Williams SBR Hi-Tensile Rubber
Williams Neoprene Hi-Tensile
Special Compounds Also Available
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Basic Use: "A Waterstop is usually a section of flexible waterproof
material placed at any joint in concrete to prevent the passage of water." Williams
Products, Inc. has been a pioneer supplier to constructors with the Williams Everlasticā
Waterstop System since 1954.
Joints in concrete structures, one side of which is subject to hydrostatic load, are
generally provided with Waterstops bridging the joints and embedded in the concrete on
either side. In concrete joints where expansion and contraction cause the joints to close
and open, the Waterstop must be designed to accommodate itself to movement. The primary
reason for specifying Rubber Waterstops rather than metal or PVC is their superior
performance in withstanding shear movements and resisting hydrostatic pressure.
Rubber Waterstops will have ultimate elongation of 450% (ASTM D 412-75) and will continue
returning to near original shape after repeated movement. They have very low compression
set and perform well at low temperatures.
The Williams System features sleeve type fittings that provide fast positive splicing and
Waterstop alignment. Fittings are manufactured from the same elastomers/polymers as the
Typical installations include: sewerage plants, water filtration plants, aqueducts,
reservoirs, locks, tanks, channels, swimming pools, culverts, tunnels, under-passes,
bridge decks and abutments, roofs, dams, foundations, mine shafts, retaining walls and any
concrete structure requiring watertight joints.
Limitations: The dumbbell design is intended to be used where there
is primarily horizontal stress across the joint in the same plane as the waterstop.
6" Dumbbell waterstop is adequate for all vertical and horizontal construction
joints. 6" Dumbbell is also used in expansion joints of up to 1". 9" and
12" Dumbbell is used in expansion joints of 1" to 2". 6" Centerbulb is
used in expansion joints up to 1" where shear movement is expected and 9"
Centerbulb is used in expansion joints up to 2" where shear movement is expected. The
Centerbulb is hollow so it can deform to absorb shear movements.
Split Waterstops are used for short straight runs only. When Split Waterstops are spread
against forms, connecting unions and corner fitting cannot be used.
Composition and Materials: SBR (Styrene Butadiene Rubber) is the industry
standard and is used in most applications. Neoprene rubber is more expensive and is used
where hostile environmental conditions are present and the Waterstop is exposed to
continuous heavy concentrations of oil, gasoline, sewerage, ozone, ultra-violet rays or
injurious chemicals. Special situations may require special materials and designs. These
are available from Williams Products, Inc.
Applicable Standards: Williams SBR Hi-Tensile Rubber Waterstop meets
Williams Products, Inc, specification 2010 and exceeds U.S. Army Corps of Engineers
specifications CRD-C 513-71 (complete) and CRD-C 513-74 (less ozone).
Williams Neoprene Hi-Tensile Rubber Waterstop meets Williams Products, Inc. specification
1025, exceeds U S. Army Corps of Engineers specification CRD-C: 513-74 and contains 100%
neoprene polymer. Waterstops and fittings are manufactured in accordance with the Rubber
Manufacturers Association Standards.
Nuclear Standards: Williams produces waterstops that conform to the
quality, material and conditions of service (seismic movement, hydrostatic head, and
radiation dosage) standards set forth by the U.S. Atomic Energy Commission, Nuclear
Regulatory Commission and the nuclear power plant contractors. Williams SBR Hi-Tensile
Rubber Waterstops are currently being installed at numerous nuclear power plants world
Waterstop is joined with Williams Sleeve Type Fittings and Williams No. 37
First, cut the waterstop ends square. Brush Williams No. 37
A adhesive onto cleaned, butted
surface of the waterstop and fitting, assemble, hold in place, allow to dry.
Installation of Waterstop involves split forms. In the first pour the waterstop is held in
place with blocks or other suitable arrangements on the outside of the split form (away
from the concrete which is to he poured).
After the first pour has set up, the split forms and block are removed. When the adjoining
pour is made, care should be taken to support the waterstop.
|Typical Physical Properties|
|ASTM test Method
||Williams Spec. 2010
Hi-Tensile (SBR) Styrene Butadiene
Specification 1025 Hi-Tensile Neoprene
|Tensile Strength, min (PSI)
|Ultimate Elongation, min (%)
|Hardness, Shore A durometer
|Tensile Stress min PSI to produce 300%
|Water Absorption, Max % by weight after
immersion 7 days at 73.4 degrees F +/- 2 F
|Compression Set, max % after 22 hours
at 158 degrees F.
||ASTM D395-02 Method B
|Tensile Strength after aging, min % of
original after 7 days in air at 158 degrees +/- 2 degrees F, and 300 PSI
||1.17 +/- .03
||1.17 +/- .03
|Ozone cracking resistance after 20%
elongation for 7 days 0.5 p/m at 38 degrees C (neoprene 3 p/m)
|Tensile set, % max after 200%
elongation for 10 min at 23 degrees +/- 1 degree C
|*3000 PSI from Test Sheets.