Solid Unbleached Board

Solid Unbleached Board (SUB) is a type of paperboard generally produced from unbleached chemical pulp. It usually features two to three layers of mineral or synthetic pigment coating on the front side, with a single coating layer on the back. In some cases, recycled fibers are incorporated to substitute the unbleached chemical pulp.

Known for its natural brown color and high strength, Solid Unbleached Sulphate (SUB) is widely used in packaging applications where durability, sustainability, and cost-effectiveness are key considerations.

Its strength and resilience make it ideal for heavy-duty packaging, while its eco-friendly nature appeals to brands and consumers focused on sustainability. This board is primarily used in packaging for products such as frozen or refrigerated foods, beverage carriers, detergents, cereals, shoes, toys, and more.

Specifications:

Size (Sheet & Roll): Fully customizable
Material grade (GSM)/Grammage (Basis Weight): 220 GSM to 450 GSM
Thickness: 0.4 mm to 1.0 mm, depending on the grammage
Stiffness in Machine Direction (MD): 300 to 1000 mN
Stiffness in Cross Direction (CD): 150 to 500 mN
Tensile Strength in Machine Direction (MD): 4.0 to 8.0 kN/m
Tensile Strength in Cross Direction (CD): 2.0 to 5.0 kN/m
Burst Strength: 200 to 600 kPa, which ensures the board can withstand pressure
Moisture Content: 6% to 9%
Brightness: Generally lower than bleached boards, around 70% to 85%
Porosity: Low porosity to ensure quality printing with minimal ink absorption
Material: Unbleached virgin wood pulp
Applications: Frozen & Chilled Food Packaging, Beverage Carriers, Detergent & Cereal Boxes
Recyclability: Fully recyclable and biodegradable
Origin: India/China