A flexible hydrophilic natural rubber & bentonite waterstop
for construction joints and sealing precast elements that
expands on contact with water. The bentonite in consists of tightly
packed charged microscopic platelets, between and within
these platelets there is a separation of charges positive
and negative. Water molecules are attracted to the unique
structure of positive and negative charges and wedge
themselves between the platelets causing them to separate
& swell. The hydrated bentonite forms a seal preventing further
migration of water. As hydrostatic pressure is increased the
platelets compact forming a tighter sea Polyurethane Injection Foams

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