Overview
The four-loop waterproof FIBC is an industrial bulk packaging solution designed for materials requiring moisture protection. Its quadrilateral loop design distributes weight evenly during lifting, while laminated or coated fabrics prevent water ingress. Commonly produced in 90x90x110cm to 110x110x130cm dimensions, these bags meet international standards like ISO 21898 for safe transport. Unlike standard FIBCs, waterproof variants incorporate polyethylene or PVC layers, either as inner liners or laminated coatings. This makes them essential for hygroscopic materials like cement additives, certain food ingredients, and industrial chemicals where even minor moisture exposure could compromise product integrity.
Structure and Working Principle
Structurally, these FIBCs consist of woven polypropylene fabric—typically 150-200gsm—with a waterproof barrier layer. The four lifting loops are made from reinforced PP straps (minimum 5cm width) sewn into corner baffles for load distribution. Some designs feature cross-stitched bases to prevent seam bursting. The waterproofing works through either: 1) Laminated fabrics where PP is bonded to PE/PVC films during weaving, or 2) Separate liner bags inserted during filling. The former offers better puncture resistance, while liners allow replacement between uses. Both methods create a vapor barrier with <1g/m²/24hr water transmission rates when properly sealed.
Key Features
Moisture protection is the standout feature, with laminated versions resisting up to 72 hours of heavy rain exposure. UV-stabilized variants (identified by black strips in the fabric) extend outdoor storage viability. The four-loop design provides superior stability compared to single-loop bags during crane lifting or stacking. Additional features include optional conductive threads for static-sensitive materials (Type C FIBCs), food-grade certifications (FDA/EC1935 for liners), and customized print areas for branding. Top discharge spouts with tie-off systems and bottom duffle closures are common for controlled dispensing of contents.
Application Areas
Primary users include the chemical industry (fertilizers, pigments, plastic resins), where moisture contamination causes clumping or chemical reactions. Food processors use them for hygroscopic ingredients like salt, sugar, or milk powder—often with FDA-approved liners. Construction applications include transporting cement additives and specialty grouts. In agriculture, waterproof FIBCs store treated seeds and foliar nutrients. They’re also adopted in pharmaceuticals for intermediate bulk ingredients, though these often require cleanroom-manufactured bags with documentation trails. Logistics providers prefer them for cross-docking operations where temporary outdoor storage is unavoidable.
Maintenance and Precautions
Inspect loops and seams before each use—frayed loops or stretched stitching indicates replacement need. For laminated bags, avoid folding along creases more than 5 times to prevent coating cracks. Store empty bags flat in <70% humidity environments; never stack more than 10 high to prevent deformation. Cleaning requires mild detergents without abrasives; high-pressure washing damages coatings. For food-grade reuse, follow HACCP protocols including liner replacement and sanitation checks. Discard bags showing pinholes (test by air inflation) or those that carried hazardous materials unless professionally decontaminated.
B2B Procurement Guide
Specify required certifications: UN certification for hazardous materials (13H3/13H4 markings), BRC/IoP for food contact, or ATEX for explosive environments. Volume discounts typically apply at 500+ unit orders, with lead times of 2-6 weeks for customized prints/sizes. Key suppliers include Chinese manufacturers like LFI FlexPak and Western brands such as LC Packaging. For hazardous material transport, verify supplier testing reports for seam strength (minimum 2:1 safety factor) and waterproofing efficacy. Consider hybrid procurement—stocking standard sizes while ordering custom bags for specialty applications.
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