Three levels of barrier
PE standard liner
General-purpose low-density polyethylene film, heat-sealed into a flat tubular or sheet form. A basic moisture and dust barrier at low cost — for common chemicals, agricultural products and mineral granules that do not need high barrier performance.
PE form-fitted liner
Custom-shaped to the FIBC dimensions, produced by blow moulding or seamless contour cutting with zero or minimal side seams. It fits snugly against the inner wall, eliminating stress points and significantly improving leak and moisture resistance for fine powders.
Aluminium foil form-fitted liner
A form-fitted PE structure laminated with aluminium foil. Adds superior oxygen, moisture and UV-light barrier to the close fit — the highest protection level, preventing oxidation, moisture degradation and aroma loss in fine chemicals, food additives and pharmaceutical raw materials.
Which liner for which powder
| PE standard | PE form-fitted | Foil form-fitted | |
|---|---|---|---|
| Shape | Flat tube / sheet | Matches bag interior | Matches bag interior |
| Seams | Heat-sealed edges | Zero / minimal side seams | Zero / minimal side seams |
| Moisture barrier | Basic | Strong | Excellent |
| Oxygen barrier | Low | Moderate | Excellent |
| Light barrier | None | Low | Excellent |
| Typical material | Chemicals, minerals, grain | Fine powder, ultra-fine powder | Cathode / anode powder, additives, pharma |
| Compatible bag types | Type A / B | Type A / B | Type A / B |
The standard L-series in our catalogue
The same logic appears in our production catalogue as five fixed builds: L1C aluminium foil, L1 conductive PE, L2 anti-static PE, L3 standard PE, and L3 PE baffle liner (form-fitted with matched baffles). The first four are normally paired with Type A / B bodies; conductive and anti-static variants are selected to the static class of the outer bag.
