Polythene bag

Buyers must distinguish between LDPE (Low-Density Polyethylene), which offers high clarity and flexibility for retail, and HDPE (High-Density Polyethylene), known for its strength and 'crinkle' feel, ideal for grocery bags. Additionally, specify the thickness (measured in microns or mils); for instance, heavy-duty industrial bags typically require above 50 microns to prevent tearing.

Verify that the supplier complies with REACH or RoHS for chemical safety. If the bags are for food contact, they must be FDA or EU Food Grade certified. For markets with plastic bans, ensure the products are EN 13432 or ASTM D6400 certified biodegradable/compostable, or contain the required percentage of PCR (Post-Consumer Recycled) content to meet local tax regulations.

For retail, prioritize reinforced handles (die-cut or loop) and high-quality gravure printing (up to 8-10 colors). For industrial packaging, focus on tensile strength and puncture resistance. If used for electronics, ensure the bags have anti-static properties, while for shipping, a permanent self-adhesive tamper-evident seal is critical.

Request a load-bearing test report to confirm the bag can handle the intended weight without stretching. Check for sealing integrity to prevent bottom-bursting. A professional supplier should maintain ISO 9001 certification and provide pre-shipment inspection (PSI) samples to ensure the color matching (Pantone) and dimensions are within a +/- 2mm tolerance.

The primary risk is regulatory non-compliance, as many countries have strict bans on single-use plastics. Always check the HS Code (typically 392321) against your country's latest environmental laws. Another risk is volume-to-weight shipping costs; since bags are lightweight but bulky, use vacuum compression packing to reduce shipping volume and lower freight expenses.

Since PE is a petroleum derivative, prices fluctuate with global oil prices. Negotiate a price adjustment formula based on raw material indices for long-term contracts. To lower unit costs, increase the order volume to meet the extrusion machine's minimum run, which often results in a 15-20% discount compared to small-batch digital printing.

Utilize Trade Assurance services on Made-in-China.com to protect your payment until the goods are verified. For large orders, insist on a 30% deposit and 70% balance against the Bill of Lading (B/L). Never wire funds to personal accounts; always ensure the beneficiary name matches the company name on the audited supplier profile.

For large volumes, FCL (Full Container Load) sea freight is the most economical. If you are a small business, LCL (Less than Container Load) is viable, but ensure the supplier uses strong outer cartons and pallets to prevent crushing. For urgent custom samples, International Express (DHL/FedEx) is recommended, usually taking 3-7 business days.