01Kehong · Guide

Cupstock vs PE Coated Paper

Clarify the starting material, conversion format and coating requirement before a cupstock project is quoted.

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4 practical topicsOEM / ODMFoshan, Guangdong, China

Separate intended use from material construction

Cupstock describes paperboard intended for cup making. PE-coated paper describes a paper substrate with a polyethylene coating. They are not mutually exclusive: a cupstock grade may also be PE coated. Before comparing offers, identify the base board, coating on each side, supplied format and intended cup component. A printed cup fan, bottom material and unconverted roll are different purchasing items.

Base board

Cupstock specification: State the board grade and target paper grammage for the cup design.
PE-coated construction: Identify the paper or board beneath the PE coating; ask whether quoted GSM refers to base paper or complete coated material.

Coating

Cupstock specification: State whether a barrier is needed and where it will sit on the finished cup.
PE-coated construction: Confirm PE coating type, coated side or sides, and coating weight separately from paper grammage where available.

Supply format

Cupstock specification: Specify roll, sheet, cup fan blank or bottom component, with dimensions and quantity units.
PE-coated construction: Specify whether you need coated stock or a converted component, plus roll or sheet size and winding or print orientation where relevant.

Use conditions

Cupstock specification: Describe the contents, temperature, filling and serving conditions, holding time, forming requirements and intended market.
PE-coated construction: Check the coated construction against the same use and converting conditions; do not infer suitability from the coating name.

Evidence

Cupstock specification: Request the specification and documents relevant to the final material and intended use.
PE-coated construction: Confirm the actual construction and any available project-relevant test or compliance documentation before approval.

Decision	Cupstock specification	PE-coated construction
Base board	State the board grade and target paper grammage for the cup design.	Identify the paper or board beneath the PE coating; ask whether quoted GSM refers to base paper or complete coated material.
Coating	State whether a barrier is needed and where it will sit on the finished cup.	Confirm PE coating type, coated side or sides, and coating weight separately from paper grammage where available.
Supply format	Specify roll, sheet, cup fan blank or bottom component, with dimensions and quantity units.	Specify whether you need coated stock or a converted component, plus roll or sheet size and winding or print orientation where relevant.
Use conditions	Describe the contents, temperature, filling and serving conditions, holding time, forming requirements and intended market.	Check the coated construction against the same use and converting conditions; do not infer suitability from the coating name.
Evidence	Request the specification and documents relevant to the final material and intended use.	Confirm the actual construction and any available project-relevant test or compliance documentation before approval.

Start with the finished cup

Share cup size, intended contents, filling and serving conditions, and whether you are sourcing stock or ready-to-convert components. These details determine which board and barrier questions matter. A GSM figure on its own cannot establish fit, sealing or food-contact suitability.

Check the converting handoff

For rolls, provide width, diameter or other agreed roll details, coating side, print side and winding direction. For sheets, fans or bottoms, provide dimensions, drawing version and quantity unit. Confirm the side that will face the contents and the seam or bottom-sealing method with the converter.

Approve the specific construction

Ask for a sample or specification of the proposed board and coating combination. Check forming, sealing, print appearance and the actual intended use against that sample. Food-contact claims and supporting documents must match the selected construction and destination market; this page does not certify a material for every use.

Common questions

Is cupstock always uncoated?: No. Cupstock names the board's intended converting use, while PE describes one possible coating. A cupstock specification can include a PE layer.
Can GSM tell me whether a cup will work?: No. Grammage is one input. Board construction, coating, forming, sealing, contents and use conditions also need review.

Industry example: Smurfit Westrock TruServ paperboard portfolio (product taxonomy, not a Kehong specification)

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