Chemical Resistant White Kraft Paper Bag | Laminated Leak-Proof | Open Mouth for Chemicals | For Acid, Alkali & Salt Powders

Product Overview: 
This product is a corrosion-resistant white kraft paper bag specially designed for packaging corrosive chemicals such as acid, alkali, and salt powders. The outer layer is made of high-strength white kraft paper, while the inner layer features a corrosion-resistant PE laminated film, creating a multi-layer protective structure. The flat-mouth design is compatible with various filling and sealing methods, and the laminated film’s leak-proof technology effectively prevents liquid penetration and dust spillage.

Applicable materials: 
Acidic powders (citric acid, oxalic acid), alkaline powders (sodium hydroxide, soda ash), salt powders (sodium chloride, sodium sulfate), chemical additives, fine chemicals, and pharmaceutical intermediates.

Core Advantages: 
White kraft paper—clean, laminated for leak-proof performance, corrosion-resistant and suitable for handling acidic, alkaline, and saline powders, with a flat-mouth design for flexible filling.

Corrosion resistance: 
This product is optimized to withstand the corrosive properties of acidic, alkaline, and saline powders. The outer layer is made of acid-resistant white kraft paper, while the inner PE coating provides excellent resistance to acids, alkalis, salts, and other chemicals. Testing has demonstrated that, within a pH range of 3 to 11, the bag maintains structural integrity—showing no softening, embrittlement, or leakage—making it suitable for packaging a wide variety of acidic, alkaline, and saline powders.

White kraft paper material: 
The outer layer is made of high-quality white kraft paper, with a basis weight ranging from 80 to 120 grams per square meter. The white substrate delivers a clean, professional packaging appearance, making it ideal for branding fine chemicals and pharmaceutical-grade products. The surface is smooth, ensuring crisp print quality, and multi-color custom printing is supported.

Laminated leak-proof design: 
This product features a multilayer composite structure consisting of white kraft paper, a PP woven reinforcement layer, and a corrosion-resistant PE laminating layer. The laminating layer is tightly bonded through a thermal lamination process, ensuring no delamination or pinholes and creating a complete leak-proof barrier.

The water vapor transmission rate is reduced by more than 95%, effectively preventing chemicals from absorbing moisture and caking. Liquid water and chemical solutions cannot penetrate the laminated film, ensuring that the contents remain intact even when the bag is exposed to water splashes. For volatile chemicals, the laminated film also provides excellent gas-barrier properties, preventing odor leakage.

Flat-mouth design and sealing: 
Flat-pocket design with a smooth, even pouch opening for easy opening and filling; compatible with screw-fillers, gravity fillers, and manual filling.

After filling, heat-sealing is available, with the PE laminated layer thermally fused to create a fully sealed package that offers excellent leak-proof performance; alternatively, a bag-sewing machine can be used for seam sealing, in which case a sealing strip or liner paper must be added.

Tensile strength: 
≥600 N/50 mm, capable of supporting 10 to 25 kg.

Packaging drop test: 
With a 25 kg payload, it can withstand a 1.2-meter free fall and remain intact—no cracks or material leakage after being dropped on all six sides.

Packaging specifications: 
The loading weight can be customized to 10 kg, 15 kg, 20 kg, or 25 kg; bag dimensions are tailored to specific requirements; and the bottom style is either heat-sealed or sewn with a sealing strip.

Customization Scope: 
Dimensions, printing, aluminum foil barrier layer, antistatic treatment, and UN hazardous packaging certification.

Environmental Compliance: 
Made from entirely new materials: the kraft paper is biodegradable, and the PE and woven layers are recyclable. UN-certified hazardous-materials export packaging is available.

Applicable to: 
Chemical additives manufacturer, fine chemicals company, and pharmaceutical intermediate producer.

Price and MOQ: 
Negotiable.