French door frame profile: what it is and how to buy it

A door frame is a cold-roll-formed section, and the Iranian market knows three of them: French, Roman and plain, the French section being the most widely used. The 507, 508 and 509 door and window profiles are close relatives and usually run on the same line. Evaluate technical specifications, the price basis, delivery terms and quality evidence together. A lower number is not a comparable offer if it covers a different grade, weight, coating or delivery scope.[1][2]

Iranian buyers order this section by trade name rather than by a dimensional standard: French, Roman and plain describe the fold, and no national weight table covers any of them. Each producer states its own bar weight, and published merchant lists put a 6.6 m bar in 2 mm somewhere between 24 and 26 kg. An export buyer should treat bar weight and actual bar length as part of the specification, agree the currency and the delivery point, and compare a price per kilogram only where the same seller has written both figures beside it.

A cold-rolled strip is folded on a roll-forming line and its seam is welded; strip width, fold pattern and sheet thickness decide how many kilograms each metre weighs. Because the product sells by the kilogram, a small change in thickness or strip width lands directly on the weight and the price of a bar: two bars under one trade name with two different weights are two different goods.[2][3]

Compare on section type, sheet thickness, bar length, weight per bar and price per kilogram, and take all five figures from one seller for one date. Compare offers only after aligning units, the weight basis, taxes, packaging, loading, freight and quote validity. An omitted cost can outweigh the apparent saving per kilogram. Keep the supplier’s currency and payment date visible before converting to your purchasing currency.

Ask every supplier to answer the same written specification. This prevents an apparently cheaper offer from silently changing the product or scope. Confirm the following before comparing prices:

Use this table to structure the decision. It does not replace engineering calculations or the contract. The final column identifies the evidence to review before accepting an offer.

The table below comes from what each producer publishes itself, not from a merchant's page. Kian Persia and Hirbod Zarandieh both issue a factory product list, and the frame appears on those lists. Other names circulate in the market as producers of this section, but until the factory's own list is in hand, a similar name is no proof of the same company; the producer's full name belongs on the proforma and on the bill of lading.

Neither of these mills prints a bar weight on its list, and the merchant lists do not agree on one figure either: for a 6.6 m bar in 2 mm the published numbers run between 24 and 26 kg, and in 2.5 mm between 30 and 31 kg. That spread of about eight percent, across a full load, is larger than what you are negotiating over the price per kilogram. Ask for the bar weight from the same seller who quoted the price.

Errors often begin when a trade name replaces a technical specification, one photograph stands for an entire shipment, or the delivery scope is missing from the quote. Address these specific risks: Accepting the word frame without a section type; Comparing prices per kilogram without a bar weight; Swapping 2 mm and 2.5 mm sheet; Treating 6 m and 6.6 m bars as equal. Turn each risk into a written acceptance criterion, sampling requirement or traceable document.

A standard number alone does not demonstrate conformity. Specify the edition, grade, dimensions, tolerances, test method, heat or batch number and acceptance authority. For an import project, confirm the destination’s requirements and the project’s approved specification; an Iranian market designation is not automatic evidence of an equivalent local grade.

Do not buy a frame by name. Put the section type, sheet thickness, bar length and stated bar weight on the proforma, and compare price per kilogram only once those four figures match.[2][3]

Before ordering, prepare a single comparison sheet covering the product, quantity, unit, theoretical and actual weight, base price, taxes, freight, delivery window, documents and acceptance criteria. Identify who pays each cost and who records discrepancies at receipt. This makes the negotiation clearer and gives the receiving team an agreed basis for checking the shipment.