Specialty Paperboard & Packaging Substrates
Folding boxboard, SBS, CUK and recycled board for cartons, cups and trays: grades, stiffness and caliper, barrier coatings, food contact and converting trials.
Buyer summary
- What it is
- Paperboard grades (SBS, folding boxboard, coated unbleached kraft, recycled board) for printed cartons, cups, trays, cards and boxes, often with barrier coatings.
- Main applications
- Food, confectionery, frozen and chilled goods, pharmaceutical, cosmetic and consumer cartons; cups and food-service packaging; trays; blister cards; multipacks; rigid boxes.
- Critical purchasing specifications
- Grade family and ply structure
- Basis weight, caliper and stiffness by direction (TAPPI T 489)
- Print surface, brightness and finishing requirements
- Barrier or coating type and its recyclability
- Food-contact compliance for board and coatings (for example 21 CFR 176.170)
- Qualification considerations
- Qualify on your press, folder-gluer and filling line, because crease, fold and glue behaviour depend on the board and the line together.
- First step
- Describe the pack, the product, the print and converting route, and the end-of-life target.
- How PAXOMER can assist
- Paperboard is qualified on your press, converting line and pack. PAXOMER can help define grade, stiffness, surface, barrier and compliance requirements, identify board mills with suitable grades, and coordinate trial sheets or reels. Manufacturer-level discussions on sizes and annual tonnage can follow. Manufacturer identification, qualification support and pricing discussions depend on manufacturer confirmation, specifications, quantities and terms.
Detailed technical guidance, data tables, FAQs and technical references follow below.
Food-contact and claim documentation. Food-contact suitability and environmental or recycled-content claims depend on the exact material, use and market. Request written documentation; this page confirms none.
General technical information published by PAXOMER Inc. to support preliminary material evaluation. It is compiled from the sources cited on this page and has not been independently reviewed or certified by a professional engineer, laboratory or certification body. Values marked typical, illustrative or requiring confirmation are not specifications. Confirm properties, standard editions, regulatory status and suitability for your specific application with the manufacturer and, where the use is regulated or safety-related, with a qualified professional or the relevant authority.
Specialty paperboard is the substrate of folding cartons, cups, food trays, blister cards, sleeves and rigid boxes. The main grades are solid bleached board (SBS), folding boxboard (FBB), coated unbleached kraft (CUK) and white-lined chipboard or recycled board (WLC). Many are coated or laminated with barrier layers for food contact, moisture or grease resistance. Buyers specify them by grade, basis weight and caliper, stiffness, brightness and print surface, ply bond, and compliance for the intended contact.
This page is for packaging engineers, carton converters, cup and tray makers and brand buyers. It explains the grades, the properties that decide printing, converting and pack performance, the test methods that appear in specifications, and how to trial a new board. It is separate from corrugated containers, which are covered in the corrugated and cartons guide. It does not state that PAXOMER stocks or has qualified any board, and its tables are frameworks unless a value is attributed to a source.
A. Product identity and terminology
1. What is specialty paperboard?
Paperboard is thick, stiff paper made in one or more plies, often with a coated top surface for printing. "Specialty" here means grades and finishes chosen for a particular package: printed folding cartons, cup stock, food-service trays, blister and skin cards, liquid-packaging board and luxury rigid boxes. The grade, coating and any barrier treatment are selected for the pack's printing, converting, protection and end-of-life needs.
2. Which grades are used?
| Grade | Typical use | Points to evaluate |
|---|---|---|
| Solid bleached board (SBS, GZ) | Premium cartons, cups, pharmaceutical and cosmetic packs | Surface, purity, stiffness per weight |
| Folding boxboard (FBB, GC1/GC2) | Food, confectionery, healthcare and consumer cartons | Stiffness at lower weight, ply structure, odour and taint |
| Coated unbleached kraft (CUK, SUS) | Beverage multipacks, frozen food, strength-critical packs | Wet strength, tear, printing surface |
| White-lined chipboard (WLC, GD/GT) | Cost-driven dry-goods cartons | Recycled content, stiffness, contaminant control |
| Barrier-coated boards | Cups, trays, liquid and fatty-food packs | Coating type, heat-seal, recyclability |
3. Which terms appear in specifications?
Basis weight (grammage, g/m²), caliper (µm or points), bulk, bending resistance (Taber stiffness), brightness and whiteness, gloss, smoothness or roughness, ply bond (internal bond), Cobb (water absorption), moisture content, curl, compression (for trays), coating weight, GC1/GC2/GD/GT grade codes, food-contact and odour/taint testing.
