Most people who ask about paper cup raw material are really asking three things at once: what is it called, how heavy should it be, and how much will it cost me per cup. This page answers all three, in the order they matter.
It is not ordinary paper, and it is not cardboard
The material is cup stock board — sometimes sold as cup paper, cup base board, or food board. Three things separate it from the paper you would put in a printer or a shipping box:
1. It is food-contact grade. Nothing in it may migrate into a drink. That rules out recycled fibre in the food-contact layer, most recycled pulps, and any board treated with non-food-grade additives. If a supplier cannot show you a food-contact declaration, the board is not cup stock, whatever the invoice says.
2. It has a barrier coating. A paper cup has to hold liquid for hours without going soft. The coating — not the board — is what does that. See the next section.
3. It is engineered to form and seal. Cup board has to bend into a seam, curl over a rim and hold a bottom seal under heat and pressure, thousands of times an hour, without cracking. Board that is too stiff cracks at the rim; board that is too soft will not hold the shape. This is why you cannot simply buy "thick paper" and expect good cups.
The four specifications that actually matter
① GSM (grammage) — 150 to 380
GSM is grams per square metre: how heavy the board is. Cup machines are built around a working range, and buying outside it is the fastest way to poor cup quality:
| Range | Typical use |
|---|---|
| 150–190 gsm | Small cold cups, tasting cups, low-cost single wall |
| 200–280 gsm | Standard single-wall hot and cold cups (8–16 oz) |
| 280–350 gsm | Premium single-wall, sturdier feel, double-wall inner |
| 350–380 gsm | Heavy premium cups, some bowl applications |
Buying heavier than you need is a permanent cost increase for a benefit customers rarely notice. Going from 280 to 310 gsm is roughly a 10% material increase, every month, forever.
② Coating — PE, double PE, or PLA
- Single PE — one polyethylene layer on the inside. The standard for cold drinks and most hot drinks. Cheapest, easiest to seal, but not compostable.
- Double PE — coated inside and out. Needed where the outer surface must resist condensation, or where you are printing on a coated surface.
- PLA (polylactic acid) — a bio-based coating for compostable cups. It is the growing choice for markets with packaging-waste rules. It also needs a different sealing setup — different temperature windows and often ultrasonic sealing. If you intend to run PLA, say so before the machine is built. It is not a like-for-like paper swap.
③ Sheet width and reel format
Cup machines take board in a specific sheet or reel width. If your local supplier only stocks a width your machine cannot use, you will be trimming waste you already paid for. Confirm the machine's board width tolerance against what your supplier can deliver before you commit to either.
④ Moisture content and stiffness
Two more specifications that never appear on a marketing page but decide your reject rate. Board that has absorbed humidity forms and seals differently from dry board — which is why the same machine, the same moulds and the same operator can produce different results in a monsoon month versus a dry one. Store board sealed and let it acclimatise to the workshop before running it.
How many cups does one kilogram of board make?
This is the calculation that turns a board price into a cup cost, so it is worth doing properly.
Cups per kg = 1,000 ÷ (grams per cup)
Grams per cup depends on cup size — a bigger cup is a bigger blank. As a working reference:
| Cup size | Board per cup (single wall) | Cups per kg |
|---|---|---|
| 8 oz | ≈ 4.1 g | ≈ 240 cups |
| 12 oz | ≈ 5.5 g | ≈ 180 cups |
| 16 oz | ≈ 6.7 g | ≈ 149 cups |
| 12 oz double wall | ≈ 8.5 g | ≈ 117 cups |
So at 12 oz you are looking at roughly 180 cups per kilogram. If your board costs 1.30 per kg, that is about 0.0072 per cup in board alone — before coating, power, labour or moulds. On a two-shift line producing about 2.4 million sellable cups a month, that is the single largest line in your cost sheet.
Double wall is not "a heavier paper"
A common and expensive misunderstanding: double-wall cups are not made from thicker board. They are made from two layers — an inner cup and an outer wrap — which is why a double-wall cup uses 40–70% more board than a single-wall cup of the same size, and why the wrap is often produced on a separate machine.
That has two consequences worth knowing before you buy anything: your board consumption rises well beyond the 10% you might expect, and your line may need a sleeve machine alongside the forming machine to keep up.
What this means for your machine choice
Three practical rules, in order of how much money they save:
1. Fix the paper first, then choose the machine. Find out which board grades are actually available to you, at a stable price, before you choose a machine speed. A 150 pcs/min line running 24 hours consumes on the order of 26 tonnes of board a month — if your supply cannot sustain that, the faster machine is the wrong machine.
2. Check the machine's GSM range against your paper. Every model has a working range. Running board outside it costs you in rejects and in cups that fail in the customer's hand.
3. Decide PE or PLA before you order. Compostable coating is a specification, not an accessory. Retrofitting a PE line to seal PLA reliably is far more expensive than specifying it at the factory.
Work out your own numbers
Board is usually the largest single cost line in a paper cup — typically the majority of the cost per cup. Enter your own local board price, coating cost and cup size into our calculator rather than trusting anyone's example, including ours:
→ Paper Cup Manufacturing Cost Calculator
And if you want to know which of our machines suits the board you can actually buy, send us the specification — gsm, coating, sheet width, cup sizes:
