What is the FIBC Safety Factor? How to Choose Between 1:5 and 1:6?

As a core container for the storage and transportation of bulk commodities, the safety of FIBCs (also known as ton bags or space bags) is of paramount importance.

During procurement, terms like "safety factor 1:5" or "1:6" often confuse buyers. Fujian Dongbai Plastics Technology, combining industry standards with practical experience, provides a professional selection guide for global purchasers.

The FIBC safety factor is the ratio between its ultimate load capacity and its Safe Working Load (SWL), directly determining its risk resistance capability.

Simply put, 1:5 means the ultimate load capacity is five times the SWL, and 1:6 means it is six times. The higher the value, the greater the safety margin.

According to the internationally recognized ISO 21898:2024 standard (replacing the older ISO 21898:2004), a safety factor of not less than 1:5 is the basic safety baseline for FIBCs. Bags must pass rigorous tests such as periodic lifting and vertical drop to be certified. 1:6 falls under the strengthened level specification within the standard, suitable for scenarios with high safety requirements. It is a core mid-to-high-end specification offered by Fujian Dongbai Plastics Technology, fully meeting the stringent safety performance demands of the international market.

The Technical Director of Fujian Dongbai Plastics Technology suggests focusing on three key dimensions for selection: material characteristics, transportation scenario, and frequency of use.

The 1:5 safety factor specification is suitable for loading ordinary lightweight materials like grain and feed, for short-distance transportation, single use, and cost-sensitive procurement. It is a standard mainstream product for enterprises, utilizing high-strength PP woven fabric and undergoing dozens of quality inspections, adapting to basic needs across multiple fields.

The 1:6 safety factor specification is suitable for loading heavy, high-density materials like mineral powder and cement, long-distance sea freight, multiple turnaround cycles, and high-risk scenarios involving corrosive chemical raw materials. It effectively mitigates the risk of bag rupture and provides double-layered safety assurance.

As a benchmark in Fujian's bulk bag industry, Fujian Dongbai Plastics Technology has maintained full-process in-house production since its inception, with a leading annual production capacity. We offer customization based on customer requirements and provide full-process technical support.

Fujian Dongbai Plastics Technology will continue to deepen its expertise in this field, providing safe and suitable storage and transportation solutions for global purchasers through high-quality products and customized services, demonstrating the strength of Chinese enterprises.