Rubber Expanding Bentonite Waterstop for Concrete Joint Water Swelling Waterstop Bar

Product Description

Product Description

is a new type of watertight sealing strip made mainly of hydrophilic polymers (e.g., super-absorbent resin or modified rubber). Inside the material are a large number of hydrophilic groups (carboxyl, hydroxyl, etc.). On contact with water, osmotic pressure, hydrogen bonding and chain-unfolding make the strip swell rapidly to 2–6 times its original volume, forming a gel-like elastic body that plugs the leakage paths in concrete construction joints, deformation joints or around wall-penetrating pipes, thus realizing a "stop-water-with-water" seal.
Main types
    *: usually rectangular, soft and self-adhesive, swelling 150 %–300 %, suitable for irregular gaps or post-construction repairs.
    *: vulcanized and shaped, with better rebound and compression resistance, swelling 150 %–600 %, widely used in new underground works, tunnel segments and other long-term pressure locations.

Key properties
    *Swelling pressure 0.5–1.5 MPa, establishing a dynamic balance with groundwater pressure.
    *Swelling rate can be adjusted (slow-swell type ≤ 50 % of maximum within 186 h), preventing displacement before concrete pour.
    *Ageing-resistant, non-toxic, no leachate, stable after long immersion.
    *Self-adhesive or nail-fixed, easy to install, capable of self-sealing micro-cracks caused by subsequent settlement.

Features & benefits:

*Quality sodium bentonite clay and rubber materials.
*Moisture activated.
*Strong, durable with high cost effectiveness.
*High water absorption with excellent compression seal.
*High expansion control ability for preserving its integrity.
*Controlled internal pressure in surrounding concrete to avoid spalling and cracks.
*Withstand high water pressure.
*Capable to self-healing.
*Easy and fast to transport and install.
*Easy to joining.
*Non toxic

Sizes:

    *Width: 10 mm, 15 mm, 20 mm, 30 mm, 40 mm, 50 mm.
    *Height: 10 mm, 20 mm, 30 mm, 25 mm, 40 mm, 50 mm, 60 mm.
    *Color: black, red and other colors also can be customized.
    *Note: Other specifications also can be customized.

All Types of Waterstops to Prevent Liquid Leaking
Waterstop plays an important role in waterproofing a concrete structure, especially joints, the weakest part which is liable to leakage of water or chemical liquids. So waterstops are designed as a fluid-tight diaphragm embedded in or running along the joints to solve these problems. Manufactured from various materials in a range of shapes and sizes, the waterstops are perfect for various types of applications as shown below:

Specification

Bentonite Waterstop Strip Parameters

NO.	ITEM	Result
		PN-150	PN-220	PN-300
1	Expansion rate/%≥	150	220	300
2	Flow at High Temperature (80℃×5h)	No fiow	No fiow	No fiow
3	Low temperature test (-20℃×5h)	No crack	No crack	No crack
4	Peel strength	0.05MPa
5	Shear Strength	1.0MPa
6	Hydrostatic Pressure	1.2MPa

Polymer Waterstop Strip Parameters

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

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

Q1:What is the expansion rate of the water stop?
A:The expansion rate ranges from 150% to 600% depending on the specific model selected.

Q2:How fast does it swell?
A:Initial swelling begins within minutes, full expansion in 24-48 hours.

Q3: What water pressure can it withstand?
A:Withstands hydrostatic pressure up to 2.5 MPa (25 bar) once fully expanded and confined within the joint.

Q4: Does it have self-healing properties if damaged?
A:Yes, bentonite re-swells upon re-wetting, self-sealing minor cracks or punctures automatically.

Q5: What are the available sizes?
A:Standard sizes include 10x20mm, 15x20mm, 20x25mm, 20x30mm, and 30x40mm.

Q6: How is the bentonite waterstop strip installed?
A:Simply fix with adhesive backing or nails to the concrete joint surface; no heat, welding, or special tools required.

Q7: Can the product be customized?
A:Yes, we offer full customization including size, color, shape (P-type, round), and expansion ratio.