Waterstop

product-1200-900

Overview

Waterstops are high-performance waterproofing materials engineered to leverage the excellent elasticity and compressive deformation capacity of rubber, plastics, and composite materials. They generate elastic deformation under various loads to form a tight seal, effectively preventing water leakage, seepage, and providing shock absorption in construction structures. Designed for construction joints, expansion joints, and settlement joints-which are necessary due to discontinuous concrete pouring, foundation deformation, or thermal expansion/contraction-waterstops are critical for maintaining structural integrity in large-scale projects.

Widely used in concrete and cast-in-place concrete structures, our waterstops serve key applications including:

Water conservancy projects (dams, culverts, reservoirs, aqueducts)
Transportation infrastructure (tunnels, subways, metro systems)
Municipal engineering (basements, underground facilities, sewage treatment plants)
Industrial & civil buildings (retaining walls, large tanks, precast concrete structures)

I, Classification

Waterstops are categorized by raw material, shape, and installation method to meet diverse project requirements:

1.1 By Raw Material

Type	Key Features	Compliance & Applications
Natural Rubber Waterstop	High elasticity (-35°C to 60°C), Excellent flexibility	ASTM D2000, DIN 53504; Ideal for general waterproofing in non-corrosive environments
Neoprene (Chloroprene) Waterstop	Chemical resistance (weak acids/bases), weather resistance	JIS K6253, BS 2782; Suitable for corrosive or outdoor projects
Nitrile Rubber Waterstop	Oil & fuel resistance	ASTM D412, ISO 37; Perfect for industrial projects with oil exposure
EPDM Rubber Waterstop	Wide temperature range (-40°C to 60°C), ozone/aging resistance	DIN EN 14891, JIS K6385; For extreme weather or long-service-life projects
PVC Plastic Waterstop	Cost-effective, corrosion-resistant, durable	ASTM D638, DIN 53455; Used in medium-to-small dams, tunnels, and culverts
HDPE/EVA/ECB Waterstop	High tensile strength, weldable with waterproof membranes	BS EN 13108; Compatible with modern waterproofing systems

1.2. By Shape & Installation Method

Embedded Waterstop: Core type for expansion/construction joints (e.g., 651, 652, 653 series)

External Paste Waterstop: Welded with waterproof sheets to form the first waterproof barrier on concrete surfaces

Steel-Edge Rubber Waterstop: Composite of rubber and galvanized steel strips for large deformation and high water pressure

Steel Plate Putty Waterstop: Combines putty rubber (high adhesion) with steel plates (rigidity) for structural joints

Steel Plate Waterstop (Waterstop Steel Plate): Cold-rolled steel (2-3mm thick) for basement/wall construction joints

Detachable/Injectable Waterstop: For maintenance-friendly or high-severity leakage prevention

II, Specifications & Dimensions

product-2000-1200

2.1 General Dimensions (Reference for International Standards)

Waterstop Width (mm)	Common Thickness (mm)	Allowable Horizontal/Vertical Deformation (mm)
200	6	≤30
250	6	≤40
300	8	≤50
350	8	≤60
400	10	≤80
450	12	≤100
500	12	≤120

2.2. Specialized Product Specifications

2.2.1, Steel-Edge Rubber Waterstop

Model Code	Width (mm)	Rubber Thickness (mm)	Steel Strip Thickness (mm)	Installation Hole Diameter (mm)
B1	300	6	0.6	3
B2	350	8	0.8	3
B3	400	10	0.8	3
B4	450	10	1.0	3
B5	500	12	1.0	3

2.2.2. PVC Plastic Waterstop Series

Model	Per Meter Weight (kg)	Application Scope
651	3.7±0.3	Medium-to-small dams, tunnels, culverts
652	3.6±0.3	Small concrete structures, channels
653	1.9±0.2	Small buildings, grout stop
654	4.2±0.4	Large dams, reservoirs
831	4.3±0.4	Large-scale concrete projects
861	4.5±0.4	Concrete-faced rockfill dams

2.3,Performance Parameters

All products meet international standards (ASTM, DIN, JIS, ISO) with GB/T 18173.2-2014 as a reference.

