Exploring 320g 18gpe Kraft Paper: Composition, Grades, and Industrial Uses

Types of 320g 18gpe Kraft Paper

320g 18gpe kraft paper is a heavyweight, high-strength paper widely used across packaging, industrial, and food service industries. With a basis weight of 320 grams per square meter and a Gurley porosity (GPE) of 18, this paper offers exceptional durability, tear resistance, and barrier performance. Its versatility allows for multiple specialized variants tailored to specific functional and aesthetic requirements.

White-Lined Kraft Paper

Features a smooth, bright white surface on one side and a natural brown kraft texture on the reverse. The white side is optimized for high-resolution printing, while the kraft back provides structural strength.

Advantages

• Excellent printability for branding and labels
• Strong tensile and burst resistance
• Cost-effective for premium packaging
• Eco-friendly and recyclable

Limitations

• White layer may reduce biodegradability slightly
• Not inherently grease or moisture resistant
• Higher cost than standard kraft paper

Best for: Retail packaging, gift boxes, printed carrier bags, and branded product wraps

Grease-Resistant Kraft Paper

Treated or coated with specialized barriers (e.g., silicone or fluorocarbon-free solutions) to repel oils and fats, preventing penetration and maintaining integrity when in contact with greasy foods.

Advantages

• Prevents oil seepage and staining
• Maintains freshness and hygiene
• Compliant with food safety standards (FDA, EU)
• Biodegradable and compostable options available

Limitations

• May require special disposal in composting facilities
• Limited water resistance without additional coating
• Potential for higher production costs

Best for: Fast food wrappers, bakery sheets, sandwich bags, and fried food packaging

Coated Kraft Paper

Enhanced with a surface coating—such as clay, latex, or water-based polymers—to improve smoothness, gloss, and print fidelity. The coating also adds moderate moisture and grease resistance.

Advantages

• Superior print quality with vibrant colors
• Improved surface uniformity
• Enhanced protection against moisture and abrasion
• Versatile for both decorative and functional uses

Limitations

• Coatings may reduce recyclability
• More expensive than uncoated variants
• Environmental impact depends on coating type

Best for: Premium product packaging, luxury gift wraps, labels, and high-end printed materials

Reinforced Kraft Paper

Engineered with embedded synthetic fibers, polymer nets, or wire mesh to significantly increase tensile strength and puncture resistance, making it ideal for heavy-duty applications.

Advantages

• Exceptional strength and durability
• Resists tearing and bursting under load
• Suitable for harsh environments (e.g., construction, agriculture)
• Long service life in demanding conditions

Limitations

• Reduced flexibility and foldability
• Heavier than standard kraft paper
• Higher cost due to added materials

Best for: Industrial sacks, cement bags, hazardous material packaging, and heavy machinery wrapping

High Tear Resistance Kraft Paper

Produced using long-fiber pulps and specialized refining processes or additives to maximize resistance to tearing and cracking, even under stress or rough handling.

Advantages

• Outstanding resistance to tearing and edge damage
• Performs well in outdoor and transport conditions
• Ideal for reusable or long-life packaging
• Maintains integrity in cold or humid environments

Limitations

• Slightly stiffer and less pliable
• May require specialized cutting equipment
• Premium pricing due to advanced processing

Best for: Shipping sacks, moving envelopes, outdoor packaging, and durable carrier bags

Expert Tip: When selecting 320g 18gpe kraft paper, consider the end-use environment. For food applications, ensure compliance with food-grade safety certifications. For outdoor or high-moisture conditions, pair high tear resistance paper with a moisture-resistant coating for optimal performance.

Industrial Applications of 320g 18gpe Kraft Paper

320g 18gpe kraft paper is a high-performance industrial-grade material renowned for its exceptional strength, durability, and environmental sustainability. With a basis weight of 320 grams per square meter and a greaseproof efficiency (GPE) rating of 18, this kraft paper offers superior resistance to oils, moisture, and mechanical stress. These characteristics make it an ideal choice across a wide range of industrial sectors where reliability and eco-friendliness are paramount.

Manufactured from virgin wood pulp using the kraft process, this paper retains long cellulose fibers that enhance tensile strength and tear resistance. Its natural brown hue and uncoated surface also make it highly printable and compatible with adhesives, further expanding its utility in packaging and labeling. Below are the key industrial applications where 320g 18gpe kraft paper excels.

Key Industrial Applications

Packaging Materials

One of the most widespread uses of 320g kraft paper is in the production of heavy-duty packaging such as shopping bags, corrugated boxes, wrapping sheets, and multi-wall sacks. Its high grammage provides excellent load-bearing capacity, making it suitable for packaging bulky or heavy goods like hardware, machinery parts, and retail products.

Unlike many single-use plastics or lightweight papers, 320g kraft paper maintains structural integrity under stress and resists punctures and tears during handling and transport. It also works effectively in combination with other materials—such as bubble wrap or foam liners—to enhance product protection while remaining fully recyclable and biodegradable.

Shipping Supplies

In logistics and e-commerce, 320g 18gpe kraft paper is used to create protective shipping components including padded envelopes, void fill, interleaving sheets, and internal liners. Its thickness and density provide a robust buffer against impacts, vibration, and abrasion during transit.

The greaseproof properties (18gpe) add an extra layer of defense against oils and moisture, which is particularly beneficial when shipping food-related equipment, automotive parts, or industrial tools. By minimizing product damage, this paper reduces return rates and enhances customer satisfaction, contributing to a more sustainable and cost-effective supply chain.

Industrial Bags and Sacks

This kraft paper is extensively used in manufacturing multi-ply industrial sacks for transporting bulk materials such as cement, fertilizers, animal feed, grains, and powdered chemicals. These bags are engineered to withstand rigorous conditions, including stacking, lifting by forklifts, and exposure to varying climates.

The 320g weight ensures minimal risk of bursting or seam failure, even at full load capacity. When combined with coatings or laminates, the paper can achieve enhanced moisture resistance without compromising its compostability. Many industries prefer these paper sacks over plastic alternatives due to their lower environmental impact and compliance with green packaging regulations.

Craft and Stationery Products

Within industrial-scale stationery manufacturing, 320g kraft paper is a preferred substrate for producing durable tags, labels, instruction manuals, file folders, and binding covers. Its rigidity supports clean folding and creasing, while its fibrous texture allows for strong adhesive bonding and embossing.

Artisans and commercial craft suppliers also value this paper for DIY projects, gift wrapping, and custom packaging due to its rustic aesthetic, ease of customization, and ability to hold intricate cuts and shapes. Its eco-conscious image aligns well with sustainable branding strategies in retail and design industries.

Labels and Protective Covers

The durability and chemical resistance of 320g 18gpe kraft paper make it ideal for industrial labeling and protective covering applications. It is commonly used for product tags, warning labels, and temporary protective wraps in sectors such as food processing, automotive, and construction.

These labels remain legible and intact under exposure to heat, humidity, grease, and mild solvents. Additionally, the paper’s tear resistance ensures that protective covers stay in place during handling and storage, shielding surfaces from scratches, dust, and corrosion. Its compatibility with thermal and inkjet printing allows for clear barcode and text reproduction.

Specialty and Emerging Uses

Beyond traditional applications, 320g kraft paper is gaining traction in innovative fields such as:
• Food service packaging – grease-resistant wraps for fast food and takeaway items.
• Textile and leather protection – interleaving sheets to prevent scuffing during storage.
• Architectural modeling – rigid yet workable material for prototypes and displays.
• Sustainable insulation – layered sheets used in eco-friendly building materials.

As industries continue to shift toward circular economy models, the demand for versatile, recyclable materials like 320g 18gpe kraft paper is expected to grow significantly.

Why Choose 320g 18gpe Kraft Paper?

Important: While 320g 18gpe kraft paper is highly durable, its performance can be affected by prolonged exposure to direct water immersion or extreme temperatures. For applications requiring full waterproofing or chemical resistance, consider pairing it with eco-friendly coatings or laminates. Always verify compatibility with your specific use case and regulatory standards, especially in food-contact or hazardous material environments.

Product Specifications and Features of 320g 18gpe Kraft Paper

The 320g 18gpe kraft paper is a high-performance packaging material engineered for durability, functionality, and environmental responsibility. The designation "320g" refers to the paper’s weight per square meter (grams per square meter, or GSM), while "18gpe" stands for "18 grams of polyethylene equivalent," indicating the thickness and protective qualities of the plastic coating. This combination results in a robust, multi-functional material ideal for demanding industrial and commercial applications. Below is a detailed breakdown of its key specifications and features.

Weight and Thickness

The 320g/m² weight signifies a heavy-duty kraft paper with exceptional density and structural integrity. At approximately 0.4 mm thick, it is significantly heavier and more rigid than standard kraft paper (which typically ranges from 50g to 120g). This high grammage enhances resistance to tearing, puncturing, and compression—critical for protecting goods during transport and storage.

• High tear and burst strength suitable for heavy or sharp-edged products
• Excellent dimensional stability under load and moisture exposure
• 18gpe coating provides a plastic-like barrier without sacrificing paper-based structure

Technical Insight: The 18gpe rating reflects the equivalent thickness of a polyethylene film, offering similar moisture resistance while maintaining breathability and printability.

Material Composition and Layering

Constructed from long-fiber softwood pulp, this kraft paper offers superior tensile strength and durability. It often incorporates a percentage of recycled cellulose fibers, supporting sustainable manufacturing practices without compromising performance.

The key innovation lies in the polyethylene (PE) extrusion lamination process, where molten PE is applied to one or both sides of the kraft base. This creates a seamless, waterproof, and grease-resistant barrier that bonds permanently to the paper substrate.

• Bonded via heat-activated extrusion for uniform, flexible, and durable coating
• Available in single-side or double-side PE lamination depending on application needs
• Resistant to oils, fats, and aqueous solutions—ideal for food-safe packaging

Sustainability Note: While the PE layer complicates traditional recycling, advancements in recyclable PE films and compostable alternatives are improving end-of-life options.

Surface Characteristics and Finish

The 320g 18gpe kraft paper features a dual-surface design that combines functionality with aesthetic appeal. The uncoated kraft side has a rough, natural texture that enhances grip and promotes strong adhesion for glues, tapes, and labels. This rustic appearance is often favored in eco-conscious branding and artisanal packaging.

In contrast, the PE-coated side offers a smooth, glossy finish that is ideal for high-quality printing using flexographic or offset techniques. This makes the material suitable for branded packaging, product labeling, and retail-ready wraps.

• Untreated kraft side: High friction, excellent for stacking and securing
• PE-coated side: Water-repellent, printable, and resistant to smudging
• Ideal for heat sealing when used in bag or pouch configurations

Design Advantage: The contrast between natural kraft and sleek PE finish allows for creative branding while maintaining industrial strength.

Environmental and Safety Considerations

As sustainability becomes a priority across industries, the 320g 18gpe kraft paper stands out for its balance of performance and eco-friendliness. The kraft base is made from renewable wood sources and is inherently biodegradable and recyclable in appropriate facilities.

Manufacturers use elemental chlorine-free (ECF) bleaching processes to reduce harmful dioxin emissions and minimize environmental impact. Additionally, the production process is optimized for energy efficiency and reduced water consumption.

• Complies with food contact safety standards when using food-grade PE
• Lower carbon footprint compared to fully synthetic packaging materials
• Supports corporate sustainability goals and green certifications

Eco Tip: Pair with compostable adhesives or bio-based PE coatings to enhance recyclability and reduce landfill impact.

Professional Recommendation: For applications requiring moisture resistance, durability, and printability—such as food wrapping, industrial liners, or heavy-duty shipping sacks—320g 18gpe kraft paper offers an optimal balance of strength and functionality. When advising clients, emphasize its suitability for both protective packaging and premium branding, especially in sectors like organic foods, artisan goods, and eco-friendly retail.

Common Applications

• Food Packaging: Butcher paper, cheese wraps, bakery bags, and grease-resistant liners
• Industrial Use: Protective wrapping for metal parts, machinery, and textiles
• Retail & E-commerce: Branded wrapping paper, gift wrap, and mailer bags
• Agriculture: Root ball wrapping, nursery plant protection, and mulch barriers
• Construction: Temporary surface protection and moisture barriers

How to Choose 320g 18gpe Kraft Paper: A Comprehensive Buyer’s Guide

Selecting the right 320g 18gpe kraft paper is essential for achieving optimal performance in packaging, printing, and industrial applications. The combination of 320 grams per square meter (gsm) basis weight and 18 grams per square foot (gpe) tear resistance indicates a heavy-duty, durable paper ideal for demanding uses. However, making the right choice requires more than just knowing the specifications—understanding key selection criteria ensures your material meets functional, aesthetic, and environmental requirements.

Important Note: "320g 18gpe" refers to a high-strength kraft paper with a basis weight of 320 grams per square meter and a tear resistance of 18 grams per ply equivalent. This specification is commonly used in industrial packaging, luxury retail wrapping, and food-safe containers where durability and performance are critical.

Key Factors to Consider When Buying 320g 18gpe Kraft Paper

1. Specific Weight (Basis Weight)

   The 320gsm (grams per square meter) measurement defines the paper’s density and thickness. This high basis weight makes the paper exceptionally sturdy, ideal for:

   • Heavy-duty packaging such as bags, pouches, and wrapping for industrial goods
   • Reinforced envelopes and mailing solutions requiring puncture resistance
   • Luxury retail packaging where premium feel and structure are desired
   • Applications needing minimal sag or deformation under load

   Tip: While 320gsm provides excellent strength, ensure it aligns with your machinery’s feeding and sealing capabilities, as heavier papers may require adjustments in processing equipment.

2. Type of Kraft Paper

   Not all kraft papers are created equal—even at the same weight. The type determines suitability for specific applications:

   • Natural Brown Kraft: Eco-friendly, unbleached, and widely used in sustainable packaging. Offers a rustic, organic aesthetic.
   • White-Lined Kraft (WLC): One side is bleached white for superior printability and branding, while the reverse remains brown for strength. Ideal for premium product labels and visible packaging surfaces.
   • Grease-Resistant Kraft: Treated to resist oils and fats, making it perfect for food packaging like burger wrappers, pastry bags, and takeaway containers.
   • Sulfate vs. Sulfite Kraft: Sulfate (Kraft process) offers higher tear strength and moisture resistance, which aligns well with the 18gpe specification.
3. Coating and Treatment

   Surface treatments enhance functionality and extend application range:

   • Polyethylene (PE) Coating: Adds water, oil, and moisture resistance. Extrusion-coated 320g kraft paper is widely used in food service and wet-environment packaging.
   • Barrier Coatings: Options like PLA (polylactic acid) offer compostable alternatives for eco-conscious brands.
   • Heat-Sealable Layers: Enable automated bag-making and sealing processes in production lines.
   • Anti-Glare or Matte Treatments: Improve readability and reduce reflection on printed surfaces.

   For 18gpe tear-resistant paper, ensure coatings do not compromise the structural integrity or flexibility needed for folding and creasing.

4. Surface and Aesthetics

   The visual and tactile qualities impact brand perception and end-user experience:

   • Matte Finish: Provides a soft, non-reflective surface that conveys sophistication and elegance. Commonly used in high-end retail, cosmetics, and artisanal product packaging.
   • Glossy Finish: Enhances color vibrancy and shine, ideal for promotional materials, gift wraps, and eye-catching displays.
   • Texture: Some 320g papers feature embossed or linen finishes for added luxury and grip.
   • Print Compatibility: Ensure the surface accepts ink well—especially important for digital or offset printing. Pre-testing is recommended for large print runs.
5. Thickness and Durability

   At 320gsm, this paper typically ranges from 0.4mm to 0.5mm in thickness, offering:

   • High puncture and tear resistance (18gpe confirms strong internal bonding)
   • Excellent stacking strength for multi-layer packaging
   • Limited flexibility compared to lighter grades—ideal for rigid or semi-rigid structures
   • Potential challenges in folding or creasing without proper scoring

   Pro Tip: Balance durability with workability. If your application involves intricate folding or bag forming, consider pre-creasing or using a flexographic press designed for heavy substrates.

Expert Tip: Request sample rolls before bulk ordering. Test the 320g 18gpe kraft paper on your printing, folding, and sealing equipment to ensure compatibility. Evaluate performance under real-world conditions such as humidity, stacking load, and transport stress.

Additional Selection Recommendations

• Check Certifications: Look for FSC, PEFC, or compostable certifications if sustainability is a priority.
• Supplier Reliability: Choose suppliers with consistent quality control and batch-to-batch uniformity.
• Roll Size & Core Diameter: Confirm compatibility with your converting or printing machinery.
• Storage Conditions: Store in a dry, temperature-controlled environment to prevent warping or moisture absorption.
• End-of-Life Considerations: Coated papers may not be recyclable; assess environmental impact based on coating type.

