Rubber Waterstops - SBR, Neoprene Or Natural Rubber

Rubber waterstops are most widely used type for concrete constructions.

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Rubber waterstop, made of quality SBR (styrene butadiene rubber), neoprene rubber or natural rubber, is one of the widest types for concrete structure to prevent liquid leaking in or out. Generally, designed to be cast in the concrete, rubber waterstops are ideal for applications where high physical properties of rubber are required. For example, reservoirs, dams and other water retaining or excluding applications with high movements or water pressure.

Features & benefits

• High elasticity. 
• High elongation.
• Excellent high movement accommodation.
• Capable to withstand high hydrostatic head.
• Adjust for subsidence and seismic movements.
• Hot vulcanized site joints.

Applications:

• Ideal for high movements joints.
• Water containments.
• Water excluding.
• Tunnels and civil engineering structures.
• Water and waste treatments.
• Dams, reservoirs, and spillway.
• Chemical areas. 
• Irrigation canals, sea walls and culverts.

Main types:

• Dumbbell type

  Dumbbell type water stops, with flat web section, are ideal for construction and partial contraction joints with little or no movements.

• Center bulb type

  Center bulb type waterstop, as its name implies, features its center bulb which makes it ideal for contraction and expansion joints including high lateral, transverse and shear movements. Meanwhile, it is perfect for withstanding the subsidence of the joints.

Center bulb type rubber waterstop.

Dumbbell type rubber waterstop.

Rubber waterstop - dumbbell type.

Rubber waterstop &#; center bulb type.

As your request, other types including ribbed type, splitting type, base type or capping type can be made to your order.

Installation:

All the rubber waterstops are designed to cast in the concrete as an integral joint sealing system. Pre-fabricated waterstops are also supplied to reduce site jointing.

Materials properties

SBR and neoprene rubber, as the most common materials for rubber waterstop manufacturing, are used extensively in United States and the worlds. The SBR water stop is preferred for water containment, while neoprene rubber waterstops are recommend for applications of sewage disposal or chemical industries. As your request, natural rubber, EPDM, Nitrile and Silicone waterstops are also available.

Hengyang Product Page

Physical properties Test methods SBR High tensile neoprene rubber Natural rubber Water absorption 2 days at 70°C (% change) ASTM D-471 5% (max) 5% (max) 5% (max) Hardness shore A ASTM D- 65 65 65 Tensile strength ASTM D- 412 psi (min) psi (min) psi (min) Tensile strength at 300% Modulus ASTM D-412 psi (min) psi (min) psi (min) Ultimate elongation ASTM D-412 450% (min) 450% (min) 500% (min) Compression set 22 hours at 70°C (% original deflection) ASTM D-395 30% (max) 40% (max) 30% (max) Accelerated aging 96 hours at 70°C (% of tensile strength before aging) ASTM D-573 80% (min) 80% (min) 80% (min) Accelerated aging 96 hours at 70°C (% of elongation before aging) ASTM D-573 80% (min) 80% (min) 80% (min) Ozone resistance 7 days at 50 PPHM at 70°C, 20% elongation ASTM D- No crack No crack No crack

Rubber water stops are manufactured from natural and synthetic rubber with many additives and fillers through the processes of plasticization, mixing, and compression molding.

It can be used in different types of concrete joints to prevent water leakage and infiltration.

Rubber water stops must have high elasticity and be highly resistant to abrasion, corrosion, aging, and tearing.

It must be adaptable to deformation very well and is resistant to water.

It is suitable for the temperature range of -45°C to +60°C. Rubber water stops cannot be used when the temperature exceeds +70°C and in conditions where rubber water stop is oxidized or corroded seriously by organic solvents.

Rubber water stops can be divided into many kinds according to materials, such as natural rubber water stops, neoprene water stops, nitrile rubber water stops, and EPDM water stops. EDPM stands for ethylene propylene diene monomer rubber.

Examples &#;

Ribbed with center bulb rubber water stop Dumbbell with center bulb rubber water stop

Rubber water stops of different materials are suitable for different conditions.

They are widely used for various concrete structures, such as bridges, dams, tunnels, culverts, storage tanks, and wastewater treatment plants.

Application of rubber water stops

Used for moving joints and non-moving joints &#; such as construction joints, settlement joints, deformation joints, and movement joints,

• to prevent water seepage and leakage,
• to absorb shock,
• for portable water tanks,
• used for dams, bridges, tunnels, culverts, and canals,
• used for water and sewage treatment plants,
• used for retaining walls,
• used for foundation, basement, subway, dam, canal, water reservoir, aqueduct, tunnel, culvert, parking deck, bridge deck, abutment, elevator pit, roof, floor slab, swimming pool, road embankment, underground facility, stadium, storm drain, etc.

An example of placing rubber water stops

Dumbbell and ribbed center-bulb water stops should be positioned so that the water stop&#;s longitudinal centerline aligns with the joint&#;s center.

Several manufacturers recommend positioning the water stop such that it covers at least half of the concrete&#;s width.

To avoid poor concrete consolidation caused by aggregate bridging, a minimum of two times the greatest aggregate size should be allowed between the water stop and reinforcing steel.

Concrete must be put with care so that the water stop remains in the intended place.

During the first half of the concrete placement, the water stop must be properly held in place, with one-half of the width immersed in the concrete.

If you want to learn more, please visit our website Rubber Water Stopper.