4. Who buys paperboard?
Folding-carton converters, cup and food-service manufacturers, tray and container makers, blister and skin-pack producers, rigid-box makers and brand owners in food, beverage, healthcare, cosmetics, tobacco, consumer electronics and household goods. Brand owners often specify the grade; converters qualify the board on their equipment.
B. Properties and performance
5. Which properties matter most?
Stiffness for carton performance on filling lines and on shelf; caliper and basis weight for yield and dimensions; surface smoothness and brightness for print quality; ply bond for creasing and glueing without delamination; moisture and curl for sheet-fed printing and folding; and barrier properties for the product packed. Stiffness rises steeply with caliper, which is why multi-layer FBB can reach a target stiffness at lower weight than some other grades.
Paperboard parameters to specify
Framework only. Values are grade-specific and must be stated by the board manufacturer and confirmed on your press and converting line.
| Property | Value or range | Unit | Test conditions | Test method | Grade or construction | Source | Verification status |
|---|---|---|---|---|---|---|---|
| Basis weight | per grade | g/m² | Nominal and tolerance stated | Grammage test | Paperboard | None | Manufacturer confirmation required |
| Caliper | per grade | µm | Nominal and tolerance stated | Thickness test | Paperboard | None | Manufacturer confirmation required |
| Bending resistance (stiffness) | per grade | mN·m or Taber units | Direction (MD/CD) stated | TAPPI T 489 (S1) | Paperboard | S1 | Manufacturer confirmation required |
| Brightness or whiteness | per grade | % or index | Method and illuminant stated | Optical test | Coated surface | None | Manufacturer confirmation required |
| Ply bond | per grade | J/m² or as agreed | Method stated | Internal bond test | Multi-ply board | None | Manufacturer confirmation required |
| Moisture content | per grade | % | At delivery | Moisture test | Paperboard | None | Manufacturer confirmation required |
6. How are barrier properties added?
Barrier is added by extrusion coating (for example polyethylene), dispersion or water-based coatings, laminated films or foils, or fluorine-free grease-resistant treatments. Each coating changes heat-seal behaviour, resistance to moisture and grease, food-contact compliance and recyclability. Barrier must be measured on the coated board and finished pack under the conditions of use.
7. What decides print quality?
Coating layers, smoothness, gloss, absorbency and surface strength determine how offset, flexographic, gravure or digital inks behave. Some boards are designed for specific finishing such as hot-foil stamping, embossing, varnishing or lamination. Print trials on your press, with your inks, are the reliable check.
C. Manufacturing and processing
8. How is paperboard made?
Board is formed on multi-ply machines from separate pulp furnishes for top, middle and back plies, pressed and dried, then coated, calendered and wound into reels. Grade structure comes from the furnish in each ply: bleached chemical pulp, mechanical or chemithermomechanical pulp, unbleached kraft or recycled fibre. Reels are sheeted or slit for converting.
9. Which converting steps use paperboard?
Printing, varnishing and coating; cutting and creasing; folding and glueing for cartons; forming and sealing for cups and trays; lamination to films or foils; and window patching. Each step tests stiffness, crease and fold behaviour, ply bond, glue adhesion and dimensional stability.
10. Which problems are common?
| Problem | Possible causes | First checks |
|---|---|---|
| Cracking at creases | Low moisture, brittle coating, wrong crease tooling | Moisture; crease rule and channel; grain direction |
| Delamination | Low ply bond, excessive creasing force | Ply bond; tooling |
| Curl and sheet-feeding problems | Moisture imbalance, storage | Conditioning; storage humidity |
| Poor glue bonds | Coating or varnish on glue flap, wrong adhesive | Glue-flap masking; adhesive |
| Cartons bulge or fail on line | Insufficient stiffness, wrong grain direction | Stiffness in the right direction; carton design |
| Odour or taint | Board, coating or ink | Odour and taint tests; component review |
11. How should paperboard be stored?
Keep reels and pallets wrapped until use, store at stable temperature and humidity, and condition board to the pressroom climate before printing. Protect against moisture pick-up and edge damage. Rotate stock and keep lots traceable.
