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Before entering into a long-term bulk supply contract for recycled Polyethylene Terephthalate (pet flakes), procuring and testing a physical commercial sample is an indispensable step for procurement officers and quality managers. Whether you are running a high-speed polyester staple fiber (PSF) line, extruding thermoforming sheets, or manufacturing industrial strapping, testing a lab sample ensures the raw material performs seamlessly within your specific machine parameters.
Evaluating a trial batch allows you to verify physical granulation, thermal behavior, and contamination levels before committing to full container shipments.
Here is a step-by-step guide on how to request commercial rPET samples, execute a comprehensive laboratory audit, and partner with a reliable bangladesh pet flakes manufacturer for your production needs.
1. How to Request an Export-Grade Commercial Sample
When contacting a potential rPET supplier, requesting a generic sample isn’t enough. You must specify your exact processing needs to ensure the sample reflects your required grade.
[Define Material Specifications] ➔ [Request 2–5 kg Trial Sample] ➔ [Audit Batch CoA] ➔ [Conduct In-House Lab & Trial Runs]
Key Details to Provide in Your Sample Request:
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Required Color Fraction: Clear (Natural), Green, or Amber/Brown.
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Intended Application: Textile fiber, sheet extrusion, strapping, or injection molding.
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Sample Size: Request 2 to 5 kg for laboratory bench testing, or 25 to 50 kg (bag sample) for short extrusion line trials.
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Required Documentation: Ask for a batch-specific Certificate of Analysis (CoA) and a Technical Data Sheet (TDS) alongside the physical sample.
2. Step-by-Step Quality Control & Testing Protocol
Read More: A Step-by-Step Guide to Importing PET Flakes from Bangladesh via Chittagong Port
Once your sample arrives, run it through these core physical, thermal, and chemical laboratory checks:
Step 1: Sieve Analysis (Granulation Sizing)
Pass the flakes through standard mesh sieves to verify particle distribution.
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Target Benchmark: Uniform particle size between 3 mm and 14 mm.
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Why It Matters: Excessive fine powder (<2 mm) causes burning in the extruder feed throat, while oversized flakes (>15 mm) cause hopper bridging.
Step 2: Solvent & Thermal PVC Detection Test
To test for destructive Polyvinyl Chloride (PVC) contamination, perform a solvent dissolution test or a thermal oven bake test (baking flakes at ~200°C for 30 minutes; PVC turns dark brown/black while PET remains clear).
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Target Benchmark: < 50 PPM PVC contamination.
Step 3: Intrinsic Viscosity (IV) & Moisture Testing
Evaluate molecular chain length using capillary viscometry (ASTM D4603) and measure moisture content via Karl Fischer titration or loss-on-drying instruments.
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Target Benchmarks: IV rating between 0.65 and 0.85 dL/g (depending on application) and moisture content < 1.0%.
Step 4: Color & Purity Inspection (L*, a*, b*)
Check the flakes under spectrophotometry to verify brightness ($L^*$) and ensure minimal yellowing ($b^*$).
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Target Benchmark: > 99% clear color purity with zero heavy metal or glue contamination.
Technical Sample Testing Checklist
| Test Parameter | Test Method / Standard | Target Benchmark | Potential Processing Defect |
| PVC Contamination | Thermal Oven / Solvent Test | < 50 PPM |
Acid corrosion, black specks, filter clogging |
| Particle Size | Screen Mesh Sieve | 3 – 14 mm |
Hopper bridging, inconsistent melt density |
| Intrinsic Viscosity (IV) | ASTM D4603 / ISO 1628-5 | 0.65 – 0.85 dL/g |
Filament breakage, weak sheet tensile strength |
| Moisture Content | Loss-on-Drying Oven | < 1.0% |
Hydrolytic degradation, rapid IV drop |
| Non-PET Impurities | Manual & Optical Audit | < 0.05% |
Melt pressure surges, degraded surface clarity |
How Key Mart Limited Fulfills Global Buyer Demand
Taking the risk out of international rPET procurement starts with transparent sampling and rigorous quality assurance. As a premier pet flakes company bangladesh and trusted pet flakes manufacturer dhaka, Key Mart Limited streamlines the sampling and verification process for global buyers:
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Fast Sample Dispatch: We provide global procurement teams with verified 2–5 kg lab samples or bag-sized trial lots shipped directly via international air courier, complete with batch-specific Certificates of Analysis.
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Guaranteed Sub-50 PPM PVC Levels: Operating modern caustic hot-washing, friction washing, and Near-Infrared (NIR) optical sorting plants in Dhaka, we guarantee >99% clear purity and sub-50 PPM PVC levels across both sample lots and bulk shipments.
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Uniform Particle Granulation: Precision screening delivers consistent 3–14 mm flake sizing, ensuring smooth feeding without extruder screw bridging.
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High Monthly Export Capacities: As an established pet flakes exporter, Key Mart Limited supports trial approvals with seamless transition into recurring multi-container monthly shipments for fiber and sheet manufacturers globally.
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Reliable Logistics & Trade Terms: We offer flexible Incoterms (FOB Chittagong or CFR/CIF destination ports) with complete L/C compliance and error-free export documentation packages.
Partner with Key Mart Limited Today
Ready to verify our quality on your own production line? Contact our export team today to request a commercial sample, review our Technical Data Sheets (TDS), or discuss trial orders.
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Company Name: Key Mart Limited
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Head Office Address: Dhaka, 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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