Strength method
32 ECT or 275 lb
Example language from industry key specs: 32 ECT single-wall RSC, or 275 lb burst double-wall. Keep the method the plant tests. Do not convert one number into the other.
wholesale corrugated boxes
Wholesale corrugated boxes still need an open specification closed before a comparable factory quote. This page is a material-evidence checklist: virgin kraft versus post-consumer recycled content, flute choice, ECT versus burst, and when a paper mailer is not a plastic mailer. It is not an environmental scorecard and it does not claim site-wide mill certifications.
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Decision sequence before you accept an alternative
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1 Board and liner
Freeze paperboard caliper or liner basis. If a plant swaps a PCR liner, ask for the same caliper and a new edge crush test or burst record. Recycled fiber can change ring crush and appearance even when flute letters stay the same.
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2 Flute profile
B-flute, C-flute and BC double-wall print and crush differently. A print-heavy mailer often stays on a finer flute; a heavy spare-parts pack often needs a taller flute or a second wall. Do not accept a silent flute swap on a frozen die line.
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3 Print path
Flexographic printing on a long, stable artwork versus digital print on short, changing SKUs. Plate cost, spot-color control and kraft show-through belong on the quote, not in a verbal "close enough".
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4 Claim files
FSC chain-of-custody, GRS, or food-contact statements attach to a named mill and lot. If the alternative construction lacks the file you already required, it is not the same offer.
Specification cards to copy onto the RFQ
Flute letters
B / C / BC
Write the flute profile on every line. A BC double-wall is a different construction from a single-wall C, including cube and freight.
Recycled claim
PCR file
Post-consumer recycled content is a percentage the mill must declare for that liner. This page does not invent a PCR number for the site.
Mono-material thinking versus a plastic mailer
Some buyers want a paper-only shipper so recycling reporting stays on a fiber stream. A polyethylene mailer can cut water-vapor load or puncture in wet last-mile routes. Those are opposing briefs. If the product is aroma-sensitive or needs a barrier web, corrugated alone may not be the primary pack; the box then becomes a master or shipper and the barrier file sits on another material. Glass-versus-plastic debates belong to bottles, not to this family, except when a glass jar's weight forces a higher flute or a pad.
Documents to request from the named mill
The tiles below are request types, not logos this service owns.
Board file
Caliper, liner basis, flute, and the edge crush test or burst method used on that board.
Print system note
Ink type, coating and, if food-adjacent, migration testing for that ink and adhesive set.
Chain-of-custody
FSC or GRS only when the mill file matches the quoted lot. Absence of a file is a no-claim state.
Sample path
Structural sample or printed proof on the quoted board. A white mock-up is a different substrate.
Open items that block a comparable wholesale reply
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Fields that must match across plants: style, dimensions, flute, strength method, print count.
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Cost lines to keep visible: piece, tooling, freight to the named destination.
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Published savings percentages on this site. Compare total cost after those lines exist.
If an alternative construction still has a blank flute, a missing board file, or an unverified PCR sentence, do not accept it as a substitute. Return to inquiry options or send the procurement form.
Close the material questions, then request quotes
Optional budget and high-end, mid-range, budget or undecided preference are buyer selections, not mill ratings.
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