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Hydrophilic swell bar waterstop that expands on contact with water
Water Proofing

Hydrophilic Swell Bar

Hydrophilic swell bar that expands 300-700% on water contact, sealing micro-voids to form a flexible, long-term watertight barrier.

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Manufactured under ISO 9001:2015 certified quality systems, built to specification for OEM and infrastructure applications.

Overview

Hydrophilic Swell Bar from Maruti Techno Rubber Pvt. Ltd. is a high-performance waterstop for construction and expansion joints in concrete structures. Made from hydrophilic polymers, it expands 300–700% on contact with water, sealing micro-voids and forming a watertight barrier that adapts to structural movement. Its ability to swell under varying moisture conditions ensures long-term, flexible protection against leakage, even under high hydrostatic pressure. Concrete construction joints can show fine cracks or cavities during the natural curing process. This could cause water to infiltrate into the concrete. In contact with water, Maruti Hydrophilic Swell Bar will swell up to 300% to 700% depending on requirements and design considerations of its initial volume and make the construction water proof and also cavities and fine are efficiently scaled.

How a hydrophilic swell bar seals a joint

The bar is bonded or fixed to the first concrete pour along the joint and cast in by the next pour. When water enters the joint, the hydrophilic polymer absorbs it and expands by 300–700% of its original volume, depending on the grade, pressing against the concrete and closing micro-voids and fine cracks. When the joint dries out, the bar shrinks back, and it swells again the next time water arrives, so the seal adapts to changing conditions over the life of the structure.

Approvals and quality

Maruti's hydrophilic swell bar carries a DMRC (Delhi Metro Rail Corporation) approval and is manufactured under ISO 9001:2015 and ISO 14001:2015 certified systems. See our quality and certifications page for the documents.

Key Features & Benefits

  • Water-Swelling Action: Expands on contact with water to seal joints and block voids, pores, and cracks; expands dynamically to restore sealing capacity with self-healing action—no fastening or injections needed.
  • Pressure Resistant: Performs under high hydrostatic pressure in tunnels, basements, and water tanks.
  • Easy to Install: Fits into joints without special tools or adhesives.
  • Flexible: Absorbs minor movements and expansions.
  • Durable: Withstands aging, weather, and stress for long service life.
  • Resistant: Unaffected by common chemicals and biological agents, provides long-lasting, maintenance-free protection.
  • Safe: Non-toxic, recyclable, and suitable for potable water.

Applications

  • Construction Joints: Seals joints between concrete pours in foundations, basements, and walls.
  • Water Retention Systems: For dams, reservoirs, and tanks under high water pressure.
  • Expansion Joints: Handles movement in buildings and bridges from thermal or load shifts.
  • Tunnels & Underground Works: Provides waterproofing against high water pressure.
  • Precast Panels: Ensures watertight junctions in precast structures.
  • Sewage & Wastewater: Prevents leakage and contamination in pipelines and treatment plants.

Design Elements That Serve Critical Roles

  • Flexible Sheet Format - Easy to install over curves, slope, walls, or joints
  • Multiple Thickness Grades (0.07 to 2.0 mm) - Thinner sheets -  internal use and thicker sheets - aggressive environments (e.g., basements and tanks)
  • Visual Crack Inspection for Cold Resistance - Ensures the sheet will not fail under thermal stress
  • Roll Format - Provides seamless waterproofing over large areas with minimal joints
  • Joint-welding Compatibility - Allows for secure overlap joining via heat welding, ensuring 100% water tightness at seams

Maruti Hydrophilic Swell Bar can be supplied with customer labels and required color. Different types and dimensions available.

Storage: store in a cool and dry place on plates in the original packing, prevent from moisture to avoid premature swelling

Supply Across India

Hydrophilic Swell Bar Supplier in Arunachal Pradesh

Maruti Rubber supplies hydrophilic swell bar for infrastructure in Arunachal Pradesh and the wider North East, where hydroelectric structures, tunnels, bridges and water-retaining works face heavy rainfall, high water heads and demanding site logistics. A hydrophilic swell bar seals construction joints by expanding on contact with water, and its controlled, repeatable swelling suits joints that may alternate between wet and dry conditions.

Our portfolio in the state includes the Dibang project in Lower Dibang Valley. For remote North East sites we plan quantities and packing with your team in advance so material reaches site in usable lengths, with data sheets for your consultant.

Also supplied in Arunachal Pradesh: Geocomposite.

Maruti Techno Rubber Pvt. Ltd. has manufactured waterproofing, rubber and geosynthetic products since 1982 under ISO 9001:2015 and ISO 14001:2015 certified systems. See our projects across India, or request a quote and our technical team will reply with specifications and pricing.

Downloads

Hydrophilic Swell Bar — Technical Datasheet PDF · Click to download
FAQs

Frequently Asked Questions

What is a hydrophilic swell bar?

A hydrophilic swell bar is a waterstop strip made from a water-absorbing polymer that is cast into concrete construction joints. On contact with water it expands, 300–700% in volume for Maruti's grades, sealing voids and cracks in the joint to stop leakage.

Does a hydrophilic swell bar work if the joint dries out?

Yes. The swelling is reversible: the bar shrinks when it dries and swells again when water returns, so it keeps sealing through wet and dry cycles.

Is Maruti's hydrophilic swell bar approved for metro projects?

Yes. Maruti's hydrophilic swell bar has a DMRC approval, and the company introduced the product in 2008. Approval documents are available on our Quality & Policies page.

Do you supply hydrophilic swell bar in Arunachal Pradesh?

Yes. Maruti Rubber supplies hydrophilic swell bar to projects in Arunachal Pradesh and the North East, including hydroelectric and tunnel works. Request a quote and we will plan quantities and dispatch with you.

Hydrophilic swell bar or PVC water stop: which should I use?

A PVC water stop is cast across the joint and is preferred for expansion joints and high-movement joints. A hydrophilic swell bar is quicker to install on construction joints and seals by swelling. Many designers use both together for critical structures.

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