Folding carton material choice
SBS vs FBB: Choosing Board for a Folding Carton
SBS and FBB describe paperboard families used for folding cartons. The useful comparison is between named grades on the same carton: their thickness, stiffness, print surfaces, folding behaviour and product fit. GSM alone does not identify the board or determine the finished pack.
What is the difference between SBS and FBB?
SBS means solid bleached sulphate. Suppliers may also use SBB, solid bleached board, for this area of the market. Bleached chemical pulp is the defining starting point of SBB. FBB generally combines a mechanical or high-yield pulp middle with chemical-pulp outer layers. Coatings and the reverse surface vary with the actual grade. Confirm the mill and product name behind the abbreviation.
Holmen’s paperboard technical guide explains SBB and FBB constructions; its packaging guide also uses SBS terminology. Metsä Board’s FBB explanation shows one producer’s high-yield middle-layer approach. These references explain materials, not the stock or mill grade available for your quotation.
Compare the properties that affect your carton
| Property | What it tells you | What to request |
|---|---|---|
| Grammage | Mass per unit area, usually stated in g/m². | The proposed grade and grammage. |
| Caliper | The board’s thickness. | The supplier’s declared value and agreed tolerance. |
| Stiffness and direction | How the board resists bending in the measured direction. | Relevant grade data and the intended grain orientation. |
| Surface and reverse | The appearance and coating of each face. | Actual board samples and a clear statement of printed surfaces. |
Two boards with the same grammage can have different thickness and behaviour. Put the information beside the same dieline and packed product. This makes a substitution decision more useful than a comparison based only on a trade name or sheet weight.
Review the carton as a converted pack
Start with the actual bottle, jar, pouch or other item, including its cap and primary wrapping. Check usable internal space, panel alignment, flap access and the way the carton is erected and closed. A board sample shows a material; a converted sample shows how that material works in the proposed structure.
Review the artwork and finishing on the nominated surface. Include folds, small text, large colour areas, foil or embossing where specified, and any glue areas. Identify which sample is a structural trial and which is the approved visual reference. The selected production route and tooling need to suit the agreed board.
For manual or automated packing, describe how the carton will be loaded and closed. If a board changes, ask whether the dieline, creasing or gluing setup needs review. Retain the approved grade and revision with the job so a later material substitution is visible.
Ask for comparable quotations
Request both options against one brief: product dimensions, carton style, quantity by artwork, print coverage, finishing and packing method. Ask for the exact proposed board and a description of the sample scope. Separate development or tooling, cartons, inner support, packing and freight where relevant.
State which outcomes matter most: an inside printed face, a clear crease, product support, line packing or a particular visual reference. Let the quote identify what is supplied and what still needs approval. No universal price advantage or minimum grammage follows from the SBS or FBB label.
Questions buyers ask about SBS and FBB
Which board is better for a cosmetic carton?
Compare the actual grades with the product, dieline and decoration. The required appearance, folding, fit and packing process determine the useful choice; the product category alone does not select a grade.
Can the board change while the artwork stays the same?
The artwork may remain usable, but the new surface and construction still need a review of colour, folds, finishing and fit. Record the substitution and the approval reference.
Does a white board establish food-contact suitability?
No. Review the specific board, inks, coatings, contact conditions and supporting documentation for the intended use. A material-family comparison does not approve the complete food pack.