2.3.1,Core Performance Indicators

Test Item	Unit	Rubber Waterstop (EPDM)	PVC Waterstop	Steel-Edge Rubber Waterstop
Shore A Hardness	°	60±5	70±5	60±5
Tensile Strength	MPa	≥16	≥12	≥15
Elongation at Break	%	≥400	≥300	≥380
Compression Set (70°C×24h, 25%)	%	≤15	-	≤35
Compression Set (23°C×168h, 25%)	%	≤20	-	≤20
Tear Strength	kN/m	≥30	≥25	≥30
Brittle Temperature	°C	≤-40	≤-38	≤-45
Ozone Aging (50ppm, 20%, 48h)	-	No cracks	No cracks	No cracks
Heat Aging (70°C×168h)	-	Hardness change ≤+8	Strength retention ≥95%	Strength retention ≥80%

2.3.2,Special Performance (Steel-Edge & Putty Types)

Steel-Edge Waterstop: Rubber-steel bonding strength ≥5N/mm (failure in rubber matrix)

Steel Plate Putty Waterstop: Shear strength ≥0.04MPa, initial adhesion ≥Steel Ball No.5, no flow at 150°C×15h

III, Installation Guidelines

Proper installation is critical for waterproofing effectiveness. Follow these international best practices:

1. Pre-Installation Preparation

Store waterstops in a clean, dry environment (-10°C to 30°C, 40%-80% humidity); avoid direct sunlight, heat sources, oils, or corrosive chemicals.

Inspect for defects (cracks, holes, uneven thickness) before use-reject non-conforming products.

2. Positioning & Fixing

Secure waterstops using rebars, specialized clamps, or wire ties; avoid piercing the waterproof core (drill only at edge mounting areas if needed).

For steel-edge waterstops: Position with steel strips facing outward (U-shape installation) and bind to reinforcement nets via mounting holes.

Ensure alignment with joint centers; avoid displacement during concrete pouring.

3. Concrete Pouring

Vibrate concrete gently around waterstops to eliminate air bubbles (especially under horizontal sections).

For steel-edge types: Keep steel strips flat at corners (bend per R-radius requirements) to ensure full contact with concrete.

4. Joint Handling

Prefer factory-fabricated integral waterstops for complex structures (cross, T-joint, circular shapes).

On-site joints: Use heat welding (plastic types) or cold bonding (rubber types) for rubber waterstops; double-weld steel plates (full penetration) for steel waterstops.

5. Post-Installation Protection

Avoid mechanical damage to exposed waterstops during subsequent construction.

For external paste types: Weld firmly with waterproof membranes (EVA/HDPE) to form a continuous barrier.

IV. Storage & Transportation

Transport waterstops in straight, flat bundles; avoid folding, crushing, or sharp impacts.

Store in a well-ventilated warehouse; keep away from ozone generators, solvents, and heavy loads.

Shelf life: 12 months from production date (when stored per requirements).

V, Quality Assurance

Our waterstops are manufactured under ISO 9001 quality management system and comply with:

International Standards: ASTM (USA), DIN EN (Europe), JIS (Japan), ISO (Global)

Reference Standard: GB/T 18173.2-2014 (China)

Quality control includes:

100% visual inspection (no cracks, bubbles, or eccentric holes; surface defects ≤1mm depth for working surfaces).

Random performance testing (tensile strength, aging resistance, bonding strength) per batch.

Customized testing available upon request (mold resistance ≥Grade 2, chemical resistance, etc.).

VI, FAQ

product-1600-900

6.1,Q: How to select the right waterstop material?

A: Choose based on environment (corrosion, temperature), water pressure, and deformation:

General conditions: Natural rubber or PVC

Corrosive/ oily environments: Neoprene or nitrile rubber

Extreme temperatures: EPDM

High water pressure/large deformation: Steel-edge rubber

6.2, Q: What standards apply to African projects?

A: Most African countries adopt ISO or British Standards (BS); consult local codes for project-specific requirements.

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