Multi-layer COEX technology The engineering safety barrier for pesticides and active solvents
A 5-layer structure reduces oxygen and solvent permeation by up to 99.9% and preserves active-ingredient stability under demanding storage conditions.
Oxygen and gas isolation
An integrated EVOH barrier prevents solvent and pesticide permeation.
Integrated wall structure
Multi-layer protection from high-density virgin polymer.
Zero paneling
Structural engineering resistant to negative pressure and temperature change.
Extended shelf life
Protects pesticide and fertilizer active ingredients from oxidation and leakage.
Interactive layer anatomy viewer
Illustrative layer sequence; the drawing is not to scale and thicknesses follow the container specification.
Layer 1: outer high-density polyethylene (Outer HDPE)
External protection against impact, UV radiation and abrasion during transport and storage.
Zero-paneling engineering (Zero Paneling)
Zero Paneling means preventing the wall from collapsing inward after filling or during thermal storage. It is achieved by balancing layer thicknesses and bond strength between HDPE and EVOH, with supporting shoulder geometry that distributes stress.
The result: a stable container shape, no volume loss and improved logistics safety during stacking and long-distance shipping.
Inside the COEX bottle (COEX 5-Layer Anatomy)
An illustrative cross-section of the one-litre bottle wall showing the five layers, with an enlarged side detail of their structure.
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1
HDPE outer Outer HDPE
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2
Tie layer Tie Resin
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3
EVOH barrier EVOH Core
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4
Tie layer Tie Resin
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5
HDPE inner Inner HDPE
Solvent permeation test matrix (Solvent Barrier Matrix)
| Solvent | Monolayer HDPE | Multi-layer COEX | Barrier rate |
|---|---|---|---|
| Xylene | High permeation | Excellent stability | 99.9% |
| Solvesso 100 | Noticeable volatilisation | Stable barrier | 99.8% |
| Solvesso 150 | Gradual degradation | Long-term protection | 99.7% |
| Cyclohexanone | Surface interaction | High isolation | 99.6% |