Bentonite waterstop MASTERSTOP "LONG TIME"
coated bentonite swelling tape

article number 010012

Bentonite waterstop

CE Water pressure test

for the weather independent installation

Dim: 25 x 20 mm, colour black

coated bentonite swelling tape

General Building Supervisor Board Certificate

CE label

available in large quantities

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article number:
customs tariff number:
packing unit:
sales quantity unit:
30 m
weight per:
cart = 23.1 kg

sodium bentonite





increase in volume:

up to 300%, in normal water (pH 7)
up to 120%, in liquids that are highly aggressive to concrete
up to 220%, in alkaline liquids

test certificate/ approval:

Euopean Technical Assessment

ETA -16/ 0735 of 13 September 2017


rain protection:

approx. 10 days ( not permanently in in-situ water)

dissolving of protective film:

approx. 6-7 days after placement of concrete

suitable for zones with frequently varying water levels:


corresponds to:

 utility class A for the wear classes 1 and
 2 in accordance with the WU guideline



  •  Alkalis in general
  •  Urea
  • Liquid manure and slurry
  • Biogas
  • Radon
  • De-icing salt
  • Substances obtained by means of
  • fermentation
  • Substances obtained by means of composting
  • Waste water in water treatment plants

Further resistances are available on request


size: 25 x 20 mm
30 m per carton
6 rolls of 5 m each 
36 cartons per pallet

thermal scope of application:
ca. -30° C up to +90° C
up to max. 5 bar ( 50 m watercolumn)
Store in undamaged and unopened original packaging in a dry place out of direct sunlight.
Can be disposed of at municipal waste landfill sites, taking into account the local waste disposal regulations.

Since the MASTERSTOP "LONG TIME" is supplied with a protective sheating, the swelling tape can
only be fastened by using a special swelling tape grid.
The substrate must be clean, dry and free of loose parts.
Apply the MASTERSTOP "LONG TIME" in the middle of the joint to the concrete surface and fix it.
The later concrete cover must be at least 8cm.
The swelling tape must be bordered by reinforcement on both sides.
Minimum distance to the reinforcement: 5cm.

coated waterstop Masterstop longtime installed with swelling tape grid (sketch) | © Mastertec GmbH & Co. KG

Place the swelling tape grid carefully over the swelling tape without damaging the protective sheating.

The grid must only be nailed on through the side wings.

Fasten with suitable nails either by hand or mechanically with a bolt-firing tool.

The distance between nails should not exceed 25 cm in the longitudinal direction of the swelling tape.
At the beginning of the tape and if tape sections are used, pull back the protective sheating approx. 5 cm, cut off the swelling tape and fold over the extra length of sheating to prevent contact with water.

In the corners, the swelling tape grid must be released in order to ensure a continuous firm fixation on the substrate.
In the case of butt joints in the straight line and the use of swelling tape grids, the joints of swelling tape and swelling tape grid should always be made in a staggered position.

MASTERSTOP LONG TIME in precast wall

Download DWG

Download PDF

MASTERSTOP LONG TIME in in-situ concrete

Download DWG

Download PDF


Download DWG

Download PDF


suitable accessories

swelling tape grid "Long Time"

Dimension: 20 x 25 mm length: 1 m ...

Nails for bolt-firing tool

length: 42 mm with big washer ...

Nails for manual fastening

length 40 mm with washer carton contains 250 pieces ...

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