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Everlastic® SBR/Neoprene Rubber Waterstop


Williams SBR Hi-Tensile Rubber Waterstop.

Williams Neoprene Hi-Tensile Waterstop.



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 Everlastic� Waterstop System since 1954.  Joints in concrete structure, on one side of which is subject to hydrostatic load, are generally provided with waterstops bridging joints and embedded in 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 to resisting hydrostatic pressure.

Rubber Waterstops will elongate over four times original size (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 precise waterstop alignment.  Fittings are manufactured from the same elastomers/polymers as the waterstop.




Sewer plants, water filtration plants, aqueducts, resevoirs, locks, tanks, channels, swimming pools, culverts, tunnels, underpasses, bridge decks and abutments, roofs, dams, foundations, mineshafts, retaining walls and any concrete structure requiring watertight joints.




The Dumbell Waterstop is adequate for all vertical and horizontal stress across the joint in the same plane as the waterstop.  6" Dumbell Waterstop is adequate for all vertical and horizontal construction joints.  6" Dumbell is also used on expansion joints up to 1".  9" and 12" Dumbell 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 cannot be used.




SBR (Styrene Butadiene Rubber) is the industry standard and 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.




Williams SBR Hi-Tensile Rubber Waterstop meets Williams Products, Inc. specification 2010 and exceeds U.S. Army Corps of Engineers specification CRD-C 513-71 (complete) and specification CRD-C 513-74 (less ozone) and contains 100% neoprene polymer.  Waterstops and fitting are manufactured in accordance with the Rubber Manufacturers.




Nuclear Standards:  Williams Products 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 ContractorsWilliams Products SBR Hi-Tensile Waterstops are currently being installed at numerous nuclear power plants.


Physical Properties

Physical Property

ASTM test Method Williams Spec. 2010 Hi-Tensile (SBR) Styrene Butadiene Williams Specification 1025 Hi-Tensile Neoprene
Tensile Strength, min (PSI) ASTM D412-02 2500 PSI* 2500 PSI*
Ultimate Elongation, min (%) ASTM D412-02 450 450
Hardness, Shore A durometer ASTM D2240-81 65 +/-5% 65 +/-5%
Tensile Stress min PSI to produce 300% elongation ASTM D412-02 1150 1150
Water Absorption, Max % by weight after immersion 7 days at 73.4 degrees F +/- 2 F ASTM D471-98 5 5
Compression Set, max % after 22 hours at 158 degrees F. ASTM D395-02 Method B 30 30
Tensile Strength after aging, min % of original after 7 days in air at 158 degrees +/- 2 degrees F, and 300 PSI ASTM D572-99 80 80
Specific Gravity ASTM D1817-01 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) ASTM D1149-99 no cracks no cracks
Tensile set, % max after 200% elongation for 10 min at 23 degrees +/- 1 degree C      
*3000 PSI from Test Sheets.




Waterstop is joined with Williams Sleeve Type Fittings and Williams No. 37 A  adhesive. 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.




Availability:  Comprehensive stocks are carried at all times assuring shipment, in most cases within 24 hours of receipt of order.

Williams Hi-Tensile Rubber Waterstop Table


3366-3 6" Dumbell* SBR
3327-3 6" Dumbell NEOPRENE
3096-3 9" Dumbell SBR
3416-3 9" Dumbell NEOPRENE
3126-3 6" Centerbulb SBR
3699-3 6" Centerbulb* SBR
3299-3 9" Centerbulb* SBR
3225-3 9" Centerbulb NEOPRENE
* Slit Waterstop also in this size.



Specify Hi-Tensile SBR or Hi-Tensile Neoprene


6" DB 9" DB 12" DB 6" CB 9" CB
Union 6DB-U 9DB-U 12DB-U 6CB-U 9CB-U
Vertical Ell 6DB-VE 9DB-VE 12DB-VE 6CB-VE 9CB-VE
Vertical Tee 6DB-VT 9DB-VT 12DB-VT 6CB-VT 9CB-VT
Flat Ell 6DB-FE 9DB-FE 12DB-FE 6CB-FE 9CB-FE
Flat Tee 6DB-FT 9DB-FT 12DB-FT 6CB-FT 9CB-FT
Flat Cross 6DB-FC 9DB-FC 12DB-FC 6CB-FC 9CB-FC

Cost:  The variety of materials and sizes and changes in raw material prices prevent anything but a general indication of cost range.  Depending on material, quantities and job locations, prices may start under $2.00 per lineal foot and end near $10.00 per lineal foot.



Williams Products, Inc. will replace any unused waterstop materials which prove defective in workmanship or material within one year from date of delivery to buyer.

Because we cannot anticipate or control the many different conditions under which this information and our products may be used, we do not guarantee the applicability or accuracy of this information or the suitability of our products in any given situation.  Users of our products should make their own tests to determine the suitability of each such product for their particular purposes.  The products discussed without warranty, either expressed or implied, and buyer assumes all reponsibility for loss or damage arising from the handling and use of our products, whether done in accordance with directions or not.  Also, statements concerning the possible use of our products in the infringement of any patent.



Complete technical services are available.  Use the toll free number for any technical concerns or needs from the available technical staff at Williams Products, Inc.

Please contact us by;  
Phone:  Toll Free 800-521-9594    or      248-643-6400
Fax: 248-643-7117
Rubber, Neoprene, Foam, Gasket, Seal, Construction. To the best of our knowledge this published information is accurate, however, to determine suitability of material/product for a specific application is the user's responsibility.  Williams Products, Inc. shall not be liable for any loss or damage resulting from inappropriate usage.
Everlastic® is a registered trademark of Williams Products. All other products mentioned are registered trademarks or trademarks of their respective companies.
Contact Williams Products: Phone: 800-521-9594 or 248-643-6400 or Email:  Contact Information