Krytonite™ Swelling Waterstop

(Construction Joints & Details)
Product Code: K-325-Y-5


Krytonite Swelling Waterstop is a synthetic rubber waterstop specially designed for waterproofing construction joints and penetrations in concrete construction. Krytonite Swelling Waterstop swells up to 1000% of its original volume to seal the construction joint and stop water. Suitable for use with regular ground water as well as salt and sulfate contaminated water, Krytonite is extremely durable and will not deteriorate over time, even when subjected to repeated wetting and drying cycles. Krytonite is fully compatible with Kryton’s Krystol Internal Membrane (KIM) Admixture and is a part of the Krystol Waterstop System.



Use Krytonite Swelling Waterstop to permanently waterproof horizontal or vertical construction joints, pipe penetrations, between precast elements and other concrete joints. Not for use at expansion joints. Suitable for use in sewage and containment structures. May be used in areas with chloride or sulfate contaminated soils and in contact with sea water. Use in conjunction with Krystol Waterstop Treatment or as a replacement for bentonite strips.


Physical Properties  
Appearence Yellow, trapezoid, flexible rubber strip
Dimensions 5 x 20mm (approximately .2” x .8”)
Density 1.2 – 1.25 g/cm
Hardness (Shore A) 24 +/- 3
Tensile Strength >3 MPa
Performance Properties  
Swelling Performance – Clean Water ≥1000%
Swelling Performance – Concrete Water (high pH) ≥ 800%
Swelling Performance – Salt Water (3%) ≥ 300%
Water Pressure Resistance (Modified Din 1048-5) ≥0.8 MPa



Before using this product, refer to Application Instruction 4.15 – Waterproofing Construction Joints (Dual Protection – Internal Swelling Method) or AI 4.16 – Waterproofing Horizontal & Vertical Construction Joints (Triple Protection Method) for detailed application instructions.

Basic Application Procedure: Using Krytonite Adhesive, or other approved fastening device, adhere Krytonite Swelling Waterstop at or near the center of the construction joint to clean dry concrete surface. For added long-term protection of the outboard reinforcing steel, apply Krystol Waterstop Treatment to the concrete surface first and adhere Krytonite to the treatment when it is dry. Strip-ends should be tightly butted and not overlapped. Avoid rain or immersion in water as this may cause premature swelling. If premature swelling occurs, dry the Krytonite sufficiently to restore its original dimensions and ensure material is properly affixed to the surface before pouring concrete.


Minimum joint cross section is 200 mm (8 in.). Minimum concrete strength is 27.5 MPa (3000 PSI). Apply in dry conditions and keep dry. Do not place near edge. Leave a minimum of 75 mm (3 in.) of concrete cover.


Read the Safety Data Sheet (SDS) before using this product. For professional use only.


50 m (164 ft.) per box; 5 rolls @ 10 m (32.8 ft.) Up to 60 boxes per pallet.


Krytonite Swelling Waterstop should be stored under cover, clear of the ground. Protect the materials from all sources of moisture and frost. Shelf life is 2 years.


Kryton International Inc. (Kryton) warrants that Kryton products are free from manufacturing defects and comply with the specifications given in their respective technical data sheet. Because conditions of use, such as site conditions, surface preparations, workmanship, concrete ingredients, weather, structural issues and other factors are beyond the control of Kryton, no warranty can be given as to the results of use. Purchaser agrees to seek the advice of qualified professionals and to determine for themselves the suitability of the products for their intended purpose and assumes all risks. Purchaser’s sole remedy is limited to replacement of any product proven defective or at Kryton’s option refund of the purchase price paid. THIS LIMITED WARRANTY CONTAINS THE ENTIRE OBLIGATION OF KRYTON. NO OTHER WARRANTIES, EXPRESS OR IMPLIED, SHALL APPLY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. KRYTON SHALL NOT BE LIABLE UNDER ANY LEGAL THEORY FOR SPECIAL OR CONSEQUENTIAL DAMAGES. No representative of Kryton has the authority to make any representations or provision except as stated herein. Kryton reserves the right to change the properties of its products without notice.