Woven sacks bags

When evaluating woven sacks (PP bags), you must prioritize GSM (Grams per Square Meter), which determines the bag's strength and load-bearing capacity. For standard industrial use, a GSM of 60-80 is common, while heavy-duty applications require 90-120+ GSM. Additionally, verify the mesh count (e.g., 10x10 or 12x12) to ensure weave density, and check if the bag requires UV stabilization if it will be exposed to sunlight, as untreated polypropylene degrades quickly under UV rays.

If the sacks are intended for flour, sugar, or grain, they must be produced from 100% virgin polypropylene resin. You should request FDA or EC 1935/2004 compliance certificates to ensure no toxic recycled materials are present. Furthermore, for fine powders, ensure the supplier offers PE inner liners or lamination (BOPP) to prevent leakage and moisture ingress.

Consider the closure and handling methods: Heat-cut or hemmed tops prevent fraying, while anti-skid/anti-slip weaving is essential for stable palletizing and stacking in warehouses. For branding, BOPP multi-color printing provides high-resolution graphics that enhance shelf appeal compared to standard flexographic printing.

A professional supplier should provide test reports for tensile strength (warp and weft) and elongation percentage. During inspection, ensure a weight tolerance of ±2-3% and check the stitching integrity at the bottom (single or double fold) to prevent bursting during transport.

This is a common risk in low-cost sourcing. Request a pre-shipment sample and perform a 'burn test' or transparency check; virgin PP is typically more translucent and odorless. Use Made-in-China.com's Secured Trading services to hold payment until a third-party inspection (like SGS or Intertek) confirms the material composition matches your specifications.

Woven sacks are lightweight but bulky. To optimize costs, request hydraulic baling/compression packing, which can increase the number of bags per container by up to 30%. For large orders, FCL (Full Container Load) is significantly more economical than LCL, as it reduces the risk of contamination from other goods and lowers the per-unit freight cost.

Focus on raw material price indexing. Since PP prices fluctuate with global oil markets, negotiate a price formula based on the current PP resin index. Additionally, offer a longer-term forecast in exchange for a 5-10% volume discount, and always clarify if the quoted price includes plate-making fees for customized printing.

Check for Anti-Dumping Duties (ADD) in your specific country. Some regions (like the EU or USA) have historically applied duties on plastic woven products from certain origins. Ensure the supplier provides a Certificate of Origin (CO) to help you benefit from preferential tariffs under trade agreements like RCEP or GSP.