Sika BentoShield MAX LM, a fully-bonded, needle-punched membrane and integrated polyethylene flexible laminate, represents a unique offering.
Bentonite, a clay substance which is often generated from the alteration of volcanic ash, is renowned for its water absorption. These properties make it a valuable material for a wide range of uses and applications, particularly as a waterproofing material in construction of belowground structures such as basements.
Sika BentoShield is a polymer-modified product, which is applied to external surfaces of belowground structures exposed to ground water, is the only bentonite system that’s BBA-approved to BS EN 1928:2000 standard relating to flexible sheets for waterproofing.
The sealing technology of Sika BentoShield MAX LM combines the superior swelling performance of the sodium bentonite with high strength polypropylene geotextiles. The two geotextiles are interlocked by a needle-punching process forcing fibres from the non-woven layer through and beyond the woven layer.
Sika BentoShield MAX LM is designed for use in below ground construction. It differs from other BBA-accredited geosynthetic clay liners as it contains specially formulated polymers to enhance performance in contaminated land with a high salt concentration. As well as basements, it is used in cut-and-cover tunnels, backfilled walls and in a variety of more demanding applications, depending on whether water is to be kept in or out.
The seams for vertical applications of many bentonite membranes are vulnerable to failure. Sika BentoShield MAX LM laps, however, are sealed with a tape to provide a watertight solution as well as protect against debris and water intrusion during backfilling the system.
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