Product Description

Product Features

1. 1.Hydrophobic MDI‑based polyurethane, no water absorption, no shrinkage.
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3. 2.One-component package. Reacts with water to form impermeable urethane.
   Does not corrode or damage RC structures and steel bars.
   
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5. 3.Excellent toughness; safe for use in potable water contact areas.
   
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7. 4.Suitable for one-component injection equipment.
   

Curing Characteristics

1. 1.The mixing ratio of SC-3398 with water and temperature greatly affect gel time and strength.
   Water volume is proportional to gel time.
   A simple test before use is recommended for optimal performance.
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3. 2.The cured expanded material resists weak acids and alkalis, and is compatible with asphalt joint materials, concrete, etc.
   
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5. 3.When SC-3398 PU waterstop is used below groundwater level, excessive water may cause oversaturation and poor sealing.
   After the first injection and foaming, inject 2–3 more times to fill voids in the foam.
   

Application Scope

Product Properties

1. 1.Reacts chemically and expands immediately upon contact with water or moisture in air.
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3. 2.High expansion ratio, high hardness, low toughness.
   
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5. 3.Strong adhesion to substrates; good chemical resistance (potable water, seawater, wastewater, diluted acidic/alkaline chemicals).
   
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7. 4.No dry shrinkage.
   
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9. 5.Non-toxic after full reaction.
   

Construction Method

I. Structural Crack Leakage Treatment

1. 1.Drill 45° inclined holes 5–10 cm to the left or right of the lowest point of the construction joint, to 2/3 of the structural thickness.
   Drill from low to high. Recommended hole spacing: 15–30 cm.
   Install injection packers all at once after drilling to the highest point.
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3. 2.After installing packers, use a Gaya injection machine to inject waterstop from bottom to top until the material overflows from the structural surface, then proceed to other packers.
   
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5. 3.One hour after water stopping, cut off the injection packers.
   If any material inside is not fully foamed, wait until complete curing, then fill the hole with sealant.