Waterproof Water Swelling Waterstop Strip Red/Black Expandable Bentonite Waterstops

Product Description

Product Description

Solutions To Water Containment Needs - Bentonite Waterstops
is a rubber strip made from sodium bentonite and elastic rubber that expands on water contact to seal construction joints. Embedded in the joint groove, the strip absorbs groundwater and presses tightly against both concrete faces, closing the seepage path where settlement movement occurs. The strip stays flexible through wet and dry cycling in buried service. It is installed in basement walls, retaining pits, subway tunnels, culverts and water tanks.

Product Advantages

 * Custom profiles and coil lengths are tooled to match each joint groove dimension.
 * Sodium bentonite loading stays uniform along the strip for even swelling at every point.
 * Elastic rubber body bends around corners and pipe penetrations without cracking during fixing.
 * Swelling pressure builds against both concrete faces to close gaps left by settlement.
 * Cut and joined on site with hand tools, so no special equipment is needed.

Product Functions

 * Absorbs groundwater on contact and swells to fill the joint gap tightly.
 * Blocks water seepage paths that pass through the construction joint and wall section.
 * Maintains sealing pressure while the joint opens and closes in service.
 * Bonds mechanically to both concrete faces after swelling begins under sustained water contact.
 * Forms a compressible sealing barrier that tolerates minor joint movement and settlement.

Installation & Precautions

Product Applications

 * Clean the joint groove and remove loose aggregate, dust and standing water.
 * Centre the strip in the groove and fix it with adhesive or concrete nails.
 * Keep the strip continuous; overlap and press butt joints tight before pouring.
 * Pour concrete in layers and vibrate away from the strip to prevent displacement.
 * Do not stretch the strip along its length during fixing or alignment.

 * Basement walls and raft slabs of residential and commercial buildings with high groundwater.
 * Retaining pits and diaphragm wall joints in deep excavation and foundation works.
 * Subway tunnels and underground utility galleries built by shield or cut and cover.
 * Culverts, box drains and water tanks where groundwater contact stays constant all year.
 * Construction joints in sewage treatment plants and other water retaining structures of civil works.

Specification

Physical properties		PZ-150	PZ-250	PZ-400	PZ-600
Hardness (shore A)		42±7	42±7	45±7	48±7
Tensile strength		3.5 Mpa (min)	3.5 Mpa (min)	3 Mpa (min)	3 Mpa (min)
Elongation		450% (min)	450% (min)	350% (min)	350% (min)
Expansion rate		150%	250%	400%	600%
Repeated water immersion test	Tensile strength	3 Mpa (min)	3 Mpa (min)	2 Mpa (min)	2 Mpa (min)
	Elongation	350% (min)	350% (min)	250% (min)	250% (min)
	Expansion rate	150%	250%	300%	500%
Low temperature bending (-20°C*2h)		No crack	No crack	No crack	No crack

Installation

Company Profile

Hengshui Jingtong Rubber Co., Ltd., located in Hebei Province's Hengshui City, is a professional manufacturer of engineering rubber products. Our product range includes bridge bearings, expansion joints, water stop strips, water stop belts, inflatable cores, building deformation joint device and water plugs, which are widely used in bridge, tunnel, water conservancy, and power engineering projects. The company boasts advanced technology and mature processes to ensure reliable product quality.

We have a professional technical team and a comprehensive after-sales service system to ensure customers receive high-cost-performance products and attentive service. Hengshui Jingtong Rubber Co., Ltd. is committed to continuous innovation to meet market demands and looks forward to esta blishing long-term cooperative relationships with customers from both domestic and international markets.

FAQ

1.What materials are used in the waterstop strip?

A:The strip is made of sodium bentonite and natural rubber.

2.How much does the product expand when wet?

A:The expansion rate ranges from 150% to 600% depending on the model.

3.Is the size customizable?

A:Yes, sizes are available in standard options like 10x20mm or fully customized.

4.Can the color be customized?

A:Yes, colors include Red, Black, Blue, or fully customized options.

5.Do you offer OEM and ODM services?

A:Yes, we provide full customization from samples, designs, and minor adjustments.

6.What is the lead time for production?

A:Lead time is within 15 workdays for both peak and off-peak seasons.