Choosing the right 320g 18gpe kraft paper involves balancing technical performance with aesthetic and environmental goals. By carefully evaluating basis weight, paper type, coatings, surface finish, and thickness, you can select a material that enhances product protection, strengthens brand identity, and meets industry standards. When in doubt, consult with your supplier or a packaging specialist to ensure your choice aligns perfectly with your application needs.

Frequently Asked Questions About 320g 18gpe Kraft Paper

Yes, 320g kraft paper is fully recyclable due to its primary composition of cellulose fibers, which are derived from renewable wood pulp and are both biodegradable and compostable under appropriate conditions. However, when combined with a polyethylene (PE) coating—such as the 18gpe layer—recycling becomes more complex.

• Kraft Paper Base: The 320g paper substrate is easily processed in standard paper recycling streams.
• Polyethylene (18gpe) Layer: This thin plastic film is not biodegradable but can often be separated and recycled in specialized facilities that handle laminated materials.
• Recycling Tip: Check with local recycling programs—some accept laminated paper products, while others require separation or may classify them as mixed waste.

To support sustainability, consider using PE-coated kraft paper in applications where reuse or industrial composting is possible, especially when recycling infrastructure is limited.

Combining a robust 320gsm kraft paper base with an 18gsm polyethylene coating results in a material that excels in durability, moisture resistance, and load-bearing capacity. This makes it ideal for demanding industrial and commercial applications.

• Heavy-Duty Packaging: Used for packaging bulky or heavy items such as construction materials, machinery parts, and hardware.
• Shipping Sacks and Bags: Ideal for transporting goods that require protection from moisture, dirt, and grease during transit.
• Industrial Wrapping: Frequently used to wrap large components, pipes, or equipment to prevent corrosion and physical damage.
• Food Industry (when certified): Applied in food-grade packaging for dry or frozen goods when treated and compliant with food safety standards.
• Construction and Agriculture: Employed as protective sheeting or temporary coverings due to its strength and weather resistance.

This composite material bridges the gap between eco-friendly paper and high-performance plastic, offering a balanced solution for tough packaging needs.

The extrusion lamination process bonds molten polyethylene directly onto the kraft paper surface, creating a strong, molecular-level adhesion that enhances the functional properties of the final product.

• Superior Bonding: Unlike adhesive lamination, extrusion creates a seamless, durable bond that resists delamination under stress or moisture exposure.
• Moisture Barrier: The PE layer effectively blocks water vapor and liquid, protecting contents from humidity and spills.
• Grease and Chemical Resistance: Prevents oils, fats, and certain chemicals from penetrating the paper, making it suitable for food and industrial use.
• Enhanced Durability: Increases tear resistance and structural integrity, especially in wet or rough handling conditions.
• Flexibility: Maintains the paper’s foldability while adding toughness, allowing for easy forming into bags or wraps.

This process is widely used in sustainable packaging to combine the environmental benefits of paper with the performance of plastic, reducing reliance on fully synthetic materials.

“18gpe” stands for **18 grams per square meter of polyethylene**, indicating the weight and thickness of the plastic coating applied to one side of the kraft paper. This measurement is a standard way to quantify the density and protective capacity of the PE layer.

An 18gpe coating provides an optimal balance between cost, recyclability, and performance—offering strong protection without excessive plastic use, aligning with eco-conscious packaging goals.

Yes, 320g 18gpe kraft paper **can be food safe**, but only if it is specifically manufactured and certified for food contact applications. Not all versions of this material are suitable for direct food use.

• PE as a Hygienic Barrier: The polyethylene layer prevents moisture, grease, and microbial contamination from reaching the food, maintaining freshness and safety.
• Ink and Additive Safety: The kraft paper must be treated with food-safe inks and coatings to avoid chemical migration into food products.
• Regulatory Compliance: Look for certifications such as FDA (U.S.) or EU 10/2011 compliance for plastic materials in contact with food.
• Common Food Uses: Includes butcher paper, bakery wraps, freezer bags, and packaging for dry goods like flour or sugar.

Always verify with the supplier that the specific product meets food safety standards before using it in food packaging applications.