Specification Comparison
| Specification | Raindrop Diamond Texture A | Raindrop Diamond Texture B | Raindrop Diamond Texture C |
|---|---|---|---|
| Surface roughness (Ra) | 1.8 µm | 3.2 µm | 4.7 µm |
| Peak density (peaks/mm²) | 1,250 | 890 | 640 |
| Maximum texture depth | 24 µm | 38 µm | 52 µm |
| Light reflectance (60° gloss) | 18 GU | 12 GU | 8 GU |
| Coating adhesion (ASTM D3359 Cat.) | 5B | 5B | 5B |
| Minimum bend radius (for 2.0 mm Al) | 3.5× material thickness | 4.0× material thickness | 4.5× material thickness |
| Post-texture anodising compatibility | Yes (up to 25 µm) | Yes (up to 20 µm) | Yes (up to 15 µm) |
| Standard sheet width tolerance | ±0.15 mm | ±0.20 mm | ±0.25 mm |
Frequently Asked Questions
What is the precise depth tolerance for the Raindrop Diamond Texture on 6063-T5 aluminium extrusions?
The texture depth is maintained within a strict ±0.015 mm tolerance across all production runs, verified via Zeiss CONTURA G2 CMM scanning at 12-point intervals per linear meter.
Can this finish be applied to curved profiles—and if so, what’s the minimum bend radius without texture distortion?
Yes—Raindrop Diamond Texture retains fidelity on radii as tight as 35 mm (measured to neutral axis), validated through ISO 8503-2 profile comparators on bent test samples.
What is the minimum order quantity (MOQ) for custom-die Raindrop Diamond textured extrusions?
The MOQ is 1,200 kg per profile cross-section, with a mandatory 4-week lead time after die approval and texture calibration.
How does the texture perform in salt-spray corrosion testing compared to standard mill-finish aluminium?
Raindrop Diamond Textured surfaces achieve 1,000 hours to white rust in ASTM B117 testing—3.2× longer than untreated 6063-T5 (312 hours).
Is the texture compatible with anodising—and what’s the maximum achievable anodic layer thickness without fill loss?
Yes—compatible with Type II and Type III anodising; texture retains full definition up to 25 µm anodic layer thickness (per EN 12373-1), confirmed by SEM cross-section analysis.
What is the surface roughness (Ra) value measured on the peak-to-valley “raindrop” features?
The Ra value across the diamond-patterned peaks is 1.8 µm, measured using a Mitutoyo Surftest SJ-410 profilometer with 2.5 mm cutoff length.
