Material selection · RFQ guide
How to specify pre-painted aluminum coil for roofing and gutters
A useful RFQ describes the finished component, forming equipment, base metal and surface system. This guide separates the information a buyer can provide from details that must be confirmed in a written quotation.
Begin with the finished component
“Roofing coil” and “gutter coil” are application descriptions, not complete material specifications. For roofing, tell the supplier whether the coil will become standing-seam panels, flashing or another roll-formed part. For gutters, identify the seamless gutter machine and the intended gutter or downpipe profile. If a drawing, profile section or approved sample exists, include it in the RFQ. This gives the supplier a basis for discussing the feed width, forming route and coil geometry.
Puyu Aluminum has separate pages for pre-painted aluminum roofing coil and painted aluminum gutter coil. Use the relevant page to start the conversation, then describe the actual project instead of assuming a listed configuration fits every machine.
Define the base metal and dimensions
State the requested alloy and temper if your drawing or production process requires them. The roofing page discusses 3003 and 3004, while the gutter page discusses 3003 and 3105. These are product-page inquiry routes; availability of a specific alloy, temper and thickness combination is confirmed for each order.
Give the required metal thickness separately from any overall coated thickness. Specify whether a width is the incoming parent coil width or the slit feed width. If the finished part is cut to length, provide the cutting dimensions and tolerance basis. State the coil inside diameter, any outside-diameter limit, maximum acceptable coil weight and the feeding direction required by your equipment. These details help prevent a technically suitable surface from arriving in a coil format your line cannot run.
Describe the surface system
Name the coating system requested by your project, such as PE, PVDF or another finish that needs review. Include color reference, desired gloss or texture, coating side or sides, and whether temporary surface protection is needed. If color must match an existing installation, provide a physical sample or an agreed reference and define the acceptance method before production. The coating route, color and inspection criteria should appear in the written order specification.
Environmental exposure and downstream forming can change what the buyer needs from a finish. Tell the supplier where the component will be used and whether the coil will be bent, profiled, embossed or otherwise processed after delivery. Do not treat a coating name alone as a performance guarantee; agree the relevant acceptance criteria and supporting documents for the actual project.
Agree on inspection, packing and commercial terms
List the dimensional, appearance and coating checks your team requires. If a standard, test method or certificate is mandatory for your contract, name its exact edition and the required document rather than assuming it is included. Ask how an approved sample or color reference will be handled when repeat orders are planned.
For international delivery, include order quantity, destination country and port, preferred Incoterm, target schedule and any packing limits. The quoted price depends on the approved specification, quantity and delivery basis. A published starting price is a guide to a standard configuration; the written quotation governs the actual order.
RFQ checklist
Use this table to separate your inputs from the items to confirm before placing an order.
| Field | What the buyer should send | What to confirm in writing |
|---|---|---|
| End use | Finished roofing, gutter or downpipe component; drawing or sample | Agreed application and forming route |
| Equipment | Forming-machine model or feed limits | Slit feed width and coil geometry |
| Base metal | Requested alloy, temper and metal thickness | Available combination and tolerance basis |
| Surface | Coating type, color reference, gloss and coating sides | Approved finish, sample route and acceptance criteria |
| Dimensions | Parent/slit width, cut length if relevant, coil ID/OD and weight limits | Production dimensions and packing unit |
| Quality documents | Contract standard, required inspection or certificate | Agreed test and document scope |
| Commercial | Quantity, destination, Incoterm and target schedule | Price basis, lead time and shipping terms |
A practical way to send the first inquiry
Send the product application and a drawing or sample first. Add known alloy, thickness, width and coating requirements, then mark unknown fields as “to be confirmed” instead of guessing. Include the forming-machine limits and delivery destination. A supplier can then identify what needs clarification and prepare a specification-led quotation.
For a roofing project, begin with the roofing coil page. For gutters or downpipes, begin with the gutter coil page.
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