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SBS C1S paperboard — brands, makers and what actually differs between them

There's a surprising amount of product variety under the generic label SBS C1S (Solid Bleached Sulfate, coated one side). Below I'll pull together the main global mill brands you'll see, what makes each different (color/brightness, typical weights/thickness, surface/coating and finishing options), plus a short note on where lesser/commodity grades come from.

Quick Primer: What "SBS C1S" Means

  • SBS = Solid Bleached Sulfate (aka SBB in some regions) — a virgin-fiber, chemically pulped, bright white paperboard.
  • C1S = Coated on one side (the printing face is coated; the back is uncoated or lightly finished). This gives a bright, smooth face for high-quality printing while leaving the inside/back more porous for gluing and finishing.

Major Mill Brands You'll Commonly Encounter

Listed as brand → mill / owner → high-value features (brightness/colour, typical caliper/grammage, finishes/coatings).

Candesce® — Clearwater Paper

Clearwater markets Candesce as a renewable SBS board aimed at premium packaging. Typically positioned for cosmetics and consumer goods with consistent printability and strength.

Tango® — WestRock / Smurfit WestRock

Tango C1S is a widely distributed commercial SBS C1S grade sold through WestRock/Smurfit channels. Known for good runnability and consistent printability; available in typical cover weights for folding cartons and digital runs (roughly 10–18 pt / 250–350+ gsm ranges).

Crescendo® — Smurfit / WestRock Portfolio

Positioned as a premium coated paperboard for brand packaging; emphasizes a bright, clean white surface and fade-resistant coatings. Available as C1S and C2S depending on product.

Invercote® (Invercote G, etc.) — Iggesund

High-end triple/coated surfaces (very smooth), used for prestige packaging. Very high brightness/whiteness and excellent lamination and foil performance. Available in thicker calipers for luxury boxes.

Ensocoat™ / Ensovelvet — Stora Enso

Ensocoat is Stora Enso's coated SBS family (smooth, "icy-white" surface) for luxury packaging. Ensovelvet (a newer uncoated, velvet-feel option) shows how mills differentiate by surface tactile quality.

Proto / Other SBS Boards — Sappi

Sappi supplies SBS/SBB C1S grades (Proto C1S and others) for everyday and premium packaging, with good availability in North America and EMEA.

Diva Art / Diva Art Metal — Lecta

SBS one-side coated with silk or metallized surfaces for creative and luxury packaging. Emphasizes cracking resistance and folding performance.

CrownBoard / Voyager / Productolith, etc. — Billerud (BillerudKorsnäs)

Billerud's cartonboard lines include SBS and premium CrownBoard variants — positioned for strength plus high whiteness, targeted at health/beauty and high-end FMCG packaging.

Everest / Other Mill/Packer Names — Graphic Packaging, Various Converters

Converters and packaging companies also brand SBS C1S products (Everest, Everest Folding Carton Board, etc.) — packaging-oriented product names used for converters' stock.

Also common: numerous regional mills and converters (Metsä Board, Lecta, Moorim, APP, Verso, Neenah, etc.) make SBS/FBB-type boards or similar folding boxboards with their own trade names and tweaks (lighter caliper variants, high-bulks, metallized versions, digital-optimized grades).

What Actually Differs Between Brands

1. Colour / Whiteness / "Shade"

Metric: ISO brightness and visual whiteness. Premium SBS mills promote very high brightness (often low 90s ISO brightness or higher) and a blue-white or "icy" shade for strong color contrast and neutral whites. Lower grades or commodity imports may be slightly less bright (mid-80s to high-80s). Brands like Invercote, Candesce and some premium mill lines are intentionally brighter/whiter for luxury packaging.

2. Coating Type & Coat Weight

Coating mineral: kaolin clay or pigment coatings on the print face (single coating for C1S; some products use multiple pigment layers for extra smoothness). Triple-coat or double-coat surfaces (e.g., triple-coated Invercote G) reproduce finer detail and handle foil and lamination better.

3. Surface Finish

Gloss / silk / matte / velvet / non-glare: Many brands offer gloss, semi-gloss, silk (soft satin) or specialty textured/uncoated faces (e.g., Ensovelvet). Finish determines visual appearance, how inks sit, and suitability for finishing such as foil and emboss.

4. Thickness / Caliper & Basis Weight

Typical ranges: SBS C1S is made across a wide range. Common packaging calipers/weights (approximate):

  • Light folding board / digital substrates: ~170–250 gsm (≈7–10 pt)
  • Standard folding carton: ~250–350 gsm (≈10–14 pt)
  • Heavy/luxury cartons, rigid sleeves: 350–450 gsm (≈16–24 pt) or thicker

Mills and distributors publish pt and gsm equivalents; a comparative basis-weight table shows how the same nominal pt can vary slightly between mills because of formulation.

5. Bulk (Caliper per gsm) & Stiffness

High-bulk boards give more perceived thickness at lower gsm — good for a rigid look without the weight. Some mills formulate for higher bulk or higher stiffness depending on pulp mix. This affects box rigidity and feel.

6. Crack Resistance & Convertibility

Some grades are specially formulated to resist cracking on folds (important for deep boxes and heavy graphic finishes) — Lecta's Diva Art and similar "folding"-focused boards emphasize this property.

7. Food/Food-Contact Variants and Barrier Options

SBS can be poly-lined or coated with a thin PE layer for moisture and food safety. Some mill lines specify food-grade supply or barrier variants suitable for chocolates, frozen foods, etc. If you need this, confirm the exact food-contact certification with the supplier.

Typical Numeric Ranges on Spec Sheets (Summary)

  • Brightness / whiteness: ~87 → 95 (mid-80s = lower commodity; 90+ = premium "blue-white" mills).
  • GSM: ~170 g/m² up to 450+ g/m² (common packaging 250–350 g/m²).
  • Caliper / pt: ~7 pt up to 24+ pt depending on grade; note pt ↔ gsm conversions vary by mill.

Where Candesce, Holmen and Tango Fit In (and Similar Peers)

  • Candesce (Clearwater) — premium SBS positioning for North America.
  • Tango (WestRock / Smurfit networks) — widely available commercial C1S for print/pack markets (digital & litho).
  • Holmen — Holmen Board (Nordic producer) produces premium white boards known for very bright, white surfaces and specialty coated faces, often sold into luxury packaging lines.

If you're already familiar with those three, their nearest peers are Invercote (Iggesund), Ensocoat (Stora Enso), CrownBoard (Billerud), Sappi Proto, Lecta Diva Art, and converters' branded lines (Everest, Productolith, etc.). Each differentiates mainly via surface treatment, whiteness, and bulk/stiffness profile.

Where Commodity "Off-Brand" C1S Comes From

A large volume of C1S comes from regional mills and Asian manufacturers (custom FBB/SBS in China and Korea) and from converters who rebrand it as stock sheets. These are typically lower cost and may have lower brightness, different bulk, and fewer finishing guarantees. If you need high consistency (color match, foil stamping, low crack), prefer mill-branded premium SBS.

Practical Advice — How to Pick the Right SBS C1S for Packaging

  1. Decide by end use, not just brand. If you need a luxury look plus foil and lamination, choose a triple-coated, high-whiteness board (Invercote, Billerud CrownBoard, Candesce, Ensocoat). If you need economy plus good print, Tango or standard mill SBS works well.
  2. Specify the exact metrics you need: brightness (ISO), coating type (single/double/triple pigment), finish (gloss/silk/matte), gsm or pt, caliper/bulk, and crack resistance. Don't accept "C1S" alone.
  3. Ask for technical datasheets and converting guidelines. They list cracking resistance, recommended crease scores, and caliper vs. gsm conversions (these vary by mill).
  4. If food contact is required, ask explicitly about PE liners, food-grade certifications, and migration test data.

Quick Reference of Useful Mill/Product Pages (Start Here)

  • WestRock / Tango product guide (Tango C1S)
  • Clearwater Paper — Candesce product info
  • Iggesund — Invercote product family (high-end C1S options)
  • Stora Enso — Ensocoat / Ensovelvet specs
  • Sappi — Proto C1S and paperboard portfolio
  • Lecta — Diva Art (silk and metallized C1S variants)
  • Billerud (CrownBoard / Voyager / Productolith)

Final Takeaways

"SBS C1S" is a useful umbrella, but it hides big differences. The practical differences between brands are surface/coating (single vs. multi-coat), finish (gloss/silk/matte/velvet), brightness/shade, bulk/stiffness, and convertibility / crack resistance. Premium mill brands invest in whiter "blue-white" pulps and heavier/multi-layer coatings (Invercote, Candesce, Billerud, Ensocoat), while larger commercial lines (Tango, Crescendo, Sappi Proto) balance cost and runnability.

Schedule a Consultation

Choosing the right substrate is only half the job — profiling and proofing it correctly is the other half. Contact Bill Owen to get your color dialed in across any SBS C1S board.
billo@aldertech.com — 720-933-4413

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