D. Applications and qualification
12. Where is specialty paperboard used?
Folding cartons for food, confectionery, frozen and chilled goods, pharmaceuticals, cosmetics and consumer goods; cups and food-service packaging; trays and ovenable containers; blister and skin cards; beverage multipacks; liquid-packaging board; and luxury rigid boxes.
13. Which requirements depend on the application?
Direct food contact needs compliance documentation for the board and coatings in the target market; in the US, 21 CFR 176.170 covers paper and paperboard components in contact with aqueous and fatty foods (S3). Pharmaceutical cartons may need specific print and colour control; recycled-fibre boards in food contact need contaminant control and evidence. Define the use and market before comparing grades.
14. What sustainability questions arise?
Questions include fibre source and certification, recycled content and its basis, coating recyclability in the target collection system, compostability claims for coated boards, and grease-resistance chemistry (for example avoiding fluorinated treatments). Claims printed on packs must match the documented basis for the exact board.
15. How should a buyer select candidates?
- Define the pack, product, filling line and end-of-life target.
- Fix grade family, stiffness target, caliper range, print surface and barrier needs.
- Ask mills for grades with data sheets and compliance documents.
- Run print and converting trials, then pack and line tests.
- Choose on pack performance, yield, documentation and total cost.
16. How should a board trial be run?
Print trial sheets or reels on your press with production inks and finishing, cut and crease with production tooling, fold and glue on the folder-gluer, then run cartons on the filling line. Measure stiffness and caliper on incoming board, record crease cracking, glue failures and line jams, and compare with the incumbent.
17. Which documents should be requested?
Grade data sheet with methods; food-contact compliance statements for board and coatings with scope; fibre-source and recycled-content documentation; odour and taint data where relevant; storage guidance; certificates per lot where specified; and change-notification commitments.
E. Procurement, comparisons and decisions
18. How do the main grades compare?
| Grade | Where it may be preferred | Trade-offs to evaluate |
|---|---|---|
| SBS | Premium print, purity-sensitive packs | Weight for a given stiffness |
| FBB | Stiff cartons at lower weight | Ply structure, odour and taint for some uses |
| CUK | Strength and moisture resistance | Brown back, print surface |
| WLC / recycled | Cost-driven dry goods | Contaminant control for food contact |
19. How should cost be compared?
Compare cost per good carton: board price per tonne converted to cartons per tonne (yield depends on basis weight), plus print, converting and line waste. A lighter board with equal stiffness can reduce cost per carton if converting and line performance hold.
20. What should a paperboard RFQ include?
- Pack type, product and end use (including food contact).
- Grade family, basis weight or caliper range and stiffness target.
- Print process, finishing and surface requirements.
- Barrier or coating requirements.
- Sheet or reel sizes, grain direction and annual tonnage.
- Compliance and sustainability documentation needed.
Prepare and submit these through the RFQ brief.
21. Which manufacturer qualification questions should be asked?
Grade range and machine capability; quality control and certificates; food-contact compliance support; fibre certification; technical service for print and converting; manufacturing locations; and change control for furnish, coating or mill changes. PAXOMER does not confirm any manufacturer's capabilities on this page.
22. Which related pages should be read next?
- Guide: Corrugated boxes, cartons and packaging paper
- Related page: Molded fiber packaging
- Related page: Flexible packaging inks and functional coatings
Manufacturing Regions & International Supply
No country-level manufacturing evidence specific to Specialty Paperboard & Packaging Substrates was confirmed in the review.
- No mill source documenting specialty-paperboard production in a reviewed country could be retrieved for verification on 30 October 2026. Trade and market-research references to Asian folding-boxboard producers are not listed.
