Modifications and re-work

With having a UK manufacturing operation we can provide additional facilities for modifications and re-works to your existing bags. Have you had a consignment of bags delivered from your existing supplier which does not quite meet your expected specification?
We can help rectify these "unintentional" mistakes or Add an ID panel.

Money saving modifications

We have saved some of our customers the inconvenience and added expense by undertaking the following modifications

  • Printing errors (blanking out, adding an over print and much more).
  • Conversion of filling and discharge spouts, added designs to suit your requirements, including addition of document pockets extra webbing etc.
  • Improvement to dust proof seams.

Because we have a manufacturing unit in the UK we are able to convert your bags as above, we can also add extra webbing, Document Pockets, Printed side panels and much more.

So if you have a problem with your bags (they may have been rejected) we can work with you to rectify that unintentional mistake!

Specialist Bags

Unlike our range of stock FIBC’s, Centurion Packaging are also able to supply bespoke bulk bags produced to customer specifications. In doing so, we are able to satisfy a diverse range of needs by incorporating added value features into the design of the bag, features which are not present in the range of stock FIBC’s

Food Grade

FIBC’s are produced in a food grade environment and are suitable for the bulk packing of products like sugar, freeze dried coffee, milk powder, nuts and pulses, etc.

All thread ends are heat sealed to prevent them from becoming detached and contaminating the contents
All hems sewn externally to separate them from the contacts
Exposed ends of fill and discharge spouts hemmed
Only coated fabric used to assist with keeping the contents separated from the outside world.
PE food grade liners; straight or shaped; tabbed or glued into the bag to prevent the liner from discharging with the product

Many powdered chemical products need to be shipped in UN certified FIBC’s. This helps to prevent accidents which may cause damage to people, property and the environment. Centurion Packaging UN certified FIBC’s have been designed tested and manufactured to UN regulations, with additional tests including stacking tests, righting tests, topple tests, and drop tests. All UN certified FIBC’s are printed and labelled with the appropriate UN markings.

Types B, C & D FIBC’s

Certain products are susceptible to ignition when being filled or discharged and an explosive atmosphere around such products can present high risks when handling them. Centurion’s Type B, Type C & Type D FIBC’s are designed to reduce the risk of electrostatic ignitions when filling and discharging.

Type A FIBC’s

Unless otherwise specified, all FIBC’s will be classified as Type A. These FIBC’s offer no protection against electrostatic discharges.

Type B FIBC’s

Offer protection against ‘brush discharge’ and breakdown voltages up to 6kv. They do not require earthing.

Type C FIBC’s

Require earthing when filling and discharging. Type C FIBC’s display a chequered pattern within the fabric which comprises conductive threads. These conductive threads are interlinked and connect to earthing tabs positioned around the bag. It is imperative that these earthing tabs are ‘grounded’ using crocodile clips and an earthing system to safely fill and discharge the bag. Type C bags must be used for certain flammable products and/or in the presence of flammable vapours with an ignition energy >0.14mJ.

Conductive threads are produced either from carbon, or in the case of food grade FIBC’s, silver, although today Acetylene Black (carbon) may also be used which is food grade approved. Each individual bag is electrostatically tested to IEC 61340-4-4 Standards.

Type D FIBC’s

Type D FIBC’s perform a similar function to Type C FIBC’s but without the need for earthing during filling and discharge. The conductive tapes within the fabric form individual and isolated ‘circuits’ and static charges are dissipated using the corona effect. Similar to Type C FIBC’s, Type D’s offer protection against flammable products and/or in the presence of flammable vapours with an ignition energy >0.14mJ.

Sift Proof FIBC’s

Many powdered products are so fine in their consistency that they will leak through the seams of a standard bulk bag where the sewing needles have passed through. To prevent this, stuffer cord can be sewn into the seam to seal up the stitch holes after the needle has passed through. Coated fabric is always used to prevent the product escaping through the wall of the fabric, and dust seams can be either single (on one side of a seam only) double (on both sides of a seam) or triple (on both sides of the seam, and between the layers of fabric being sewn together). Similarly, dust seams can be used on all seams of a bulk bag, or just on the load bearing seams where leakage is most likely.


Some products are so fine that they behave almost like liquids, and even a coated fabric sift proofed bag will not prevent leakage through the seams. In these instances it is necessary to use a PE liner within the FIBC. Liners are produced slightly larger than the FIBC they are fitted into so that the outer bag bears the weight of the product and not the liner itself.

The most basic liners are straight/gusseted and are loosely inserted into the bag. They may also be shaped at the top and bottom to give a better fill and discharge, preventing the excess material of a straight liner congesting the fill and discharge spouts of the bag. To prevent liners from discharging with the contents of a bag, liners can be tabbed in at the 8 corners of the bag, or fully glued into the bag.