About Us / FAQ

Our standard grades are 6063-T5, 6060, 6061-T6, 6082 and 6005. Through our CNC division we also machine special alloys such as 1060, 2024, 3003, 5082, 5083, 6005, 7003 and 7075. Casting, extrusion, anodizing, powder coating, electrophoresis and wood-grain transfer are all completed in-house.

They differ in temper. T4 is naturally aged with no artificial ageing (no hardness, about 5% of our volume); T5 is air-quenched and artificially aged (about 90%); T6 is water-quenched and artificially aged (about 5%). Most architectural and industrial profiles ship in T5, while structural parts use T6. We do not produce T3 or T7.

6061 is harder (about 15 vs 12 for 6063) and suits load-bearing structural parts, but its anodized surface is coarser and may show dark patches, so 6061 is normally supplied as mill finish or for machining. For visible parts we recommend 6063, which anodizes to a fine, even finish. 6061-T6 also carries a higher processing cost than 6063-T5, so quotations are given per alloy.

No. We work to a single quality standard: national-standard (GB) aluminium ingot, with no scrap content. We stand behind our profiles 5, 8 and even 10 years after delivery, which is the fundamental difference between us and some small mills.

No. We only supply extruded profiles with surface treatment and deep processing such as CNC machining, bending and welding.

GB-standard anodizing (matte, bright, black), sandblasting, powder coating (including AkzoNobel powders), PVDF fluorocarbon coating, electrophoresis (gloss and matte), wood-grain transfer (SALID and Monfis films) and hard anodizing. Matte anodizing is our signature finish.

Yes for powder coating, including RAL colours and matching your samples. Vivid shades (bright red, green, blue) and metallic/sparkle finishes need separate confirmation and are charged additionally. Anodizing is limited to our fixed colour range (GB matte, black and similar); standard long-length bestsellers cannot be colour-adjusted, while outsourced colours offer more flexibility.

Anodizing, electrophoresis, bright dip, brushing and sandblasting all require racking for electrical contact, which leaves a small contact mark at both ends of each profile. Jig marks are included by default; if they must be removed (typically the last 3-5 cm at each end), please note it on the order as it is charged separately. If you cut each length into several pieces, tell us the finished length in advance so that an intermediate racking mark does not affect your cutting.

Profiles up to 1.2 m are anodized vertically on dedicated jigs, so neither length nor thickness affects the rack contact area. Beyond 1.2 m, horizontal anodizing is required and a visible contact mark may appear where thickness exceeds 20 µm. A 30 µm coating is available up to 4.5 m, and 50 µm up to 3.2 m. For outdoor long lengths we recommend electrophoresis (matte or gloss) instead of standard anodizing; for coastal environments, 15-20 µm is advised. If required, we drill 6 mm holes at both ends for bolt fixing, and the cut ends will show bare metal.

Solid sections must go through a core-black removal step before anodizing, otherwise dark core defects appear after the finish. Please state that the section is solid when ordering so the process can be planned accordingly.

Anodized profiles: up to 6.8 m in colour and 7.2 m in natural finish. Powder coated: 6.3 m on the vertical line and 7.5 m on the horizontal line. Large sections (for example 300×300×4.5 mm) are processed externally, up to 9.2 m coated and 11.5 m mill finish. Container loading limits are covered in the logistics FAQ.

Standard sawing: +10/-0 mm. Precision sawing: ±0.2 mm, with ±0.1 mm available on request and subject to separate confirmation.

For profiles 3-6 m long, bow is controlled within 0.4 mm per metre. Profiles outside this limit are rejected before shipment.

We follow the Chinese national standard (GB), adjusted for section geometry and size; no standard is absolute, so the drawing and tolerance sheet confirmed by both parties govern. We can supply our tolerance and hardness reference table for engineering selection.

Send us the drawing and our engineering team will review it first. If it can be extruded we quote the die cost and the refund condition together; if the die or extrusion ratio makes it unfeasible, we tell you before quoting rather than after the die is made.

5. Can you extrude sections with very small openings and tight tolerances?

Weight (kg) = width (m) × 2.72 × thickness (mm) × length (m). For a 1220×2440×3.0 mm plate: 1.22 × 2.72 × 3.0 × 2.44 ≈ 24.29 kg.

500 kg per model per colour, or 1-2 tonnes when several sizes of the same series are combined. Below MOQ a one-off set-up charge applies, calculated from the press and section. Stock items (floor channel/glass clamp and some square tube) ship from 100 kg.

It is calculated per model per colour: one model in one colour is about 300 kg; three models in the same colour total about 900 kg; five models in the same colour total about 1.5 tonnes. Matching accessories are not counted in these quantities.

Existing dies cover square tube (over a thousand sizes), assembly-line profiles, floor channel/glass clamp, cabinet profiles, handles and frames, cleanroom profiles, plus standard dies for windows, insect screens, fencing and louvres. Stock items are floor channel and part of the square tube range, with cleanroom profiles being added. Before using a shared die we re-confirm its condition and metre weight to avoid obsolete tooling and weight deviation.

Floor channel is normally sold by metre because the dies are ours and the metre weight is controlled. Square tube uses shared dies where metre weight varies, so pricing by tonne is safer; pricing by metre carries a coefficient. The quotation states the basis used.