Swelling tape which consists of sodium bentonite, embedded in a matrix of nonvulcanized
rubber
as
binding
agent.
In
contact
with
water
develops
volume
by
swelling
up
to
270%.
As
a
result
it
seals
and
waterproofs
the
joint
gaps
permanently.WATERSTOP 1520 is used to underground constructions for sealing horizontal or vertical connection joints to concrete elements. Also it can be used for sealing conjunction joints (e.g pipes through concrete walls etc.).