FIBC Dustproof and Sewing Options
FIBC Dustproof and Sewing Options
Fine powders can migrate through fabric, needle holes and seam paths. Sift resistance is therefore developed as a complete construction involving fabric coating, seam geometry, sewing thread, filler cord and, when required, an inner liner. The appropriate level depends on particle size, product behaviour and the filling pressure.
Containment Construction Options
- Uncoated fabric and standard seams: suitable only where the packed product and process do not require enhanced sift resistance.
- Coated fabric: helps reduce product migration through the woven body fabric.
- Filler cord in seams: cord positioned in selected sew lines can reduce direct leakage paths.
- Enhanced seam combinations: seam type, stitch pattern and one or more sealing cords are defined around the application.
- Inner liner: provides a separate film layer where higher containment or barrier performance is required.
Sift Resistant Does Not Mean Hermetic
A sift-resistant FIBC should not automatically be described as airtight, waterproof or vapour-tight. Moisture, oxygen, odour or chemical barrier requirements must be stated separately and may require a validated liner film and closure system. Actual product trials can be valuable for very fine or difficult powders.
Sewing Specification
The approved drawing should identify seam locations, stitch construction, thread, filler cord, coating, liner attachment and critical inspection points. Changes to these components can affect containment and performance and therefore require controlled review.
Reference Framework
For non-dangerous goods, ISO 21898:2024 covers FIBC materials, construction, design, type testing, marking, selection and safe use. Electrostatic classification for FIBCs used in hazardous explosive atmospheres is addressed separately by IEC 61340-4-4:2018. Dangerous-goods applications require the applicable transport rules and an approved UN design type. The final approved specification and handling label govern the supplied FIBC.
Complete the specification form and send it to info@elayplastic.com.