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When exporting recycled Polyethylene Terephthalate (pet flakes) across continents, the journey involves weeks at sea, dramatic temperature fluctuations, and high humidity levels. For international buyers—especially sheet extruders, fiber spinners, and bottle-to-bottle recyclers—receiving moisture-contaminated flakes can result in severe processing defects, including hydrolytic degradation during extrusion.
Protecting high-purity rPET requires robust packaging engineering. Here is a technical breakdown of how Flexible Intermediate Bulk Container (FIBC) jumbo bags must be specified to prevent moisture ingress during long-haul ocean shipping.
The Danger of Moisture Ingress in PET Flake Shipping
PET is a hygroscopic polymer, meaning it readily absorbs moisture from the surrounding environment. During ocean transit through tropical and temperate shipping corridors, container condensation (often called “container rain”) poses a severe threat.
If sea moisture penetrates the packaging:
[Moisture Ingress in Transit] ➔ [Hydrolytic Degradation at Extrusion] ➔ [Drop in Intrinsic Viscosity (IV)] ➔ [Brittle End Product]
To maintain an optimal pre-drying target (moisture content < 1.0%) upon arrival, packaging standards must be non-negotiable.
Critical FIBC Jumbo Bag Specifications for Ocean Transit
To ensure complete protection against moisture, humidity, and physical contamination during maritime shipping, FIBC jumbo bags should meet the following technical criteria:
1. Heavy-Duty Polyethylene (PE) Form-Fit Liners
Standard woven polypropylene (PP) fabric alone is porous and will let ambient humidity seep into the flakes. Ocean export bags must feature an inner LDPE or LLDPE liner (typically 80 to 120 microns thick). Form-fit or gusseted liners sealed with tamper-evident ties create a vapor-tight barrier against moisture.
2. UV-Stabilized Coated Woven Polypropylene
The outer bag structure must be constructed from heavy-duty, UV-stabilized woven PP fabric (typically 180–220 GSM). Lamination or coating on the outer fabric provides a secondary shield against water spray and UV degradation during port handling.
3. Dust-Proof Seams (Sift-Proof Stitching)
Fine polymer particles and dust can escape—or moisture can enter—through needle holes in standard bag seams. FIBC bags designed for export incorporate felt filler cords or single/double dust-proof stitching along all seams to seal pinholes completely.
4. Structural Safety & Handling Efficiency (5:1 or 6:1 Safety Factor)
Ocean shipping involves dynamic stress during crane lifting, container loading, and forklift maneuvering. Export bags require a Safe Working Load (SWL) of 1,000 kg to 1,250 kg with a certified Safety Factor (SF) of 5:1 (single-trip export) or 6:1 (multi-trip), featuring reinforced corner-lifting loops.
Read More: A Step-by-Step Guide to Importing PET Flakes from Bangladesh via Chittagong Port
Packaging Specification Comparison for PET Flake Export
| Feature / Spec | Standard Local FIBC Bag | Ocean Export-Grade FIBC Bag | Impact on PET Flake Quality |
| Inner Protection | Unlined or Loose Poly Bag | 80–120 µm PE Form-Fit Sealed Liner | Blocks vapor/humidity ingress & ocean spray |
| Fabric Coating | Uncoated Woven PP | Laminated / Coated Woven PP (180+ GSM) | Secondary moisture & dust barrier |
| Seam Construction | Standard Stitching | Dust-Proof / Sift-Proof Filler Cord | Prevents seam leakage & contamination |
| Safe Working Load | 500 – 800 kg | 1,000 – 1,250 kg (SF 5:1 certified) | Protects cargo integrity during crane handling |
| Moisture Retention | Varies (> 2.0% risk) |
Guaranteed < 1.0% upon arrival |
Preserves intrinsic viscosity & pre-drying standards |
How Key Mart Limited Fulfills Global Buyer Demand
International importers require an rPET supplier that delivers not only high-purity flakes but also pristine packaging that withstands rigorous ocean freight.
As a premier pet flakes company bangladesh and trusted pet flakes exporter, Key Mart Limited applies strict export packaging protocols to ensure every container arrives dry, clean, and ready for extrusion:
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Export-Engineered FIBC Packaging in Dhaka: As a leading pet flakes manufacturer dhaka, Key Mart Limited packs all export orders in heavy-duty 1,000 kg FIBC jumbo bags fitted with moisture-sealed inner PE liners and dust-proof stitching.
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High-Purity Hot-Washed Flakes: Operating advanced washing lines as an established bangladesh pet flakes manufacturer, we ensure our clear and green flakes maintain PVC < 50 PPM, sub-500 PPM color purity, and high IV stability.
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Reliable Ocean Freight Logistics: As an experienced pet flakes exporter, Key Mart Limited coordinates seamless containerized shipments via sea freight under FOB Chittagong or CFR/CIF destination port terms.
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Complete Batch Certification: Every shipment is backed by batch-specific Certificates of Analysis (CoA), Technical Data Sheets (TDS), and complete L/C customs documentation.
Partner with Key Mart Limited Today
Protect your supply chain with export-grade, moisture-protected rPET flakes. Contact our Dhaka export desk today to request technical product sheets, order commercial samples, or discuss long-term supply contracts.
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Company Name: Key Mart Limited
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Head Office & Factory Address: Plot #31, Road #N-1, Block #K, Eastern Housing, Pallabi 2nd Phase, Rupnagar, Dhaka-1216, Bangladesh.
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Official Website: www.keymartbd.com
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Corporate Email: keymartltd@gmail.com | info@keymartbd.com
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Direct Phone / WhatsApp: +8801760774499, +8801864935478
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