If you are evaluating manufacturers abroad, list in your RFQ brief the destination market, the documents you require and the delivery terms.
Engineering and purchasing FAQs
Each answer is general technical information, not a specification or a quotation.
What is the difference between SBS and FBB?
SBS is made from bleached chemical pulp throughout; FBB is multi-layer, often with mechanical or recycled middle plies between virgin outer layers, giving high stiffness for its weight.
Why do my cartons crack at the folds?
Common causes are low board moisture, brittle coatings or unsuitable crease tooling. Check moisture and the crease rule and channel before changing board.
How is paperboard stiffness measured?
Often with a Taber-type bending tester according to TAPPI T 489, in machine and cross directions.
Is recycled board suitable for food contact?
Only with documented compliance for the exact grade and use in the target market, including contaminant control.
Can a coated board still be recycled?
It depends on the coating and the local recycling system. Ask for recyclability assessments for the exact coated grade.
Can PAXOMER supply paperboard?
This page does not confirm supply. Send the pack, grade requirements and volumes, and PAXOMER will review whether a suitable manufacturer-development opportunity exists.
Technical References
References below were opened on the access date shown. A source supports only the statement it is cited for. Standards are cited by number and title from public catalogue entries; their full text was not read unless stated.
- S1. TAPPI/ANSI T 489 om-22 — Bending resistance (stiffness) of paper and paperboard (Taber-type tester in basic configuration). TAPPI, 2022. imisrise.tappi.org/TAPPI/Products/01/T/0104T489.aspx (opens in a new tab) standard catalogue · accessed 2026-10-30
Catalogue entry opened 2026-10-30 to confirm title, edition and scope. Test details were not read. - S2. Boosting sustainability and your bottom line with folding boxboard. Packaging Strategies (I. Lifshitz), 2018-05. packagingstrategies.com/articles/90445-boosting-sustainability-and-your-bottom-l (opens in a new tab) technical literature · accessed 2026-10-30
Article opened 2026-10-30; cited for FBB as a multi-layer board that can have recycled fibres between virgin-fibre outer layers, and as most prevalent in European and Asian markets. - S3. 21 CFR 176.170 — Components of paper and paperboard in contact with aqueous and fatty foods. US Government Publishing Office / eCFR. www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-176/subpart-B/section- (opens in a new tab) regulatory · accessed 2026-10-30
Regulation page opened 2026-10-30 to confirm title; text not summarised. - S4. Corrugated boxes, cartons and packaging paper (PAXOMER guide). PAXOMER Inc., 2026-10-30. /products/corrugated-boxes-cartons-packaging-paper/ technical literature · accessed 2026-10-30
PAXOMER’s own guide; not an external source and not independently reviewed.
Evidence notes and limitations
What the information on this page does not establish. Confirm these points with the manufacturer, the current standard or the relevant authority before relying on them.
- Grade descriptions (SBS, CUK, WLC), property relationships and converting problems are general industry practice and not supported line by line by a recorded source.
- Other markets' food-contact rules for paperboard are referred to generically; none was read for this page.
- This page has not been independently technically reviewed or certified.
Facts checked against the cited sources
- TAPPI T 489 om-22, the Packaging Strategies article and 21 CFR 176.170 were opened on 2026-10-30; the statements attributed to them were confirmed.
Where this connects to the full guide
The primary technical guide behind this page is Corrugated Boxes, Cartons & Packaging Paper. All its topics are indexed below.
Topics in the full guide
- Quick answer
- What does this material system do in an industrial application?
- What do the product names and technical terms mean?
- What product types and classifications are available?
- How does material composition affect performance?
- How is the material manufactured and converted?
- Which technical properties affect application performance?
- Which grades, dimensions and specifications should buyers compare?
- Where is this material used in industry?
- Which requirements depend on the intended application?
See all 35 topics in the guide
Related guides, comparisons and tools
Glossary: Linerboard · Fluting medium · Edge-crush test · Box compression test
Tools: Product Finder · Manufacturer Finder
How can I submit an inquiry?
Describe your application, the specifications above and the qualification stage. The material and this page are carried into the form for you. PAXOMER replies by email; the form does not confirm stock, representation or qualification.