Test liner

Test liner is a type of paperboard used in the manufacturing of corrugated cardboard, which is widely used for packaging applications. It serves as the innermost layer in a typical corrugated box structure. Test liner is designed to provide structural strength, rigidity, and protection to the contents of a package while also offering printing capabilities for branding and labeling

Key Characteristics of Test Liner

Sturdy Composition

  • Test liner is typically made from recycled paper pulp or a mixture of recycled and virgin fibers. This composition gives it the necessary strength and durability required for packaging.

Two Sides, One Purpose

  • Test liner is often coated on one or both sides to improve its surface finish, allowing for high-quality printing. The coated side is usually referred to as the "top liner" when used in corrugated packaging

Weight and Thickness

  • Test liner is available in various weights and thicknesses, with options to suit different packaging requirements. Common weights are measured in grams per square meter (GSM).s.


  • Like most paper-based packaging materials, test liner is recyclable, making it an eco-friendly choice in the packaging industry.

Applications of Test Liner

Corrugated Packaging

  • Test liner is an integral component in the production of corrugated boxes, which are used for shipping, storage, and packaging of various products, from consumer goods to industrial equipment

Printing and Branding

  • The coated side of test liner allows for high-quality printing, making it ideal for adding branding elements, product information, and graphics to packaging.

Box Manufacturing

  • Box manufacturers use test liner to produce the inner layer of corrugated boxes, providing structural support to the overall packaging.

E-commerce and Retail

  • Due to its strength and printability, test liner is commonly used for e-commerce packaging, retail displays, and product packaging in stores.