45 x 180 mm Aluminium Extrusion for Typhoon-Zone Frames

Philippine buyers specifying outdoor canopies, hoardings, yard enclosures, shade and light solar frames in the typhoon belt need a 45 × 180 mm section that can take wind load through its strong axis and survive salt air. GrownParts extrudes and finishes this section in China and exports to Manila and other Philippine ports—we do not operate a local mill. The profile is rarely the first thing that fails; the base plate, anchors and post-to-rail joints are.

GrownParts exports GP-SP-45180-10S-PH (6063-T5, ~6.20 kg/m, ten 10.2 mm slots on a 45 mm pitch) from Shanghai / Ningbo, cut to length with AA20 or AA25 anodising for coastal sites. We are not a Philippine mill. This page is the high-wind structural landing for buyers who searched local extrusion language while specifying fastening and coating for NSCP wind zones.

Wind pressure first—then pick the axis of the 45 × 180

Start from velocity pressure, not from a catalogue page. A common engineering form is q_w = 0.613 × V² with q_w in N/m² and V in m/s. A 250 km/h gust (~69 m/s) is already on the order of 3 kPa before shape factors, exposure and importance multipliers from the National Structural Code of the Philippines (NSCP) are applied. Your frame sketch must state zone, height, and whether the face is open or clad—otherwise a “strong” extrusion quote is theatre.

Orient the 180 mm depth to resist the governing wind moment. About the strong axis this section offers roughly 400 cm⁴ class stiffness at 6.20 kg/m; the weak axis is far softer (order-of-magnitude difference). Ten slots on a 45 mm pitch help you land knee braces, base brackets and cladding rails on T-nuts, but slots do not create moment capacity—bolted connection design does.

What fails first: section, connection, or anchor?

Field failures after Philippine typhoons cluster in three places. Rank them before you argue about alloy temper.

1. Anchor / base plate: undersized chemical anchors in cracked concrete, missing edge distance, or a steel base that yields while the post is still elastic.
2. Post-to-rail joint: single-shear T-nut groups without a gusset; slot walls bearing into oval holes after cyclic load.
3. Member buckling / excessive sway: only after (1) and (2) are competent does the 45 × 180 span table matter.

Tell us whether the base is concrete or steel and the post height. Those two answers change advice more than swapping to a heavier catalogue number. For importer packing and dock QC topics (different intent), see Mumbai arrival inspection; for process choice extrusion vs casting, see Rajkot process decision.

Coastal anodising and length logistics into Manila

Outdoor use: AA20 minimum. Within about 1 km of shore or in salt-spray yards: AA25 sealed to EN ISO 7599, clear or black. Mill finish outdoors in the typhoon belt is a maintenance decision, not a saving. We can supply EN ISO 9227 salt-spray data on request; coating thickness is checked by eddy current to ISO 2360.

Length reality: a 6 m stick of 6.20 kg/m is ~37 kg. Unsupported LCL stowage bows the section over a multi-week Pacific / South China Sea passage. Prefer 3 m and 4 m lengths for LCL into Manila, timber cradled, interleaved, ends protected; 6 m when the container and cradle plan support it end-to-end. Cut to list ±0.5 mm with deburred ends; holes and slots from drawing. Lead time typically 22–32 days after deposit for mill finish, about a week longer for anodising, plus ocean freight to Manila. MOQ 150 m. Trade terms FOB / CIF / EXW.

Acceptance after a typhoon—and at goods-in

Section properties (same physical die family)

Envelope 45 × 180 mm; ten grooves ~10 × 10.2 mm, 10 mm mouth, 45 mm pitch, outermost pair 135 mm apart; 6063-T5; EN 755-9 wall ±0.15 mm; ~6.20 kg/m; mill certificate per heat; RoHS / REACH on request. Process capability includes cut, deburr, drill, tap, notch, anodise, seal, and timber-cradled packing for LCL.

RFQ for Philippine high-wind frames

How to brief a structural engineer using this section

Hand the engineer three packages: (1) NSCP wind inputs and a marked-up elevation showing post height and rail spans; (2) the 45 × 180 property set—mass 6.20 kg/m, strong-axis stiffness on the order of 400 cm⁴, ten slots at 45 mm pitch; (3) connection assumptions—T-nut grade, gusset yes/no, base plate thickness. Without (3), a span check is fiction. GrownParts can cut, drill and anodise to that package; we do not replace the licensed engineer of record for Philippine building permits.

We state manufacturing origin clearly: China extrusion and finishing, exported to Philippine ports. Coastal durability and logistics facts on this page—AA class, LCL-friendly lengths, Manila freight—are written for the buyer, not as a local-plant claim.

Supply package typically includes mill certificate per heat, coating thickness report per lot, salt-spray on request, RoHS/REACH declarations, timber-cradled packing for LCL (or plywood case for cut lengths under 3 m), payment T/T 30/70 or L/C, and samples on request.

Typhoon-belt FAQ