The small parts that decide whether a bag leaks
High-strength polyester sewing thread
The mainstream FIBC sewing thread, compliant with GB/T 10454. Stable tensile strength wet or dry, with mildew, acid/alkali, UV and ageing resistance — seams stay reliable through outdoor storage and long transport.
PP split-film sewing thread
A polypropylene alternative matched to PP fabric; used where a single-polymer construction is preferred for recycling or where the specification calls for it.
Leak-proof sealing strips
Cotton leak-proof sealing strip, stuffed round cotton cord and flat cotton felt anti-sift strip are fitted at needle penetrations and seams to stop fine powder sifting out through stitch holes.
PE film lamination
External lamination adds a wipe-clean, water-shedding skin; internal lamination puts the film against the product for a moisture barrier. The choice follows whether the risk is weather or product moisture uptake.
Protection through the supply chain
UV-resistant materials
UV-stabilised fabric and thread are specified for outdoor storage and long sun exposure, so tensile strength is retained through the intended service life.
Bundling method
FIBCs are bundled as small packs or palletised large packs, with waterproof and dust-proof wrapping for sea freight. The packing method is part of the quotation, not an afterthought.
Document pouch
A sewn-on document pouch keeps the batch certificate, test file and shipping papers with the bag they belong to — essential for traceability and audit.
What to put on the RFQ
| Item | What to state |
|---|---|
| Sewing thread | Polyester high-strength (GB/T 10454) or PP split-film |
| Seam sealing | Cotton strip / round cord / flat felt, and where it is applied |
| Lamination | Internal or external PE film, and grammage |
| UV | Intended outdoor exposure duration |
| Packing | Small bundle or palletised pack; waterproof / dust-proof wrapping |
| Traceability | Document pouch and batch-level test file |
