Bentoswell Expanding Concrete Joint Waterstop｜ Other Products

OCM Bentoswell is a flexible concrete construction water swelling strip that expands upon contact with moisture, creating a positive seal in concrete joints.
Made from a special blend of butyl rubber polymers and bentonite clay, it provides superior expansion characteristics and replaces passive PVC dumbbell water stops, eliminating the need for seam welding and split forming.
Key Features

Provides permanently flexible, watertight joints
Quick and easy to install without requiring skilled labor
Excellent adhesion to clean, dry surfaces when used with Bentoswell Primer
Sealed joints will not shrink, harden, or oxidize over time
Cost-effective and reliable sealing solution for cast-in-place concrete joints

Limitations

Bentoswell is not self-adhering and requires Bentoswell Primer for proper adhesion
A minimum of 3” (75mm) of concrete coverage is required to prevent premature expansion
Should not be exposed to water before concrete is poured
For use in contaminated groundwater, contact an OCM representative for compatibility information

Specifications

Specific Gravity (ASTM D71): 1.60

Hardness (ASTM D217): 75 dim

Solids Content (ASTM C681): 100%

Unrestricted Swell: 300%

Hydrostatic Head Resistance: 231 ft (70m)

Applications

Cast-in-place applications
Slabs-on-grade foundations
Storage tanks and utility vaults
Pipe penetrations and tunnels
Box culverts and retaining walls
Concrete and burial vaults
Septic tanks

Installation Instructions

Clean the surface to remove dirt and loose particles.
Apply Bentoswell Primer in a 1/4” minimum thickness using a brush or trowel.
Remove the release paper and press Bentoswell firmly onto the primed surface within 30 minutes.
Butt coil ends tightly together without overlapping. Cut as needed with a knife or utility blade.
Once installed, proceed with pouring concrete.

Product Variants

OCM Part #
Description
Box Qty
Weight

BS-1001R
3/4” x 1” x 16’ 8” Rolls (6 Rolls per Carton)
100 LF
51 lbs.

BS-1001T
1/2” x 1 1/4” x 20’ Rolls (6 Rolls per Carton)
120 LF
44 lbs.
Brand:OCMSKU:BS-1001RTags:Construction SuppliesProfile Shape:Rectangle, Trapezoid