What Paper Is Used to Make Paper Cups?
Paper cups are everywhere-from coffee shops to offices and events-but most people never think about what they are actually made of. The material behind a paper cup is carefully engineered to be strong, safe, and resistant to liquids while still being printable and cost-effective.
In this article, we break down the key materials used in paper cup production and why they matter.
1. The Core Material: Cupstock Paper
The main material used in paper cups is called cupstock paper, a high-strength paperboard designed specifically for liquid packaging.
Key features of cupstock paper:
Made from high-quality virgin wood pulp
Food-grade and safe for direct contact with beverages
Strong rigidity to maintain cup shape
Smooth surface for printing branding and designs
Cupstock paper is the foundation of every paper cup. Without it, the cup would not have the strength needed to hold liquid or maintain its structure when hot drinks are poured in.
2. Why Paper Alone Cannot Hold Liquid
Even though cupstock paper is strong, it is still just paper. If you pour water or coffee into it, it would quickly:
Soak through
Lose shape
Leak
That's why all paper cups require a barrier coating layer.
3. The Waterproof Layer: PE Coating (Most Common)
The most widely used coating in paper cups is polyethylene (PE).
Why PE coating is used:
Creates a waterproof barrier
Prevents leakage
Allows heat sealing during cup forming
Suitable for both hot and cold beverages
There are two common types:
Single-side PE coating → used for most standard cups
Double-side PE coating → used for special applications or high-moisture environments
PE-coated paper cups are currently the most cost-effective and widely used solution in the global market.
4. Eco-Friendly Alternative: PLA Coating
With growing environmental awareness, many manufacturers are shifting toward PLA (polylactic acid) coating.
Benefits of PLA-coated paper:
Made from renewable plant-based resources (like corn starch)
Compostable under industrial conditions
Reduces dependency on fossil-based plastics
However, PLA cups usually require specific composting conditions and may cost more than PE-coated options.
5. New Generation: Water-Based Coating
An emerging technology in paper cup manufacturing is water-based dispersion coating.
Advantages:
Plastic-free or reduced-plastic structure
Better recyclability in some systems
Improved environmental profile
This is still developing but is expected to become more popular as regulations tighten.
6. Typical Paper Cup Structure
A finished paper cup usually has three layers:
Outer layer – printed design (branding & marketing)
Middle layer – cupstock paper for strength
Inner layer – waterproof coating (PE / PLA / water-based)
This structure ensures both durability and functionality.
7. Common Specifications in Industry
Paper cup materials are selected based on usage:
Paper weight (GSM): 150–350 gsm
PE coating weight: 10–30 gsm
Cup sizes: 3oz to 22oz (and larger for special uses)
Higher GSM and thicker coatings are typically used for hot beverages or larger cups.
