What is C1S Folding Box Board?
C1S Folding Box Board (also known as FBB, or Single-Side Coated White Cardboard in China) is a paperboard with a coated printing surface on one side and a smooth uncoated reverse side. It is one of the most common substrates for folding cartons, cards and light packaging in the world.
What does C1S mean?
C1S = Coated One Side. One side of the board receives a coating layer that gives a smooth, bright, ink-friendly surface for high-quality printing (offset, UV, foil stamping), while the reverse side stays uncoated — ideal for printing a single colour, writing on, or leaving plain.
What does FBB mean?
FBB = Folding Box Board. In the international paper grading system, FBB is a multi-ply board with a white coated top layer, suitable for creasing and folding into boxes and cartons. Chinese mills produce FBB in two common forms:
- C1S (Coated One Side) / FBB-1 — premium grade, 170–400 gsm across 12 grammage points, with laser-coding capability for pharmaceutical cartons.
- C1S (Coated One Side) / FBB-2 — 190–400 gsm across 8 grammage points, optimised for offset printing, UV and foil stamping.
Typical technical parameters
| Grammage | 170 – 400 g/m² (12 grades) |
|---|---|
| Brightness (face) | 88 – 91% ISO |
| Thickness | 205 – 555 μm |
| Taber Stiffness MD | 2.0 – 32.6 mN·m |
| Cobb (60 s) | ≤ 55 – 60 g/m² |
| Internal Bond | ≥ 130 J/m² |
What is C1S board used for?
- Pharmaceutical cartons (grades ≥ 250 gsm support laser coding of production date / batch number)
- Cosmetics and personal-care packaging
- Food packaging cartons (tea, confectionery, takeaway boxes)
- Book covers, calendars, greeting cards and business cards
- Apparel hang tags and shopping bag inserts
How to choose the right grade?
- Pharma / laser coding → choose FBB-1 at ≥ 250 gsm
- Low-grammage cards (170–210 gsm) → both grades are fine and print well on both sides
- Offset / UV / hot-foil printing → FBB-2 is tuned for these processes
- Custom sizes → both grades are available as jumbo rolls or sheets, with slitting, rewinding, mounting and film lamination services
Need a quote for C1S folding box board?
We supply both FBB-1 and FBB-2 with full technical data, samples and custom converting. Replies within 24 hours.
Request a QuoteView the White Cardboard Series