Ton bag

Buyers must prioritize the Safe Working Load (SWL), typically ranging from 500kg to 2000kg, and the Safety Factor (SF), which should be 5:1 for single-use or 6:1 for multi-trip bags. Additionally, verify the fabric weight (GSM)—usually between 160g to 220g—to ensure the polypropylene weave can withstand the internal pressure of the specific material being transported.

For fine powders, select bags with sift-proof seams (felt or cord padding) to prevent leakage. If the material is prone to static buildup, you must use Type B, C, or D antistatic bags to prevent explosions. For moisture-sensitive goods, ensure the bag includes a PE inner liner or a laminated (coated) fabric to provide a waterproof barrier.

Ensure the supplier adheres to ISO 21898, which is the international standard for FIBCs. For food-grade applications, the manufacturer must have BRC or FDA certification and operate a clean-room production facility. For hazardous materials, the bags must meet UN Certification standards for the transport of dangerous goods.

The loops are the most critical safety point. Look for reinforced cross-corner loops or side-seam loops made from high-tenacity polyester or polypropylene. Request tensile strength test reports to confirm that the loops can handle 3 to 5 times the rated capacity without deformation or snapping.

The biggest risk is UV degradation; if the supplier uses recycled polypropylene without sufficient UV stabilizers, the bags may become brittle and burst during outdoor storage. Always specify a UV resistance rating (e.g., 200-hour or 500-hour testing) in the contract. Another risk is weight cheating, where suppliers reduce the fabric GSM to lower costs; always conduct a third-party pre-shipment inspection to weigh random samples.

Ton bags are bulky. To maximize container utilization, request the supplier to use heavy-duty hydraulic baling presses to compress the bags. A standard 40HQ container can typically hold 3,000 to 4,000 compressed bags, whereas uncompressed pallets would hold significantly less. Use FOB terms to maintain control over your freight forwarder and ensure the best sea freight rates.

Focus on Total Cost of Ownership (TCO) rather than just the unit price. Negotiate for customized printing and labeling to be included in the price for orders exceeding 1,000 units. Ask for a sample credit, where the cost of the initial sample and air courier is deducted from your first bulk order. For long-term partnerships, aim for Net 30 payment terms after a successful 6-month history of T/T transactions.

Utilize the Secured Trading services provided by Made-in-China.com to protect your payment until the goods are shipped. Insist on a loading supervision report to ensure the bags are not damaged by forklifts during the container stuffing process. For large-scale industrial buyers, it is recommended to perform an annual factory audit to verify the supplier's raw material sourcing and quality control consistency.