ±0.1 mm only where agreed for the finished geometry.

The round-tube OD table does not specify square width, rectangular height or corner radius. Profile dimensions and bow require an agreed section drawing.