Seline®

Sealant

The watertightness of a sheet pile wall essentially depends on the number of interlocks and the interlock geometry. Despite the relatively compact nature of the Larssen interlock, which is a feature of all hot-rolled sheet piles from ArcelorMittal, additional interlock sealants are often used to further reduce water penetration.

Product features

Seline is a completely newly-developed, environmentally friendly sealant for sheet piles from ArcelorMittal. Unlike all other existing sealants, Seline contains a renewable raw material: balsam resin (also known as colophony or gum rosin). This resin is a natural raw material that was used by the ancient Romans and Egyptians. The tree resin is mainly obtained from pine trees by scratching the tree and collecting the balsam that drips out. 

Seline is heated in a similar way to bitumen-based sealants and then filled into the sheet pile interlocks. After briefly cooling down, Seline© provides an extremely reliable water seal for sheet pile walls. 

Seline is ideally suited for temporary and permanent sheet pile wall structures.

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Sealing performance

ArcelorMittal is the only sheet piling supplier with a real-world testing process. At our Mittersheim, France test site, sealed sheet piles were driven into hard clay and tested under DNV/GL supervision. Seline was subjected to:

  • 24 hours at 100 kPa (1 bar)
  • 24 hours at 200 kPa (2 bar)
  • 24 hours at 300 kPa (3 bar)

Results confirmed superior watertightness compared to established sealants. DNV/GL verified these findings, providing reliable performance values. Further tests in 2025 will explore Seline’s behavior in various soils and pile-driving methods.

Environmental compatibility

Seline is a natural product and does not contain any substances that have to be listed in accordance with Regulation (EC) No. 1907/2006 (REACH). 

Like all ArcelorMittal sealing systems/materials, Seline has also been tested by the Hygiene Institute of the Ruhr. The “Ecotoxicological Test” showed that Seline has no relevant ecotoxicological impact potential on the soil and existing groundwater and that from a water hygiene point of view there would be no negative impact on the living environment due to soluble ingredients. Consequently, the HY Institute came to the conclusion that the use can be assessed as etiologically harmless.

Installation recommendation

The filling of the interlocks with Seline in the factory takes place under consideration of the following aspects: 

Interlocks must be clean and dry; the sheet piles must be laid out in a perfectly horizontal position. To prevent the hot product from flowing out, the interlock ends must be sealed with putty.

Seline is heated to processing temperature; stirring ensures the homogeneity of the material; Seline is then poured into the interlocks using a suitable pouring device. 

The driving direction and the position in relation to the water pressure must be observed: The filled interlock must be installed on the side of the water. 

If the piles are supplied as single piles, one free interlock per pile is filled. For double piles the crimped middle interlock and one free interlock are filled. 

Seline is suitable for all sheet pile driving methods (impact, vibration and pressing). The outside temperature should not be below 0°C

AKILA® Sealing System

An environmentally-friendly high performance sealing system developed by ArcelorMittal’s R&D department in Esch-sur-Alzette

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