In the world of Flexible Intermediate Bulk Containers (FIBCs), every component plays a crucial role in ensuring safety, durability, and reliability. While much attention is given to the woven fabric itself, the sewing thread is the unsung hero that holds everything together.

Industry Standard: 840D/3 Sewing Thread

The extreme demands of filling, lifting, transporting, and storing bulk materials (often weighing 500kg to 2000kg) require sewing threads with exceptional strength. For most standard and heavy-duty FIBC applications, the industry relies on a specific high-performance sewing thread: 840D/3.

What does 840D/3 mean?

D stands for Denier: This is a unit of measurement for the linear mass density of the thread. 840 denier indicates the thickness and weight of the yarn.

/3 indicates 3 plies: This means three individual 840D yarns are twisted together to form a stronger thread.

This construction provides the perfect balance between thickness, flexibility, and immense tensile strength, making it the preferred choice for securely stitching the fabric panels together.

Key Advantages of Our 840D/3 FIBC Sewing Thread

Why is 840D/3 thread the preferred choice for FIBC manufacturers? The advantages are clear:

1. Superior Tensile Strength: The primary requirement is preventing seam failure under immense pressure. Our high-tenacity 840D/3 thread is meticulously engineered to withstand the various stresses of lifting and moving heavy loads, ensuring seams remain intact and secure.

2. Excellent Abrasion Resistance: During filling, transportation, and stacking, FIBCs rub against machinery, containers, and each other. The robust construction of the 840D/3 thread provides high resistance to abrasion and wear, protecting the seams from damage and significantly extending the bag's lifespan.

3. Excellent Mold and Chemical Resistance: Made from high-quality synthetic materials (polypropylene or polyester), our threads do not rot, mildew, or degrade from moisture. They are also highly resistant to a wide range of chemicals, ensuring the integrity of the bag even when packaging industrial products. 

4. UV Resistance (Polyester-based 840D/3): For fiber-reinforced plastic bags stored outdoors, UV radiation can be a significant threat. We offer 840D/3 thread made from polyester (PET), which provides excellent UV stability, preventing premature weakening and brittleness caused by prolonged exposure to sunlight.

5. Consistency for High-Speed Sewing: Our 840D/3 thread is manufactured to the highest standards of consistency. This is crucial for automated sewing equipment, as it minimizes breakage, reduces downtime, and improves manufacturing efficiency for our partners.

Conclusion: No Compromise on Details

Sewing thread is a critical safety component in every bulk bag. Choosing a reliable, high-performance sewing thread like 840D/3 is essential for producing products that our customers can trust to be reliable, safe, and durable.