Why Is Lifting Loop Strength Testing Critical for FIBC Bags?
During daily operations, bulk bags are repeatedly lifted by forklifts or cranes. If the lifting loops are not strong enough, it can result in:
Sudden loop breakage and material spillage
Unstable lifting and handling risks
Damage to equipment or injury to personnel
For this reason, lifting loop strength testing is a mandatory quality-control step before FIBC bags are delivered to customers-especially for heavy-duty bulk bags used in construction, chemicals, minerals, agriculture, and waste handling.
👉 Learn more about our lifting loop here:
Safety Factor Requirements for Lifting Loops
The lifting loop strength of a bulk bag is closely related to its Safety Factor (SF):
5:1 Safety Factor – Designed for single-use bulk bags
6:1 Safety Factor – Designed for multi-trip or reusable bulk bags
For example, a bulk bag with a Safe Working Load (SWL) of 1,000 kg must have lifting loops capable of withstanding 5,000 kg or 6,000 kg during testing without failure, tearing, or excessive deformation.
Common Reference Standards
ISO 21898 – International FIBC standard
EN 1898 / EN 277 – European standards
Customer-specific internal testing requirements
Products Description
Simulating Real-World Operating Conditions
Rather than relying only on static load testing, professional FIBC manufacturers perform realistic simulation tests that reflect actual usage scenarios.
Dynamic Load Testing
Bulk bags are filled with water or sand to reach or exceed the rated load.
Bags are lifted multiple times using cranes or forklifts.
Controlled swinging and movement are applied to simulate real handling stress.
Sustained Load Testing
Fully loaded bulk bags are lifted and held for a defined period.
Lifting loops are inspected for stretching, seam failure, or fabric damage.
These tests ensure the lifting loops perform safely during real loading, transportation, and unloading processes.
Key Factors That Affect Lifting Loop Strength
Webbing GSM (Weight per Square Meter)
Higher GSM webbing generally provides greater tensile strength
Stitching and Sewing Structure
Single-fold stitching
Double-fold reinforced stitching
Cross-lock or box stitching
Loop-to-Bag Connection Design
Corner loops, side-seam loops, or fully wrapped loop structures
Raw Material Quality
High-quality polypropylene (PP) yarn ensures consistent strength and durability
For applications requiring frequent lifting or repeated use, reinforced lifting loops and heavy-duty FIBC designs are strongly recommended.
👉 View our reinforced Bulk Bag solutions here:
How Lifting Loop Strength Testing Reduces Procurement Risk
Practical Benefits for End Users
Proper lifting loop strength testing provides customers with:
Reduced risk of bag failure
01
Improved safety during material handling
02
Longer service life of bulk bags
03
Lower total operational and replacement costs
04
This is why many international buyers request testing procedures, load test reports, or testing videos before placing bulk bag orders.
Tested Lifting Loops Mean Safer Bulk Bag Operations
While pricing is an important factor, bulk bags without verified lifting loop strength testing often carry hidden safety and operational risks. Choosing an FIBC supplier that offers structured testing, sample evaluation, and technical support helps ensure safe and efficient material handling.
If you are looking for customized bulk bags with verified lifting loop strength testing, feel free to contact us for technical details, samples, and test documentation.
